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Created November 3, 2012 00:53
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gistfile1.php
<?php
// $Id$
/**
* @defgroup forms Form builder functions
* @{
* Functions that build an abstract representation of a HTML form.
*
* All modules should declare their form builder functions to be in this
* group and each builder function should reference its validate and submit
* functions using \@see. Conversely, validate and submit functions should
* reference the form builder function using \@see. For examples, of this see
* system_modules_uninstall() or user_pass(), the latter of which has the
* following in its doxygen documentation:
*
* \@ingroup forms
* \@see user_pass_validate().
* \@see user_pass_submit().
*
* @} End of "defgroup forms".
*/
/**
* @defgroup form_api Form generation
* @{
* Functions to enable the processing and display of HTML forms.
*
* Drupal uses these functions to achieve consistency in its form processing and
* presentation, while simplifying code and reducing the amount of HTML that
* must be explicitly generated by modules.
*
* The primary function used with forms is drupal_get_form(), which is
* used for forms presented interactively to a user. Forms can also be built and
* submitted programmatically without any user input using the
* drupal_form_submit() function.
*
* drupal_get_form() handles retrieving, processing, and displaying a rendered
* HTML form for modules automatically.
*
* Here is an example of how to use drupal_get_form() and a form builder
* function:
* @code
* $form = drupal_get_form('my_module_example_form');
* ...
* function my_module_example_form($form, &$form_state) {
* $form['submit'] = array(
* '#type' => 'submit',
* '#value' => t('Submit'),
* );
* return $form;
* }
* function my_module_example_form_validate($form, &$form_state) {
* // Validation logic.
* }
* function my_module_example_form_submit($form, &$form_state) {
* // Submission logic.
* }
* @endcode
*
* Or with any number of additional arguments:
* @code
* $extra = "extra";
* $form = drupal_get_form('my_module_example_form', $extra);
* ...
* function my_module_example_form($form, &$form_state, $extra) {
* $form['submit'] = array(
* '#type' => 'submit',
* '#value' => $extra,
* );
* return $form;
* }
* @endcode
*
* The $form argument to form-related functions is a structured array containing
* the elements and properties of the form. For information on the array
* components and format, and more detailed explanations of the Form API
* workflow, see the
* @link http://api.drupal.org/api/drupal/developer--topics--forms_api_reference.html Form API reference @endlink
* and the
* @link http://drupal.org/node/37775 Form API section of the handbook. @endlink
* In addition, there is a set of Form API tutorials in
* @link form_example_tutorial.inc the Form Example Tutorial @endlink which
* provide basics all the way up through multistep forms.
*
* In the form builder, validation, submission, and other form functions,
* $form_state is the primary influence on the processing of the form and is
* passed by reference to most functions, so they use it to communicate with
* the form system and each other.
*
* The $form_state keys are:
* - 'values': An associative array of values submitted to the form. The
* validation functions and submit functions use this array for nearly all
* their decision making. (Note that
* @link http://api.drupal.org/api/drupal/developer--topics--forms_api_reference.html/7#tree #tree @endlink
* determines whether the values are a flat array or an array whose structure
* parallels the $form array.)
* - 'rebuild': If the submit function sets $form_state['rebuild'] to TRUE,
* submission is not completed and instead the form is rebuilt using any
* information that the submit function has made available to the form builder
* function via $form_state. This is commonly used for wizard-style
* multi-step forms, add-more buttons, and the like. For further information
* see drupal_build_form().
* - 'redirect': a URL that will be used to redirect the form on submission.
* See drupal_redirect_form() for complete information.
* - 'storage': $form_state['storage'] is not a special key, and no specific
* support is provided for it in the Form API, but by tradition it was
* the location where application-specific data was stored for communication
* between the submit, validation, and form builder functions, especially
* in a multi-step-style form. Form implementations may use any key(s) within
* $form_state (other than the keys listed here and other reserved ones used
* by Form API internals) for this kind of storage. The recommended way to
* ensure that the chosen key doesn't conflict with ones used by the Form API
* or other modules is to use the module name as the key name or a prefix for
* the key name. For example, the Node module uses $form_state['node'] in node
* editing forms to store information about the node being edited, and this
* information stays available across successive clicks of the "Preview"
* button as well as when the "Save" button is finally clicked.
* - 'temporary': Since values for all non-reserved keys in $form_state persist
* throughout a multistep form sequence, the Form API provides the 'temporary'
* key for modules to use for communicating information across form-related
* functions during a single page request only. There is no use-case for this
* functionality in core.
* - 'triggering_element': (read-only) The form element that triggered
* submission. This is the same as the deprecated
* $form_state['clicked_button']. It is the element that caused submission,
* which may or may not be a button (in the case of AJAX forms.) This is
* often used to distinguish between various buttons in a submit handler,
* and is also used in AJAX handlers.
* - 'cache': The typical form workflow involves two page requests. During the
* first page request, a form is built and returned for the user to fill in.
* Then the user fills the form in and submits it, triggering a second page
* request in which the form must be built and processed. By default, $form
* and $form_state are built from scratch during each of these page requests.
* In some special use-cases, it is necessary or desired to persist the $form
* and $form_state variables from the initial page request to the one that
* processes the submission. A form builder function can set 'cache' to TRUE
* to do this. One example where this is needed is to handle AJAX submissions,
* so ajax_process_form() sets this for all forms that include an element with
* a #ajax property. (In AJAX, the handler has no way to build the form
* itself, so must rely on the cached version created on each page load, so
* it's a classic example of this use case.) Note that the persistence of
* $form and $form_state across successive submissions of a multi-step form
* happens automatically regardless of the value for 'cache'.
* - 'input': The array of values as they were submitted by the user. These are
* raw and unvalidated, so should not be used without a thorough understanding
* of security implications. In almost all cases, code should use the data in
* the 'values' array exclusively. The most common use of this key is for
* multi-step forms that need to clear some of the user input when setting
* 'rebuild'.
*/
/**
* Wrapper for drupal_build_form() for use when $form_state is not needed.
*
* @param $form_id
* The unique string identifying the desired form. If a function with that
* name exists, it is called to build the form array. Modules that need to
* generate the same form (or very similar forms) using different $form_ids
* can implement hook_forms(), which maps different $form_id values to the
* proper form constructor function. Examples may be found in node_forms(),
* search_forms(), and user_forms().
* @param ...
* Any additional arguments are passed on to the functions called by
* drupal_get_form(), including the unique form constructor function. For
* example, the node_edit form requires that a node object is passed in here
* when it is called.
*
* @return
* The form array.
*
* @see drupal_build_form()
*/
function drupal_get_form($form_id) {
$form_state = array();
$args = func_get_args();
// Remove $form_id from the arguments.
array_shift($args);
$form_state['build_info']['args'] = $args;
return drupal_build_form($form_id, $form_state);
}
/**
* Build and process a form based on a form id.
*
* The form may also be retrieved from the cache if the form was built in a
* previous page-load. The form is then passed on for processing, validation
* and submission if there is proper input.
*
* @param $form_id
* The unique string identifying the desired form. If a function with that
* name exists, it is called to build the form array. Modules that need to
* generate the same form (or very similar forms) using different $form_ids
* can implement hook_forms(), which maps different $form_id values to the
* proper form constructor function. Examples may be found in node_forms(),
* search_forms(), and user_forms().
* @param &$form_state
* An array which stores information about the form. This is passed as a
* reference so that the caller can use it to examine what in the form changed
* when the form submission process is complete. Furthermore, it may be used
* to store information related to the processed data in the form, which will
* persist across page requests when the 'cache' or 'rebuild' flag is set.
* The following parameters may be set in $form_state to affect how the form
* is rendered:
* - build_info: A keyed array of build information that is necessary to
* rebuild the form from cache when the original context may no longer be
* available:
* - args: An array of arguments to pass to the form builder.
* - files: An optional array defining include files that need to be loaded
* for building the form. Each array entry may be the path to a file or
* another array containing values for the parameters 'type', 'module' and
* 'name' as needed by module_load_include(). The files listed here are
* automatically loaded by form_get_cache(). Defaults to the current menu
* router item's 'file' definition, if existent.
* - rebuild: Normally, after the entire form processing is completed and
* submit handlers ran, a form is considered to be done and
* drupal_redirect_form() will redirect the user to a new page using a GET
* request (so a browser refresh does not re-submit the form). However, if
* 'rebuild' has been set to TRUE, then a new copy of the form is
* immediately built and sent to the browser; instead of a redirect. This is
* used for multi-step forms, such as wizards and confirmation forms.
* Normally, $form_state['rebuild'] is set by a submit handler, since it is
* usually logic within a submit handler that determines whether a form is
* done or requires another step. However, a validation handler may already
* set $form_state['rebuild'] to cause the form processing to bypass submit
* handlers and rebuild the form instead, even if there are no validation
* errors.
* - input: An array of input that corresponds to $_POST or $_GET, depending
* on the 'method' chosen (see below).
* - method: The HTTP form method to use for finding the input for this form.
* May be 'post' or 'get'. Defaults to 'post'. Note that 'get' method
* forms do not use form ids so are always considered to be submitted, which
* can have unexpected effects. The 'get' method should only be used on
* forms that do not change data, as that is exclusively the domain of post.
* - no_redirect: If set to TRUE the form will NOT perform a drupal_goto(),
* even if 'redirect' is set.
* - cache: If set to TRUE the original, unprocessed form structure will be
* cached, which allows to rebuild the entire form from cache.
* - no_cache: If set to TRUE the form will NOT be cached, even if 'cache' is
* set.
* - always_process: If TRUE and the method is GET, a form_id is not
* necessary. This should only be used on RESTful GET forms that do NOT
* write data, as this could lead to security issues. It is useful so that
* searches do not need to have a form_id in their query arguments to
* trigger the search.
* - must_validate: Ordinarily, a form is only validated once but there are
* times when a form is resubmitted internally and should be validated
* again. Setting this to TRUE will force that to happen. This is most
* likely to occur during AHAH or AJAX operations.
* - temporary: An array holding temporary data accessible during the current
* page request only. It may be used to temporary save any data that doesn't
* need to or shouldn't be cached during the whole form workflow, e.g. data
* that needs to be accessed during the current form build process only.
* - wrapper_callback: Modules that wish to pre-populate certain forms with
* common elements, such as back/next/save buttons in multi-step form
* wizards, may define a form builder function name that returns a form
* structure, which is passed on to the actual form builder function.
* Such implementations may either define the 'wrapper_callback' via
* hook_forms() or have to invoke drupal_build_form() (instead of
* drupal_get_form()) on their own in a custom menu callback to prepare
* $form_state accordingly.
* Further $form_state properties controlling the redirection behavior after
* form submission may be found in drupal_redirect_form().
*
* @return
* The rendered form or NULL, depending upon the $form_state flags that were set.
*
* @see drupal_redirect_form()
*/
function drupal_build_form($form_id, &$form_state) {
// Ensure some defaults; if already set they will not be overridden.
$form_state += form_state_defaults();
if (!isset($form_state['input'])) {
$form_state['input'] = $form_state['method'] == 'get' ? $_GET : $_POST;
}
if (isset($_SESSION['batch_form_state'])) {
// We've been redirected here after a batch processing. The form has
// already been processed, but needs to be rebuilt. See _batch_finished().
$form_state = $_SESSION['batch_form_state'];
unset($_SESSION['batch_form_state']);
return drupal_rebuild_form($form_id, $form_state);
}
// If the incoming input contains a form_build_id, we'll check the cache for a
// copy of the form in question. If it's there, we don't have to rebuild the
// form to proceed. In addition, if there is stored form_state data from a
// previous step, we'll retrieve it so it can be passed on to the form
// processing code.
$check_cache = isset($form_state['input']['form_id']) && $form_state['input']['form_id'] == $form_id && !empty($form_state['input']['form_build_id']);
if ($check_cache) {
$form = form_get_cache($form_state['input']['form_build_id'], $form_state);
}
// If the previous bit of code didn't result in a populated $form object, we
// are hitting the form for the first time and we need to build it from
// scratch.
if (!isset($form)) {
// If we attempted to serve the form from cache, uncacheable $form_state
// keys need to be removed after retrieving and preparing the form, except
// any that were already set prior to retrieving the form.
if ($check_cache) {
$form_state_before_retrieval = $form_state;
}
$form = drupal_retrieve_form($form_id, $form_state);
drupal_prepare_form($form_id, $form, $form_state);
// form_set_cache() removes uncacheable $form_state keys defined in
// form_state_keys_no_cache() in order for multi-step forms to work
// properly. This means that form processing logic for single-step forms
// using $form_state['cache'] may depend on data stored in those keys
// during drupal_retrieve_form()/drupal_prepare_form(), but form
// processing should not depend on whether the form is cached or not, so
// $form_state is adjusted to match what it would be after a
// form_set_cache()/form_get_cache() sequence. These exceptions are
// allowed to survive here:
// - always_process: Does not make sense in conjunction with form caching
// in the first place, since passing form_build_id as a GET parameter is
// not desired.
// - temporary: Any assigned data is expected to survives within the same
// page request.
if ($check_cache) {
$uncacheable_keys = array_flip(array_diff(form_state_keys_no_cache(), array('always_process', 'temporary')));
$form_state = array_diff_key($form_state, $uncacheable_keys);
$form_state += $form_state_before_retrieval;
}
}
// Now that we have a constructed form, process it. This is where:
// - Element #process functions get called to further refine $form.
// - User input, if any, gets incorporated in the #value property of the
// corresponding elements and into $form_state['values'].
// - Validation and submission handlers are called.
// - If this submission is part of a multistep workflow, the form is rebuilt
// to contain the information of the next step.
// - If necessary, the form and form state are cached or re-cached, so that
// appropriate information persists to the next page request.
// All of the handlers in the pipeline receive $form_state by reference and
// can use it to know or update information about the state of the form.
drupal_process_form($form_id, $form, $form_state);
// If this was a successful submission of a single-step form or the last step
// of a multi-step form, then drupal_process_form() issued a redirect to
// another page, or back to this page, but as a new request. Therefore, if
// we're here, it means that this is either a form being viewed initially
// before any user input, or there was a validation error requiring the form
// to be re-displayed, or we're in a multi-step workflow and need to display
// the form's next step. In any case, we have what we need in $form, and can
// return it for rendering.
return $form;
}
/**
* Retrieve default values for the $form_state array.
*/
function form_state_defaults() {
return array(
'rebuild' => FALSE,
'rebuild_info' => array(),
'redirect' => NULL,
'build_info' => array('args' => array()),
'temporary' => array(),
'submitted' => FALSE,
'executed' => FALSE,
'programmed' => FALSE,
'cache'=> FALSE,
'method' => 'post',
'groups' => array(),
'buttons' => array(),
);
}
/**
* Constructs a new $form from the information in $form_state.
*
* This is the key function for making multi-step forms advance from step to
* step. It is called by drupal_process_form() when all user input processing,
* including calling validation and submission handlers, for the request is
* finished. If a validate or submit handler set $form_state['rebuild'] to TRUE,
* and if other conditions don't preempt a rebuild from happening, then this
* function is called to generate a new $form, the next step in the form
* workflow, to be returned for rendering.
*
* AJAX form submissions are almost always multi-step workflows, so that is one
* common use-case during which form rebuilding occurs. See ajax_form_callback()
* for more information about creating AJAX-enabled forms.
*
* @param $form_id
* The unique string identifying the desired form. If a function
* with that name exists, it is called to build the form array.
* Modules that need to generate the same form (or very similar forms)
* using different $form_ids can implement hook_forms(), which maps
* different $form_id values to the proper form constructor function. Examples
* may be found in node_forms(), search_forms(), and user_forms().
* @param $form_state
* A keyed array containing the current state of the form.
* @param $old_form
* (optional) A previously built $form. Used to retain the #build_id and
* #action properties in AJAX callbacks and similar partial form rebuilds. The
* only properties copied from $old_form are the ones which both exist in
* $old_form and for which $form_state['rebuild_info']['copy'][PROPERTY] is
* TRUE. If $old_form is not passed, the entire $form is rebuilt freshly.
* 'rebuild_info' needs to be a separate top-level property next to
* 'build_info', since the contained data must not be cached.
*
* @return
* The newly built form.
*
* @see drupal_process_form()
* @see ajax_form_callback()
*/
function drupal_rebuild_form($form_id, &$form_state, $old_form = NULL) {
$form = drupal_retrieve_form($form_id, $form_state);
// If only parts of the form will be returned to the browser (e.g. AJAX or
// RIA clients), re-use the old #build_id to not require client-side code to
// manually update the hidden 'build_id' input element.
// Otherwise, a new #build_id is generated, to not clobber the previous
// build's data in the form cache; also allowing the user to go back to an
// earlier build, make changes, and re-submit.
// @see drupal_prepare_form()
if (isset($old_form['#build_id']) && !empty($form_state['rebuild_info']['copy']['#build_id'])) {
$form['#build_id'] = $old_form['#build_id'];
}
else {
$form['#build_id'] = 'form-' . drupal_hash_base64(uniqid(mt_rand(), TRUE) . mt_rand());
}
// #action defaults to request_uri(), but in case of AJAX and other partial
// rebuilds, the form is submitted to an alternate URL, and the original
// #action needs to be retained.
if (isset($old_form['#action']) && !empty($form_state['rebuild_info']['copy']['#action'])) {
$form['#action'] = $old_form['#action'];
}
drupal_prepare_form($form_id, $form, $form_state);
// Caching is normally done in drupal_process_form(), but what needs to be
// cached is the $form structure before it passes through form_builder(),
// so we need to do it here.
// @todo For Drupal 8, find a way to avoid this code duplication.
if (empty($form_state['no_cache'])) {
form_set_cache($form['#build_id'], $form, $form_state);
}
// Clear out all group associations as these might be different when
// re-rendering the form.
$form_state['groups'] = array();
// Return a fully built form that is ready for rendering.
return form_builder($form_id, $form, $form_state);
}
/**
* Fetch a form from cache.
*/
function form_get_cache($form_build_id, &$form_state) {
if ($cached = cache_get('form_' . $form_build_id, 'cache_form')) {
$form = $cached->data;
global $user;
if ((isset($form['#cache_token']) && drupal_valid_token($form['#cache_token'])) || (!isset($form['#cache_token']) && !$user->uid)) {
if ($cached = cache_get('form_state_' . $form_build_id, 'cache_form')) {
// Re-populate $form_state for subsequent rebuilds.
$form_state = $cached->data + $form_state;
// If the original form is contained in include files, load the files.
// See drupal_build_form().
$form_state['build_info'] += array('files' => array());
foreach ($form_state['build_info']['files'] as $file) {
if (is_array($file)) {
$file += array('type' => 'inc', 'name' => $file['module']);
module_load_include($file['type'], $file['module'], $file['name']);
}
elseif (file_exists($file)) {
require_once DRUPAL_ROOT . '/' . $file;
}
}
}
return $form;
}
}
}
/**
* Store a form in the cache.
*/
function form_set_cache($form_build_id, $form, $form_state) {
// 6 hours cache life time for forms should be plenty.
$expire = 21600;
// Cache form structure.
if (isset($form)) {
if ($GLOBALS['user']->uid) {
$form['#cache_token'] = drupal_get_token();
}
cache_set('form_' . $form_build_id, $form, 'cache_form', REQUEST_TIME + $expire);
}
// Cache form state.
if ($data = array_diff_key($form_state, array_flip(form_state_keys_no_cache()))) {
cache_set('form_state_' . $form_build_id, $data, 'cache_form', REQUEST_TIME + $expire);
}
}
/**
* Returns an array of $form_state keys that shouldn't be cached.
*/
function form_state_keys_no_cache() {
return array(
// Public properties defined by form constructors and form handlers.
'always_process',
'must_validate',
'rebuild',
'rebuild_info',
'redirect',
'no_redirect',
'temporary',
// Internal properties defined by form processing.
'buttons',
'triggering_element',
'clicked_button',
'complete form',
'groups',
'input',
'method',
'submit_handlers',
'submitted',
'executed',
'validate_handlers',
'values',
);
}
/**
* Retrieves, populates, and processes a form.
*
* This function allows you to supply values for form elements and submit a
* form for processing. Compare to drupal_get_form(), which also builds and
* processes a form, but does not allow you to supply values.
*
* There is no return value, but you can check to see if there are errors
* by calling form_get_errors().
*
* @param $form_id
* The unique string identifying the desired form. If a function
* with that name exists, it is called to build the form array.
* Modules that need to generate the same form (or very similar forms)
* using different $form_ids can implement hook_forms(), which maps
* different $form_id values to the proper form constructor function. Examples
* may be found in node_forms(), search_forms(), and user_forms().
* @param $form_state
* A keyed array containing the current state of the form. Most important is
* the $form_state['values'] collection, a tree of data used to simulate the
* incoming $_POST information from a user's form submission. If a key is not
* filled in $form_state['values'], then the default value of the respective
* element is used. To submit an unchecked checkbox or other control that
* browsers submit by not having a $_POST entry, include the key, but set the
* value to NULL.
* @param ...
* Any additional arguments are passed on to the functions called by
* drupal_form_submit(), including the unique form constructor function.
* For example, the node_edit form requires that a node object be passed
* in here when it is called. Arguments that need to be passed by reference
* should not be included here, but rather placed directly in the $form_state
* build info array so that the reference can be preserved. For example, a
* form builder function with the following signature:
* @code
* function mymodule_form($form, &$form_state, &$object) {
* }
* @endcode
* would be called via drupal_form_submit() as follows:
* @code
* $form_state['values'] = $my_form_values;
* $form_state['build_info']['args'] = array(&$object);
* drupal_form_submit('mymodule_form', $form_state);
* @endcode
* For example:
* @code
* // register a new user
* $form_state = array();
* $form_state['values']['name'] = 'robo-user';
* $form_state['values']['mail'] = '[email protected]';
* $form_state['values']['pass']['pass1'] = 'password';
* $form_state['values']['pass']['pass2'] = 'password';
* $form_state['values']['op'] = t('Create new account');
* drupal_form_submit('user_register_form', $form_state);
* @endcode
*/
function drupal_form_submit($form_id, &$form_state) {
if (!isset($form_state['build_info']['args'])) {
$args = func_get_args();
array_shift($args);
array_shift($args);
$form_state['build_info']['args'] = $args;
}
// Merge in default values.
$form_state += form_state_defaults();
$form = drupal_retrieve_form($form_id, $form_state);
$form_state['input'] = $form_state['values'];
$form_state['programmed'] = TRUE;
// Programmed forms are always submitted.
$form_state['submitted'] = TRUE;
// Reset form validation.
$form_state['must_validate'] = TRUE;
form_clear_error();
drupal_prepare_form($form_id, $form, $form_state);
drupal_process_form($form_id, $form, $form_state);
}
/**
* Retrieves the structured array that defines a given form.
*
* @param $form_id
* The unique string identifying the desired form. If a function
* with that name exists, it is called to build the form array.
* Modules that need to generate the same form (or very similar forms)
* using different $form_ids can implement hook_forms(), which maps
* different $form_id values to the proper form constructor function.
* @param $form_state
* A keyed array containing the current state of the form, including the
* additional arguments to drupal_get_form() or drupal_form_submit() in the
* 'args' component of the array.
*/
function drupal_retrieve_form($form_id, &$form_state) {
$forms = &drupal_static(__FUNCTION__);
// Record the filepath of the include file containing the original form, so
// the form builder callbacks can be loaded when the form is being rebuilt
// from cache on a different path (such as 'system/ajax'). See
// form_get_cache().
// $menu_get_item() is not available at installation time.
if (!isset($form_state['build_info']['files']['menu']) && !defined('MAINTENANCE_MODE')) {
$item = menu_get_item();
if (!empty($item['include_file'])) {
$form_state['build_info']['files']['menu'] = $item['include_file'];
}
}
// We save two copies of the incoming arguments: one for modules to use
// when mapping form ids to constructor functions, and another to pass to
// the constructor function itself.
$args = $form_state['build_info']['args'];
// We first check to see if there's a function named after the $form_id.
// If there is, we simply pass the arguments on to it to get the form.
if (!function_exists($form_id)) {
// In cases where many form_ids need to share a central constructor function,
// such as the node editing form, modules can implement hook_forms(). It
// maps one or more form_ids to the correct constructor functions.
//
// We cache the results of that hook to save time, but that only works
// for modules that know all their form_ids in advance. (A module that
// adds a small 'rate this comment' form to each comment in a list
// would need a unique form_id for each one, for example.)
//
// So, we call the hook if $forms isn't yet populated, OR if it doesn't
// yet have an entry for the requested form_id.
if (!isset($forms) || !isset($forms[$form_id])) {
$forms = module_invoke_all('forms', $form_id, $args);
}
$form_definition = $forms[$form_id];
if (isset($form_definition['callback arguments'])) {
$args = array_merge($form_definition['callback arguments'], $args);
}
if (isset($form_definition['callback'])) {
$callback = $form_definition['callback'];
$form_state['build_info']['base_form_id'] = $callback;
}
// In case $form_state['wrapper_callback'] is not defined already, we also
// allow hook_forms() to define one.
if (!isset($form_state['wrapper_callback']) && isset($form_definition['wrapper_callback'])) {
$form_state['wrapper_callback'] = $form_definition['wrapper_callback'];
}
}
$form = array();
// We need to pass $form_state by reference in order for forms to modify it,
// since call_user_func_array() requires that referenced variables are passed
// explicitly.
$args = array_merge(array($form, &$form_state), $args);
// When the passed $form_state (not using drupal_get_form()) defines a
// 'wrapper_callback', then it requests to invoke a separate (wrapping) form
// builder function to pre-populate the $form array with form elements, which
// the actual form builder function ($callback) expects. This allows for
// pre-populating a form with common elements for certain forms, such as
// back/next/save buttons in multi-step form wizards. See drupal_build_form().
if (isset($form_state['wrapper_callback']) && function_exists($form_state['wrapper_callback'])) {
$form = call_user_func_array($form_state['wrapper_callback'], $args);
// Put the prepopulated $form into $args.
$args[0] = $form;
}
// If $callback was returned by a hook_forms() implementation, call it.
// Otherwise, call the function named after the form id.
$form = call_user_func_array(isset($callback) ? $callback : $form_id, $args);
$form['#form_id'] = $form_id;
return $form;
}
/**
* Processes a form submission.
*
* This function is the heart of form API. The form gets built, validated and in
* appropriate cases, submitted and rebuilt.
*
* @param $form_id
* The unique string identifying the current form.
* @param $form
* An associative array containing the structure of the form.
* @param $form_state
* A keyed array containing the current state of the form. This
* includes the current persistent storage data for the form, and
* any data passed along by earlier steps when displaying a
* multi-step form. Additional information, like the sanitized $_POST
* data, is also accumulated here.
*/
function drupal_process_form($form_id, &$form, &$form_state) {
$form_state['values'] = array();
// With $_GET, these forms are always submitted if requested.
if ($form_state['method'] == 'get' && !empty($form_state['always_process'])) {
if (!isset($form_state['input']['form_build_id'])) {
$form_state['input']['form_build_id'] = $form['#build_id'];
}
if (!isset($form_state['input']['form_id'])) {
$form_state['input']['form_id'] = $form_id;
}
if (!isset($form_state['input']['form_token']) && isset($form['#token'])) {
$form_state['input']['form_token'] = drupal_get_token($form['#token']);
}
}
// form_builder() finishes building the form by calling element #process
// functions and mapping user input, if any, to #value properties, and also
// storing the values in $form_state['values']. We need to retain the
// unprocessed $form in case it needs to be cached.
$unprocessed_form = $form;
$form = form_builder($form_id, $form, $form_state);
// Only process the input if we have a correct form submission.
if ($form_state['process_input']) {
drupal_validate_form($form_id, $form, $form_state);
// drupal_html_id() maintains a cache of element IDs it has seen,
// so it can prevent duplicates. We want to be sure we reset that
// cache when a form is processed, so scenarios that result in
// the form being built behind the scenes and again for the
// browser don't increment all the element IDs needlessly.
drupal_static_reset('drupal_html_id');
if ($form_state['submitted'] && !form_get_errors() && !$form_state['rebuild']) {
// Execute form submit handlers.
form_execute_handlers('submit', $form, $form_state);
// We'll clear out the cached copies of the form and its stored data
// here, as we've finished with them. The in-memory copies are still
// here, though.
if (!variable_get('cache', 0) && !empty($form_state['values']['form_build_id'])) {
cache_clear_all('form_' . $form_state['values']['form_build_id'], 'cache_form');
cache_clear_all('form_state_' . $form_state['values']['form_build_id'], 'cache_form');
}
// If batches were set in the submit handlers, we process them now,
// possibly ending execution. We make sure we do not react to the batch
// that is already being processed (if a batch operation performs a
// drupal_form_submit).
if ($batch =& batch_get() && !isset($batch['current_set'])) {
// Store $form_state information in the batch definition.
// We need the full $form_state when either:
// - Some submit handlers were saved to be called during batch
// processing. See form_execute_handlers().
// - The form is multistep.
// In other cases, we only need the information expected by
// drupal_redirect_form().
if ($batch['has_form_submits'] || !empty($form_state['rebuild'])) {
$batch['form_state'] = $form_state;
}
else {
$batch['form_state'] = array_intersect_key($form_state, array_flip(array('programmed', 'rebuild', 'storage', 'no_redirect', 'redirect')));
}
$batch['progressive'] = !$form_state['programmed'];
batch_process();
// Execution continues only for programmatic forms.
// For 'regular' forms, we get redirected to the batch processing
// page. Form redirection will be handled in _batch_finished(),
// after the batch is processed.
}
// Set a flag to indicate the the form has been processed and executed.
$form_state['executed'] = TRUE;
// Redirect the form based on values in $form_state.
drupal_redirect_form($form_state);
}
// Don't rebuild or cache form submissions invoked via drupal_form_submit().
if (!empty($form_state['programmed'])) {
return;
}
// If $form_state['rebuild'] has been set and input has been processed
// without validation errors, we are in a multi-step workflow that is not
// yet complete. A new $form needs to be constructed based on the changes
// made to $form_state during this request. Normally, a submit handler sets
// $form_state['rebuild'] if a fully executed form requires another step.
// However, for forms that have not been fully executed (e.g., AJAX
// submissions triggered by non-buttons), there is no submit handler to set
// $form_state['rebuild']. It would not make sense to redisplay the
// identical form without an error for the user to correct, so we also
// rebuild error-free non-executed forms, regardless of
// $form_state['rebuild'].
// @todo D8: Simplify this logic; considering AJAX and non-HTML front-ends,
// along with element-level #submit properties, it makes no sense to have
// divergent form execution based on whether the triggering element has
// #executes_submit_callback set to TRUE.
if (($form_state['rebuild'] || !$form_state['executed']) && !form_get_errors()) {
// Form building functions (e.g., _form_builder_handle_input_element())
// may use $form_state['rebuild'] to determine if they are running in the
// context of a rebuild, so ensure it is set.
$form_state['rebuild'] = TRUE;
$form = drupal_rebuild_form($form_id, $form_state, $form);
}
}
// After processing the form, the form builder or a #process callback may
// have set $form_state['cache'] to indicate that the form and form state
// shall be cached. But the form may only be cached if the 'no_cache' property
// is not set to TRUE. Only cache $form as it was prior to form_builder(),
// because form_builder() must run for each request to accomodate new user
// input. Rebuilt forms are not cached here, because drupal_rebuild_form()
// already takes care of that.
if (!$form_state['rebuild'] && $form_state['cache'] && empty($form_state['no_cache'])) {
form_set_cache($form['#build_id'], $unprocessed_form, $form_state);
}
}
/**
* Prepares a structured form array by adding required elements,
* executing any hook_form_alter functions, and optionally inserting
* a validation token to prevent tampering.
*
* @param $form_id
* A unique string identifying the form for validation, submission,
* theming, and hook_form_alter functions.
* @param $form
* An associative array containing the structure of the form.
* @param $form_state
* A keyed array containing the current state of the form. Passed
* in here so that hook_form_alter() calls can use it, as well.
*/
function drupal_prepare_form($form_id, &$form, &$form_state) {
global $user;
$form['#type'] = 'form';
$form_state['programmed'] = isset($form_state['programmed']) ? $form_state['programmed'] : FALSE;
// Fix the form method, if it is 'get' in $form_state, but not in $form.
if ($form_state['method'] == 'get' && !isset($form['#method'])) {
$form['#method'] = 'get';
}
// Generate a new #build_id for this form, if none has been set already. The
// form_build_id is used as key to cache a particular build of the form. For
// multi-step forms, this allows the user to go back to an earlier build, make
// changes, and re-submit.
// @see drupal_build_form()
// @see drupal_rebuild_form()
if (!isset($form['#build_id'])) {
$form['#build_id'] = 'form-' . drupal_hash_base64(uniqid(mt_rand(), TRUE) . mt_rand());
}
$form['form_build_id'] = array(
'#type' => 'hidden',
'#value' => $form['#build_id'],
'#id' => $form['#build_id'],
'#name' => 'form_build_id',
);
// Add a token, based on either #token or form_id, to any form displayed to
// authenticated users. This ensures that any submitted form was actually
// requested previously by the user and protects against cross site request
// forgeries.
// This does not apply to programmatically submitted forms. Furthermore, since
// tokens are session-bound and forms displayed to anonymous users are very
// likely cached, we cannot assign a token for them.
// During installation, there is no $user yet.
if (!empty($user->uid) && !$form_state['programmed']) {
// Form constructors may explicitly set #token to FALSE when cross site
// request forgery is irrelevant to the form, such as search forms.
if (isset($form['#token']) && $form['#token'] === FALSE) {
unset($form['#token']);
}
// Otherwise, generate a public token based on the form id.
else {
$form['#token'] = $form_id;
$form['form_token'] = array(
'#id' => drupal_html_id('edit-' . $form_id . '-form-token'),
'#type' => 'token',
'#default_value' => drupal_get_token($form['#token']),
);
}
}
if (isset($form_id)) {
$form['form_id'] = array(
'#type' => 'hidden',
'#value' => $form_id,
'#id' => drupal_html_id("edit-$form_id"),
);
}
if (!isset($form['#id'])) {
$form['#id'] = drupal_html_id($form_id);
}
$form += element_info('form');
$form += array('#tree' => FALSE, '#parents' => array());
if (!isset($form['#validate'])) {
// Check for a handler specific to $form_id.
if (function_exists($form_id . '_validate')) {
$form['#validate'][] = $form_id . '_validate';
}
// Otherwise check whether this is a shared form and whether there is a
// handler for the shared $form_id.
elseif (isset($form_state['build_info']['base_form_id']) && function_exists($form_state['build_info']['base_form_id'] . '_validate')) {
$form['#validate'][] = $form_state['build_info']['base_form_id'] . '_validate';
}
}
if (!isset($form['#submit'])) {
// Check for a handler specific to $form_id.
if (function_exists($form_id . '_submit')) {
$form['#submit'][] = $form_id . '_submit';
}
// Otherwise check whether this is a shared form and whether there is a
// handler for the shared $form_id.
elseif (isset($form_state['build_info']['base_form_id']) && function_exists($form_state['build_info']['base_form_id'] . '_submit')) {
$form['#submit'][] = $form_state['build_info']['base_form_id'] . '_submit';
}
}
// If no #theme has been set, automatically apply theme suggestions.
// theme_form() itself is in #theme_wrappers and not #theme. Therefore, the
// #theme function only has to care for rendering the inner form elements,
// not the form itself.
if (!isset($form['#theme'])) {
$form['#theme'] = array($form_id);
if (isset($form_state['build_info']['base_form_id'])) {
$form['#theme'][] = $form_state['build_info']['base_form_id'];
}
}
// Invoke hook_form_alter(), hook_form_BASE_FORM_ID_alter(), and
// hook_form_FORM_ID_alter() implementations.
$hooks = array('form');
if (isset($form_state['build_info']['base_form_id'])) {
$hooks[] = 'form_' . $form_state['build_info']['base_form_id'];
}
$hooks[] = 'form_' . $form_id;
drupal_alter($hooks, $form, $form_state, $form_id);
}
/**
* Validates user-submitted form data from the $form_state using
* the validate functions defined in a structured form array.
*
* @param $form_id
* A unique string identifying the form for validation, submission,
* theming, and hook_form_alter functions.
* @param $form
* An associative array containing the structure of the form, which is passed
* by reference. Form validation handlers are able to alter the form structure
* (like #process and #after_build callbacks during form building) in case of
* a validation error. If a validation handler alters the form structure, it
* is responsible for validating the values of changed form elements in
* $form_state['values'] to prevent form submit handlers from receiving
* unvalidated values.
* @param $form_state
* A keyed array containing the current state of the form. The current
* user-submitted data is stored in $form_state['values'], though
* form validation functions are passed an explicit copy of the
* values for the sake of simplicity. Validation handlers can also
* $form_state to pass information on to submit handlers. For example:
* $form_state['data_for_submission'] = $data;
* This technique is useful when validation requires file parsing,
* web service requests, or other expensive requests that should
* not be repeated in the submission step.
*/
function drupal_validate_form($form_id, &$form, &$form_state) {
$validated_forms = &drupal_static(__FUNCTION__, array());
if (isset($validated_forms[$form_id]) && empty($form_state['must_validate'])) {
return;
}
// If the session token was set by drupal_prepare_form(), ensure that it
// matches the current user's session.
if (isset($form['#token'])) {
if (!drupal_valid_token($form_state['values']['form_token'], $form['#token'])) {
// Setting this error will cause the form to fail validation.
form_set_error('form_token', t('This form is outdated. Reload the page and try again. Contact the site administrator if the problem persists.'));
}
}
_form_validate($form, $form_state, $form_id);
$validated_forms[$form_id] = TRUE;
// If validation errors are limited then remove any non validated form values,
// so that only values that passed validation are left for submit callbacks.
if (isset($form_state['triggering_element']['#limit_validation_errors']) && $form_state['triggering_element']['#limit_validation_errors'] !== FALSE) {
$values = array();
foreach ($form_state['triggering_element']['#limit_validation_errors'] as $section) {
// If the section exists within $form_state['values'], even if the value
// is NULL, copy it to $values.
$section_exists = NULL;
$value = drupal_array_get_nested_value($form_state['values'], $section, $section_exists);
if ($section_exists) {
drupal_array_set_nested_value($values, $section, $value);
}
}
// For convenience we always make the value of the pressed button available.
if (isset($form_state['triggering_element']['#button_type'])) {
$values[$form_state['triggering_element']['#name']] = $form_state['triggering_element']['#value'];
drupal_array_set_nested_value($values, $form_state['triggering_element']['#parents'], $form_state['triggering_element']['#value']);
}
$form_state['values'] = $values;
}
}
/**
* Redirects the user to a URL after a form has been processed.
*
* After a form was executed, the data in $form_state controls whether the form
* is redirected. By default, we redirect to a new destination page. The path of
* the destination page can be set in $form_state['redirect']. If that is not
* set, the user is redirected to the current page to display a fresh,
* unpopulated copy of the form.
*
* There are several triggers that may prevent a redirection though:
* - If $form_state['redirect'] is FALSE, a form builder function or form
* validation/submit handler does not want a user to be redirected, which
* means that drupal_goto() is not invoked. For most forms, the redirection
* logic will be the same regardless of whether $form_state['redirect'] is
* undefined or FALSE. However, in case it was not defined and the current
* request contains a 'destination' query string, drupal_goto() will redirect
* to that given destination instead. Only setting $form_state['redirect'] to
* FALSE will prevent any redirection.
* - If $form_state['no_redirect'] is TRUE, then the callback that originally
* built the form explicitly disallows any redirection, regardless of the
* redirection value in $form_state['redirect']. For example, ajax_get_form()
* defines $form_state['no_redirect'] when building a form in an AJAX
* callback to prevent any redirection. $form_state['no_redirect'] should NOT
* be altered by form builder functions or form validation/submit handlers.
* - If $form_state['programmed'] is TRUE, the form submission was usually
* invoked via drupal_form_submit(), so any redirection would break the script
* that invoked drupal_form_submit().
* - If $form_state['rebuild'] is TRUE, the form needs to be rebuilt without
* redirection.
*
* @param $form_state
* A keyed array containing the current state of the form.
*
* @see drupal_process_form()
* @see drupal_build_form()
*/
function drupal_redirect_form($form_state) {
// Skip redirection for form submissions invoked via drupal_form_submit().
if (!empty($form_state['programmed'])) {
return;
}
// Skip redirection if rebuild is activated.
if (!empty($form_state['rebuild'])) {
return;
}
// Skip redirection if it was explicitly disallowed.
if (!empty($form_state['no_redirect'])) {
return;
}
// Only invoke drupal_goto() if redirect value was not set to FALSE.
if (!isset($form_state['redirect']) || $form_state['redirect'] !== FALSE) {
if (isset($form_state['redirect'])) {
if (is_array($form_state['redirect'])) {
call_user_func_array('drupal_goto', $form_state['redirect']);
}
else {
// This function can be called from the installer, which guarantees
// that $redirect will always be a string, so catch that case here
// and use the appropriate redirect function.
$function = drupal_installation_attempted() ? 'install_goto' : 'drupal_goto';
$function($form_state['redirect']);
}
}
drupal_goto($_GET['q']);
}
}
/**
* Performs validation on form elements. First ensures required fields are
* completed, #maxlength is not exceeded, and selected options were in the
* list of options given to the user. Then calls user-defined validators.
*
* @param $elements
* An associative array containing the structure of the form.
* @param $form_state
* A keyed array containing the current state of the form. The current
* user-submitted data is stored in $form_state['values'], though
* form validation functions are passed an explicit copy of the
* values for the sake of simplicity. Validation handlers can also
* $form_state to pass information on to submit handlers. For example:
* $form_state['data_for_submission'] = $data;
* This technique is useful when validation requires file parsing,
* web service requests, or other expensive requests that should
* not be repeated in the submission step.
* @param $form_id
* A unique string identifying the form for validation, submission,
* theming, and hook_form_alter functions.
*/
function _form_validate(&$elements, &$form_state, $form_id = NULL) {
// Also used in the installer, pre-database setup.
$t = get_t();
// Recurse through all children.
foreach (element_children($elements) as $key) {
if (isset($elements[$key]) && $elements[$key]) {
_form_validate($elements[$key], $form_state);
}
}
// Validate the current input.
if (!isset($elements['#validated']) || !$elements['#validated']) {
// The following errors are always shown.
if (isset($elements['#needs_validation'])) {
// Verify that the value is not longer than #maxlength.
if (isset($elements['#maxlength']) && drupal_strlen($elements['#value']) > $elements['#maxlength']) {
form_error($elements, $t('!name cannot be longer than %max characters but is currently %length characters long.', array('!name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title'], '%max' => $elements['#maxlength'], '%length' => drupal_strlen($elements['#value']))));
}
if (isset($elements['#options']) && isset($elements['#value'])) {
if ($elements['#type'] == 'select') {
$options = form_options_flatten($elements['#options']);
}
else {
$options = $elements['#options'];
}
if (is_array($elements['#value'])) {
$value = $elements['#type'] == 'checkboxes' ? array_keys($elements['#value']) : $elements['#value'];
foreach ($value as $v) {
if (!isset($options[$v])) {
form_error($elements, $t('An illegal choice has been detected. Please contact the site administrator.'));
watchdog('form', 'Illegal choice %choice in !name element.', array('%choice' => $v, '!name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title']), WATCHDOG_ERROR);
}
}
}
// Non-multiple select fields always have a value in HTML. If the user
// does not change the form, it will be the value of the first option.
// Because of this, form validation for the field will almost always
// pass, even if the user did not select anything. To work around this
// browser behavior, required select fields without a #default_value get
// an additional, first empty option. In case the submitted value is
// identical to the empty option's value, we reset the element's value
// to NULL to trigger the regular #required handling below.
// @see form_process_select()
elseif ($elements['#type'] == 'select' && !$elements['#multiple'] && $elements['#required'] && !isset($elements['#default_value']) && $elements['#value'] === $elements['#empty_value']) {
$elements['#value'] = NULL;
form_set_value($elements, NULL, $form_state);
}
elseif (!isset($options[$elements['#value']])) {
form_error($elements, $t('An illegal choice has been detected. Please contact the site administrator.'));
watchdog('form', 'Illegal choice %choice in %name element.', array('%choice' => $elements['#value'], '%name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title']), WATCHDOG_ERROR);
}
}
}
// While this element is being validated, it may be desired that some calls
// to form_set_error() be suppressed and not result in a form error, so
// that a button that implements low-risk functionality (such as "Previous"
// or "Add more") that doesn't require all user input to be valid can still
// have its submit handlers triggered. The triggering element's
// #limit_validation_errors property contains the information for which
// errors are needed, and all other errors are to be suppressed. The
// #limit_validation_errors property is ignored if submit handlers will run,
// but the element doesn't have a #submit property, because it's too large a
// security risk to have any invalid user input when executing form-level
// submit handlers.
if (isset($form_state['triggering_element']['#limit_validation_errors']) && ($form_state['triggering_element']['#limit_validation_errors'] !== FALSE) && !($form_state['submitted'] && !isset($form_state['triggering_element']['#submit']))) {
form_set_error(NULL, '', $form_state['triggering_element']['#limit_validation_errors']);
}
// If submit handlers won't run (due to the submission having been triggered
// by an element whose #executes_submit_callback property isn't TRUE), then
// it's safe to suppress all validation errors, and we do so by default,
// which is particularly useful during an AJAX submission triggered by a
// non-button. An element can override this default by setting the
// #limit_validation_errors property. For button element types,
// #limit_validation_errors defaults to FALSE (via system_element_info()),
// so that full validation is their default behavior.
elseif (isset($form_state['triggering_element']) && !isset($form_state['triggering_element']['#limit_validation_errors']) && !$form_state['submitted']) {
form_set_error(NULL, '', array());
}
// As an extra security measure, explicitly turn off error suppression if
// one of the above conditions wasn't met. Since this is also done at the
// end of this function, doing it here is only to handle the rare edge case
// where a validate handler invokes form processing of another form.
else {
drupal_static_reset('form_set_error:limit_validation_errors');
}
// Make sure a value is passed when the field is required.
if (isset($elements['#needs_validation']) && $elements['#required']) {
// A simple call to empty() will not cut it here as some fields, like
// checkboxes, can return a valid value of '0'. Instead, check the
// length if it's a string, and the item count if it's an array.
// An unchecked checkbox has a #value of integer 0, different than string
// '0', which could be a valid value.
$is_empty_multiple = (!count($elements['#value']));
$is_empty_string = (is_string($elements['#value']) && drupal_strlen(trim($elements['#value'])) == 0);
$is_empty_value = ($elements['#value'] === 0);
if ($is_empty_multiple || $is_empty_string || $is_empty_value) {
// Although discouraged, a #title is not mandatory for form elements. In
// case there is no #title, we cannot set a form error message.
// Instead of setting no #title, form constructors are encouraged to set
// #title_display to 'invisible' to improve accessibility.
if (isset($elements['#title'])) {
form_error($elements, $t('!name field is required.', array('!name' => $elements['#title'])));
}
else {
form_error($elements);
}
}
}
// Call user-defined form level validators.
if (isset($form_id)) {
form_execute_handlers('validate', $elements, $form_state);
}
// Call any element-specific validators. These must act on the element
// #value data.
elseif (isset($elements['#element_validate'])) {
foreach ($elements['#element_validate'] as $function) {
$function($elements, $form_state, $form_state['complete form']);
}
}
$elements['#validated'] = TRUE;
}
// Done validating this element, so turn off error suppression.
// _form_validate() turns it on again when starting on the next element, if
// it's still appropriate to do so.
drupal_static_reset('form_set_error:limit_validation_errors');
}
/**
* A helper function used to execute custom validation and submission
* handlers for a given form. Button-specific handlers are checked
* first. If none exist, the function falls back to form-level handlers.
*
* @param $type
* The type of handler to execute. 'validate' or 'submit' are the
* defaults used by Form API.
* @param $form
* An associative array containing the structure of the form.
* @param $form_state
* A keyed array containing the current state of the form. If the user
* submitted the form by clicking a button with custom handler functions
* defined, those handlers will be stored here.
*/
function form_execute_handlers($type, &$form, &$form_state) {
$return = FALSE;
// If there was a button pressed, use its handlers.
if (isset($form_state[$type . '_handlers'])) {
$handlers = $form_state[$type . '_handlers'];
}
// Otherwise, check for a form-level handler.
elseif (isset($form['#' . $type])) {
$handlers = $form['#' . $type];
}
else {
$handlers = array();
}
foreach ($handlers as $function) {
// Check if a previous _submit handler has set a batch, but make sure we
// do not react to a batch that is already being processed (for instance
// if a batch operation performs a drupal_form_submit()).
if ($type == 'submit' && ($batch =& batch_get()) && !isset($batch['id'])) {
// Some previous submit handler has set a batch. To ensure correct
// execution order, store the call in a special 'control' batch set.
// See _batch_next_set().
$batch['sets'][] = array('form_submit' => $function);
$batch['has_form_submits'] = TRUE;
}
else {
$function($form, $form_state);
}
$return = TRUE;
}
return $return;
}
/**
* Files an error against a form element.
*
* When a validation error is detected, the validator calls form_set_error() to
* indicate which element needs to be changed and provide an error message. This
* causes the Form API to not execute the form submit handlers, and instead to
* re-display the form to the user with the corresponding elements rendered with
* an 'error' CSS class (shown as red by default).
*
* The standard form_set_error() behavior can be changed if a button provides
* the #limit_validation_errors property. Multistep forms not wanting to
* validate the whole form can set #limit_validation_errors on buttons to
* limit validation errors to only certain elements. For example, pressing the
* "Previous" button in a multistep form should not fire validation errors just
* because the current step has invalid values. If #limit_validation_errors is
* set on a clicked button, the button must also define a #submit property
* (may be set to an empty array). Any #submit handlers will be executed even if
* there is invalid input, so extreme care should be taken with respect to any
* actions taken by them. This is typically not a problem with buttons like
* "Previous" or "Add more" that do not invoke persistent storage of the
* submitted form values. Do not use the #limit_validation_errors property on
* buttons that trigger saving of form values to the database.
*
* The #limit_validation_errors property is a list of "sections" within
* $form_state['values'] that must contain valid values. Each "section" is an
* array with the ordered set of keys needed to reach that part of
* $form_state['values'] (i.e., the #parents property of the element).
*
* Example 1: Allow the "Previous" button to function, regardless of whether any
* user input is valid.
*
* @code
* $form['actions']['previous'] = array(
* '#type' => 'submit',
* '#value' => t('Previous'),
* '#limit_validation_errors' => array(), // No validation.
* '#submit' => array('some_submit_function'), // #submit required.
* );
* @endcode
*
* Example 2: Require some, but not all, user input to be valid to process the
* submission of a "Previous" button.
*
* @code
* $form['actions']['previous'] = array(
* '#type' => 'submit',
* '#value' => t('Previous'),
* '#limit_validation_errors' => array(
* array('step1'), // Validate $form_state['values']['step1'].
* array('foo', 'bar'), // Validate $form_state['values']['foo']['bar'].
* ),
* '#submit' => array('some_submit_function'), // #submit required.
* );
* @endcode
*
* This will require $form_state['values']['step1'] and everything within it
* (for example, $form_state['values']['step1']['choice']) to be valid, so
* calls to form_set_error('step1', $message) or
* form_set_error('step1][choice', $message) will prevent the submit handlers
* from running, and result in the error message being displayed to the user.
* However, calls to form_set_error('step2', $message) and
* form_set_error('step2][groupX][choiceY', $message) will be suppressed,
* resulting in the message not being displayed to the user, and the submit
* handlers will run despite $form_state['values']['step2'] and
* $form_state['values']['step2']['groupX']['choiceY'] containing invalid
* values. Errors for an invalid $form_state['values']['foo'] will be
* suppressed, but errors flagging invalid values for
* $form_state['values']['foo']['bar'] and everything within it will be
* flagged and submission prevented.
*
* Partial form validation is implemented by suppressing errors rather than by
* skipping the input processing and validation steps entirely, because some
* forms have button-level submit handlers that call Drupal API functions that
* assume that certain data exists within $form_state['values'], and while not
* doing anything with that data that requires it to be valid, PHP errors
* would be triggered if the input processing and validation steps were fully
* skipped.
* @see http://drupal.org/node/370537
* @see http://drupal.org/node/763376
*
* @param $name
* The name of the form element. If the #parents property of your form
* element is array('foo', 'bar', 'baz') then you may set an error on 'foo'
* or 'foo][bar][baz'. Setting an error on 'foo' sets an error for every
* element where the #parents array starts with 'foo'.
* @param $message
* The error message to present to the user.
* @param $limit_validation_errors
* Internal use only. The #limit_validation_errors property of the clicked
* button, if it exists.
*
* @return
* Return value is for internal use only. To get a list of errors, use
* form_get_errors() or form_get_error().
*/
function form_set_error($name = NULL, $message = '', $limit_validation_errors = NULL) {
$form = &drupal_static(__FUNCTION__, array());
$sections = &drupal_static(__FUNCTION__ . ':limit_validation_errors');
if (isset($limit_validation_errors)) {
$sections = $limit_validation_errors;
}
if (isset($name) && !isset($form[$name])) {
$record = TRUE;
if (isset($sections)) {
// #limit_validation_errors is an array of "sections" within which user
// input must be valid. If the element is within one of these sections,
// the error must be recorded. Otherwise, it can be suppressed.
// #limit_validation_errors can be an empty array, in which case all
// errors are suppressed. For example, a "Previous" button might want its
// submit action to be triggered even if none of the submitted values are
// valid.
$record = FALSE;
foreach ($sections as $section) {
// Exploding by '][' reconstructs the element's #parents. If the
// reconstructed #parents begin with the same keys as the specified
// section, then the element's values are within the part of
// $form_state['values'] that the clicked button requires to be valid,
// so errors for this element must be recorded.
if (array_slice(explode('][', $name), 0, count($section)) === $section) {
$record = TRUE;
break;
}
}
}
if ($record) {
$form[$name] = $message;
if ($message) {
drupal_set_message($message, 'error');
}
}
}
return $form;
}
/**
* Clear all errors against all form elements made by form_set_error().
*/
function form_clear_error() {
drupal_static_reset('form_set_error');
}
/**
* Return an associative array of all errors.
*/
function form_get_errors() {
$form = form_set_error();
if (!empty($form)) {
return $form;
}
}
/**
* Returns the error message filed against the given form element.
*
* Form errors higher up in the form structure override deeper errors as well as
* errors on the element itself.
*/
function form_get_error($element) {
$form = form_set_error();
$parents = array();
foreach ($element['#parents'] as $parent) {
$parents[] = $parent;
$key = implode('][', $parents);
if (isset($form[$key])) {
return $form[$key];
}
}
}
/**
* Flag an element as having an error.
*/
function form_error(&$element, $message = '') {
form_set_error(implode('][', $element['#parents']), $message);
}
/**
* Walk through the structured form array, adding any required properties to
* each element and mapping the incoming input data to the proper elements.
* Also, execute any #process handlers attached to a specific element.
*
* This is one of the three primary functions that recursively iterates a form
* array. This one does it for completing the form building process. The other
* two are _form_validate() (invoked via drupal_validate_form() and used to
* invoke validation logic for each element) and drupal_render() (for rendering
* each element). Each of these three pipelines provides ample opportunity for
* modules to customize what happens. For example, during this function's life
* cycle, the following functions get called for each element:
* - $element['#value_callback']: A function that implements how user input is
* mapped to an element's #value property. This defaults to a function named
* 'form_type_TYPE_value' where TYPE is $element['#type'].
* - $element['#process']: An array of functions called after user input has
* been mapped to the element's #value property. These functions can be used
* to dynamically add child elements: for example, for the 'date' element
* type, one of the functions in this array is form_process_date(), which adds
* the individual 'year', 'month', 'day', etc. child elements. These functions
* can also be used to set additional properties or implement special logic
* other than adding child elements: for example, for the 'fieldset' element
* type, one of the functions in this array is form_process_fieldset(), which
* adds the attributes and JavaScript needed to make the fieldset collapsible
* if the #collapsible property is set. The #process functions are called in
* preorder traversal, meaning they are called for the parent element first,
* then for the child elements.
* - $element['#after_build']: An array of functions called after form_builder()
* is done with its processing of the element. These are called in postorder
* traversal, meaning they are called for the child elements first, then for
* the parent element.
* There are similar properties containing callback functions invoked by
* _form_validate() and drupal_render(), appropriate for those operations.
*
* Developers are strongly encouraged to integrate the functionality needed by
* their form or module within one of these three pipelines, using the
* appropriate callback property, rather than implementing their own recursive
* traversal of a form array. This facilitates proper integration between
* multiple modules. For example, module developers are familiar with the
* relative order in which hook_form_alter() implementations and #process
* functions run. A custom traversal function that affects the building of a
* form is likely to not integrate with hook_form_alter() and #process in the
* expected way. Also, deep recursion within PHP is both slow and memory
* intensive, so it is best to minimize how often it's done.
*
* As stated above, each element's #process functions are executed after its
* #value has been set. This enables those functions to execute conditional
* logic based on the current value. However, all of form_builder() runs before
* drupal_validate_form() is called, so during #process function execution, the
* element's #value has not yet been validated, so any code that requires
* validated values must reside within a submit handler.
*
* As a security measure, user input is used for an element's #value only if the
* element exists within $form, is not disabled (as per the #disabled property),
* and can be accessed (as per the #access property, except that forms submitted
* using drupal_form_submit() bypass #access restrictions). When user input is
* ignored due to #disabled and #access restrictions, the element's default
* value is used.
*
* Because of the preorder traversal, where #process functions of an element run
* before user input for its child elements is processed, and because of the
* Form API security of user input processing with respect to #access and
* #disabled described above, this generally means that #process functions
* should not use an element's (unvalidated) #value to affect the #disabled or
* #access of child elements. Use-cases where a developer may be tempted to
* implement such conditional logic usually fall into one of two categories:
* - Where user input from the current submission must affect the structure of a
* form, including properties like #access and #disabled that affect how the
* next submission needs to be processed, a multi-step workflow is needed.
* This is most commonly implemented with a submit handler setting persistent
* data within $form_state based on *validated* values in
* $form_state['values'] and setting $form_state['rebuild']. The form building
* functions must then be implmented to use the $form_state data to rebuild
* the form with the structure appropriate for the new state.
* - Where user input must affect the rendering of the form without affecting
* its structure, the necessary conditional rendering logic should reside
* within functions that run during the rendering phase (#pre_render, #theme,
* #theme_wrappers, and #post_render).
*
* @param $form_id
* A unique string identifying the form for validation, submission,
* theming, and hook_form_alter functions.
* @param $element
* An associative array containing the structure of the current element.
* @param $form_state
* A keyed array containing the current state of the form. In this
* context, it is used to accumulate information about which button
* was clicked when the form was submitted, as well as the sanitized
* $_POST data.
*/
function form_builder($form_id, $element, &$form_state) {
// Initialize as unprocessed.
$element['#processed'] = FALSE;
// Use element defaults.
if (isset($element['#type']) && empty($element['#defaults_loaded']) && ($info = element_info($element['#type']))) {
// Overlay $info onto $element, retaining preexisting keys in $element.
$element += $info;
$element['#defaults_loaded'] = TRUE;
}
// Assign basic defaults common for all form elements.
$element += array(
'#required' => FALSE,
'#attributes' => array(),
'#title_display' => 'before',
);
// Special handling if we're on the top level form element.
if (isset($element['#type']) && $element['#type'] == 'form') {
if (!empty($element['#https']) && variable_get('https', FALSE) &&
!url_is_external($element['#action'])) {
global $base_root;
// Not an external URL so ensure that it is secure.
$element['#action'] = str_replace('http://', 'https://', $base_root) . $element['#action'];
}
// Store a complete copy of the form in form_state prior to building the form.
$form_state['complete form'] = $element;
// Set a flag if we have a correct form submission. This is always TRUE for
// programmed forms coming from drupal_form_submit(), or if the form_id coming
// from the POST data is set and matches the current form_id.
if ($form_state['programmed'] || (!empty($form_state['input']) && (isset($form_state['input']['form_id']) && ($form_state['input']['form_id'] == $form_id)))) {
$form_state['process_input'] = TRUE;
}
else {
$form_state['process_input'] = FALSE;
}
}
if (!isset($element['#id'])) {
$element['#id'] = drupal_html_id('edit-' . implode('-', $element['#parents']));
}
// Handle input elements.
if (!empty($element['#input'])) {
_form_builder_handle_input_element($form_id, $element, $form_state);
}
// Allow for elements to expand to multiple elements, e.g., radios,
// checkboxes and files.
if (isset($element['#process']) && !$element['#processed']) {
foreach ($element['#process'] as $process) {
$element = $process($element, $form_state, $form_state['complete form']);
}
$element['#processed'] = TRUE;
}
// We start off assuming all form elements are in the correct order.
$element['#sorted'] = TRUE;
// Recurse through all child elements.
$count = 0;
foreach (element_children($element) as $key) {
// Prior to checking properties of child elements, their default properties
// need to be loaded.
if (isset($element[$key]['#type']) && empty($element[$key]['#defaults_loaded']) && ($info = element_info($element[$key]['#type']))) {
$element[$key] += $info;
$element[$key]['#defaults_loaded'] = TRUE;
}
// Don't squash an existing tree value.
if (!isset($element[$key]['#tree'])) {
$element[$key]['#tree'] = $element['#tree'];
}
// Deny access to child elements if parent is denied.
if (isset($element['#access']) && !$element['#access']) {
$element[$key]['#access'] = FALSE;
}
// Make child elements inherit their parent's #disabled and #allow_focus
// values unless they specify their own.
foreach (array('#disabled', '#allow_focus') as $property) {
if (isset($element[$property]) && !isset($element[$key][$property])) {
$element[$key][$property] = $element[$property];
}
}
// Don't squash existing parents value.
if (!isset($element[$key]['#parents'])) {
// Check to see if a tree of child elements is present. If so,
// continue down the tree if required.
$element[$key]['#parents'] = $element[$key]['#tree'] && $element['#tree'] ? array_merge($element['#parents'], array($key)) : array($key);
}
// Ensure #array_parents follows the actual form structure.
$array_parents = isset($element['#array_parents']) ? $element['#array_parents'] : array();
$array_parents[] = $key;
$element[$key]['#array_parents'] = $array_parents;
// Assign a decimal placeholder weight to preserve original array order.
if (!isset($element[$key]['#weight'])) {
$element[$key]['#weight'] = $count/1000;
}
else {
// If one of the child elements has a weight then we will need to sort
// later.
unset($element['#sorted']);
}
$element[$key] = form_builder($form_id, $element[$key], $form_state);
$count++;
}
// The #after_build flag allows any piece of a form to be altered
// after normal input parsing has been completed.
if (isset($element['#after_build']) && !isset($element['#after_build_done'])) {
foreach ($element['#after_build'] as $function) {
$element = $function($element, $form_state);
}
$element['#after_build_done'] = TRUE;
}
// If there is a file element, we need to flip a flag so later the
// form encoding can be set.
if (isset($element['#type']) && $element['#type'] == 'file') {
$form_state['has_file_element'] = TRUE;
}
// Final tasks for the form element after form_builder() has run for all other
// elements.
if (isset($element['#type']) && $element['#type'] == 'form') {
// If there is a file element, we set the form encoding.
if (isset($form_state['has_file_element'])) {
$element['#attributes']['enctype'] = 'multipart/form-data';
}
// If a form contains a single textfield, and the ENTER key is pressed
// within it, Internet Explorer submits the form with no POST data
// identifying any submit button. Other browsers submit POST data as though
// the user clicked the first button. Therefore, to be as consistent as we
// can be across browsers, if no 'triggering_element' has been identified
// yet, default it to the first button.
if (!$form_state['programmed'] && !isset($form_state['triggering_element']) && !empty($form_state['buttons'])) {
$form_state['triggering_element'] = $form_state['buttons'][0];
}
// If the triggering element specifies "button-level" validation and submit
// handlers to run instead of the default form-level ones, then add those to
// the form state.
foreach (array('validate', 'submit') as $type) {
if (isset($form_state['triggering_element']['#' . $type])) {
$form_state[$type . '_handlers'] = $form_state['triggering_element']['#' . $type];
}
}
// If the triggering element executes submit handlers, then set the form
// state key that's needed for those handlers to run.
if (!empty($form_state['triggering_element']['#executes_submit_callback'])) {
$form_state['submitted'] = TRUE;
}
// Special processing if the triggering element is a button.
if (isset($form_state['triggering_element']['#button_type'])) {
// Because there are several ways in which the triggering element could
// have been determined (including from input variables set by JavaScript
// or fallback behavior implemented for IE), and because buttons often
// have their #name property not derived from their #parents property, we
// can't assume that input processing that's happened up until here has
// resulted in $form_state['values'][BUTTON_NAME] being set. But it's
// common for forms to have several buttons named 'op' and switch on
// $form_state['values']['op'] during submit handler execution.
$form_state['values'][$form_state['triggering_element']['#name']] = $form_state['triggering_element']['#value'];
// @todo Legacy support. Remove in Drupal 8.
$form_state['clicked_button'] = $form_state['triggering_element'];
}
// Update the copy of the complete form for usage in validation handlers.
$form_state['complete form'] = $element;
}
return $element;
}
/**
* Populate the #value and #name properties of input elements so they
* can be processed and rendered.
*/
function _form_builder_handle_input_element($form_id, &$element, &$form_state) {
if (!isset($element['#name'])) {
$name = array_shift($element['#parents']);
$element['#name'] = $name;
if ($element['#type'] == 'file') {
// To make it easier to handle $_FILES in file.inc, we place all
// file fields in the 'files' array. Also, we do not support
// nested file names.
$element['#name'] = 'files[' . $element['#name'] . ']';
}
elseif (count($element['#parents'])) {
$element['#name'] .= '[' . implode('][', $element['#parents']) . ']';
}
array_unshift($element['#parents'], $name);
}
// Setting #disabled to TRUE results in user input being ignored, regardless
// of how the element is themed or whether JavaScript is used to change the
// control's attributes. However, it's good UI to let the user know that input
// is not wanted for the control. HTML supports two attributes for this:
// http://www.w3.org/TR/html401/interact/forms.html#h-17.12. If a form wants
// to start a control off with one of these attributes for UI purposes only,
// but still allow input to be processed if it's sumitted, it can set the
// desired attribute in #attributes directly rather than using #disabled.
// However, developers should think carefully about the accessibility
// implications of doing so: if the form expects input to be enterable under
// some condition triggered by JavaScript, how would someone who has
// JavaScript disabled trigger that condition? Instead, developers should
// consider whether a multi-step form would be more appropriate (#disabled can
// be changed from step to step). If one still decides to use JavaScript to
// affect when a control is enabled, then it is best for accessibility for the
// control to be enabled in the HTML, and disabled by JavaScript on document
// ready.
if (!empty($element['#disabled'])) {
if (!empty($element['#allow_focus'])) {
$element['#attributes']['readonly'] = 'readonly';
}
else {
$element['#attributes']['disabled'] = 'disabled';
}
}
// With JavaScript or other easy hacking, input can be submitted even for
// elements with #access=FALSE or #disabled=TRUE. For security, these must
// not be processed. Forms that set #disabled=TRUE on an element do not
// expect input for the element, and even forms submitted with
// drupal_form_submit() must not be able to get around this. Forms that set
// #access=FALSE on an element usually allow access for some users, so forms
// submitted with drupal_form_submit() may bypass access restriction and be
// treated as high-privelege users instead.
$process_input = empty($element['#disabled']) && ($form_state['programmed'] || ($form_state['process_input'] && (!isset($element['#access']) || $element['#access'])));
// Set the element's #value property.
if (!isset($element['#value']) && !array_key_exists('#value', $element)) {
$value_callback = !empty($element['#value_callback']) ? $element['#value_callback'] : 'form_type_' . $element['#type'] . '_value';
if ($process_input) {
// Get the input for the current element. NULL values in the input need to
// be explicitly distinguished from missing input. (see below)
$input_exists = NULL;
$input = drupal_array_get_nested_value($form_state['input'], $element['#parents'], $input_exists);
// For browser-submitted forms, the submitted values do not contain values
// for certain elements (empty multiple select, unchecked checkbox).
// During initial form processing, we add explicit NULL values for such
// elements in $form_state['input']. When rebuilding the form, we can
// distinguish elements having NULL input from elements that were not part
// of the initially submitted form and can therefore use default values
// for the latter, if required. Programmatically submitted forms can
// submit explicit NULL values when calling drupal_form_submit(), so we do
// not modify $form_state['input'] for them.
if (!$input_exists && !$form_state['rebuild'] && !$form_state['programmed']) {
// Add the necessary parent keys to $form_state['input'] and sets the
// element's input value to NULL.
drupal_array_set_nested_value($form_state['input'], $element['#parents'], NULL);
$input_exists = TRUE;
}
// If we have input for the current element, assign it to the #value
// property, optionally filtered through $value_callback.
if ($input_exists) {
if (function_exists($value_callback)) {
$element['#value'] = $value_callback($element, $input, $form_state);
}
if (!isset($element['#value']) && isset($input)) {
$element['#value'] = $input;
}
}
// Mark all posted values for validation.
if (isset($element['#value']) || (!empty($element['#required']))) {
$element['#needs_validation'] = TRUE;
}
}
// Load defaults.
if (!isset($element['#value'])) {
// Call #type_value without a second argument to request default_value handling.
if (function_exists($value_callback)) {
$element['#value'] = $value_callback($element, FALSE, $form_state);
}
// Final catch. If we haven't set a value yet, use the explicit default value.
// Avoid image buttons (which come with garbage value), so we only get value
// for the button actually clicked.
if (!isset($element['#value']) && empty($element['#has_garbage_value'])) {
$element['#value'] = isset($element['#default_value']) ? $element['#default_value'] : '';
}
}
}
// Determine which element (if any) triggered the submission of the form and
// keep track of all the clickable buttons in the form for
// form_state_values_clean(). Enforce the same input processing restrictions
// as above.
if ($process_input) {
// Detect if the element triggered the submission via AJAX.
if (_form_element_triggered_scripted_submission($element, $form_state)) {
$form_state['triggering_element'] = $element;
}
// If the form was submitted by the browser rather than via AJAX, then it
// can only have been triggered by a button, and we need to determine which
// button within the constraints of how browsers provide this information.
if (isset($element['#button_type'])) {
// All buttons in the form need to be tracked for
// form_state_values_clean() and for the form_builder() code that handles
// a form submission containing no button information in $_POST.
$form_state['buttons'][] = $element;
if (_form_button_was_clicked($element, $form_state)) {
$form_state['triggering_element'] = $element;
}
}
}
// Set the element's value in $form_state['values'], but only, if its key
// does not exist yet (a #value_callback may have already populated it).
if (!drupal_array_nested_key_exists($form_state['values'], $element['#parents'])) {
form_set_value($element, $element['#value'], $form_state);
}
}
/**
* Helper function to handle the convoluted logic of button click detection.
*
* This detects button or non-button controls that trigger a form submission via
* AJAX or some other scriptable environment. These environments can set the
* special input key '_triggering_element_name' to identify the triggering
* element. If the name alone doesn't identify the element uniquely, the input
* key '_triggering_element_value' may also be set to require a match on element
* value. An example where this is needed is if there are several buttons all
* named 'op', and only differing in their value.
*/
function _form_element_triggered_scripted_submission($element, &$form_state) {
if (!empty($form_state['input']['_triggering_element_name']) && $element['#name'] == $form_state['input']['_triggering_element_name']) {
if (empty($form_state['input']['_triggering_element_value']) || $form_state['input']['_triggering_element_value'] == $element['#value']) {
return TRUE;
}
}
return FALSE;
}
/**
* Helper function to handle the convoluted logic of button click detection.
*
* This detects button controls that trigger a form submission by being clicked
* and having the click processed by the browser rather than being captured by
* JavaScript. Essentially, it detects if the button's name and value are part
* of the POST data, but with extra code to deal with the convoluted way in
* which browsers submit data for image button clicks.
*
* This does not detect button clicks processed by AJAX (that is done in
* _form_element_triggered_scripted_submission()) and it does not detect form
* submissions from Internet Explorer in response to an ENTER key pressed in a
* textfield (form_builder() has extra code for that).
*
* Because this function contains only part of the logic needed to determine
* $form_state['triggering_element'], it should not be called from anywhere
* other than within the Form API. Form validation and submit handlers needing
* to know which button was clicked should get that information from
* $form_state['triggering_element'].
*/
function _form_button_was_clicked($element, &$form_state) {
// First detect normal 'vanilla' button clicks. Traditionally, all
// standard buttons on a form share the same name (usually 'op'),
// and the specific return value is used to determine which was
// clicked. This ONLY works as long as $form['#name'] puts the
// value at the top level of the tree of $_POST data.
if (isset($form_state['input'][$element['#name']]) && $form_state['input'][$element['#name']] == $element['#value']) {
return TRUE;
}
// When image buttons are clicked, browsers do NOT pass the form element
// value in $_POST. Instead they pass an integer representing the
// coordinates of the click on the button image. This means that image
// buttons MUST have unique $form['#name'] values, but the details of
// their $_POST data should be ignored.
elseif (!empty($element['#has_garbage_value']) && isset($element['#value']) && $element['#value'] !== '') {
return TRUE;
}
return FALSE;
}
/**
* Removes internal Form API elements and buttons from submitted form values.
*
* This function can be used when a module wants to store all submitted form
* values, for example, by serializing them into a single database column. In
* such cases, all internal Form API values and all form button elements should
* not be contained, and this function allows to remove them before the module
* proceeds to storage. Next to button elements, the following internal values
* are removed:
* - form_id
* - form_token
* - form_build_id
* - op
*
* @param &$form_state
* A keyed array containing the current state of the form, including
* submitted form values; altered by reference.
*/
function form_state_values_clean(&$form_state) {
// Remove internal Form API values.
unset($form_state['values']['form_id'], $form_state['values']['form_token'], $form_state['values']['form_build_id'], $form_state['values']['op']);
// Remove button values.
// form_builder() collects all button elements in a form. We remove the button
// value separately for each button element.
foreach ($form_state['buttons'] as $button) {
// Remove this button's value from the submitted form values by finding
// the value corresponding to this button.
// We iterate over the #parents of this button and move a reference to
// each parent in $form_state['values']. For example, if #parents is:
// array('foo', 'bar', 'baz')
// then the corresponding $form_state['values'] part will look like this:
// array(
// 'foo' => array(
// 'bar' => array(
// 'baz' => 'button_value',
// ),
// ),
// )
// We start by (re)moving 'baz' to $last_parent, so we are able unset it
// at the end of the iteration. Initially, $values will contain a
// reference to $form_state['values'], but in the iteration we move the
// reference to $form_state['values']['foo'], and finally to
// $form_state['values']['foo']['bar'], which is the level where we can
// unset 'baz' (that is stored in $last_parent).
$parents = $button['#parents'];
$values = &$form_state['values'];
$last_parent = array_pop($parents);
foreach ($parents as $parent) {
$values = &$values[$parent];
}
unset($values[$last_parent]);
}
}
/**
* Helper function to determine the value for an image button form element.
*
* @param $form
* The form element whose value is being populated.
* @param $input
* The incoming input to populate the form element. If this is FALSE,
* the element's default value should be returned.
* @param $form_state
* A keyed array containing the current state of the form.
* @return
* The data that will appear in the $form_state['values'] collection
* for this element. Return nothing to use the default.
*/
function form_type_image_button_value($form, $input, $form_state) {
if ($input !== FALSE) {
if (!empty($input)) {
// If we're dealing with Mozilla or Opera, we're lucky. It will
// return a proper value, and we can get on with things.
return $form['#return_value'];
}
else {
// Unfortunately, in IE we never get back a proper value for THIS
// form element. Instead, we get back two split values: one for the
// X and one for the Y coordinates on which the user clicked the
// button. We'll find this element in the #post data, and search
// in the same spot for its name, with '_x'.
$input = $form_state['input'];
foreach (explode('[', $form['#name']) as $element_name) {
// chop off the ] that may exist.
if (substr($element_name, -1) == ']') {
$element_name = substr($element_name, 0, -1);
}
if (!isset($input[$element_name])) {
if (isset($input[$element_name . '_x'])) {
return $form['#return_value'];
}
return NULL;
}
$input = $input[$element_name];
}
return $form['#return_value'];
}
}
}
/**
* Helper function to determine the value for a checkbox form element.
*
* @param $form
* The form element whose value is being populated.
* @param $input
* The incoming input to populate the form element. If this is FALSE,
* the element's default value should be returned.
* @return
* The data that will appear in the $element_state['values'] collection
* for this element. Return nothing to use the default.
*/
function form_type_checkbox_value($element, $input = FALSE) {
if ($input !== FALSE) {
// Successful (checked) checkboxes are present with a value (possibly '0').
// http://www.w3.org/TR/html401/interact/forms.html#successful-controls
// For an unchecked checkbox, we return integer 0, so we can explicitly
// test for a value different than string '0'.
return isset($input) ? $element['#return_value'] : 0;
}
}
/**
* Helper function to determine the value for a checkboxes form element.
*
* @param $element
* The form element whose value is being populated.
* @param $input
* The incoming input to populate the form element. If this is FALSE,
* the element's default value should be returned.
* @return
* The data that will appear in the $element_state['values'] collection
* for this element. Return nothing to use the default.
*/
function form_type_checkboxes_value($element, $input = FALSE) {
if ($input === FALSE) {
$value = array();
$element += array('#default_value' => array());
foreach ($element['#default_value'] as $key) {
$value[$key] = $key;
}
return $value;
}
elseif (is_array($input)) {
// Programmatic form submissions use NULL to indicate that a checkbox
// should be unchecked; see drupal_form_submit(). We therefore remove all
// NULL elements from the array before constructing the return value, to
// simulate the behavior of web browsers (which do not send unchecked
// checkboxes to the server at all). This will not affect non-programmatic
// form submissions, since a checkbox can never legitimately be NULL.
foreach ($input as $key => $value) {
if (!isset($value)) {
unset($input[$key]);
}
}
return drupal_map_assoc($input);
}
else {
return array();
}
}
/**
* Helper function to determine the value for a password_confirm form
* element.
*
* @param $element
* The form element whose value is being populated.
* @param $input
* The incoming input to populate the form element. If this is FALSE,
* the element's default value should be returned.
* @return
* The data that will appear in the $element_state['values'] collection
* for this element. Return nothing to use the default.
*/
function form_type_password_confirm_value($element, $input = FALSE) {
if ($input === FALSE) {
$element += array('#default_value' => array());
return $element['#default_value'] + array('pass1' => '', 'pass2' => '');
}
}
/**
* Helper function to determine the value for a select form element.
*
* @param $element
* The form element whose value is being populated.
* @param $input
* The incoming input to populate the form element. If this is FALSE,
* the element's default value should be returned.
* @return
* The data that will appear in the $element_state['values'] collection
* for this element. Return nothing to use the default.
*/
function form_type_select_value($element, $input = FALSE) {
if ($input !== FALSE) {
if (isset($element['#multiple']) && $element['#multiple']) {
// If an enabled multi-select submits NULL, it means all items are
// unselected. A disabled multi-select always submits NULL, and the
// default value should be used.
if (empty($element['#disabled'])) {
return (is_array($input)) ? drupal_map_assoc($input) : array();
}
else {
return (isset($element['#default_value']) && is_array($element['#default_value'])) ? $element['#default_value'] : array();
}
}
// Non-multiple select elements may have an empty option preprended to them
// (see form_process_select()). When this occurs, usually #empty_value is
// an empty string, but some forms set #empty_value to integer 0 or some
// other non-string constant. PHP receives all submitted form input as
// strings, but if the empty option is selected, set the value to match the
// empty value exactly.
elseif (isset($element['#empty_value']) && $input === (string) $element['#empty_value']) {
return $element['#empty_value'];
}
else {
return $input;
}
}
}
/**
* Helper function to determine the value for a textfield form element.
*
* @param $element
* The form element whose value is being populated.
* @param $input
* The incoming input to populate the form element. If this is FALSE,
* the element's default value should be returned.
* @return
* The data that will appear in the $element_state['values'] collection
* for this element. Return nothing to use the default.
*/
function form_type_textfield_value($element, $input = FALSE) {
if ($input !== FALSE && $input !== NULL) {
// Equate $input to the form value to ensure it's marked for
// validation.
return str_replace(array("\r", "\n"), '', $input);
}
}
/**
* Helper function to determine the value for form's token value.
*
* @param $element
* The form element whose value is being populated.
* @param $input
* The incoming input to populate the form element. If this is FALSE,
* the element's default value should be returned.
* @return
* The data that will appear in the $element_state['values'] collection
* for this element. Return nothing to use the default.
*/
function form_type_token_value($element, $input = FALSE) {
if ($input !== FALSE) {
return (string) $input;
}
}
/**
* Change submitted form values during form validation.
*
* Use this function to change the submitted value of a form element in a form
* validation function, so that the changed value persists in $form_state
* through to the submission handlers.
*
* Note that form validation functions are specified in the '#validate'
* component of the form array (the value of $form['#validate'] is an array of
* validation function names). If the form does not originate in your module,
* you can implement hook_form_FORM_ID_alter() to add a validation function
* to $form['#validate'].
*
* @param $element
* The form element that should have its value updated; in most cases you can
* just pass in the element from the $form array, although the only component
* that is actually used is '#parents'. If constructing yourself, set
* $element['#parents'] to be an array giving the path through the form
* array's keys to the element whose value you want to update. For instance,
* if you want to update the value of $form['elem1']['elem2'], which should be
* stored in $form_state['values']['elem1']['elem2'], you would set
* $element['#parents'] = array('elem1','elem2').
* @param $value
* The new value for the form element.
* @param $form_state
* Form state array where the value change should be recorded.
*/
function form_set_value($element, $value, &$form_state) {
drupal_array_set_nested_value($form_state['values'], $element['#parents'], $value);
}
/**
* Allows PHP array processing of multiple select options with the same value.
*
* Used for form select elements which need to validate HTML option groups
* and multiple options which may return the same value. Associative PHP arrays
* cannot handle these structures, since they share a common key.
*
* @param $array
* The form options array to process.
*
* @return
* An array with all hierarchical elements flattened to a single array.
*/
function form_options_flatten($array) {
// Always reset static var when first entering the recursion.
drupal_static_reset('_form_options_flatten');
return _form_options_flatten($array);
}
/**
* Helper function for form_options_flatten().
*
* Iterates over arrays which may share common values and produces a flat
* array that has removed duplicate keys. Also handles cases where objects
* are passed as array values.
*/
function _form_options_flatten($array) {
$return = &drupal_static(__FUNCTION__);
foreach ($array as $key => $value) {
if (is_object($value)) {
_form_options_flatten($value->option);
}
elseif (is_array($value)) {
_form_options_flatten($value);
}
else {
$return[$key] = 1;
}
}
return $return;
}
/**
* Processes a select list form element.
*
* This process callback is mandatory for select fields, since all user agents
* automatically preselect the first available option of single (non-multiple)
* select lists.
*
* @param $element
* The form element to process. Properties used:
* - #multiple: (optional) Indicates whether one or more options can be
* selected. Defaults to FALSE.
* - #default_value: Must be NULL or not set in case there is no value for the
* element yet, in which case a first default option is inserted by default.
* Whether this first option is a valid option depends on whether the field
* is #required or not.
* - #required: (optional) Whether the user needs to select an option (TRUE)
* or not (FALSE). Defaults to FALSE.
* - #empty_option: (optional) The label to show for the first default option.
* By default, the label is automatically set to "- Please select -" for a
* required field and "- None -" for an optional field.
* - #empty_value: (optional) The value for the first default option, which is
* used to determine whether the user submitted a value or not.
* - If #required is TRUE, this defaults to '' (an empty string).
* - If #required is not TRUE and this value isn't set, then no extra option
* is added to the select control, leaving the control in a slightly
* illogical state, because there's no way for the user to select nothing,
* since all user agents automatically preselect the first available
* option. But people are used to this being the behavior of select
* controls.
* @todo Address the above issue in Drupal 8.
* - If #required is not TRUE and this value is set (most commonly to an
* empty string), then an extra option (see #empty_option above)
* representing a "non-selection" is added with this as its value.
*
* @see _form_validate()
*/
function form_process_select($element) {
// #multiple select fields need a special #name.
if ($element['#multiple']) {
$element['#attributes']['multiple'] = 'multiple';
$element['#attributes']['name'] = $element['#name'] . '[]';
}
// A non-#multiple select needs special handling to prevent user agents from
// preselecting the first option without intention. #multiple select lists do
// not get an empty option, as it would not make sense, user interface-wise.
else {
$required = $element['#required'];
// If the element is required and there is no #default_value, then add an
// empty option that will fail validation, so that the user is required to
// make a choice. Also, if there's a value for #empty_value or
// #empty_option, then add an option that represents emptiness.
if (($required && !isset($element['#default_value'])) || isset($element['#empty_value']) || isset($element['#empty_option'])) {
$element += array(
'#empty_value' => '',
'#empty_option' => $required ? t('- Select - ') : t('- None -'),
);
// The empty option is prepended to #options and purposively not merged
// to prevent another option in #options mistakenly using the same value
// as #empty_value.
$empty_option = array($element['#empty_value'] => $element['#empty_option']);
$element['#options'] = $empty_option + $element['#options'];
}
}
return $element;
}
/**
* Returns HTML for a select form element.
*
* It is possible to group options together; to do this, change the format of
* $options to an associative array in which the keys are group labels, and the
* values are associative arrays in the normal $options format.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #title, #value, #options, #description, #extra,
* #multiple, #required, #name, #attributes, #size.
*
* @ingroup themeable
*/
function theme_select($variables) {
$element = $variables['element'];
element_set_attributes($element, array('id', 'name', 'size'));
_form_set_class($element, array('form-select'));
return '<select' . drupal_attributes($element['#attributes']) . '>' . form_select_options($element) . '</select>';
}
/**
* Converts a select form element's options array into an HTML.
*
* @param $element
* An associative array containing the properties of the element.
* @param $choices
* Mixed: Either an associative array of items to list as choices, or an
* object with an 'option' member that is an associative array. This
* parameter is only used internally and should not be passed.
* @return
* An HTML string of options for the select form element.
*/
function form_select_options($element, $choices = NULL) {
if (!isset($choices)) {
$choices = $element['#options'];
}
// array_key_exists() accommodates the rare event where $element['#value'] is NULL.
// isset() fails in this situation.
$value_valid = isset($element['#value']) || array_key_exists('#value', $element);
$value_is_array = $value_valid && is_array($element['#value']);
$options = '';
foreach ($choices as $key => $choice) {
if (is_array($choice)) {
$options .= '<optgroup label="' . $key . '">';
$options .= form_select_options($element, $choice);
$options .= '</optgroup>';
}
elseif (is_object($choice)) {
$options .= form_select_options($element, $choice->option);
}
else {
$key = (string) $key;
if ($value_valid && (!$value_is_array && (string) $element['#value'] === $key || ($value_is_array && in_array($key, $element['#value'])))) {
$selected = ' selected="selected"';
}
else {
$selected = '';
}
$options .= '<option value="' . check_plain($key) . '"' . $selected . '>' . check_plain($choice) . '</option>';
}
}
return $options;
}
/**
* Traverses a select element's #option array looking for any values
* that hold the given key. Returns an array of indexes that match.
*
* This function is useful if you need to modify the options that are
* already in a form element; for example, to remove choices which are
* not valid because of additional filters imposed by another module.
* One example might be altering the choices in a taxonomy selector.
* To correctly handle the case of a multiple hierarchy taxonomy,
* #options arrays can now hold an array of objects, instead of a
* direct mapping of keys to labels, so that multiple choices in the
* selector can have the same key (and label). This makes it difficult
* to manipulate directly, which is why this helper function exists.
*
* This function does not support optgroups (when the elements of the
* #options array are themselves arrays), and will return FALSE if
* arrays are found. The caller must either flatten/restore or
* manually do their manipulations in this case, since returning the
* index is not sufficient, and supporting this would make the
* "helper" too complicated and cumbersome to be of any help.
*
* As usual with functions that can return array() or FALSE, do not
* forget to use === and !== if needed.
*
* @param $element
* The select element to search.
* @param $key
* The key to look for.
* @return
* An array of indexes that match the given $key. Array will be
* empty if no elements were found. FALSE if optgroups were found.
*/
function form_get_options($element, $key) {
$keys = array();
foreach ($element['#options'] as $index => $choice) {
if (is_array($choice)) {
return FALSE;
}
elseif (is_object($choice)) {
if (isset($choice->option[$key])) {
$keys[] = $index;
}
}
elseif ($index == $key) {
$keys[] = $index;
}
}
return $keys;
}
/**
* Returns HTML for a fieldset form element and its children.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #attributes, #children, #collapsed, #collapsible,
* #description, #id, #title, #value.
*
* @ingroup themeable
*/
function theme_fieldset($variables) {
$element = $variables['element'];
element_set_attributes($element, array('id'));
_form_set_class($element, array('form-wrapper'));
$output = '<fieldset' . drupal_attributes($element['#attributes']) . '>';
if (!empty($element['#title'])) {
// Always wrap fieldset legends in a SPAN for CSS positioning.
$output .= '<legend><span class="fieldset-legend">' . $element['#title'] . '</span></legend>';
}
$output .= '<div class="fieldset-wrapper">';
if (!empty($element['#description'])) {
$output .= '<div class="fieldset-description">' . $element['#description'] . '</div>';
}
$output .= $element['#children'];
if (isset($element['#value'])) {
$output .= $element['#value'];
}
$output .= '</div>';
$output .= "</fieldset>\n";
return $output;
}
/**
* Returns HTML for a radio button form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #required, #return_value, #value, #attributes, #title,
* #description
*
* @ingroup themeable
*/
function theme_radio($variables) {
$element = $variables['element'];
$element['#attributes']['type'] = 'radio';
element_set_attributes($element, array('id', 'name', '#return_value' => 'value'));
if (isset($element['#return_value']) && check_plain($element['#value']) == $element['#return_value']) {
$element['#attributes']['checked'] = 'checked';
}
_form_set_class($element, array('form-radio'));
return '<input' . drupal_attributes($element['#attributes']) . ' />';
}
/**
* Returns HTML for a set of radio button form elements.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #title, #value, #options, #description, #required,
* #attributes, #children.
*
* @ingroup themeable
*/
function theme_radios($variables) {
$element = $variables['element'];
$attributes = array();
if (isset($element['#id'])) {
$attributes['id'] = $element['#id'];
}
$attributes['class'] = 'form-radios';
if (!empty($element['#attributes']['class'])) {
$attributes['class'] .= ' ' . implode(' ', $element['#attributes']['class']);
}
return '<div' . drupal_attributes($attributes) . '>' . (!empty($element['#children']) ? $element['#children'] : '') . '</div>';
}
/**
* Expand a password_confirm field into two text boxes.
*/
function form_process_password_confirm($element) {
$element['pass1'] = array(
'#type' => 'password',
'#title' => t('Password'),
'#value' => empty($element['#value']) ? NULL : $element['#value']['pass1'],
'#required' => $element['#required'],
'#attributes' => array('class' => array('password-field')),
);
$element['pass2'] = array(
'#type' => 'password',
'#title' => t('Confirm password'),
'#value' => empty($element['#value']) ? NULL : $element['#value']['pass2'],
'#required' => $element['#required'],
'#attributes' => array('class' => array('password-confirm')),
);
$element['#element_validate'] = array('password_confirm_validate');
$element['#tree'] = TRUE;
if (isset($element['#size'])) {
$element['pass1']['#size'] = $element['pass2']['#size'] = $element['#size'];
}
return $element;
}
/**
* Validate password_confirm element.
*/
function password_confirm_validate($element, &$element_state) {
$pass1 = trim($element['pass1']['#value']);
$pass2 = trim($element['pass2']['#value']);
if (!empty($pass1) || !empty($pass2)) {
if (strcmp($pass1, $pass2)) {
form_error($element, t('The specified passwords do not match.'));
}
}
elseif ($element['#required'] && !empty($element_state['input'])) {
form_error($element, t('Password field is required.'));
}
// Password field must be converted from a two-element array into a single
// string regardless of validation results.
form_set_value($element['pass1'], NULL, $element_state);
form_set_value($element['pass2'], NULL, $element_state);
form_set_value($element, $pass1, $element_state);
return $element;
}
/**
* Returns HTML for a date selection form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #title, #value, #options, #description, #required,
* #attributes.
*
* @ingroup themeable
*/
function theme_date($variables) {
$element = $variables['element'];
return '<div class="container-inline">' . drupal_render_children($element) . '</div>';
}
/**
* Roll out a single date element.
*/
function form_process_date($element) {
// Default to current date
if (empty($element['#value'])) {
$element['#value'] = array(
'day' => format_date(REQUEST_TIME, 'custom', 'j'),
'month' => format_date(REQUEST_TIME, 'custom', 'n'),
'year' => format_date(REQUEST_TIME, 'custom', 'Y'),
);
}
$element['#tree'] = TRUE;
// Determine the order of day, month, year in the site's chosen date format.
$format = variable_get('date_format_short', 'm/d/Y - H:i');
$sort = array();
$sort['day'] = max(strpos($format, 'd'), strpos($format, 'j'));
$sort['month'] = max(strpos($format, 'm'), strpos($format, 'M'));
$sort['year'] = strpos($format, 'Y');
asort($sort);
$order = array_keys($sort);
// Output multi-selector for date.
foreach ($order as $type) {
switch ($type) {
case 'day':
$options = drupal_map_assoc(range(1, 31));
break;
case 'month':
$options = drupal_map_assoc(range(1, 12), 'map_month');
break;
case 'year':
$options = drupal_map_assoc(range(1900, 2050));
break;
}
$element[$type] = array(
'#type' => 'select',
'#value' => $element['#value'][$type],
'#attributes' => $element['#attributes'],
'#options' => $options,
);
}
return $element;
}
/**
* Validates the date type to stop dates like February 30, 2006.
*/
function date_validate($form) {
if (!checkdate($form['#value']['month'], $form['#value']['day'], $form['#value']['year'])) {
form_error($form, t('The specified date is invalid.'));
}
}
/**
* Helper function for usage with drupal_map_assoc to display month names.
*/
function map_month($month) {
$months = &drupal_static(__FUNCTION__, array(
1 => 'Jan',
2 => 'Feb',
3 => 'Mar',
4 => 'Apr',
5 => 'May',
6 => 'Jun',
7 => 'Jul',
8 => 'Aug',
9 => 'Sep',
10 => 'Oct',
11 => 'Nov',
12 => 'Dec',
));
return t($months[$month]);
}
/**
* If no default value is set for weight select boxes, use 0.
*/
function weight_value(&$form) {
if (isset($form['#default_value'])) {
$form['#value'] = $form['#default_value'];
}
else {
$form['#value'] = 0;
}
}
/**
* Roll out a single radios element to a list of radios,
* using the options array as index.
*/
function form_process_radios($element) {
if (count($element['#options']) > 0) {
foreach ($element['#options'] as $key => $choice) {
if (!isset($element[$key])) {
// Generate the parents as the autogenerator does, so we will have a
// unique id for each radio button.
$parents_for_id = array_merge($element['#parents'], array($key));
$element[$key] = array(
'#type' => 'radio',
'#title' => $choice,
'#return_value' => check_plain($key),
'#default_value' => isset($element['#default_value']) ? $element['#default_value'] : NULL,
'#attributes' => $element['#attributes'],
'#parents' => $element['#parents'],
'#id' => drupal_html_id('edit-' . implode('-', $parents_for_id)),
'#ajax' => isset($element['#ajax']) ? $element['#ajax'] : NULL,
);
}
}
}
return $element;
}
/**
* Returns HTML for a checkbox form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #title, #value, #return_value, #description, #required,
* #attributes.
*
* @ingroup themeable
*/
function theme_checkbox($variables) {
$element = $variables['element'];
$t = get_t();
$element['#attributes']['type'] = 'checkbox';
element_set_attributes($element, array('id', 'name', '#return_value' => 'value'));
// Unchecked checkbox has #value of integer 0.
if (isset($element['#return_value']) && isset($element['#value']) && $element['#value'] !== 0 && $element['#value'] == $element['#return_value']) {
$element['#attributes']['checked'] = 'checked';
}
_form_set_class($element, array('form-checkbox'));
return '<input' . drupal_attributes($element['#attributes']) . ' />';
}
/**
* Returns HTML for a set of checkbox form elements.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #children, #attributes.
*
* @ingroup themeable
*/
function theme_checkboxes($variables) {
$element = $variables['element'];
$attributes = array();
if (isset($element['#id'])) {
$attributes['id'] = $element['#id'];
}
$attributes['class'][] = 'form-checkboxes';
if (!empty($element['#attributes']['class'])) {
$attributes['class'] = array_merge($attributes['class'], $element['#attributes']['class']);
}
return '<div' . drupal_attributes($attributes) . '>' . (!empty($element['#children']) ? $element['#children'] : '') . '</div>';
}
/**
* Add form_element theming to an element if title or description is set.
*
* This is used as a pre render function for checkboxes and radios.
*/
function form_pre_render_conditional_form_element($element) {
// Set the element's title attribute to show #title as a tooltip, if needed.
if (isset($element['#title']) && $element['#title_display'] == 'attribute') {
$element['#attributes']['title'] = $element['#title'];
if (!empty($element['#required'])) {
// Append an indication that this field is required.
$element['#attributes']['title'] .= ' (' . $t('Required') . ')';
}
}
if (isset($element['#title']) || isset($element['#description'])) {
$element['#theme_wrappers'][] = 'form_element';
}
return $element;
}
function form_process_checkboxes($element) {
$value = is_array($element['#value']) ? $element['#value'] : array();
$element['#tree'] = TRUE;
if (count($element['#options']) > 0) {
if (!isset($element['#default_value']) || $element['#default_value'] == 0) {
$element['#default_value'] = array();
}
foreach ($element['#options'] as $key => $choice) {
if (!isset($element[$key])) {
$element[$key] = array(
'#type' => 'checkbox',
'#processed' => TRUE,
'#title' => $choice,
'#return_value' => $key,
'#default_value' => isset($value[$key]) ? $key : NULL,
'#attributes' => $element['#attributes'],
'#ajax' => isset($element['#ajax']) ? $element['#ajax'] : NULL,
);
}
}
}
return $element;
}
/**
* Processes a form actions container element.
*
* @param $element
* An associative array containing the properties and children of the
* form actions container.
* @param $form_state
* The $form_state array for the form this element belongs to.
*
* @return
* The processed element.
*/
function form_process_actions($element, &$form_state) {
$element['#attributes']['class'][] = 'form-actions';
return $element;
}
/**
* Processes a container element.
*
* @param $element
* An associative array containing the properties and children of the
* container.
* @param $form_state
* The $form_state array for the form this element belongs to.
* @return
* The processed element.
*/
function form_process_container($element, &$form_state) {
// Generate the ID of the element if it's not explicitly given.
if (!isset($element['#id'])) {
$element['#id'] = drupal_html_id(implode('-', $element['#parents']) . '-wrapper');
}
return $element;
}
/**
* Returns HTML for a container for grouped form items.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #id, #attributes, #children.
*
* @ingroup themeable
*/
function theme_container($variables) {
$element = $variables['element'];
if (!isset($element['#attributes']['id'])) {
$element['#attributes']['id'] = $element['#id'];
}
// Force the 'form-wrapper' class.
$element['#attributes']['class'][] = 'form-wrapper';
return '<div' . drupal_attributes($element['#attributes']) . '>' . $element['#children'] . '</div>';
}
/**
* Returns HTML for a table with radio buttons or checkboxes.
*
* An example of per-row options:
* @code
* $options = array();
* $options[0]['title'] = "A red row"
* $options[0]['#attributes'] = array ('class' => array('red-row'));
* $options[1]['title'] = "A blue row"
* $options[1]['#attributes'] = array ('class' => array('blue-row'));
*
* $form['myselector'] = array (
* '#type' => 'tableselect',
* '#title' => 'My Selector'
* '#options' => $options,
* );
* @endcode
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties and children of
* the tableselect element. Properties used: #header, #options, #empty,
* and #js_select. The #options property is an array of selection options;
* each array element of #options is an array of properties. These
* properties can include #attributes, which is added to the
* table row's HTML attributes; see theme_table().
*
* @ingroup themeable
*/
function theme_tableselect($variables) {
$element = $variables['element'];
$rows = array();
$header = $element['#header'];
if (!empty($element['#options'])) {
// Generate a table row for each selectable item in #options.
foreach (element_children($element) as $key) {
$row = array();
$row['data'] = array();
if (isset($element['#options'][$key]['#attributes'])) {
$row += $element['#options'][$key]['#attributes'];
}
// Render the checkbox / radio element.
$row['data'][] = drupal_render($element[$key]);
// As theme_table only maps header and row columns by order, create the
// correct order by iterating over the header fields.
foreach ($element['#header'] as $fieldname => $title) {
$row['data'][] = $element['#options'][$key][$fieldname];
}
$rows[] = $row;
}
// Add an empty header or a "Select all" checkbox to provide room for the
// checkboxes/radios in the first table column.
if ($element['#js_select']) {
// Add a "Select all" checkbox.
drupal_add_js('misc/tableselect.js');
array_unshift($header, array('class' => array('select-all')));
}
else {
// Add an empty header when radio buttons are displayed or a "Select all"
// checkbox is not desired.
array_unshift($header, '');
}
}
return theme('table', array('header' => $header, 'rows' => $rows, 'empty' => $element['#empty'], 'attributes' => $element['#attributes']));
}
/**
* Create the correct amount of checkbox or radio elements to populate the table.
*
* @param $element
* An associative array containing the properties and children of the
* tableselect element.
* @return
* The processed element.
*/
function form_process_tableselect($element) {
if ($element['#multiple']) {
$value = is_array($element['#value']) ? $element['#value'] : array();
}
else {
// Advanced selection behaviour make no sense for radios.
$element['#js_select'] = FALSE;
}
$element['#tree'] = TRUE;
if (count($element['#options']) > 0) {
if (!isset($element['#default_value']) || $element['#default_value'] === 0) {
$element['#default_value'] = array();
}
// Create a checkbox or radio for each item in #options in such a way that
// the value of the tableselect element behaves as if it had been of type
// checkboxes or radios.
foreach ($element['#options'] as $key => $choice) {
// Do not overwrite manually created children.
if (!isset($element[$key])) {
if ($element['#multiple']) {
$element[$key] = array(
'#type' => 'checkbox',
'#title' => '',
'#return_value' => $key,
'#default_value' => isset($value[$key]) ? $key : NULL,
'#attributes' => $element['#attributes'],
);
}
else {
// Generate the parents as the autogenerator does, so we will have a
// unique id for each radio button.
$parents_for_id = array_merge($element['#parents'], array($key));
$element[$key] = array(
'#type' => 'radio',
'#title' => '',
'#return_value' => $key,
'#default_value' => ($element['#default_value'] == $key) ? $key : NULL,
'#attributes' => $element['#attributes'],
'#parents' => $element['#parents'],
'#id' => drupal_html_id('edit-' . implode('-', $parents_for_id)),
'#ajax' => isset($element['#ajax']) ? $element['#ajax'] : NULL,
);
}
if (isset($element['#options'][$key]['#weight'])) {
$element[$key]['#weight'] = $element['#options'][$key]['#weight'];
}
}
}
}
else {
$element['#value'] = array();
}
return $element;
}
/**
* Adds fieldsets to the specified group or adds group members to this
* fieldset.
*
* @param &$element
* An associative array containing the properties and children of the
* fieldset. Note that $element must be taken by reference here, so processed
* child elements are taken over into $form_state.
* @param $form_state
* The $form_state array for the form this fieldset belongs to.
* @return
* The processed element.
*/
function form_process_fieldset(&$element, &$form_state) {
$parents = implode('][', $element['#parents']);
// Each fieldset forms a new group. The #type 'vertical_tabs' basically only
// injects a new fieldset.
$form_state['groups'][$parents]['#group_exists'] = TRUE;
$element['#groups'] = &$form_state['groups'];
// Process vertical tabs group member fieldsets.
if (isset($element['#group'])) {
// Add this fieldset to the defined group (by reference).
$group = $element['#group'];
$form_state['groups'][$group][] = &$element;
}
// Contains form element summary functionalities.
$element['#attached']['js']['misc/form.js'] = array('group' => JS_LIBRARY, 'weight' => 1);
// The .form-wrapper class is required for #states to treat fieldsets like
// containers.
if (!isset($element['#attributes']['class'])) {
$element['#attributes']['class'] = array();
}
// Collapsible fieldsets
if (!empty($element['#collapsible'])) {
$element['#attached']['js'][] = 'misc/collapse.js';
$element['#attributes']['class'][] = 'collapsible';
if (!empty($element['#collapsed'])) {
$element['#attributes']['class'][] = 'collapsed';
}
}
return $element;
}
/**
* Adds members of this group as actual elements for rendering.
*
* @param $element
* An associative array containing the properties and children of the
* fieldset.
*
* @return
* The modified element with all group members.
*/
function form_pre_render_fieldset($element) {
// Fieldsets may be rendered outside of a Form API context.
if (!isset($element['#parents']) || !isset($element['#groups'])) {
return $element;
}
// Inject group member elements belonging to this group.
$parents = implode('][', $element['#parents']);
$children = element_children($element['#groups'][$parents]);
if (!empty($children)) {
foreach ($children as $key) {
// Break references and indicate that the element should be rendered as
// group member.
$child = (array) $element['#groups'][$parents][$key];
$child['#group_fieldset'] = TRUE;
// Inject the element as new child element.
$element[] = $child;
$sort = TRUE;
}
// Re-sort the element's children if we injected group member elements.
if (isset($sort)) {
$element['#sorted'] = FALSE;
}
}
if (isset($element['#group'])) {
$group = $element['#group'];
// If this element belongs to a group, but the group-holding element does
// not exist, we need to render it (at its original location).
if (!isset($element['#groups'][$group]['#group_exists'])) {
// Intentionally empty to clarify the flow; we simply return $element.
}
// If we injected this element into the group, then we want to render it.
elseif (!empty($element['#group_fieldset'])) {
// Intentionally empty to clarify the flow; we simply return $element.
}
// Otherwise, this element belongs to a group and the group exists, so we do
// not render it.
elseif (element_children($element['#groups'][$group])) {
$element['#printed'] = TRUE;
}
}
return $element;
}
/**
* Creates a group formatted as vertical tabs.
*
* @param $element
* An associative array containing the properties and children of the
* fieldset.
* @param $form_state
* The $form_state array for the form this vertical tab widget belongs to.
* @return
* The processed element.
*/
function form_process_vertical_tabs($element, &$form_state) {
// Inject a new fieldset as child, so that form_process_fieldset() processes
// this fieldset like any other fieldset.
$element['group'] = array(
'#type' => 'fieldset',
'#theme_wrappers' => array(),
'#parents' => $element['#parents'],
);
// The JavaScript stores the currently selected tab in this hidden
// field so that the active tab can be restored the next time the
// form is rendered, e.g. on preview pages or when form validation
// fails.
$name = implode('__', $element['#parents']);
if (isset($form_state['values'][$name . '__active_tab'])) {
$element['#default_tab'] = $form_state['values'][$name . '__active_tab'];
}
$element[$name . '__active_tab'] = array(
'#type' => 'hidden',
'#default_value' => $element['#default_tab'],
'#attributes' => array('class' => array('vertical-tabs-active-tab')),
);
return $element;
}
/**
* Returns HTML for an element's children fieldsets as vertical tabs.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties and children of the
* fieldset. Properties used: #children.
*
* @ingroup themeable
*/
function theme_vertical_tabs($variables) {
$element = $variables['element'];
// Add required JavaScript and Stylesheet.
drupal_add_library('system', 'vertical-tabs');
$output = '<h2 class="element-invisible">' . t('Vertical Tabs') . '</h2>';
$output .= '<div class="vertical-tabs-panes">' . $element['#children'] . '</div>';
return $output;
}
/**
* Returns HTML for a submit button form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #attributes, #button_type, #name, #value.
*
* @ingroup themeable
*/
function theme_submit($variables) {
return theme('button', $variables['element']);
}
/**
* Returns HTML for a button form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #attributes, #button_type, #name, #value.
*
* @ingroup themeable
*/
function theme_button($variables) {
$element = $variables['element'];
$element['#attributes']['type'] = 'submit';
element_set_attributes($element, array('id', 'name', 'value'));
$element['#attributes']['class'][] = 'form-' . $element['#button_type'];
if (!empty($element['#attributes']['disabled'])) {
$element['#attributes']['class'][] = 'form-button-disabled';
}
return '<input' . drupal_attributes($element['#attributes']) . ' />';
}
/**
* Returns HTML for an image button form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #attributes, #button_type, #name, #value, #title, #src.
*
* @ingroup themeable
*/
function theme_image_button($variables) {
$element = $variables['element'];
$element['#attributes']['type'] = 'image';
element_set_attributes($element, array('id', 'name', 'value'));
$element['#attributes']['src'] = file_create_url($element['#src']);
if (!empty($element['#title'])) {
$element['#attributes']['alt'] = $element['#title'];
$element['#attributes']['title'] = $element['#title'];
}
$element['#attributes']['class'][] = 'form-' . $element['#button_type'];
if (!empty($element['#attributes']['disabled'])) {
$element['#attributes']['class'][] = 'form-button-disabled';
}
return '<input' . drupal_attributes($element['#attributes']) . ' />';
}
/**
* Returns HTML for a hidden form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #name, #value, #attributes.
*
* @ingroup themeable
*/
function theme_hidden($variables) {
$element = $variables['element'];
$element['#attributes']['type'] = 'hidden';
element_set_attributes($element, array('name', 'value'));
return '<input' . drupal_attributes($element['#attributes']) . " />\n";
}
/**
* Returns HTML for a textfield form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #title, #value, #description, #size, #maxlength,
* #required, #attributes, #autocomplete_path.
*
* @ingroup themeable
*/
function theme_textfield($variables) {
$element = $variables['element'];
$element['#attributes']['type'] = 'text';
element_set_attributes($element, array('id', 'name', 'value', 'size', 'maxlength'));
_form_set_class($element, array('form-text'));
$extra = '';
if ($element['#autocomplete_path'] && drupal_valid_path($element['#autocomplete_path'])) {
drupal_add_js('misc/autocomplete.js');
$element['#attributes']['class'][] = 'form-autocomplete';
$attributes = array();
$attributes['type'] = 'hidden';
$attributes['id'] = $element['#attributes']['id'] . '-autocomplete';
$attributes['value'] = url($element['#autocomplete_path'], array('absolute' => TRUE));
$attributes['disabled'] = 'disabled';
$attributes['class'][] = 'autocomplete';
$extra = '<input' . drupal_attributes($attributes) . ' />';
}
$output = '<input' . drupal_attributes($element['#attributes']) . ' />';
return $output . $extra;
}
/**
* Returns HTML for a form.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #action, #method, #attributes, #children
*
* @ingroup themeable
*/
function theme_form($variables) {
$element = $variables['element'];
if (isset($element['#action'])) {
$element['#attributes']['action'] = drupal_strip_dangerous_protocols($element['#action']);
}
element_set_attributes($element, array('method', 'id'));
if (empty($element['#attributes']['accept-charset'])) {
$element['#attributes']['accept-charset'] = "UTF-8";
}
// Anonymous DIV to satisfy XHTML compliance.
return '<form' . drupal_attributes($element['#attributes']) . '><div>' . $element['#children'] . '</div></form>';
}
/**
* Returns HTML for a textarea form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #title, #value, #description, #rows, #cols, #required,
* #attributes
*
* @ingroup themeable
*/
function theme_textarea($variables) {
$element = $variables['element'];
element_set_attributes($element, array('id', 'name', 'cols', 'rows'));
_form_set_class($element, array('form-textarea'));
$wrapper_attributes = array(
'class' => array('form-textarea-wrapper'),
);
// Add resizable behavior.
if (!empty($element['#resizable'])) {
drupal_add_js('misc/textarea.js');
$wrapper_attributes['class'][] = 'resizable';
}
$output = '<div' . drupal_attributes($wrapper_attributes) . '>';
$output .= '<textarea' . drupal_attributes($element['#attributes']) . '>' . check_plain($element['#value']) . '</textarea>';
$output .= '</div>';
return $output;
}
/**
* Returns HTML for a password form element.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #title, #value, #description, #size, #maxlength,
* #required, #attributes.
*
* @ingroup themeable
*/
function theme_password($variables) {
$element = $variables['element'];
$element['#attributes']['type'] = 'password';
element_set_attributes($element, array('id', 'name', 'value', 'size', 'maxlength'));
_form_set_class($element, array('form-text'));
return '<input' . drupal_attributes($element['#attributes']) . ' />';
}
/**
* Expand weight elements into selects.
*/
function form_process_weight($element) {
for ($n = (-1 * $element['#delta']); $n <= $element['#delta']; $n++) {
$weights[$n] = $n;
}
$element['#options'] = $weights;
$element['#type'] = 'select';
$element['#is_weight'] = TRUE;
$element += element_info('select');
return $element;
}
/**
* Returns HTML for a file upload form element.
*
* For assistance with handling the uploaded file correctly, see the API
* provided by file.inc.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #title, #name, #size, #description, #required,
* #attributes.
*
* @ingroup themeable
*/
function theme_file($variables) {
$element = $variables['element'];
$element['#attributes']['type'] = 'file';
element_set_attributes($element, array('id', 'name', 'size'));
_form_set_class($element, array('form-file'));
return '<input' . drupal_attributes($element['#attributes']) . ' />';
}
/**
* Returns HTML for a form element.
*
* Each form element is wrapped in a DIV container having the following CSS
* classes:
* - form-item: Generic for all form elements.
* - form-type-#type: The internal element #type.
* - form-item-#name: The internal form element #name (usually derived from the
* $form structure and set via form_builder()).
* - form-disabled: Only set if the form element is #disabled.
*
* In addition to the element itself, the DIV contains a label for the element
* based on the optional #title_display property, and an optional #description.
*
* The optional #title_display property can have these values:
* - before: The label is output before the element. This is the default.
* The label includes the #title and the required marker, if #required.
* - after: The label is output after the element. For example, this is used
* for radio and checkbox #type elements as set in system_element_info().
* If the #title is empty but the field is #required, the label will
* contain only the required marker.
* - invisible: Labels are critical for screen readers to enable them to
* properly navigate through forms but can be visually distracting. This
* property hides the label for everyone except screen readers.
* - attribute: Set the title attribute on the element to create a tooltip
* but output no label element. This is supported only for checkboxes
* and radios in form_pre_render_conditional_form_element(). It is used
* where a visual label is not needed, such as a table of checkboxes where
* the row and column provide the context. The tooltip will include the
* title and required marker.
*
* If the #title property is not set, then the label and any required marker
* will not be output, regardless of the #title_display or #required values.
* This can be useful in cases such as the password_confirm element, which
* creates children elements that have their own labels and required markers,
* but the parent element should have neither. Use this carefully because a
* field without an associated label can cause accessibility challenges.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #title, #title_display, #description, #id, #required,
* #children, #type, #name.
*
* @ingroup themeable
*/
function theme_form_element($variables) {
$element = &$variables['element'];
// This is also used in the installer, pre-database setup.
$t = get_t();
// This function is invoked as theme wrapper, but the rendered form element
// may not necessarily have been processed by form_builder().
$element += array(
'#title_display' => 'before',
);
// Add element #id for #type 'item'.
if (isset($element['#markup']) && !empty($element['#id'])) {
$attributes['id'] = $element['#id'];
}
// Add element's #type and #name as class to aid with JS/CSS selectors.
$attributes['class'] = array('form-item');
if (!empty($element['#type'])) {
$attributes['class'][] = 'form-type-' . strtr($element['#type'], '_', '-');
}
if (!empty($element['#name'])) {
$attributes['class'][] = 'form-item-' . strtr($element['#name'], array(' ' => '-', '_' => '-', '[' => '-', ']' => ''));
}
// Add a class for disabled elements to facilitate cross-browser styling.
if (!empty($element['#attributes']['disabled'])) {
$attributes['class'][] = 'form-disabled';
}
$output = '<div' . drupal_attributes($attributes) . '>' . "\n";
// If #title is not set, we don't display any label or required marker.
if (!isset($element['#title'])) {
$element['#title_display'] = 'none';
}
$prefix = isset($element['#field_prefix']) ? '<span class="field-prefix">' . $element['#field_prefix'] . '</span> ' : '';
$suffix = isset($element['#field_suffix']) ? ' <span class="field-suffix">' . $element['#field_suffix'] . '</span>' : '';
switch ($element['#title_display']) {
case 'before':
case 'invisible':
$output .= ' ' . theme('form_element_label', $variables);
$output .= ' ' . $prefix . $element['#children'] . $suffix . "\n";
break;
case 'after':
$output .= ' ' . $prefix . $element['#children'] . $suffix;
$output .= ' ' . theme('form_element_label', $variables) . "\n";
break;
case 'none':
case 'attribute':
// Output no label and no required marker, only the children.
$output .= ' ' . $prefix . $element['#children'] . $suffix . "\n";
break;
}
if (!empty($element['#description'])) {
$output .= '<div class="description">' . $element['#description'] . "</div>\n";
}
$output .= "</div>\n";
return $output;
}
/**
* Returns HTML for a marker for required form elements.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
*
* @ingroup themeable
*/
function theme_form_required_marker($variables) {
// This is also used in the installer, pre-database setup.
$t = get_t();
$attributes = array(
'class' => 'form-required',
'title' => $t('This field is required.'),
);
return '<span' . drupal_attributes($attributes) . '>*</span>';
}
/**
* Returns HTML for a form element label and required marker.
*
* Form element labels include the #title and a #required marker. The label is
* associated with the element itself by the element #id. Labels may appear
* before or after elements, depending on theme_form_element() and #title_display.
*
* This function will not be called for elements with no labels, depending on
* #title_display. For elements that have an empty #title and are not required,
* this function will output no label (''). For required elements that have an
* empty #title, this will output the required marker alone within the label.
* The label will use the #id to associate the marker with the field that is
* required. That is especially important for screenreader users to know
* which field is required.
*
* @param $variables
* An associative array containing:
* - element: An associative array containing the properties of the element.
* Properties used: #required, #title, #id, #value, #description.
*
* @ingroup themeable
*/
function theme_form_element_label($variables) {
$element = $variables['element'];
// This is also used in the installer, pre-database setup.
$t = get_t();
// If title and required marker are both empty, output no label.
if (empty($element['#title']) && empty($element['#required'])) {
return '';
}
// If the element is required, a required marker is appended to the label.
$required = !empty($element['#required']) ? theme('form_required_marker', array('element' => $element)) : '';
$title = filter_xss_admin($element['#title']);
$attributes = array();
// Style the label as class option to display inline with the element.
if ($element['#title_display'] == 'after') {
$attributes['class'] = 'option';
}
// Show label only to screen readers to avoid disruption in visual flows.
elseif ($element['#title_display'] == 'invisible') {
$attributes['class'] = 'element-invisible';
}
if (!empty($element['#id'])) {
$attributes['for'] = $element['#id'];
}
// The leading whitespace helps visually separate fields from inline labels.
return ' <label' . drupal_attributes($attributes) . '>' . $t('!title !required', array('!title' => $title, '!required' => $required)) . "</label>\n";
}
/**
* Sets a form element's class attribute.
*
* Adds 'required' and 'error' classes as needed.
*
* @param &$element
* The form element.
* @param $name
* Array of new class names to be added.
*/
function _form_set_class(&$element, $class = array()) {
if (!empty($class)) {
if (!isset($element['#attributes']['class'])) {
$element['#attributes']['class'] = array();
}
$element['#attributes']['class'] = array_merge($element['#attributes']['class'], $class);
}
// This function is invoked from form element theme functions, but the
// rendered form element may not necessarily have been processed by
// form_builder().
if (!empty($element['#required'])) {
$element['#attributes']['class'][] = 'required';
}
if (isset($element['#parents']) && form_get_error($element)) {
$element['#attributes']['class'][] = 'error';
}
}
/**
* @} End of "defgroup form_api".
*/
/**
* @defgroup batch Batch operations
* @{
* Functions allowing forms processing to be spread out over several page
* requests, thus ensuring that the processing does not get interrupted
* because of a PHP timeout, while allowing the user to receive feedback
* on the progress of the ongoing operations.
*
* The API is primarily designed to integrate nicely with the Form API
* workflow, but can also be used by non-Form API scripts (like update.php)
* or even simple page callbacks (which should probably be used sparingly).
*
* Example:
* @code
* $batch = array(
* 'title' => t('Exporting'),
* 'operations' => array(
* array('my_function_1', array($account->uid, 'story')),
* array('my_function_2', array()),
* ),
* 'finished' => 'my_finished_callback',
* 'file' => 'path_to_file_containing_myfunctions',
* );
* batch_set($batch);
* // only needed if not inside a form _submit handler :
* batch_process();
* @endcode
*
* Note: if the batch 'title', 'init_message', 'progress_message', or
* 'error_message' could contain any user input, it is the responsibility of
* the code calling batch_set() to sanitize them first with a function like
* check_plain() or filter_xss().
*
* Sample batch operations:
* @code
* // Simple and artificial: load a node of a given type for a given user
* function my_function_1($uid, $type, &$context) {
* // The $context array gathers batch context information about the execution (read),
* // as well as 'return values' for the current operation (write)
* // The following keys are provided :
* // 'results' (read / write): The array of results gathered so far by
* // the batch processing, for the current operation to append its own.
* // 'message' (write): A text message displayed in the progress page.
* // The following keys allow for multi-step operations :
* // 'sandbox' (read / write): An array that can be freely used to
* // store persistent data between iterations. It is recommended to
* // use this instead of $_SESSION, which is unsafe if the user
* // continues browsing in a separate window while the batch is processing.
* // 'finished' (write): A float number between 0 and 1 informing
* // the processing engine of the completion level for the operation.
* // 1 (or no value explicitly set) means the operation is finished
* // and the batch processing can continue to the next operation.
*
* $node = node_load(array('uid' => $uid, 'type' => $type));
* $context['results'][] = $node->nid . ' : ' . $node->title;
* $context['message'] = $node->title;
* }
*
* // More advanced example: multi-step operation - load all nodes, five by five
* function my_function_2(&$context) {
* if (empty($context['sandbox'])) {
* $context['sandbox']['progress'] = 0;
* $context['sandbox']['current_node'] = 0;
* $context['sandbox']['max'] = db_query('SELECT COUNT(DISTINCT nid) FROM {node}')->fetchField();
* }
* $limit = 5;
* $result = db_select('node')
* ->fields('node', array('nid'))
* ->condition('nid', $context['sandbox']['current_node'], '>')
* ->orderBy('nid')
* ->range(0, $limit)
* ->execute();
* foreach ($result as $row) {
* $node = node_load($row->nid, NULL, TRUE);
* $context['results'][] = $node->nid . ' : ' . $node->title;
* $context['sandbox']['progress']++;
* $context['sandbox']['current_node'] = $node->nid;
* $context['message'] = $node->title;
* }
* if ($context['sandbox']['progress'] != $context['sandbox']['max']) {
* $context['finished'] = $context['sandbox']['progress'] / $context['sandbox']['max'];
* }
* }
* @endcode
*
* Sample 'finished' callback:
* @code
* function batch_test_finished($success, $results, $operations) {
* if ($success) {
* $message = format_plural(count($results), 'One post processed.', '@count posts processed.');
* }
* else {
* $message = t('Finished with an error.');
* }
* drupal_set_message($message);
* // Providing data for the redirected page is done through $_SESSION.
* foreach ($results as $result) {
* $items[] = t('Loaded node %title.', array('%title' => $result));
* }
* $_SESSION['my_batch_results'] = $items;
* }
* @endcode
*/
/**
* Opens a new batch.
*
* @param $batch
* An array defining the batch. The following keys can be used -- only
* 'operations' is required, and batch_init() provides default values for
* the messages.
* - 'operations': Array of function calls to be performed.
* Example:
* @code
* array(
* array('my_function_1', array($arg1)),
* array('my_function_2', array($arg2_1, $arg2_2)),
* )
* @endcode
* - 'title': Title for the progress page. Only safe strings should be passed.
* Defaults to t('Processing').
* - 'init_message': Message displayed while the processing is initialized.
* Defaults to t('Initializing.').
* - 'progress_message': Message displayed while processing the batch.
* Available placeholders are @current, @remaining, @total, @percentage,
* @estimate and @elapsed. Defaults to t('Completed @current of @total.').
* - 'error_message': Message displayed if an error occurred while processing
* the batch. Defaults to t('An error has occurred.').
* - 'finished': Name of a function to be executed after the batch has
* completed. This should be used to perform any result massaging that
* may be needed, and possibly save data in $_SESSION for display after
* final page redirection.
* - 'file': Path to the file containing the definitions of the
* 'operations' and 'finished' functions, for instance if they don't
* reside in the main .module file. The path should be relative to
* base_path(), and thus should be built using drupal_get_path().
* - 'css': Array of paths to CSS files to be used on the progress page.
* - 'url_options': options passed to url() when constructing redirect
* URLs for the batch.
*
* Operations are added as new batch sets. Batch sets are used to ensure
* clean code independence, ensuring that several batches submitted by
* different parts of the code (core / contrib modules) can be processed
* correctly while not interfering or having to cope with each other. Each
* batch set gets to specify his own UI messages, operates on its own set
* of operations and results, and triggers its own 'finished' callback.
* Batch sets are processed sequentially, with the progress bar starting
* fresh for every new set.
*/
function batch_set($batch_definition) {
if ($batch_definition) {
$batch =& batch_get();
// Initialize the batch if needed.
if (empty($batch)) {
$batch = array(
'sets' => array(),
'has_form_submits' => FALSE,
);
}
// Base and default properties for the batch set.
// Use get_t() to allow batches at install time.
$t = get_t();
$init = array(
'sandbox' => array(),
'results' => array(),
'success' => FALSE,
'start' => 0,
'elapsed' => 0,
);
$defaults = array(
'title' => $t('Processing'),
'init_message' => $t('Initializing.'),
'progress_message' => $t('Completed @current of @total.'),
'error_message' => $t('An error has occurred.'),
'css' => array(),
);
$batch_set = $init + $batch_definition + $defaults;
// Tweak init_message to avoid the bottom of the page flickering down after
// init phase.
$batch_set['init_message'] .= '<br/>&nbsp;';
// The non-concurrent workflow of batch execution allows us to save
// numberOfItems() queries by handling our own counter.
$batch_set['total'] = count($batch_set['operations']);
$batch_set['count'] = $batch_set['total'];
// Add the set to the batch.
if (empty($batch['id'])) {
// The batch is not running yet. Simply add the new set.
$batch['sets'][] = $batch_set;
}
else {
// The set is being added while the batch is running. Insert the new set
// right after the current one to ensure execution order, and store its
// operations in a queue.
$index = $batch['current_set'] + 1;
$slice1 = array_slice($batch['sets'], 0, $index);
$slice2 = array_slice($batch['sets'], $index);
$batch['sets'] = array_merge($slice1, array($batch_set), $slice2);
_batch_populate_queue($batch, $index);
}
}
}
/**
* Processes the batch.
*
* Unless the batch has been marked with 'progressive' = FALSE, the function
* issues a drupal_goto and thus ends page execution.
*
* This function is generally not needed in form submit handlers;
* Form API takes care of batches that were set during form submission.
*
* @param $redirect
* (optional) Path to redirect to when the batch has finished processing.
* @param $url
* (optional - should only be used for separate scripts like update.php)
* URL of the batch processing page.
* @param $redirect_callback
* (optional) Specify a function to be called to redirect to the progressive
* processing page. By default drupal_goto() will be used to redirect to a
* page which will do the progressive page. Specifying another function will
* allow the progressive processing to be processed differently.
*/
function batch_process($redirect = NULL, $url = 'batch', $redirect_callback = 'drupal_goto') {
$batch =& batch_get();
drupal_theme_initialize();
if (isset($batch)) {
// Add process information
$process_info = array(
'current_set' => 0,
'progressive' => TRUE,
'url' => $url,
'url_options' => array(),
'source_url' => $_GET['q'],
'redirect' => $redirect,
'theme' => $GLOBALS['theme_key'],
'redirect_callback' => $redirect_callback,
);
$batch += $process_info;
// The batch is now completely built. Allow other modules to make changes
// to the batch so that it is easier to reuse batch processes in other
// environments.
drupal_alter('batch', $batch);
// Assign an arbitrary id: don't rely on a serial column in the 'batch'
// table, since non-progressive batches skip database storage completely.
$batch['id'] = db_next_id();
// Move operations to a job queue. Non-progressive batches will use a
// memory-based queue.
foreach ($batch['sets'] as $key => $batch_set) {
_batch_populate_queue($batch, $key);
}
// Initiate processing.
if ($batch['progressive']) {
// Now that we have a batch id, we can generate the redirection link in
// the generic error message.
$t = get_t();
$batch['error_message'] = $t('Please continue to <a href="@error_url">the error page</a>', array('@error_url' => url($url, array('query' => array('id' => $batch['id'], 'op' => 'finished')))));
// Clear the way for the drupal_goto() redirection to the batch processing
// page, by saving and unsetting the 'destination', if there is any.
if (isset($_GET['destination'])) {
$batch['destination'] = $_GET['destination'];
unset($_GET['destination']);
}
// Store the batch.
db_insert('batch')
->fields(array(
'bid' => $batch['id'],
'timestamp' => REQUEST_TIME,
'token' => drupal_get_token($batch['id']),
'batch' => serialize($batch),
))
->execute();
// Set the batch number in the session to guarantee that it will stay alive.
$_SESSION['batches'][$batch['id']] = TRUE;
// Redirect for processing.
$function = $batch['redirect_callback'];
if (function_exists($function)) {
$function($batch['url'], array('query' => array('op' => 'start', 'id' => $batch['id'])));
}
}
else {
// Non-progressive execution: bypass the whole progressbar workflow
// and execute the batch in one pass.
require_once DRUPAL_ROOT . '/includes/batch.inc';
_batch_process();
}
}
}
/**
* Retrieves the current batch.
*/
function &batch_get() {
// Not drupal_static(), because Batch API operates at a lower level than most
// use-cases for resetting static variables, and we specifically do not want a
// global drupal_static_reset() resetting the batch information. Functions
// that are part of the Batch API and need to reset the batch information may
// call batch_get() and manipulate the result by reference. Functions that are
// not part of the Batch API can also do this, but shouldn't.
static $batch = array();
return $batch;
}
/**
* Populates a job queue with the operations of a batch set.
*
* Depending on whether the batch is progressive or not, the BatchQueue or
* BatchMemoryQueue handler classes will be used.
*
* @param $batch
* The batch array.
* @param $set_id
* The id of the set to process.
* @return
* The name and class of the queue are added by reference to the batch set.
*/
function _batch_populate_queue(&$batch, $set_id) {
$batch_set = &$batch['sets'][$set_id];
if (isset($batch_set['operations'])) {
$batch_set += array(
'queue' => array(
'name' => 'drupal_batch:' . $batch['id'] . ':' . $set_id,
'class' => $batch['progressive'] ? 'BatchQueue' : 'BatchMemoryQueue',
),
);
$queue = _batch_queue($batch_set);
$queue->createQueue();
foreach ($batch_set['operations'] as $operation) {
$queue->createItem($operation);
}
unset($batch_set['operations']);
}
}
/**
* Returns a queue object for a batch set.
*
* @param $batch_set
* The batch set.
* @return
* The queue object.
*/
function _batch_queue($batch_set) {
static $queues;
// The class autoloader is not available when running update.php, so make
// sure the files are manually included.
if (!isset($queues)) {
$queues = array();
require_once DRUPAL_ROOT . '/modules/system/system.queue.inc';
require_once DRUPAL_ROOT . '/includes/batch.queue.inc';
}
if (isset($batch_set['queue'])) {
$name = $batch_set['queue']['name'];
$class = $batch_set['queue']['class'];
if (!isset($queues[$class][$name])) {
$queues[$class][$name] = new $class($name);
}
return $queues[$class][$name];
}
}
/**
* @} End of "defgroup batch".
*/
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