Truncate string on a word boundary

README.txt

Views Exposed Forms Ajax Support
================================

Adds #ajax support to Views Exposed Forms. 
Since Views Exposed Forms are $_GET forms only, #ajax callbacks won't work there by default.
This module adds this ability. Just enable it and create your #ajax callbacks for any exposed form
element.

This module is the adopted version of the patch here: https://drupal.org/node/1183418, hopefully it will
be submitted to Views soon and you won't need this module anymore, but for now it will save you.

smart_truncate

def smart_truncate(content, length=100, suffix='...'):
    if len(content) <= length:
        return content
    else:
        return ' '.join(content[:length+1].split(' ')[0:-1]) + suffixes

vef_ajax.info

name = Views Exposed Forms Ajax Support
description = Adds Ajax Support to Views Exposed Forms
dependencies[] = views
package = views
core = 7.x

vef_ajax.module

<?php
/**
 * @file vef_ajax.module
 * TODO: Enter file description here.
 */

/**
 * Implement hook_form_alter for the exposed form.
 *
 * Since the exposed form is a GET form, we don't want it to send a wide
 * variety of information.
 */
function vef_ajax_form_views_exposed_form_alter(&$form, &$form_state) {
  $form['form_build_id']['#access'] = FALSE;
  $form['form_token']['#access'] = FALSE;
  $form['form_id']['#access'] = FALSE;
  // AJAX behaviors need these data, so we add it back in #after_build.
  $form['#after_build'][] = 'vef_ajax_exposed_form_ajax_enable';
}

/**
 * Checks whether the exposed form will use ajax and passes required
 * form information removed in views_form_views_exposed_form_alter().
 */
function vef_ajax_exposed_form_ajax_enable(&$form, &$form_state) {
  // In order for Ajax to work, we need the form build info. Here we
  // check if #ajax has been added to any form elements, and if so,
  // pass this info as settings via Javascript, which get attached to
  // the submitted form on Ajax form submissions.
  // #ajax property can be set not only for the first level of the form,
  // so we look for it in the whole form.
  $ajax_info = array();
  $ajax_elements = vef_ajax_exposed_form_ajax_lookup_recursive($form);
  // Determine if form is being processed.
  $triggering_element_name = '';
  if (!empty($form_state['input']['_triggering_element_name'])) {
    $triggering_element_name = $form_state['input']['_triggering_element_name'];
  }
  // When we have multiple elements with #ajax set on exposed form
  // we need to pass only triggering element name to Javascript.
  // Otherwise #ajax will work only for the first element.
  if (!empty($triggering_element_name) && !empty($ajax_elements)) {
    // Check if element has #ajax property set.
    if (in_array($triggering_element_name, $ajax_elements)) {
      $ajax_elements = array(
        $triggering_element_name => $triggering_element_name,
      );
    }
    else {
      $ajax_elements = array();
    }
  }
  if (!empty($ajax_elements)) {
    $form_info = array(
      'form_id' => $form['#form_id'],
      'form_build_id' => $form['#build_id'],
    );
    // Anonymous users don't get a token.
    if (!empty($form['#token'])) {
      $form_info['form_token'] = $form['#token'];
    }
    foreach ($ajax_elements as $element_name) {
      $ajax_info[$element_name] = $form_info;
    }
    $form['#attached']['js'][] = array(
      'type' => 'setting',
      'data' => array(
        'ViewsExposedFormInfo' => $ajax_info,
      ),
    );
    // Add the javascript behavior that will handle this data.
    $form['#attached']['js'][] = array(
      'weight' => 100,
      'data' => drupal_get_path('module', 'vef_ajax') . '/js/exposed-form-ajax.js',
    );
  }
  return $form;
}

/**
 * Recursively looks for the #ajax property for every form elemet.
 * @param $elements
 *   The element array to look for #ajax property.
 *
 * @return
 *   Array of the elements names where #ajax was found.
 */
function vef_ajax_exposed_form_ajax_lookup_recursive($elements) {
  $ajax_elements = array();
  foreach (element_children($elements) as $key) {
    if (!empty($elements[$key]['#name']) && !empty($elements[$key]['#ajax'])) {
      $ajax_elements[$elements[$key]['#name']] = $elements[$key]['#name'];
    }
    // Recursive call to look for #ajax in element's childrens.
    $ajax_elements += vef_ajax_exposed_form_ajax_lookup_recursive($elements[$key]);
  }
  return $ajax_elements;
}