Skip to content

Instantly share code, notes, and snippets.

@SteveSanderson

SteveSanderson/gist:5133220

Created March 11, 2013 10:10
Show Gist options
  • Save SteveSanderson/5133220 to your computer and use it in GitHub Desktop.
Save SteveSanderson/5133220 to your computer and use it in GitHub Desktop.
Download ZIP
Raw
gistfile1.js
// Knockout JavaScript library v2.2.0
// (c) Steven Sanderson - http://knockoutjs.com/
// License: MIT (http://www.opensource.org/licenses/mit-license.php)
(function(){
var DEBUG=true;
(function(window,document,navigator,jQuery,undefined){
!function(factory) {
// Support three module loading scenarios
if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
// [1] CommonJS/Node.js
var target = module['exports'] || exports; // module.exports is for Node.js
factory(target);
} else if (typeof define === 'function' && define['amd']) {
// [2] AMD anonymous module
define(['exports'], factory);
} else {
// [3] No module loader (plain <script> tag) - put directly in global namespace
factory(window['ko'] = {});
}
}(function(koExports){
// Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
// In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
var ko = typeof koExports !== 'undefined' ? koExports : {};
// Google Closure Compiler helpers (used only to make the minified file smaller)
ko.exportSymbol = function(koPath, object) {
var tokens = koPath.split(".");
// In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
// At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
var target = ko;
for (var i = 0; i < tokens.length - 1; i++)
target = target[tokens[i]];
target[tokens[tokens.length - 1]] = object;
};
ko.exportProperty = function(owner, publicName, object) {
owner[publicName] = object;
};
ko.version = "2.2.0";
ko.exportSymbol('version', ko.version);
ko.utils = new (function () {
var stringTrimRegex = /^(\s|\u00A0)+|(\s|\u00A0)+$/g;
// Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
var knownEvents = {}, knownEventTypesByEventName = {};
var keyEventTypeName = /Firefox\/2/i.test(navigator.userAgent) ? 'KeyboardEvent' : 'UIEvents';
knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
for (var eventType in knownEvents) {
var knownEventsForType = knownEvents[eventType];
if (knownEventsForType.length) {
for (var i = 0, j = knownEventsForType.length; i < j; i++)
knownEventTypesByEventName[knownEventsForType[i]] = eventType;
}
}
var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406
// Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
// Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.
// Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.
// If there is a future need to detect specific versions of IE10+, we will amend this.
var ieVersion = (function() {
var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');
// Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
while (
div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
iElems[0]
);
return version > 4 ? version : undefined;
}());
var isIe6 = ieVersion === 6,
isIe7 = ieVersion === 7;
function isClickOnCheckableElement(element, eventType) {
if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
if (eventType.toLowerCase() != "click") return false;
var inputType = element.type;
return (inputType == "checkbox") || (inputType == "radio");
}
return {
fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
arrayForEach: function (array, action) {
for (var i = 0, j = array.length; i < j; i++)
action(array[i]);
},
arrayIndexOf: function (array, item) {
if (typeof Array.prototype.indexOf == "function")
return Array.prototype.indexOf.call(array, item);
for (var i = 0, j = array.length; i < j; i++)
if (array[i] === item)
return i;
return -1;
},
arrayFirst: function (array, predicate, predicateOwner) {
for (var i = 0, j = array.length; i < j; i++)
if (predicate.call(predicateOwner, array[i]))
return array[i];
return null;
},
arrayRemoveItem: function (array, itemToRemove) {
var index = ko.utils.arrayIndexOf(array, itemToRemove);
if (index >= 0)
array.splice(index, 1);
},
arrayGetDistinctValues: function (array) {
array = array || [];
var result = [];
for (var i = 0, j = array.length; i < j; i++) {
if (ko.utils.arrayIndexOf(result, array[i]) < 0)
result.push(array[i]);
}
return result;
},
arrayMap: function (array, mapping) {
array = array || [];
var result = [];
for (var i = 0, j = array.length; i < j; i++)
result.push(mapping(array[i]));
return result;
},
arrayFilter: function (array, predicate) {
array = array || [];
var result = [];
for (var i = 0, j = array.length; i < j; i++)
if (predicate(array[i]))
result.push(array[i]);
return result;
},
arrayPushAll: function (array, valuesToPush) {
if (valuesToPush instanceof Array)
array.push.apply(array, valuesToPush);
else
for (var i = 0, j = valuesToPush.length; i < j; i++)
array.push(valuesToPush[i]);
return array;
},
addOrRemoveItem: function(array, value, included) {
var existingEntryIndex = array.indexOf ? array.indexOf(value) : utils.arrayIndexOf(array, value);
if (existingEntryIndex < 0) {
if (included)
array.push(value);
} else {
if (!included)
array.splice(existingEntryIndex, 1);
}
},
extend: function (target, source) {
if (source) {
for(var prop in source) {
if(source.hasOwnProperty(prop)) {
target[prop] = source[prop];
}
}
}
return target;
},
emptyDomNode: function (domNode) {
while (domNode.firstChild) {
ko.removeNode(domNode.firstChild);
}
},
moveCleanedNodesToContainerElement: function(nodes) {
// Ensure it's a real array, as we're about to reparent the nodes and
// we don't want the underlying collection to change while we're doing that.
var nodesArray = ko.utils.makeArray(nodes);
var container = document.createElement('div');
for (var i = 0, j = nodesArray.length; i < j; i++) {
container.appendChild(ko.cleanNode(nodesArray[i]));
}
return container;
},
cloneNodes: function (nodesArray, shouldCleanNodes) {
for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {
var clonedNode = nodesArray[i].cloneNode(true);
newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);
}
return newNodesArray;
},
setDomNodeChildren: function (domNode, childNodes) {
ko.utils.emptyDomNode(domNode);
if (childNodes) {
for (var i = 0, j = childNodes.length; i < j; i++)
domNode.appendChild(childNodes[i]);
}
},
replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
if (nodesToReplaceArray.length > 0) {
var insertionPoint = nodesToReplaceArray[0];
var parent = insertionPoint.parentNode;
for (var i = 0, j = newNodesArray.length; i < j; i++)
parent.insertBefore(newNodesArray[i], insertionPoint);
for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
ko.removeNode(nodesToReplaceArray[i]);
}
}
},
setOptionNodeSelectionState: function (optionNode, isSelected) {
// IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
if (ieVersion < 7)
optionNode.setAttribute("selected", isSelected);
else
optionNode.selected = isSelected;
},
stringTrim: function (string) {
return (string || "").replace(stringTrimRegex, "");
},
stringTokenize: function (string, delimiter) {
var result = [];
var tokens = (string || "").split(delimiter);
for (var i = 0, j = tokens.length; i < j; i++) {
var trimmed = ko.utils.stringTrim(tokens[i]);
if (trimmed !== "")
result.push(trimmed);
}
return result;
},
stringStartsWith: function (string, startsWith) {
string = string || "";
if (startsWith.length > string.length)
return false;
return string.substring(0, startsWith.length) === startsWith;
},
domNodeIsContainedBy: function (node, containedByNode) {
if (containedByNode.compareDocumentPosition)
return (containedByNode.compareDocumentPosition(node) & 16) == 16;
while (node != null) {
if (node == containedByNode)
return true;
node = node.parentNode;
}
return false;
},
domNodeIsAttachedToDocument: function (node) {
return ko.utils.domNodeIsContainedBy(node, node.ownerDocument);
},
anyDomNodeIsAttachedToDocument: function(nodes) {
return !!ko.utils.arrayFirst(nodes, ko.utils.domNodeIsAttachedToDocument);
},
tagNameLower: function(element) {
// For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
// Possible future optimization: If we know it's an element from an XHTML document (not HTML),
// we don't need to do the .toLowerCase() as it will always be lower case anyway.
return element && element.tagName && element.tagName.toLowerCase();
},
registerEventHandler: function (element, eventType, handler) {
var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
if (!mustUseAttachEvent && typeof jQuery != "undefined") {
if (isClickOnCheckableElement(element, eventType)) {
// For click events on checkboxes, jQuery interferes with the event handling in an awkward way:
// it toggles the element checked state *after* the click event handlers run, whereas native
// click events toggle the checked state *before* the event handler.
// Fix this by intecepting the handler and applying the correct checkedness before it runs.
var originalHandler = handler;
handler = function(event, eventData) {
var jQuerySuppliedCheckedState = this.checked;
if (eventData)
this.checked = eventData.checkedStateBeforeEvent !== true;
originalHandler.call(this, event);
this.checked = jQuerySuppliedCheckedState; // Restore the state jQuery applied
};
}
jQuery(element)['bind'](eventType, handler);
} else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
element.addEventListener(eventType, handler, false);
else if (typeof element.attachEvent != "undefined")
element.attachEvent("on" + eventType, function (event) {
handler.call(element, event);
});
else
throw new Error("Browser doesn't support addEventListener or attachEvent");
},
triggerEvent: function (element, eventType) {
if (!(element && element.nodeType))
throw new Error("element must be a DOM node when calling triggerEvent");
if (typeof jQuery != "undefined") {
var eventData = [];
if (isClickOnCheckableElement(element, eventType)) {
// Work around the jQuery "click events on checkboxes" issue described above by storing the original checked state before triggering the handler
eventData.push({ checkedStateBeforeEvent: element.checked });
}
jQuery(element)['trigger'](eventType, eventData);
} else if (typeof document.createEvent == "function") {
if (typeof element.dispatchEvent == "function") {
var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
var event = document.createEvent(eventCategory);
event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
element.dispatchEvent(event);
}
else
throw new Error("The supplied element doesn't support dispatchEvent");
} else if (typeof element.fireEvent != "undefined") {
// Unlike other browsers, IE doesn't change the checked state of checkboxes/radiobuttons when you trigger their "click" event
// so to make it consistent, we'll do it manually here
if (isClickOnCheckableElement(element, eventType))
element.checked = element.checked !== true;
element.fireEvent("on" + eventType);
}
else
throw new Error("Browser doesn't support triggering events");
},
unwrapObservable: function (value) {
return ko.isObservable(value) ? value() : value;
},
peekObservable: function (value) {
return ko.isObservable(value) ? value.peek() : value;
},
toggleDomNodeCssClass: function (node, classNames, shouldHaveClass) {
if (classNames) {
var cssClassNameRegex = /\S+/g,
currentClassNames = node.className.match(cssClassNameRegex) || [];
ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);
});
node.className = currentClassNames.join(" ");
}
},
setTextContent: function(element, textContent) {
var value = ko.utils.unwrapObservable(textContent);
if ((value === null) || (value === undefined))
value = "";
if (element.nodeType === 3) {
element.data = value;
} else {
// We need there to be exactly one child: a text node.
// If there are no children, more than one, or if it's not a text node,
// we'll clear everything and create a single text node.
var innerTextNode = ko.virtualElements.firstChild(element);
if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {
ko.virtualElements.setDomNodeChildren(element, [document.createTextNode(value)]);
} else {
innerTextNode.data = value;
}
ko.utils.forceRefresh(element);
}
},
setElementName: function(element, name) {
element.name = name;
// Workaround IE 6/7 issue
// - https://github.com/SteveSanderson/knockout/issues/197
// - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
if (ieVersion <= 7) {
try {
element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);
}
catch(e) {} // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"
}
},
forceRefresh: function(node) {
// Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209
if (ieVersion >= 9) {
// For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container
var elem = node.nodeType == 1 ? node : node.parentNode;
if (elem.style)
elem.style.zoom = elem.style.zoom;
}
},
ensureSelectElementIsRenderedCorrectly: function(selectElement) {
// Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
// (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
if (ieVersion >= 9) {
var originalWidth = selectElement.style.width;
selectElement.style.width = 0;
selectElement.style.width = originalWidth;
}
},
range: function (min, max) {
min = ko.utils.unwrapObservable(min);
max = ko.utils.unwrapObservable(max);
var result = [];
for (var i = min; i <= max; i++)
result.push(i);
return result;
},
makeArray: function(arrayLikeObject) {
var result = [];
for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
result.push(arrayLikeObject[i]);
};
return result;
},
isIe6 : isIe6,
isIe7 : isIe7,
ieVersion : ieVersion,
getFormFields: function(form, fieldName) {
var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
var isMatchingField = (typeof fieldName == 'string')
? function(field) { return field.name === fieldName }
: function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
var matches = [];
for (var i = fields.length - 1; i >= 0; i--) {
if (isMatchingField(fields[i]))
matches.push(fields[i]);
};
return matches;
},
parseJson: function (jsonString) {
if (typeof jsonString == "string") {
jsonString = ko.utils.stringTrim(jsonString);
if (jsonString) {
if (window.JSON && window.JSON.parse) // Use native parsing where available
return window.JSON.parse(jsonString);
return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
}
}
return null;
},
stringifyJson: function (data, replacer, space) { // replacer and space are optional
if ((typeof JSON == "undefined") || (typeof JSON.stringify == "undefined"))
throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
},
postJson: function (urlOrForm, data, options) {
options = options || {};
var params = options['params'] || {};
var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
var url = urlOrForm;
// If we were given a form, use its 'action' URL and pick out any requested field values
if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
var originalForm = urlOrForm;
url = originalForm.action;
for (var i = includeFields.length - 1; i >= 0; i--) {
var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
for (var j = fields.length - 1; j >= 0; j--)
params[fields[j].name] = fields[j].value;
}
}
data = ko.utils.unwrapObservable(data);
var form = document.createElement("form");
form.style.display = "none";
form.action = url;
form.method = "post";
for (var key in data) {
var input = document.createElement("input");
input.name = key;
input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
form.appendChild(input);
}
for (var key in params) {
var input = document.createElement("input");
input.name = key;
input.value = params[key];
form.appendChild(input);
}
document.body.appendChild(form);
options['submitter'] ? options['submitter'](form) : form.submit();
setTimeout(function () { form.parentNode.removeChild(form); }, 0);
}
}
})();
ko.exportSymbol('utils', ko.utils);
ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
ko.exportSymbol('utils.extend', ko.utils.extend);
ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);
ko.exportSymbol('utils.postJson', ko.utils.postJson);
ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
ko.exportSymbol('utils.range', ko.utils.range);
ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);
if (!Function.prototype['bind']) {
// Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
// In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
Function.prototype['bind'] = function (object) {
var originalFunction = this, args = Array.prototype.slice.call(arguments), object = args.shift();
return function () {
return originalFunction.apply(object, args.concat(Array.prototype.slice.call(arguments)));
};
};
}
ko.utils.domData = new (function () {
var uniqueId = 0;
var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
var dataStore = {};
return {
get: function (node, key) {
var allDataForNode = ko.utils.domData.getAll(node, false);
return allDataForNode === undefined ? undefined : allDataForNode[key];
},
set: function (node, key, value) {
if (value === undefined) {
// Make sure we don't actually create a new domData key if we are actually deleting a value
if (ko.utils.domData.getAll(node, false) === undefined)
return;
}
var allDataForNode = ko.utils.domData.getAll(node, true);
allDataForNode[key] = value;
},
getAll: function (node, createIfNotFound) {
var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
if (!hasExistingDataStore) {
if (!createIfNotFound)
return undefined;
dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
dataStore[dataStoreKey] = {};
}
return dataStore[dataStoreKey];
},
clear: function (node) {
var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
if (dataStoreKey) {
delete dataStore[dataStoreKey];
node[dataStoreKeyExpandoPropertyName] = null;
return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
}
return false;
}
}
})();
ko.exportSymbol('utils.domData', ko.utils.domData);
ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully
ko.utils.domNodeDisposal = new (function () {
var domDataKey = "__ko_domNodeDisposal__" + (new Date).getTime();
var cleanableNodeTypes = { 1: true, 8: true, 9: true }; // Element, Comment, Document
var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document
function getDisposeCallbacksCollection(node, createIfNotFound) {
var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
if ((allDisposeCallbacks === undefined) && createIfNotFound) {
allDisposeCallbacks = [];
ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
}
return allDisposeCallbacks;
}
function destroyCallbacksCollection(node) {
ko.utils.domData.set(node, domDataKey, undefined);
}
function cleanSingleNode(node) {
// Run all the dispose callbacks
var callbacks = getDisposeCallbacksCollection(node, false);
if (callbacks) {
callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
for (var i = 0; i < callbacks.length; i++)
callbacks[i](node);
}
// Also erase the DOM data
ko.utils.domData.clear(node);
// Special support for jQuery here because it's so commonly used.
// Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
// so notify it to tear down any resources associated with the node & descendants here.
if ((typeof jQuery == "function") && (typeof jQuery['cleanData'] == "function"))
jQuery['cleanData']([node]);
// Also clear any immediate-child comment nodes, as these wouldn't have been found by
// node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
if (cleanableNodeTypesWithDescendants[node.nodeType])
cleanImmediateCommentTypeChildren(node);
}
function cleanImmediateCommentTypeChildren(nodeWithChildren) {
var child, nextChild = nodeWithChildren.firstChild;
while (child = nextChild) {
nextChild = child.nextSibling;
if (child.nodeType === 8)
cleanSingleNode(child);
}
}
return {
addDisposeCallback : function(node, callback) {
if (typeof callback != "function")
throw new Error("Callback must be a function");
getDisposeCallbacksCollection(node, true).push(callback);
},
removeDisposeCallback : function(node, callback) {
var callbacksCollection = getDisposeCallbacksCollection(node, false);
if (callbacksCollection) {
ko.utils.arrayRemoveItem(callbacksCollection, callback);
if (callbacksCollection.length == 0)
destroyCallbacksCollection(node);
}
},
cleanNode : function(node) {
// First clean this node, where applicable
if (cleanableNodeTypes[node.nodeType]) {
cleanSingleNode(node);
// ... then its descendants, where applicable
if (cleanableNodeTypesWithDescendants[node.nodeType]) {
// Clone the descendants list in case it changes during iteration
var descendants = [];
ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));
for (var i = 0, j = descendants.length; i < j; i++)
cleanSingleNode(descendants[i]);
}
}
return node;
},
removeNode : function(node) {
ko.cleanNode(node);
if (node.parentNode)
node.parentNode.removeChild(node);
}
}
})();
ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
ko.exportSymbol('cleanNode', ko.cleanNode);
ko.exportSymbol('removeNode', ko.removeNode);
ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
(function () {
var leadingCommentRegex = /^(\s*)<!--(.*?)-->/;
function simpleHtmlParse(html) {
// Based on jQuery's "clean" function, but only accounting for table-related elements.
// If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly
// Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
// a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
// This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
// (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.
// Trim whitespace, otherwise indexOf won't work as expected
var tags = ko.utils.stringTrim(html).toLowerCase(), div = document.createElement("div");
// Finds the first match from the left column, and returns the corresponding "wrap" data from the right column
var wrap = tags.match(/^<(thead|tbody|tfoot)/) && [1, "<table>", "</table>"] ||
!tags.indexOf("<tr") && [2, "<table><tbody>", "</tbody></table>"] ||
(!tags.indexOf("<td") || !tags.indexOf("<th")) && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
/* anything else */ [0, "", ""];
// Go to html and back, then peel off extra wrappers
// Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
if (typeof window['innerShiv'] == "function") {
div.appendChild(window['innerShiv'](markup));
} else {
div.innerHTML = markup;
}
// Move to the right depth
while (wrap[0]--)
div = div.lastChild;
return ko.utils.makeArray(div.lastChild.childNodes);
}
function jQueryHtmlParse(html) {
// jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
if (jQuery['parseHTML']) {
return jQuery['parseHTML'](html) || []; // Ensure we always return an array and never null
} else {
// For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function.
var elems = jQuery['clean']([html]);
// As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
// Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
// Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
if (elems && elems[0]) {
// Find the top-most parent element that's a direct child of a document fragment
var elem = elems[0];
while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
elem = elem.parentNode;
// ... then detach it
if (elem.parentNode)
elem.parentNode.removeChild(elem);
}
return elems;
}
}
ko.utils.parseHtmlFragment = function(html) {
return typeof jQuery != 'undefined' ? jQueryHtmlParse(html) // As below, benefit from jQuery's optimisations where possible
: simpleHtmlParse(html); // ... otherwise, this simple logic will do in most common cases.
};
ko.utils.setHtml = function(node, html) {
ko.utils.emptyDomNode(node);
// There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
html = ko.utils.unwrapObservable(html);
if ((html !== null) && (html !== undefined)) {
if (typeof html != 'string')
html = html.toString();
// jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
// for example <tr> elements which are not normally allowed to exist on their own.
// If you've referenced jQuery we'll use that rather than duplicating its code.
if (typeof jQuery != 'undefined') {
jQuery(node)['html'](html);
} else {
// ... otherwise, use KO's own parsing logic.
var parsedNodes = ko.utils.parseHtmlFragment(html);
for (var i = 0; i < parsedNodes.length; i++)
node.appendChild(parsedNodes[i]);
}
}
};
})();
ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
ko.exportSymbol('utils.setHtml', ko.utils.setHtml);
ko.memoization = (function () {
var memos = {};
function randomMax8HexChars() {
return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
}
function generateRandomId() {
return randomMax8HexChars() + randomMax8HexChars();
}
function findMemoNodes(rootNode, appendToArray) {
if (!rootNode)
return;
if (rootNode.nodeType == 8) {
var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
if (memoId != null)
appendToArray.push({ domNode: rootNode, memoId: memoId });
} else if (rootNode.nodeType == 1) {
for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
findMemoNodes(childNodes[i], appendToArray);
}
}
return {
memoize: function (callback) {
if (typeof callback != "function")
throw new Error("You can only pass a function to ko.memoization.memoize()");
var memoId = generateRandomId();
memos[memoId] = callback;
return "<!--[ko_memo:" + memoId + "]-->";
},
unmemoize: function (memoId, callbackParams) {
var callback = memos[memoId];
if (callback === undefined)
throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
try {
callback.apply(null, callbackParams || []);
return true;
}
finally { delete memos[memoId]; }
},
unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
var memos = [];
findMemoNodes(domNode, memos);
for (var i = 0, j = memos.length; i < j; i++) {
var node = memos[i].domNode;
var combinedParams = [node];
if (extraCallbackParamsArray)
ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
ko.memoization.unmemoize(memos[i].memoId, combinedParams);
node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
if (node.parentNode)
node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
}
},
parseMemoText: function (memoText) {
var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
return match ? match[1] : null;
}
};
})();
ko.exportSymbol('memoization', ko.memoization);
ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
ko.extenders = {
'throttle': function(target, timeout) {
// Throttling means two things:
// (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
// notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
target['throttleEvaluation'] = timeout;
// (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
// so the target cannot change value synchronously or faster than a certain rate
var writeTimeoutInstance = null;
return ko.dependentObservable({
'read': target,
'write': function(value) {
clearTimeout(writeTimeoutInstance);
writeTimeoutInstance = setTimeout(function() {
target(value);
}, timeout);
}
});
},
'notify': function(target, notifyWhen) {
target["equalityComparer"] = notifyWhen == "always"
? function() { return false } // Treat all values as not equal
: ko.observable["fn"]["equalityComparer"];
return target;
}
};
function applyExtenders(requestedExtenders) {
var target = this;
if (requestedExtenders) {
for (var key in requestedExtenders) {
var extenderHandler = ko.extenders[key];
if (typeof extenderHandler == 'function') {
target = extenderHandler(target, requestedExtenders[key]);
}
}
}
return target;
}
ko.exportSymbol('extenders', ko.extenders);
ko.subscription = function (target, callback, disposeCallback) {
this.target = target;
this.callback = callback;
this.disposeCallback = disposeCallback;
ko.exportProperty(this, 'dispose', this.dispose);
};
ko.subscription.prototype.dispose = function () {
this.isDisposed = true;
this.disposeCallback();
};
ko.subscribable = function () {
this._subscriptions = {};
ko.utils.extend(this, ko.subscribable['fn']);
ko.exportProperty(this, 'subscribe', this.subscribe);
ko.exportProperty(this, 'extend', this.extend);
ko.exportProperty(this, 'getSubscriptionsCount', this.getSubscriptionsCount);
}
var defaultEvent = "change";
ko.subscribable['fn'] = {
subscribe: function (callback, callbackTarget, event) {
event = event || defaultEvent;
var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
var subscription = new ko.subscription(this, boundCallback, function () {
ko.utils.arrayRemoveItem(this._subscriptions[event], subscription);
}.bind(this));
if (!this._subscriptions[event])
this._subscriptions[event] = [];
this._subscriptions[event].push(subscription);
return subscription;
},
"notifySubscribers": function (valueToNotify, event) {
event = event || defaultEvent;
if (this._subscriptions[event]) {
ko.dependencyDetection.ignore(function() {
ko.utils.arrayForEach(this._subscriptions[event].slice(0), function (subscription) {
// In case a subscription was disposed during the arrayForEach cycle, check
// for isDisposed on each subscription before invoking its callback
if (subscription && (subscription.isDisposed !== true))
subscription.callback(valueToNotify);
});
}, this);
}
},
getSubscriptionsCount: function () {
var total = 0;
for (var eventName in this._subscriptions) {
if (this._subscriptions.hasOwnProperty(eventName))
total += this._subscriptions[eventName].length;
}
return total;
},
extend: applyExtenders
};
ko.isSubscribable = function (instance) {
return typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
};
ko.exportSymbol('subscribable', ko.subscribable);
ko.exportSymbol('isSubscribable', ko.isSubscribable);
ko.dependencyDetection = (function () {
var _frames = [];
return {
begin: function (callback) {
_frames.push({ callback: callback, distinctDependencies:[] });
},
end: function () {
_frames.pop();
},
registerDependency: function (subscribable) {
if (!ko.isSubscribable(subscribable))
throw new Error("Only subscribable things can act as dependencies");
if (_frames.length > 0) {
var topFrame = _frames[_frames.length - 1];
if (!topFrame || ko.utils.arrayIndexOf(topFrame.distinctDependencies, subscribable) >= 0)
return;
topFrame.distinctDependencies.push(subscribable);
topFrame.callback(subscribable);
}
},
ignore: function(callback, callbackTarget, callbackArgs) {
try {
_frames.push(null);
return callback.apply(callbackTarget, callbackArgs || []);
} finally {
_frames.pop();
}
}
};
})();
var primitiveTypes = { 'undefined':true, 'boolean':true, 'number':true, 'string':true };
ko.observable = function (initialValue) {
var _latestValue = initialValue;
function observable() {
if (arguments.length > 0) {
// Write
// Ignore writes if the value hasn't changed
if ((!observable['equalityComparer']) || !observable['equalityComparer'](_latestValue, arguments[0])) {
observable.valueWillMutate();
_latestValue = arguments[0];
if (DEBUG) observable._latestValue = _latestValue;
observable.valueHasMutated();
}
return this; // Permits chained assignments
}
else {
// Read
ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
return _latestValue;
}
}
if (DEBUG) observable._latestValue = _latestValue;
ko.subscribable.call(observable);
observable.peek = function() { return _latestValue };
observable.valueHasMutated = function () { observable["notifySubscribers"](_latestValue); }
observable.valueWillMutate = function () { observable["notifySubscribers"](_latestValue, "beforeChange"); }
ko.utils.extend(observable, ko.observable['fn']);
ko.exportProperty(observable, 'peek', observable.peek);
ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);
ko.exportProperty(observable, "valueWillMutate", observable.valueWillMutate);
return observable;
}
ko.observable['fn'] = {
"equalityComparer": function valuesArePrimitiveAndEqual(a, b) {
var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);
return oldValueIsPrimitive ? (a === b) : false;
}
};
var protoProperty = ko.observable.protoProperty = "__ko_proto__";
ko.observable['fn'][protoProperty] = ko.observable;
ko.hasPrototype = function(instance, prototype) {
if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;
if (instance[protoProperty] === prototype) return true;
return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain
};
ko.isObservable = function (instance) {
return ko.hasPrototype(instance, ko.observable);
}
ko.isWriteableObservable = function (instance) {
// Observable
if ((typeof instance == "function") && instance[protoProperty] === ko.observable)
return true;
// Writeable dependent observable
if ((typeof instance == "function") && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))
return true;
// Anything else
return false;
}
ko.exportSymbol('observable', ko.observable);
ko.exportSymbol('isObservable', ko.isObservable);
ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
ko.observableArray = function (initialValues) {
if (arguments.length == 0) {
// Zero-parameter constructor initializes to empty array
initialValues = [];
}
if ((initialValues !== null) && (initialValues !== undefined) && !('length' in initialValues))
throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
var result = ko.observable(initialValues);
ko.utils.extend(result, ko.observableArray['fn']);
return result;
}
ko.observableArray['fn'] = {
'remove': function (valueOrPredicate) {
var underlyingArray = this.peek();
var removedValues = [];
var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
for (var i = 0; i < underlyingArray.length; i++) {
var value = underlyingArray[i];
if (predicate(value)) {
if (removedValues.length === 0) {
this.valueWillMutate();
}
removedValues.push(value);
underlyingArray.splice(i, 1);
i--;
}
}
if (removedValues.length) {
this.valueHasMutated();
}
return removedValues;
},
'removeAll': function (arrayOfValues) {
// If you passed zero args, we remove everything
if (arrayOfValues === undefined) {
var underlyingArray = this.peek();
var allValues = underlyingArray.slice(0);
this.valueWillMutate();
underlyingArray.splice(0, underlyingArray.length);
this.valueHasMutated();
return allValues;
}
// If you passed an arg, we interpret it as an array of entries to remove
if (!arrayOfValues)
return [];
return this['remove'](function (value) {
return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
});
},
'destroy': function (valueOrPredicate) {
var underlyingArray = this.peek();
var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
this.valueWillMutate();
for (var i = underlyingArray.length - 1; i >= 0; i--) {
var value = underlyingArray[i];
if (predicate(value))
underlyingArray[i]["_destroy"] = true;
}
this.valueHasMutated();
},
'destroyAll': function (arrayOfValues) {
// If you passed zero args, we destroy everything
if (arrayOfValues === undefined)
return this['destroy'](function() { return true });
// If you passed an arg, we interpret it as an array of entries to destroy
if (!arrayOfValues)
return [];
return this['destroy'](function (value) {
return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
});
},
'indexOf': function (item) {
var underlyingArray = this();
return ko.utils.arrayIndexOf(underlyingArray, item);
},
'replace': function(oldItem, newItem) {
var index = this['indexOf'](oldItem);
if (index >= 0) {
this.valueWillMutate();
this.peek()[index] = newItem;
this.valueHasMutated();
}
}
}
// Populate ko.observableArray.fn with read/write functions from native arrays
// Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
// because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
ko.observableArray['fn'][methodName] = function () {
// Use "peek" to avoid creating a subscription in any computed that we're executing in the context of
// (for consistency with mutating regular observables)
var underlyingArray = this.peek();
this.valueWillMutate();
var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
this.valueHasMutated();
return methodCallResult;
};
});
// Populate ko.observableArray.fn with read-only functions from native arrays
ko.utils.arrayForEach(["slice"], function (methodName) {
ko.observableArray['fn'][methodName] = function () {
var underlyingArray = this();
return underlyingArray[methodName].apply(underlyingArray, arguments);
};
});
ko.exportSymbol('observableArray', ko.observableArray);
ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
var _latestValue,
_hasBeenEvaluated = false,
_isBeingEvaluated = false,
readFunction = evaluatorFunctionOrOptions;
if (readFunction && typeof readFunction == "object") {
// Single-parameter syntax - everything is on this "options" param
options = readFunction;
readFunction = options["read"];
} else {
// Multi-parameter syntax - construct the options according to the params passed
options = options || {};
if (!readFunction)
readFunction = options["read"];
}
if (typeof readFunction != "function")
throw new Error("Pass a function that returns the value of the ko.computed");
function addSubscriptionToDependency(subscribable) {
_subscriptionsToDependencies.push(subscribable.subscribe(evaluatePossiblyAsync));
}
function disposeAllSubscriptionsToDependencies() {
ko.utils.arrayForEach(_subscriptionsToDependencies, function (subscription) {
subscription.dispose();
});
_subscriptionsToDependencies = [];
}
function evaluatePossiblyAsync() {
var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
clearTimeout(evaluationTimeoutInstance);
evaluationTimeoutInstance = setTimeout(evaluateImmediate, throttleEvaluationTimeout);
} else
evaluateImmediate();
}
function evaluateImmediate() {
if (_isBeingEvaluated) {
// If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
// This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
// certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
// their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
return;
}
// Don't dispose on first evaluation, because the "disposeWhen" callback might
// e.g., dispose when the associated DOM element isn't in the doc, and it's not
// going to be in the doc until *after* the first evaluation
if (_hasBeenEvaluated && disposeWhen()) {
dispose();
return;
}
_isBeingEvaluated = true;
try {
// Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
// Then, during evaluation, we cross off any that are in fact still being used.
var disposalCandidates = ko.utils.arrayMap(_subscriptionsToDependencies, function(item) {return item.target;});
ko.dependencyDetection.begin(function(subscribable) {
var inOld;
if ((inOld = ko.utils.arrayIndexOf(disposalCandidates, subscribable)) >= 0)
disposalCandidates[inOld] = undefined; // Don't want to dispose this subscription, as it's still being used
else
addSubscriptionToDependency(subscribable); // Brand new subscription - add it
});
var newValue = readFunction.call(evaluatorFunctionTarget);
// For each subscription no longer being used, remove it from the active subscriptions list and dispose it
for (var i = disposalCandidates.length - 1; i >= 0; i--) {
if (disposalCandidates[i])
_subscriptionsToDependencies.splice(i, 1)[0].dispose();
}
_hasBeenEvaluated = true;
dependentObservable["notifySubscribers"](_latestValue, "beforeChange");
_latestValue = newValue;
if (DEBUG) dependentObservable._latestValue = _latestValue;
} finally {
ko.dependencyDetection.end();
}
dependentObservable["notifySubscribers"](_latestValue);
_isBeingEvaluated = false;
if (!_subscriptionsToDependencies.length)
dispose();
}
function dependentObservable() {
if (arguments.length > 0) {
if (typeof writeFunction === "function") {
// Writing a value
writeFunction.apply(evaluatorFunctionTarget, arguments);
} else {
throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
}
return this; // Permits chained assignments
} else {
// Reading the value
if (!_hasBeenEvaluated)
evaluateImmediate();
ko.dependencyDetection.registerDependency(dependentObservable);
return _latestValue;
}
}
function peek() {
if (!_hasBeenEvaluated)
evaluateImmediate();
return _latestValue;
}
function isActive() {
return !_hasBeenEvaluated || _subscriptionsToDependencies.length > 0;
}
// By here, "options" is always non-null
var writeFunction = options["write"],
disposeWhenNodeIsRemoved = options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
disposeWhen = options["disposeWhen"] || options.disposeWhen || function() { return false; },
dispose = disposeAllSubscriptionsToDependencies,
_subscriptionsToDependencies = [],
evaluationTimeoutInstance = null;
if (!evaluatorFunctionTarget)
evaluatorFunctionTarget = options["owner"];
dependentObservable.peek = peek;
dependentObservable.getDependenciesCount = function () { return _subscriptionsToDependencies.length; };
dependentObservable.hasWriteFunction = typeof options["write"] === "function";
dependentObservable.dispose = function () { dispose(); };
dependentObservable.isActive = isActive;
ko.subscribable.call(dependentObservable);
ko.utils.extend(dependentObservable, ko.dependentObservable['fn']);
ko.exportProperty(dependentObservable, 'peek', dependentObservable.peek);
ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);
ko.exportProperty(dependentObservable, 'isActive', dependentObservable.isActive);
ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);
// Evaluate, unless deferEvaluation is true
if (options['deferEvaluation'] !== true)
evaluateImmediate();
// Build "disposeWhenNodeIsRemoved" and "disposeWhenNodeIsRemovedCallback" option values.
// But skip if isActive is false (there will never be any dependencies to dispose).
// (Note: "disposeWhenNodeIsRemoved" option both proactively disposes as soon as the node is removed using ko.removeNode(),
// plus adds a "disposeWhen" callback that, on each evaluation, disposes if the node was removed by some other means.)
if (disposeWhenNodeIsRemoved && isActive()) {
dispose = function() {
ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, arguments.callee);
disposeAllSubscriptionsToDependencies();
};
ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, dispose);
var existingDisposeWhenFunction = disposeWhen;
disposeWhen = function () {
return !ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved) || existingDisposeWhenFunction();
}
}
return dependentObservable;
};
ko.isComputed = function(instance) {
return ko.hasPrototype(instance, ko.dependentObservable);
};
var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
ko.dependentObservable[protoProp] = ko.observable;
ko.dependentObservable['fn'] = {};
ko.dependentObservable['fn'][protoProp] = ko.dependentObservable;
ko.exportSymbol('dependentObservable', ko.dependentObservable);
ko.exportSymbol('computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"
ko.exportSymbol('isComputed', ko.isComputed);
(function() {
var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)
ko.toJS = function(rootObject) {
if (arguments.length == 0)
throw new Error("When calling ko.toJS, pass the object you want to convert.");
// We just unwrap everything at every level in the object graph
return mapJsObjectGraph(rootObject, function(valueToMap) {
// Loop because an observable's value might in turn be another observable wrapper
for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
valueToMap = valueToMap();
return valueToMap;
});
};
ko.toJSON = function(rootObject, replacer, space) { // replacer and space are optional
var plainJavaScriptObject = ko.toJS(rootObject);
return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
};
function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
visitedObjects = visitedObjects || new objectLookup();
rootObject = mapInputCallback(rootObject);
var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof Date));
if (!canHaveProperties)
return rootObject;
var outputProperties = rootObject instanceof Array ? [] : {};
visitedObjects.save(rootObject, outputProperties);
visitPropertiesOrArrayEntries(rootObject, function(indexer) {
var propertyValue = mapInputCallback(rootObject[indexer]);
switch (typeof propertyValue) {
case "boolean":
case "number":
case "string":
case "function":
outputProperties[indexer] = propertyValue;
break;
case "object":
case "undefined":
var previouslyMappedValue = visitedObjects.get(propertyValue);
outputProperties[indexer] = (previouslyMappedValue !== undefined)
? previouslyMappedValue
: mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
break;
}
});
return outputProperties;
}
function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
if (rootObject instanceof Array) {
for (var i = 0; i < rootObject.length; i++)
visitorCallback(i);
// For arrays, also respect toJSON property for custom mappings (fixes #278)
if (typeof rootObject['toJSON'] == 'function')
visitorCallback('toJSON');
} else {
for (var propertyName in rootObject)
visitorCallback(propertyName);
}
};
function objectLookup() {
var keys = [];
var values = [];
this.save = function(key, value) {
var existingIndex = ko.utils.arrayIndexOf(keys, key);
if (existingIndex >= 0)
values[existingIndex] = value;
else {
keys.push(key);
values.push(value);
}
};
this.get = function(key) {
var existingIndex = ko.utils.arrayIndexOf(keys, key);
return (existingIndex >= 0) ? values[existingIndex] : undefined;
};
};
})();
ko.exportSymbol('toJS', ko.toJS);
ko.exportSymbol('toJSON', ko.toJSON);
(function () {
var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
// Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
// are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
// that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
ko.selectExtensions = {
readValue : function(element) {
switch (ko.utils.tagNameLower(element)) {
case 'option':
if (element[hasDomDataExpandoProperty] === true)
return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
return ko.utils.ieVersion <= 7
? (element.getAttributeNode('value').specified ? element.value : element.text)
: element.value;
case 'select':
return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
default:
return element.value;
}
},
writeValue: function(element, value) {
switch (ko.utils.tagNameLower(element)) {
case 'option':
switch(typeof value) {
case "string":
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
delete element[hasDomDataExpandoProperty];
}
element.value = value;
break;
default:
// Store arbitrary object using DomData
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
element[hasDomDataExpandoProperty] = true;
// Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
element.value = typeof value === "number" ? value : "";
break;
}
break;
case 'select':
for (var i = element.options.length - 1; i >= 0; i--) {
if (ko.selectExtensions.readValue(element.options[i]) == value) {
element.selectedIndex = i;
break;
}
}
break;
default:
if ((value === null) || (value === undefined))
value = "";
element.value = value;
break;
}
}
};
})();
ko.exportSymbol('selectExtensions', ko.selectExtensions);
ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);
ko.expressionRewriting = (function () {
var restoreCapturedTokensRegex = /\@ko_token_(\d+)\@/g;
var javaScriptReservedWords = ["true", "false"];
// Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor
// This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).
var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;
function restoreTokens(string, tokens) {
var prevValue = null;
while (string != prevValue) { // Keep restoring tokens until it no longer makes a difference (they may be nested)
prevValue = string;
string = string.replace(restoreCapturedTokensRegex, function (match, tokenIndex) {
return tokens[tokenIndex];
});
}
return string;
}
function getWriteableValue(expression) {
if (ko.utils.arrayIndexOf(javaScriptReservedWords, ko.utils.stringTrim(expression).toLowerCase()) >= 0)
return false;
var match = expression.match(javaScriptAssignmentTarget);
return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
}
function ensureQuoted(key) {
var trimmedKey = ko.utils.stringTrim(key);
switch (trimmedKey.length && trimmedKey.charAt(0)) {
case "'":
case '"':
return key;
default:
return "'" + trimmedKey + "'";
}
}
return {
bindingRewriteValidators: [],
parseObjectLiteral: function(objectLiteralString) {
// A full tokeniser+lexer would add too much weight to this library, so here's a simple parser
// that is sufficient just to split an object literal string into a set of top-level key-value pairs
var str = ko.utils.stringTrim(objectLiteralString);
if (str.length < 3)
return [];
if (str.charAt(0) === "{")// Ignore any braces surrounding the whole object literal
str = str.substring(1, str.length - 1);
// Pull out any string literals and regex literals
var tokens = [];
var tokenStart = null, tokenEndChar;
for (var position = 0; position < str.length; position++) {
var c = str.charAt(position);
if (tokenStart === null) {
switch (c) {
case '"':
case "'":
case "/":
tokenStart = position;
tokenEndChar = c;
break;
}
} else if ((c == tokenEndChar) && (str.charAt(position - 1) !== "\\")) {
var token = str.substring(tokenStart, position + 1);
tokens.push(token);
var replacement = "@ko_token_" + (tokens.length - 1) + "@";
str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
position -= (token.length - replacement.length);
tokenStart = null;
}
}
// Next pull out balanced paren, brace, and bracket blocks
tokenStart = null;
tokenEndChar = null;
var tokenDepth = 0, tokenStartChar = null;
for (var position = 0; position < str.length; position++) {
var c = str.charAt(position);
if (tokenStart === null) {
switch (c) {
case "{": tokenStart = position; tokenStartChar = c;
tokenEndChar = "}";
break;
case "(": tokenStart = position; tokenStartChar = c;
tokenEndChar = ")";
break;
case "[": tokenStart = position; tokenStartChar = c;
tokenEndChar = "]";
break;
}
}
if (c === tokenStartChar)
tokenDepth++;
else if (c === tokenEndChar) {
tokenDepth--;
if (tokenDepth === 0) {
var token = str.substring(tokenStart, position + 1);
tokens.push(token);
var replacement = "@ko_token_" + (tokens.length - 1) + "@";
str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
position -= (token.length - replacement.length);
tokenStart = null;
}
}
}
// Now we can safely split on commas to get the key/value pairs
var result = [];
var keyValuePairs = str.split(",");
for (var i = 0, j = keyValuePairs.length; i < j; i++) {
var pair = keyValuePairs[i];
var colonPos = pair.indexOf(":");
if ((colonPos > 0) && (colonPos < pair.length - 1)) {
var key = pair.substring(0, colonPos);
var value = pair.substring(colonPos + 1);
result.push({ 'key': restoreTokens(key, tokens), 'value': restoreTokens(value, tokens) });
} else {
result.push({ 'unknown': restoreTokens(pair, tokens) });
}
}
return result;
},
preProcessBindings: function (objectLiteralStringOrKeyValueArray) {
var keyValueArray = typeof objectLiteralStringOrKeyValueArray === "string"
? ko.expressionRewriting.parseObjectLiteral(objectLiteralStringOrKeyValueArray)
: objectLiteralStringOrKeyValueArray;
var resultStrings = [], propertyAccessorResultStrings = [];
var keyValueEntry;
for (var i = 0; keyValueEntry = keyValueArray[i]; i++) {
if (resultStrings.length > 0)
resultStrings.push(",");
if (keyValueEntry['key']) {
var quotedKey = ensureQuoted(keyValueEntry['key']), val = keyValueEntry['value'];
resultStrings.push(quotedKey);
resultStrings.push(":");
resultStrings.push(val);
if (val = getWriteableValue(ko.utils.stringTrim(val))) {
if (propertyAccessorResultStrings.length > 0)
propertyAccessorResultStrings.push(", ");
propertyAccessorResultStrings.push(quotedKey + " : function(__ko_value) { " + val + " = __ko_value; }");
}
} else if (keyValueEntry['unknown']) {
resultStrings.push(keyValueEntry['unknown']);
}
}
var combinedResult = resultStrings.join("");
if (propertyAccessorResultStrings.length > 0) {
var allPropertyAccessors = propertyAccessorResultStrings.join("");
combinedResult = combinedResult + ", '_ko_property_writers' : { " + allPropertyAccessors + " } ";
}
return combinedResult;
},
keyValueArrayContainsKey: function(keyValueArray, key) {
for (var i = 0; i < keyValueArray.length; i++)
if (ko.utils.stringTrim(keyValueArray[i]['key']) == key)
return true;
return false;
},
// Internal, private KO utility for updating model properties from within bindings
// property: If the property being updated is (or might be) an observable, pass it here
// If it turns out to be a writable observable, it will be written to directly
// allBindingsAccessor: All bindings in the current execution context.
// This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
// key: The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
// value: The value to be written
// checkIfDifferent: If true, and if the property being written is a writable observable, the value will only be written if
// it is !== existing value on that writable observable
writeValueToProperty: function(property, allBindingsAccessor, key, value, checkIfDifferent) {
if (!property || !ko.isObservable(property)) {
var propWriters = allBindingsAccessor()['_ko_property_writers'];
if (propWriters && propWriters[key])
propWriters[key](value);
} else if (ko.isWriteableObservable(property) && (!checkIfDifferent || property.peek() !== value)) {
property(value);
}
}
};
})();
ko.exportSymbol('expressionRewriting', ko.expressionRewriting);
ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);
ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);
ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);
// For backward compatibility, define the following aliases. (Previously, these function names were misleading because
// they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)
ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);
ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);(function() {
// "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
// may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
// If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
// of that virtual hierarchy
//
// The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
// without having to scatter special cases all over the binding and templating code.
// IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
// but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
// So, use node.text where available, and node.nodeValue elsewhere
var commentNodesHaveTextProperty = document.createComment("test").text === "<!--test-->";
var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+(.+\s*\:[\s\S]*))?\s*-->$/ : /^\s*ko(?:\s+(.+\s*\:[\s\S]*))?\s*$/;
var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };
function isStartComment(node) {
return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
}
function isEndComment(node) {
return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(endCommentRegex);
}
function getVirtualChildren(startComment, allowUnbalanced) {
var currentNode = startComment;
var depth = 1;
var children = [];
while (currentNode = currentNode.nextSibling) {
if (isEndComment(currentNode)) {
depth--;
if (depth === 0)
return children;
}
children.push(currentNode);
if (isStartComment(currentNode))
depth++;
}
if (!allowUnbalanced)
throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
return null;
}
function getMatchingEndComment(startComment, allowUnbalanced) {
var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
if (allVirtualChildren) {
if (allVirtualChildren.length > 0)
return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
return startComment.nextSibling;
} else
return null; // Must have no matching end comment, and allowUnbalanced is true
}
function getUnbalancedChildTags(node) {
// e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
// from <div>OK</div><!-- /ko --><!-- /ko -->, returns: <!-- /ko --><!-- /ko -->
var childNode = node.firstChild, captureRemaining = null;
if (childNode) {
do {
if (captureRemaining) // We already hit an unbalanced node and are now just scooping up all subsequent nodes
captureRemaining.push(childNode);
else if (isStartComment(childNode)) {
var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
if (matchingEndComment) // It's a balanced tag, so skip immediately to the end of this virtual set
childNode = matchingEndComment;
else
captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
} else if (isEndComment(childNode)) {
captureRemaining = [childNode]; // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
}
} while (childNode = childNode.nextSibling);
}
return captureRemaining;
}
ko.virtualElements = {
allowedBindings: {},
childNodes: function(node) {
return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
},
emptyNode: function(node) {
if (!isStartComment(node))
ko.utils.emptyDomNode(node);
else {
var virtualChildren = ko.virtualElements.childNodes(node);
for (var i = 0, j = virtualChildren.length; i < j; i++)
ko.removeNode(virtualChildren[i]);
}
},
setDomNodeChildren: function(node, childNodes) {
if (!isStartComment(node))
ko.utils.setDomNodeChildren(node, childNodes);
else {
ko.virtualElements.emptyNode(node);
var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
for (var i = 0, j = childNodes.length; i < j; i++)
endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
}
},
prepend: function(containerNode, nodeToPrepend) {
if (!isStartComment(containerNode)) {
if (containerNode.firstChild)
containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);
else
containerNode.appendChild(nodeToPrepend);
} else {
// Start comments must always have a parent and at least one following sibling (the end comment)
containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);
}
},
insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {
if (!insertAfterNode) {
ko.virtualElements.prepend(containerNode, nodeToInsert);
} else if (!isStartComment(containerNode)) {
// Insert after insertion point
if (insertAfterNode.nextSibling)
containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
else
containerNode.appendChild(nodeToInsert);
} else {
// Children of start comments must always have a parent and at least one following sibling (the end comment)
containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
}
},
firstChild: function(node) {
if (!isStartComment(node))
return node.firstChild;
if (!node.nextSibling || isEndComment(node.nextSibling))
return null;
return node.nextSibling;
},
nextSibling: function(node) {
if (isStartComment(node))
node = getMatchingEndComment(node);
if (node.nextSibling && isEndComment(node.nextSibling))
return null;
return node.nextSibling;
},
virtualNodeBindingValue: function(node) {
var regexMatch = isStartComment(node);
return regexMatch ? regexMatch[1] : null;
},
normaliseVirtualElementDomStructure: function(elementVerified) {
// Workaround for https://github.com/SteveSanderson/knockout/issues/155
// (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
// that are direct descendants of <ul> into the preceding <li>)
if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
return;
// Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
// must be intended to appear *after* that child, so move them there.
var childNode = elementVerified.firstChild;
if (childNode) {
do {
if (childNode.nodeType === 1) {
var unbalancedTags = getUnbalancedChildTags(childNode);
if (unbalancedTags) {
// Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
var nodeToInsertBefore = childNode.nextSibling;
for (var i = 0; i < unbalancedTags.length; i++) {
if (nodeToInsertBefore)
elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
else
elementVerified.appendChild(unbalancedTags[i]);
}
}
}
} while (childNode = childNode.nextSibling);
}
}
};
})();
ko.exportSymbol('virtualElements', ko.virtualElements);
ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
//ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild); // firstChild is not minified
ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
//ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling); // nextSibling is not minified
ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
(function() {
var defaultBindingAttributeName = "data-bind";
ko.bindingProvider = function() {
this.bindingCache = {};
};
ko.utils.extend(ko.bindingProvider.prototype, {
'nodeHasBindings': function(node) {
switch (node.nodeType) {
case 1: return node.getAttribute(defaultBindingAttributeName) != null; // Element
case 8: return ko.virtualElements.virtualNodeBindingValue(node) != null; // Comment node
default: return false;
}
},
'getBindings': function(node, bindingContext) {
var bindingsString = this['getBindingsString'](node, bindingContext);
return bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
},
// The following function is only used internally by this default provider.
// It's not part of the interface definition for a general binding provider.
'getBindingsString': function(node, bindingContext) {
switch (node.nodeType) {
case 1: return node.getAttribute(defaultBindingAttributeName); // Element
case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
default: return null;
}
},
// The following function is only used internally by this default provider.
// It's not part of the interface definition for a general binding provider.
'parseBindingsString': function(bindingsString, bindingContext, node) {
try {
var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache);
return bindingFunction(bindingContext, node);
} catch (ex) {
throw new Error("Unable to parse bindings.\nMessage: " + ex + ";\nBindings value: " + bindingsString);
}
}
});
ko.bindingProvider['instance'] = new ko.bindingProvider();
function createBindingsStringEvaluatorViaCache(bindingsString, cache) {
var cacheKey = bindingsString;
return cache[cacheKey]
|| (cache[cacheKey] = createBindingsStringEvaluator(bindingsString));
}
function createBindingsStringEvaluator(bindingsString) {
// Build the source for a function that evaluates "expression"
// For each scope variable, add an extra level of "with" nesting
// Example result: with(sc1) { with(sc0) { return (expression) } }
var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString),
functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
return new Function("$context", "$element", functionBody);
}
})();
ko.exportSymbol('bindingProvider', ko.bindingProvider);
(function () {
ko.bindingHandlers = {};
ko.bindingContext = function(dataItem, parentBindingContext, dataItemAlias) {
if (parentBindingContext) {
ko.utils.extend(this, parentBindingContext); // Inherit $root and any custom properties
this['$parentContext'] = parentBindingContext;
this['$parent'] = parentBindingContext['$data'];
this['$parents'] = (parentBindingContext['$parents'] || []).slice(0);
this['$parents'].unshift(this['$parent']);
} else {
this['$parents'] = [];
this['$root'] = dataItem;
// Export 'ko' in the binding context so it will be available in bindings and templates
// even if 'ko' isn't exported as a global, such as when using an AMD loader.
// See https://github.com/SteveSanderson/knockout/issues/490
this['ko'] = ko;
}
this['$data'] = dataItem;
if (dataItemAlias)
this[dataItemAlias] = dataItem;
}
ko.bindingContext.prototype['createChildContext'] = function (dataItem, dataItemAlias) {
return new ko.bindingContext(dataItem, this, dataItemAlias);
};
ko.bindingContext.prototype['extend'] = function(properties) {
var clone = ko.utils.extend(new ko.bindingContext(), this);
return ko.utils.extend(clone, properties);
};
function validateThatBindingIsAllowedForVirtualElements(bindingName) {
var validator = ko.virtualElements.allowedBindings[bindingName];
if (!validator)
throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
}
function applyBindingsToDescendantsInternal (viewModel, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {
var currentChild, nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
while (currentChild = nextInQueue) {
// Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
nextInQueue = ko.virtualElements.nextSibling(currentChild);
applyBindingsToNodeAndDescendantsInternal(viewModel, currentChild, bindingContextsMayDifferFromDomParentElement);
}
}
function applyBindingsToNodeAndDescendantsInternal (viewModel, nodeVerified, bindingContextMayDifferFromDomParentElement) {
var shouldBindDescendants = true;
// Perf optimisation: Apply bindings only if...
// (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)
// Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those
// (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
var isElement = (nodeVerified.nodeType === 1);
if (isElement) // Workaround IE <= 8 HTML parsing weirdness
ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);
var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement) // Case (1)
|| ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified); // Case (2)
if (shouldApplyBindings)
shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, viewModel, bindingContextMayDifferFromDomParentElement).shouldBindDescendants;
if (shouldBindDescendants) {
// We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,
// * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,
// hence bindingContextsMayDifferFromDomParentElement is false
// * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may
// skip over any number of intermediate virtual elements, any of which might define a custom binding context,
// hence bindingContextsMayDifferFromDomParentElement is true
applyBindingsToDescendantsInternal(viewModel, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);
}
}
var boundElementDomDataKey = '__ko_boundElement';
function applyBindingsToNodeInternal (node, bindings, viewModelOrBindingContext, bindingContextMayDifferFromDomParentElement) {
// Need to be sure that inits are only run once, and updates never run until all the inits have been run
var initPhase = 0; // 0 = before all inits, 1 = during inits, 2 = after all inits
// Each time the dependentObservable is evaluated (after data changes),
// the binding attribute is reparsed so that it can pick out the correct
// model properties in the context of the changed data.
// DOM event callbacks need to be able to access this changed data,
// so we need a single parsedBindings variable (shared by all callbacks
// associated with this node's bindings) that all the closures can access.
var parsedBindings;
function makeValueAccessor(bindingKey) {
return function () { return parsedBindings[bindingKey] }
}
function parsedBindingsAccessor() {
return parsedBindings;
}
var bindingHandlerThatControlsDescendantBindings;
// Prevent multiple applyBindings calls for the same node, except when a binding value is specified
var alreadyBound = ko.utils.domData.get(node, boundElementDomDataKey);
if (!bindings) {
if (alreadyBound) {
throw Error("You cannot apply bindings multiple times to the same element.");
}
ko.utils.domData.set(node, boundElementDomDataKey, true);
}
ko.dependentObservable(
function () {
// Ensure we have a nonnull binding context to work with
var bindingContextInstance = viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
? viewModelOrBindingContext
: new ko.bindingContext(ko.utils.unwrapObservable(viewModelOrBindingContext));
var viewModel = bindingContextInstance['$data'];
// Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because
// we can easily recover it just by scanning up the node's ancestors in the DOM
// (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent)
if (!alreadyBound && bindingContextMayDifferFromDomParentElement)
ko.storedBindingContextForNode(node, bindingContextInstance);
// Use evaluatedBindings if given, otherwise fall back on asking the bindings provider to give us some bindings
var evaluatedBindings = (typeof bindings == "function") ? bindings(bindingContextInstance, node) : bindings;
parsedBindings = evaluatedBindings || ko.bindingProvider['instance']['getBindings'](node, bindingContextInstance);
if (parsedBindings) {
// First run all the inits, so bindings can register for notification on changes
if (initPhase === 0) {
initPhase = 1;
for (var bindingKey in parsedBindings) {
var binding = ko.bindingHandlers[bindingKey];
if (binding && node.nodeType === 8)
validateThatBindingIsAllowedForVirtualElements(bindingKey);
if (binding && typeof binding["init"] == "function") {
var handlerInitFn = binding["init"];
var initResult = handlerInitFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
// If this binding handler claims to control descendant bindings, make a note of this
if (initResult && initResult['controlsDescendantBindings']) {
if (bindingHandlerThatControlsDescendantBindings !== undefined)
throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
bindingHandlerThatControlsDescendantBindings = bindingKey;
}
}
}
initPhase = 2;
}
// ... then run all the updates, which might trigger changes even on the first evaluation
if (initPhase === 2) {
for (var bindingKey in parsedBindings) {
var binding = ko.bindingHandlers[bindingKey];
if (binding && typeof binding["update"] == "function") {
var handlerUpdateFn = binding["update"];
handlerUpdateFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
}
}
}
}
},
null,
{ disposeWhenNodeIsRemoved : node }
);
return {
shouldBindDescendants: bindingHandlerThatControlsDescendantBindings === undefined
};
};
var storedBindingContextDomDataKey = "__ko_bindingContext__";
ko.storedBindingContextForNode = function (node, bindingContext) {
if (arguments.length == 2)
ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
else
return ko.utils.domData.get(node, storedBindingContextDomDataKey);
}
ko.applyBindingsToNode = function (node, bindings, viewModel) {
if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
ko.virtualElements.normaliseVirtualElementDomStructure(node);
return applyBindingsToNodeInternal(node, bindings, viewModel, true);
};
ko.applyBindingsToDescendants = function(viewModel, rootNode) {
if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
applyBindingsToDescendantsInternal(viewModel, rootNode, true);
};
ko.applyBindings = function (viewModel, rootNode) {
if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))
throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional
applyBindingsToNodeAndDescendantsInternal(viewModel, rootNode, true);
};
// Retrieving binding context from arbitrary nodes
ko.contextFor = function(node) {
// We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
switch (node.nodeType) {
case 1:
case 8:
var context = ko.storedBindingContextForNode(node);
if (context) return context;
if (node.parentNode) return ko.contextFor(node.parentNode);
break;
}
return undefined;
};
ko.dataFor = function(node) {
var context = ko.contextFor(node);
return context ? context['$data'] : undefined;
};
ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
ko.exportSymbol('applyBindings', ko.applyBindings);
ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
ko.exportSymbol('contextFor', ko.contextFor);
ko.exportSymbol('dataFor', ko.dataFor);
})();
var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };
ko.bindingHandlers['attr'] = {
'update': function(element, valueAccessor, allBindingsAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor()) || {};
for (var attrName in value) {
if (typeof attrName == "string") {
var attrValue = ko.utils.unwrapObservable(value[attrName]);
// To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
// when someProp is a "no value"-like value (strictly null, false, or undefined)
// (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
if (toRemove)
element.removeAttribute(attrName);
// In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the
// HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
// but instead of figuring out the mode, we'll just set the attribute through the Javascript
// property for IE <= 8.
if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {
attrName = attrHtmlToJavascriptMap[attrName];
if (toRemove)
element.removeAttribute(attrName);
else
element[attrName] = attrValue;
} else if (!toRemove) {
element.setAttribute(attrName, attrValue.toString());
}
// Treat "name" specially - although you can think of it as an attribute, it also needs
// special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)
// Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing
// entirely, and there's no strong reason to allow for such casing in HTML.
if (attrName === "name") {
ko.utils.setElementName(element, toRemove ? "" : attrValue.toString());
}
}
}
}
};
ko.bindingHandlers['checked'] = {
'init': function (element, valueAccessor, allBindingsAccessor) {
var updateHandler = function() {
var valueToWrite;
if (element.type == "checkbox") {
valueToWrite = element.checked;
} else if ((element.type == "radio") && (element.checked)) {
valueToWrite = element.value;
} else {
return; // "checked" binding only responds to checkboxes and selected radio buttons
}
var modelValue = valueAccessor(), unwrappedValue = ko.utils.unwrapObservable(modelValue);
if ((element.type == "checkbox") && (unwrappedValue instanceof Array)) {
// For checkboxes bound to an array, we add/remove the checkbox value to that array
// This works for both observable and non-observable arrays
var existingEntryIndex = ko.utils.arrayIndexOf(unwrappedValue, element.value);
if (element.checked && (existingEntryIndex < 0))
modelValue.push(element.value);
else if ((!element.checked) && (existingEntryIndex >= 0))
modelValue.splice(existingEntryIndex, 1);
} else {
ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'checked', valueToWrite, true);
}
};
ko.utils.registerEventHandler(element, "click", updateHandler);
// IE 6 won't allow radio buttons to be selected unless they have a name
if ((element.type == "radio") && !element.name)
ko.bindingHandlers['uniqueName']['init'](element, function() { return true });
},
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
if (element.type == "checkbox") {
if (value instanceof Array) {
// When bound to an array, the checkbox being checked represents its value being present in that array
element.checked = ko.utils.arrayIndexOf(value, element.value) >= 0;
} else {
// When bound to anything other value (not an array), the checkbox being checked represents the value being trueish
element.checked = value;
}
} else if (element.type == "radio") {
element.checked = (element.value == value);
}
}
};
var classesWrittenByBindingKey = '__ko__cssValue';
ko.bindingHandlers['css'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
if (typeof value == "object") {
for (var className in value) {
var shouldHaveClass = ko.utils.unwrapObservable(value[className]);
ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
}
} else {
value = String(value || ''); // Make sure we don't try to store or set a non-string value
ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);
element[classesWrittenByBindingKey] = value;
ko.utils.toggleDomNodeCssClass(element, value, true);
}
}
};
ko.bindingHandlers['enable'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
if (value && element.disabled)
element.removeAttribute("disabled");
else if ((!value) && (!element.disabled))
element.disabled = true;
}
};
ko.bindingHandlers['disable'] = {
'update': function (element, valueAccessor) {
ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });
}
};
// For certain common events (currently just 'click'), allow a simplified data-binding syntax
// e.g. click:handler instead of the usual full-length event:{click:handler}
function makeEventHandlerShortcut(eventName) {
ko.bindingHandlers[eventName] = {
'init': function(element, valueAccessor, allBindingsAccessor, viewModel) {
var newValueAccessor = function () {
var result = {};
result[eventName] = valueAccessor();
return result;
};
return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindingsAccessor, viewModel);
}
}
}
ko.bindingHandlers['event'] = {
'init' : function (element, valueAccessor, allBindingsAccessor, viewModel) {
var eventsToHandle = valueAccessor() || {};
for(var eventNameOutsideClosure in eventsToHandle) {
(function() {
var eventName = eventNameOutsideClosure; // Separate variable to be captured by event handler closure
if (typeof eventName == "string") {
ko.utils.registerEventHandler(element, eventName, function (event) {
var handlerReturnValue;
var handlerFunction = valueAccessor()[eventName];
if (!handlerFunction)
return;
var allBindings = allBindingsAccessor();
try {
// Take all the event args, and prefix with the viewmodel
var argsForHandler = ko.utils.makeArray(arguments);
argsForHandler.unshift(viewModel);
handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
} finally {
if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
}
}
var bubble = allBindings[eventName + 'Bubble'] !== false;
if (!bubble) {
event.cancelBubble = true;
if (event.stopPropagation)
event.stopPropagation();
}
});
}
})();
}
}
};
// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
ko.bindingHandlers['foreach'] = {
makeTemplateValueAccessor: function(valueAccessor) {
return function() {
var modelValue = valueAccessor(),
unwrappedValue = ko.utils.peekObservable(modelValue); // Unwrap without setting a dependency here
// If unwrappedValue is the array, pass in the wrapped value on its own
// The value will be unwrapped and tracked within the template binding
// (See https://github.com/SteveSanderson/knockout/issues/523)
if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };
// If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
ko.utils.unwrapObservable(modelValue);
return {
'foreach': unwrappedValue['data'],
'as': unwrappedValue['as'],
'includeDestroyed': unwrappedValue['includeDestroyed'],
'afterAdd': unwrappedValue['afterAdd'],
'beforeRemove': unwrappedValue['beforeRemove'],
'afterRender': unwrappedValue['afterRender'],
'beforeMove': unwrappedValue['beforeMove'],
'afterMove': unwrappedValue['afterMove'],
'templateEngine': ko.nativeTemplateEngine.instance
};
};
},
'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
},
'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
}
};
ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
ko.virtualElements.allowedBindings['foreach'] = true;
var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';
var hasfocusLastValue = '__ko_hasfocusLastValue';
ko.bindingHandlers['hasfocus'] = {
'init': function(element, valueAccessor, allBindingsAccessor) {
var handleElementFocusChange = function(isFocused) {
// Where possible, ignore which event was raised and determine focus state using activeElement,
// as this avoids phantom focus/blur events raised when changing tabs in modern browsers.
// However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,
// prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus
// from calling 'blur()' on the element when it loses focus.
// Discussion at https://github.com/SteveSanderson/knockout/pull/352
element[hasfocusUpdatingProperty] = true;
var ownerDoc = element.ownerDocument;
if ("activeElement" in ownerDoc) {
isFocused = (ownerDoc.activeElement === element);
}
var modelValue = valueAccessor();
ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'hasfocus', isFocused, true);
//cache the latest value, so we can avoid unnecessarily calling focus/blur in the update function
element[hasfocusLastValue] = isFocused;
element[hasfocusUpdatingProperty] = false;
};
var handleElementFocusIn = handleElementFocusChange.bind(null, true);
var handleElementFocusOut = handleElementFocusChange.bind(null, false);
ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);
ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE
ko.utils.registerEventHandler(element, "blur", handleElementFocusOut);
ko.utils.registerEventHandler(element, "focusout", handleElementFocusOut); // For IE
},
'update': function(element, valueAccessor) {
var value = !!ko.utils.unwrapObservable(valueAccessor()); //force boolean to compare with last value
if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) {
value ? element.focus() : element.blur();
ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
}
}
};
ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make "hasFocus" an alias
ko.bindingHandlers['html'] = {
'init': function() {
// Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
return { 'controlsDescendantBindings': true };
},
'update': function (element, valueAccessor) {
// setHtml will unwrap the value if needed
ko.utils.setHtml(element, valueAccessor());
}
};
var withIfDomDataKey = '__ko_withIfBindingData';
// Makes a binding like with or if
function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {
ko.bindingHandlers[bindingKey] = {
'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
ko.utils.domData.set(element, withIfDomDataKey, {});
return { 'controlsDescendantBindings': true };
},
'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var withIfData = ko.utils.domData.get(element, withIfDomDataKey),
dataValue = ko.utils.unwrapObservable(valueAccessor()),
shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue
isFirstRender = !withIfData.savedNodes,
needsRefresh = isFirstRender || isWith || (shouldDisplay !== withIfData.didDisplayOnLastUpdate);
if (needsRefresh) {
if (isFirstRender) {
withIfData.savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
}
if (shouldDisplay) {
if (!isFirstRender) {
ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(withIfData.savedNodes));
}
ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, dataValue) : bindingContext, element);
} else {
ko.virtualElements.emptyNode(element);
}
withIfData.didDisplayOnLastUpdate = shouldDisplay;
}
}
};
ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings
ko.virtualElements.allowedBindings[bindingKey] = true;
}
// Construct the actual binding handlers
makeWithIfBinding('if');
makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);
makeWithIfBinding('with', true /* isWith */, false /* isNot */,
function(bindingContext, dataValue) {
return bindingContext['createChildContext'](dataValue);
}
);
function ensureDropdownSelectionIsConsistentWithModelValue(element, modelValue, preferModelValue) {
if (preferModelValue) {
if (modelValue !== ko.selectExtensions.readValue(element))
ko.selectExtensions.writeValue(element, modelValue);
}
// No matter which direction we're syncing in, we want the end result to be equality between dropdown value and model value.
// If they aren't equal, either we prefer the dropdown value, or the model value couldn't be represented, so either way,
// change the model value to match the dropdown.
if (modelValue !== ko.selectExtensions.readValue(element))
ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
};
ko.bindingHandlers['options'] = {
'init': function(element) {
// Remove all existing <option>s.
while (element.length > 0) {
element.remove(0);
}
},
'update': function (element, valueAccessor, allBindingsAccessor) {
if (ko.utils.tagNameLower(element) !== "select")
throw new Error("options binding applies only to SELECT elements");
var selectWasPreviouslyEmpty = element.length == 0;
var previousScrollTop = element.scrollTop;
var unwrappedArray = ko.utils.unwrapObservable(valueAccessor()) || [];
var allBindings = allBindingsAccessor();
var includeDestroyed = allBindings['optionsIncludeDestroyed'];
var caption = {};
if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
unwrappedArray = [unwrappedArray];
// Filter out any entries marked as destroyed
var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
return includeDestroyed || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
});
// If caption is included, add it to the array
if (allBindings['optionsCaption']) {
filteredArray.unshift(caption);
}
function applyToObject(object, predicate, defaultValue) {
var predicateType = typeof predicate;
if (predicateType == "function") // Given a function; run it against the data value
return predicate(object);
else if (predicateType == "string") // Given a string; treat it as a property name on the data value
return object[predicate];
else // Given no optionsText arg; use the data value itself
return defaultValue;
}
function optionForArrayItem(arrayEntry, index) {
var option = document.createElement("option");
if (arrayEntry === caption) {
ko.utils.setHtml(option, allBindings['optionsCaption']);
ko.selectExtensions.writeValue(option, undefined);
} else {
// Apply a value to the option element
var optionValue = applyToObject(arrayEntry, allBindings['optionsValue'], arrayEntry);
ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));
// Apply some text to the option element
var optionText = applyToObject(arrayEntry, allBindings['optionsText'], optionValue);
ko.utils.setTextContent(option, optionText);
}
return [option];
}
ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, {'dontLimitMoves':true}, null);
if (selectWasPreviouslyEmpty && ('value' in allBindings)) {
// Ensure consistency between model value and selected option.
// If the dropdown is being populated for the first time here (or was otherwise previously empty),
// the dropdown selection state is meaningless, so we preserve the model value.
ensureDropdownSelectionIsConsistentWithModelValue(element, ko.utils.peekObservable(allBindings['value']), /* preferModelValue */ true);
}
// Workaround for IE9 bug
ko.utils.ensureSelectElementIsRenderedCorrectly(element);
if (Math.abs(previousScrollTop - element.scrollTop) > 20)
element.scrollTop = previousScrollTop;
}
};
ko.bindingHandlers['options'].optionValueDomDataKey = '__ko.optionValueDomData__';
ko.bindingHandlers['selectedOptions'] = {
'init': function (element, valueAccessor, allBindingsAccessor) {
ko.utils.registerEventHandler(element, "change", function () {
var value = valueAccessor(), valueToWrite = [];
ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
if (node.selected)
valueToWrite.push(ko.selectExtensions.readValue(node));
});
ko.expressionRewriting.writeValueToProperty(value, allBindingsAccessor, 'selectedOptions', valueToWrite);
});
},
'update': function (element, valueAccessor) {
if (ko.utils.tagNameLower(element) != "select")
throw new Error("values binding applies only to SELECT elements");
var newValue = ko.utils.unwrapObservable(valueAccessor());
if (newValue && typeof newValue.length == "number") {
ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;
ko.utils.setOptionNodeSelectionState(node, isSelected);
});
}
}
};
ko.bindingHandlers['style'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor() || {});
for (var styleName in value) {
if (typeof styleName == "string") {
var styleValue = ko.utils.unwrapObservable(value[styleName]);
element.style[styleName] = styleValue || ""; // Empty string removes the value, whereas null/undefined have no effect
}
}
}
};
ko.bindingHandlers['submit'] = {
'init': function (element, valueAccessor, allBindingsAccessor, viewModel) {
if (typeof valueAccessor() != "function")
throw new Error("The value for a submit binding must be a function");
ko.utils.registerEventHandler(element, "submit", function (event) {
var handlerReturnValue;
var value = valueAccessor();
try { handlerReturnValue = value.call(viewModel, element); }
finally {
if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
}
}
});
}
};
ko.bindingHandlers['text'] = {
'update': function (element, valueAccessor) {
ko.utils.setTextContent(element, valueAccessor());
}
};
ko.virtualElements.allowedBindings['text'] = true;
ko.bindingHandlers['uniqueName'] = {
'init': function (element, valueAccessor) {
if (valueAccessor()) {
var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
ko.utils.setElementName(element, name);
}
}
};
ko.bindingHandlers['uniqueName'].currentIndex = 0;
ko.bindingHandlers['value'] = {
'init': function (element, valueAccessor, allBindingsAccessor) {
// Always catch "change" event; possibly other events too if asked
var eventsToCatch = ["change"];
var requestedEventsToCatch = allBindingsAccessor()["valueUpdate"];
var propertyChangedFired = false;
if (requestedEventsToCatch) {
if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names
requestedEventsToCatch = [requestedEventsToCatch];
ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);
eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);
}
var valueUpdateHandler = function() {
propertyChangedFired = false;
var modelValue = valueAccessor();
var elementValue = ko.selectExtensions.readValue(element);
ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'value', elementValue);
}
// Workaround for https://github.com/SteveSanderson/knockout/issues/122
// IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text"
&& element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });
ko.utils.registerEventHandler(element, "blur", function() {
if (propertyChangedFired) {
valueUpdateHandler();
}
});
}
ko.utils.arrayForEach(eventsToCatch, function(eventName) {
// The syntax "after<eventname>" means "run the handler asynchronously after the event"
// This is useful, for example, to catch "keydown" events after the browser has updated the control
// (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
var handler = valueUpdateHandler;
if (ko.utils.stringStartsWith(eventName, "after")) {
handler = function() { setTimeout(valueUpdateHandler, 0) };
eventName = eventName.substring("after".length);
}
ko.utils.registerEventHandler(element, eventName, handler);
});
},
'update': function (element, valueAccessor) {
var valueIsSelectOption = ko.utils.tagNameLower(element) === "select";
var newValue = ko.utils.unwrapObservable(valueAccessor());
var elementValue = ko.selectExtensions.readValue(element);
var valueHasChanged = (newValue != elementValue);
// JavaScript's 0 == "" behavious is unfortunate here as it prevents writing 0 to an empty text box (loose equality suggests the values are the same).
// We don't want to do a strict equality comparison as that is more confusing for developers in certain cases, so we specifically special case 0 != "" here.
if ((newValue === 0) && (elementValue !== 0) && (elementValue !== "0"))
valueHasChanged = true;
if (valueHasChanged) {
var applyValueAction = function () { ko.selectExtensions.writeValue(element, newValue); };
applyValueAction();
// Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
// right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
// to apply the value as well.
var alsoApplyAsynchronously = valueIsSelectOption;
if (alsoApplyAsynchronously)
setTimeout(applyValueAction, 0);
}
// If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
// because you're not allowed to have a model value that disagrees with a visible UI selection.
if (valueIsSelectOption && (element.length > 0))
ensureDropdownSelectionIsConsistentWithModelValue(element, newValue, /* preferModelValue */ false);
}
};
ko.bindingHandlers['visible'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
var isCurrentlyVisible = !(element.style.display == "none");
if (value && !isCurrentlyVisible)
element.style.display = "";
else if ((!value) && isCurrentlyVisible)
element.style.display = "none";
}
};
// 'click' is just a shorthand for the usual full-length event:{click:handler}
makeEventHandlerShortcut('click');
// If you want to make a custom template engine,
//
// [1] Inherit from this class (like ko.nativeTemplateEngine does)
// [2] Override 'renderTemplateSource', supplying a function with this signature:
//
// function (templateSource, bindingContext, options) {
// // - templateSource.text() is the text of the template you should render
// // - bindingContext.$data is the data you should pass into the template
// // - you might also want to make bindingContext.$parent, bindingContext.$parents,
// // and bindingContext.$root available in the template too
// // - options gives you access to any other properties set on "data-bind: { template: options }"
// //
// // Return value: an array of DOM nodes
// }
//
// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
//
// function (script) {
// // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
// // For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
// }
//
// This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
// If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
// and then you don't need to override 'createJavaScriptEvaluatorBlock'.
ko.templateEngine = function () { };
ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
throw new Error("Override renderTemplateSource");
};
ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
throw new Error("Override createJavaScriptEvaluatorBlock");
};
ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {
// Named template
if (typeof template == "string") {
templateDocument = templateDocument || document;
var elem = templateDocument.getElementById(template);
if (!elem)
throw new Error("Cannot find template with ID " + template);
return new ko.templateSources.domElement(elem);
} else if ((template.nodeType == 1) || (template.nodeType == 8)) {
// Anonymous template
return new ko.templateSources.anonymousTemplate(template);
} else
throw new Error("Unknown template type: " + template);
};
ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {
var templateSource = this['makeTemplateSource'](template, templateDocument);
return this['renderTemplateSource'](templateSource, bindingContext, options);
};
ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {
// Skip rewriting if requested
if (this['allowTemplateRewriting'] === false)
return true;
return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
};
ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {
var templateSource = this['makeTemplateSource'](template, templateDocument);
var rewritten = rewriterCallback(templateSource['text']());
templateSource['text'](rewritten);
templateSource['data']("isRewritten", true);
};
ko.exportSymbol('templateEngine', ko.templateEngine);
ko.templateRewriting = (function () {
var memoizeDataBindingAttributeSyntaxRegex = /(<[a-z]+\d*(\s+(?!data-bind=)[a-z0-9\-]+(=(\"[^\"]*\"|\'[^\']*\'))?)*\s+)data-bind=(["'])([\s\S]*?)\5/gi;
var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;
function validateDataBindValuesForRewriting(keyValueArray) {
var allValidators = ko.expressionRewriting.bindingRewriteValidators;
for (var i = 0; i < keyValueArray.length; i++) {
var key = keyValueArray[i]['key'];
if (allValidators.hasOwnProperty(key)) {
var validator = allValidators[key];
if (typeof validator === "function") {
var possibleErrorMessage = validator(keyValueArray[i]['value']);
if (possibleErrorMessage)
throw new Error(possibleErrorMessage);
} else if (!validator) {
throw new Error("This template engine does not support the '" + key + "' binding within its templates");
}
}
}
}
function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, templateEngine) {
var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);
validateDataBindValuesForRewriting(dataBindKeyValueArray);
var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray);
// For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
// anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
// extra indirection.
var applyBindingsToNextSiblingScript =
"ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()})";
return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
}
return {
ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {
if (!templateEngine['isTemplateRewritten'](template, templateDocument))
templateEngine['rewriteTemplate'](template, function (htmlString) {
return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
}, templateDocument);
},
memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[6], /* tagToRetain: */ arguments[1], templateEngine);
}).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {
return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", templateEngine);
});
},
applyMemoizedBindingsToNextSibling: function (bindings) {
return ko.memoization.memoize(function (domNode, bindingContext) {
if (domNode.nextSibling)
ko.applyBindingsToNode(domNode.nextSibling, bindings, bindingContext);
});
}
}
})();
// Exported only because it has to be referenced by string lookup from within rewritten template
ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);
(function() {
// A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
// logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
//
// Two are provided by default:
// 1. ko.templateSources.domElement - reads/writes the text content of an arbitrary DOM element
// 2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
// without reading/writing the actual element text content, since it will be overwritten
// with the rendered template output.
// You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
// Template sources need to have the following functions:
// text() - returns the template text from your storage location
// text(value) - writes the supplied template text to your storage location
// data(key) - reads values stored using data(key, value) - see below
// data(key, value) - associates "value" with this template and the key "key". Is used to store information like "isRewritten".
//
// Optionally, template sources can also have the following functions:
// nodes() - returns a DOM element containing the nodes of this template, where available
// nodes(value) - writes the given DOM element to your storage location
// If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
// for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
//
// Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
// using and overriding "makeTemplateSource" to return an instance of your custom template source.
ko.templateSources = {};
// ---- ko.templateSources.domElement -----
ko.templateSources.domElement = function(element) {
this.domElement = element;
}
ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {
var tagNameLower = ko.utils.tagNameLower(this.domElement),
elemContentsProperty = tagNameLower === "script" ? "text"
: tagNameLower === "textarea" ? "value"
: "innerHTML";
if (arguments.length == 0) {
return this.domElement[elemContentsProperty];
} else {
var valueToWrite = arguments[0];
if (elemContentsProperty === "innerHTML")
ko.utils.setHtml(this.domElement, valueToWrite);
else
this.domElement[elemContentsProperty] = valueToWrite;
}
};
ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {
if (arguments.length === 1) {
return ko.utils.domData.get(this.domElement, "templateSourceData_" + key);
} else {
ko.utils.domData.set(this.domElement, "templateSourceData_" + key, arguments[1]);
}
};
// ---- ko.templateSources.anonymousTemplate -----
// Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
// For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
// Writing to "text" is still supported, but then the template data will not be available as DOM nodes.
var anonymousTemplatesDomDataKey = "__ko_anon_template__";
ko.templateSources.anonymousTemplate = function(element) {
this.domElement = element;
}
ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
ko.templateSources.anonymousTemplate.prototype.constructor = ko.templateSources.anonymousTemplate;
ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {
if (arguments.length == 0) {
var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
if (templateData.textData === undefined && templateData.containerData)
templateData.textData = templateData.containerData.innerHTML;
return templateData.textData;
} else {
var valueToWrite = arguments[0];
ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {textData: valueToWrite});
}
};
ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {
if (arguments.length == 0) {
var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
return templateData.containerData;
} else {
var valueToWrite = arguments[0];
ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {containerData: valueToWrite});
}
};
ko.exportSymbol('templateSources', ko.templateSources);
ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
})();
(function () {
var _templateEngine;
ko.setTemplateEngine = function (templateEngine) {
if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
throw new Error("templateEngine must inherit from ko.templateEngine");
_templateEngine = templateEngine;
}
function invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, action) {
var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
nextInQueue = ko.virtualElements.nextSibling(node);
if (node.nodeType === 1 || node.nodeType === 8)
action(node);
}
}
function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
// To be used on any nodes that have been rendered by a template and have been inserted into some parent element
// Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
// the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
// (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
// (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)
if (continuousNodeArray.length) {
var firstNode = continuousNodeArray[0], lastNode = continuousNodeArray[continuousNodeArray.length - 1];
// Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
// whereas a regular applyBindings won't introduce new memoized nodes
invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function(node) {
ko.applyBindings(bindingContext, node);
});
invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function(node) {
ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
});
}
}
function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
return nodeOrNodeArray.nodeType ? nodeOrNodeArray
: nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
: null;
}
function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
options = options || {};
var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
var templateDocument = firstTargetNode && firstTargetNode.ownerDocument;
var templateEngineToUse = (options['templateEngine'] || _templateEngine);
ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);
// Loosely check result is an array of DOM nodes
if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
throw new Error("Template engine must return an array of DOM nodes");
var haveAddedNodesToParent = false;
switch (renderMode) {
case "replaceChildren":
ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
haveAddedNodesToParent = true;
break;
case "replaceNode":
ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
haveAddedNodesToParent = true;
break;
case "ignoreTargetNode": break;
default:
throw new Error("Unknown renderMode: " + renderMode);
}
if (haveAddedNodesToParent) {
activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
if (options['afterRender'])
ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]);
}
return renderedNodesArray;
}
ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
options = options || {};
if ((options['templateEngine'] || _templateEngine) == undefined)
throw new Error("Set a template engine before calling renderTemplate");
renderMode = renderMode || "replaceChildren";
if (targetNodeOrNodeArray) {
var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;
return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
function () {
// Ensure we've got a proper binding context to work with
var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
? dataOrBindingContext
: new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));
// Support selecting template as a function of the data being rendered
var templateName = typeof(template) == 'function' ? template(bindingContext['$data'], bindingContext) : template;
var renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
if (renderMode == "replaceNode") {
targetNodeOrNodeArray = renderedNodesArray;
firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
}
},
null,
{ disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
);
} else {
// We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
return ko.memoization.memoize(function (domNode) {
ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
});
}
};
ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
// Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
// activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
var arrayItemContext;
// This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
var executeTemplateForArrayItem = function (arrayValue, index) {
// Support selecting template as a function of the data being rendered
arrayItemContext = parentBindingContext['createChildContext'](ko.utils.unwrapObservable(arrayValue), options['as']);
arrayItemContext['$index'] = index;
var templateName = typeof(template) == 'function' ? template(arrayValue, arrayItemContext) : template;
return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options);
}
// This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {
activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
if (options['afterRender'])
options['afterRender'](addedNodesArray, arrayValue);
};
return ko.dependentObservable(function () {
var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
unwrappedArray = [unwrappedArray];
// Filter out any entries marked as destroyed
var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
});
// Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).
// If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.
ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]);
}, null, { disposeWhenNodeIsRemoved: targetNode });
};
var templateComputedDomDataKey = '__ko__templateComputedDomDataKey__';
function disposeOldComputedAndStoreNewOne(element, newComputed) {
var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
if (oldComputed && (typeof(oldComputed.dispose) == 'function'))
oldComputed.dispose();
ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined);
}
ko.bindingHandlers['template'] = {
'init': function(element, valueAccessor) {
// Support anonymous templates
var bindingValue = ko.utils.unwrapObservable(valueAccessor());
if ((typeof bindingValue != "string") && (!bindingValue['name']) && (element.nodeType == 1 || element.nodeType == 8)) {
// It's an anonymous template - store the element contents, then clear the element
var templateNodes = element.nodeType == 1 ? element.childNodes : ko.virtualElements.childNodes(element),
container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
new ko.templateSources.anonymousTemplate(element)['nodes'](container);
}
return { 'controlsDescendantBindings': true };
},
'update': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var templateName = ko.utils.unwrapObservable(valueAccessor()),
options = {},
shouldDisplay = true,
dataValue,
templateComputed = null;
if (typeof templateName != "string") {
options = templateName;
templateName = options['name'];
// Support "if"/"ifnot" conditions
if ('if' in options)
shouldDisplay = ko.utils.unwrapObservable(options['if']);
if (shouldDisplay && 'ifnot' in options)
shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);
dataValue = ko.utils.unwrapObservable(options['data']);
}
if ('foreach' in options) {
// Render once for each data point (treating data set as empty if shouldDisplay==false)
var dataArray = (shouldDisplay && options['foreach']) || [];
templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext);
} else if (!shouldDisplay) {
ko.virtualElements.emptyNode(element);
} else {
// Render once for this single data point (or use the viewModel if no data was provided)
var innerBindingContext = ('data' in options) ?
bindingContext['createChildContext'](dataValue, options['as']) : // Given an explitit 'data' value, we create a child binding context for it
bindingContext; // Given no explicit 'data' value, we retain the same binding context
templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element);
}
// It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)
disposeOldComputedAndStoreNewOne(element, templateComputed);
}
};
// Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {
var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);
if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)
if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
return null; // Named templates can be rewritten, so return "no error"
return "This template engine does not support anonymous templates nested within its templates";
};
ko.virtualElements.allowedBindings['template'] = true;
})();
ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
ko.exportSymbol('renderTemplate', ko.renderTemplate);
ko.utils.compareArrays = (function () {
var statusNotInOld = 'added', statusNotInNew = 'deleted';
// Simple calculation based on Levenshtein distance.
function compareArrays(oldArray, newArray, dontLimitMoves) {
oldArray = oldArray || [];
newArray = newArray || [];
if (oldArray.length <= newArray.length)
return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, dontLimitMoves);
else
return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, dontLimitMoves);
}
function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, dontLimitMoves) {
var myMin = Math.min,
myMax = Math.max,
editDistanceMatrix = [],
smlIndex, smlIndexMax = smlArray.length,
bigIndex, bigIndexMax = bigArray.length,
compareRange = (bigIndexMax - smlIndexMax) || 1,
maxDistance = smlIndexMax + bigIndexMax + 1,
thisRow, lastRow,
bigIndexMaxForRow, bigIndexMinForRow;
for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {
lastRow = thisRow;
editDistanceMatrix.push(thisRow = []);
bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);
bigIndexMinForRow = myMax(0, smlIndex - 1);
for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {
if (!bigIndex)
thisRow[bigIndex] = smlIndex + 1;
else if (!smlIndex) // Top row - transform empty array into new array via additions
thisRow[bigIndex] = bigIndex + 1;
else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])
thisRow[bigIndex] = lastRow[bigIndex - 1]; // copy value (no edit)
else {
var northDistance = lastRow[bigIndex] || maxDistance; // not in big (deletion)
var westDistance = thisRow[bigIndex - 1] || maxDistance; // not in small (addition)
thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;
}
}
}
var editScript = [], meMinusOne, notInSml = [], notInBig = [];
for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {
meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;
if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) {
notInSml.push(editScript[editScript.length] = { // added
'status': statusNotInSml,
'value': bigArray[--bigIndex],
'index': bigIndex });
} else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {
notInBig.push(editScript[editScript.length] = { // deleted
'status': statusNotInBig,
'value': smlArray[--smlIndex],
'index': smlIndex });
} else {
editScript.push({
'status': "retained",
'value': bigArray[--bigIndex] });
--smlIndex;
}
}
if (notInSml.length && notInBig.length) {
// Set a limit on the number of consecutive non-matching comparisons; having it a multiple of
// smlIndexMax keeps the time complexity of this algorithm linear.
var limitFailedCompares = smlIndexMax * 10, failedCompares,
a, d, notInSmlItem, notInBigItem;
// Go through the items that have been added and deleted and try to find matches between them.
for (failedCompares = a = 0; (dontLimitMoves || failedCompares < limitFailedCompares) && (notInSmlItem = notInSml[a]); a++) {
for (d = 0; notInBigItem = notInBig[d]; d++) {
if (notInSmlItem['value'] === notInBigItem['value']) {
notInSmlItem['moved'] = notInBigItem['index'];
notInBigItem['moved'] = notInSmlItem['index'];
notInBig.splice(d,1); // This item is marked as moved; so remove it from notInBig list
failedCompares = d = 0; // Reset failed compares count because we're checking for consecutive failures
break;
}
}
failedCompares += d;
}
}
return editScript.reverse();
}
return compareArrays;
})();
ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);
(function () {
// Objective:
// * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
// map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
// * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
// so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
// previously mapped - retain those nodes, and just insert/delete other ones
// "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
// You can use this, for example, to activate bindings on those nodes.
function fixUpNodesToBeMovedOrRemoved(contiguousNodeArray) {
// Before moving, deleting, or replacing a set of nodes that were previously outputted by the "map" function, we have to reconcile
// them against what is in the DOM right now. It may be that some of the nodes have already been removed from the document,
// or that new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been
// leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.
// So, this function translates the old "map" output array into its best guess of what set of current DOM nodes should be removed.
//
// Rules:
// [A] Any leading nodes that aren't in the document any more should be ignored
// These most likely correspond to memoization nodes that were already removed during binding
// See https://github.com/SteveSanderson/knockout/pull/440
// [B] We want to output a contiguous series of nodes that are still in the document. So, ignore any nodes that
// have already been removed, and include any nodes that have been inserted among the previous collection
// Rule [A]
while (contiguousNodeArray.length && !ko.utils.domNodeIsAttachedToDocument(contiguousNodeArray[0]))
contiguousNodeArray.splice(0, 1);
// Rule [B]
if (contiguousNodeArray.length > 1) {
// Build up the actual new contiguous node set
var current = contiguousNodeArray[0], last = contiguousNodeArray[contiguousNodeArray.length - 1], newContiguousSet = [current];
while (current !== last) {
current = current.nextSibling;
if (!current) // Won't happen, except if the developer has manually removed some DOM elements (then we're in an undefined scenario)
return;
newContiguousSet.push(current);
}
// ... then mutate the input array to match this.
// (The following line replaces the contents of contiguousNodeArray with newContiguousSet)
Array.prototype.splice.apply(contiguousNodeArray, [0, contiguousNodeArray.length].concat(newContiguousSet));
}
return contiguousNodeArray;
}
function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
// Map this array value inside a dependentObservable so we re-map when any dependency changes
var mappedNodes = [];
var dependentObservable = ko.dependentObservable(function() {
var newMappedNodes = mapping(valueToMap, index) || [];
// On subsequent evaluations, just replace the previously-inserted DOM nodes
if (mappedNodes.length > 0) {
ko.utils.replaceDomNodes(fixUpNodesToBeMovedOrRemoved(mappedNodes), newMappedNodes);
if (callbackAfterAddingNodes)
ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);
}
// Replace the contents of the mappedNodes array, thereby updating the record
// of which nodes would be deleted if valueToMap was itself later removed
mappedNodes.splice(0, mappedNodes.length);
ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
}, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return !ko.utils.anyDomNodeIsAttachedToDocument(mappedNodes); } });
return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) };
}
var lastMappingResultDomDataKey = "setDomNodeChildrenFromArrayMapping_lastMappingResult";
ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {
// Compare the provided array against the previous one
array = array || [];
options = options || {};
var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;
var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];
var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });
var editScript = ko.utils.compareArrays(lastArray, array, options['dontLimitMoves']);
// Build the new mapping result
var newMappingResult = [];
var lastMappingResultIndex = 0;
var newMappingResultIndex = 0;
var nodesToDelete = [];
var itemsToProcess = [];
var itemsForBeforeRemoveCallbacks = [];
var itemsForMoveCallbacks = [];
var itemsForAfterAddCallbacks = [];
var mapData;
function itemMovedOrRetained(editScriptIndex, oldPosition) {
mapData = lastMappingResult[oldPosition];
if (newMappingResultIndex !== oldPosition)
itemsForMoveCallbacks[editScriptIndex] = mapData;
// Since updating the index might change the nodes, do so before calling fixUpNodesToBeMovedOrRemoved
mapData.indexObservable(newMappingResultIndex++);
fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes);
newMappingResult.push(mapData);
itemsToProcess.push(mapData);
}
function callCallback(callback, items) {
if (callback) {
for (var i = 0, n = items.length; i < n; i++) {
if (items[i]) {
ko.utils.arrayForEach(items[i].mappedNodes, function(node) {
callback(node, i, items[i].arrayEntry);
});
}
}
}
}
for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) {
movedIndex = editScriptItem['moved'];
switch (editScriptItem['status']) {
case "deleted":
if (movedIndex === undefined) {
mapData = lastMappingResult[lastMappingResultIndex];
// Stop tracking changes to the mapping for these nodes
if (mapData.dependentObservable)
mapData.dependentObservable.dispose();
// Queue these nodes for later removal
nodesToDelete.push.apply(nodesToDelete, fixUpNodesToBeMovedOrRemoved(mapData.mappedNodes));
if (options['beforeRemove']) {
itemsForBeforeRemoveCallbacks[i] = mapData;
itemsToProcess.push(mapData);
}
}
lastMappingResultIndex++;
break;
case "retained":
itemMovedOrRetained(i, lastMappingResultIndex++);
break;
case "added":
if (movedIndex !== undefined) {
itemMovedOrRetained(i, movedIndex);
} else {
mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) };
newMappingResult.push(mapData);
itemsToProcess.push(mapData);
if (!isFirstExecution)
itemsForAfterAddCallbacks[i] = mapData;
}
break;
}
}
// Call beforeMove first before any changes have been made to the DOM
callCallback(options['beforeMove'], itemsForMoveCallbacks);
// Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)
ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);
// Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)
for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) {
// Get nodes for newly added items
if (!mapData.mappedNodes)
ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));
// Put nodes in the right place if they aren't there already
for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) {
if (node !== nextNode)
ko.virtualElements.insertAfter(domNode, node, lastNode);
}
// Run the callbacks for newly added nodes (for example, to apply bindings, etc.)
if (!mapData.initialized && callbackAfterAddingNodes) {
callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);
mapData.initialized = true;
}
}
// If there's a beforeRemove callback, call it after reordering.
// Note that we assume that the beforeRemove callback will usually be used to remove the nodes using
// some sort of animation, which is why we first reorder the nodes that will be removed. If the
// callback instead removes the nodes right away, it would be more efficient to skip reordering them.
// Perhaps we'll make that change in the future if this scenario becomes more common.
callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);
// Finally call afterMove and afterAdd callbacks
callCallback(options['afterMove'], itemsForMoveCallbacks);
callCallback(options['afterAdd'], itemsForAfterAddCallbacks);
// Store a copy of the array items we just considered so we can difference it next time
ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
}
})();
ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
ko.nativeTemplateEngine = function () {
this['allowTemplateRewriting'] = false;
}
ko.nativeTemplateEngine.prototype = new ko.templateEngine();
ko.nativeTemplateEngine.prototype.constructor = ko.nativeTemplateEngine;
ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
templateNodes = templateNodesFunc ? templateSource['nodes']() : null;
if (templateNodes) {
return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
} else {
var templateText = templateSource['text']();
return ko.utils.parseHtmlFragment(templateText);
}
};
ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
ko.setTemplateEngine(ko.nativeTemplateEngine.instance);
ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
(function() {
ko.jqueryTmplTemplateEngine = function () {
// Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
// doesn't expose a version number, so we have to infer it.
// Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
// which KO internally refers to as version "2", so older versions are no longer detected.
var jQueryTmplVersion = this.jQueryTmplVersion = (function() {
if ((typeof(jQuery) == "undefined") || !(jQuery['tmpl']))
return 0;
// Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
try {
if (jQuery['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
// Since 1.0.0pre, custom tags should append markup to an array called "__"
return 2; // Final version of jquery.tmpl
}
} catch(ex) { /* Apparently not the version we were looking for */ }
return 1; // Any older version that we don't support
})();
function ensureHasReferencedJQueryTemplates() {
if (jQueryTmplVersion < 2)
throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
}
function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
return jQuery['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
}
this['renderTemplateSource'] = function(templateSource, bindingContext, options) {
options = options || {};
ensureHasReferencedJQueryTemplates();
// Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
var precompiled = templateSource['data']('precompiled');
if (!precompiled) {
var templateText = templateSource['text']() || "";
// Wrap in "with($whatever.koBindingContext) { ... }"
templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";
precompiled = jQuery['template'](null, templateText);
templateSource['data']('precompiled', precompiled);
}
var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
var jQueryTemplateOptions = jQuery['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
resultNodes['appendTo'](document.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
jQuery['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
return resultNodes;
};
this['createJavaScriptEvaluatorBlock'] = function(script) {
return "{{ko_code ((function() { return " + script + " })()) }}";
};
this['addTemplate'] = function(templateName, templateMarkup) {
document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "<" + "/script>");
};
if (jQueryTmplVersion > 0) {
jQuery['tmpl']['tag']['ko_code'] = {
open: "__.push($1 || '');"
};
jQuery['tmpl']['tag']['ko_with'] = {
open: "with($1) {",
close: "} "
};
}
};
ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();
ko.jqueryTmplTemplateEngine.prototype.constructor = ko.jqueryTmplTemplateEngine;
// Use this one by default *only if jquery.tmpl is referenced*
var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);
ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
})();
});
})(window,document,navigator,window["jQuery"]);
})();
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment