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comparison rhodecode/public/js/yui/event-delegate/event-delegate.js @ 547:1e757ac98988

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renamed project to rhodecode
author Marcin Kuzminski <marcin@python-works.com>
date Wed, 06 Oct 2010 03:18:16 +0200
parents pylons_app/public/js/yui/event-delegate/event-delegate.js@564e40829f80
children 289ff43cc190
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546:7c2f5e4d7bbf 547:1e757ac98988
1 /*
2 Copyright (c) 2009, Yahoo! Inc. All rights reserved.
3 Code licensed under the BSD License:
4 http://developer.yahoo.net/yui/license.txt
5 version: 2.8.0r4
6 */
7 /**
8 * Augments the Event Utility with a <code>delegate</code> method that
9 * facilitates easy creation of delegated event listeners. (Note: Using CSS
10 * selectors as the filtering criteria for delegated event listeners requires
11 * inclusion of the Selector Utility.)
12 *
13 * @module event-delegate
14 * @title Event Utility Event Delegation Module
15 * @namespace YAHOO.util
16 * @requires event
17 */
18
19 (function () {
20
21 var Event = YAHOO.util.Event,
22 Lang = YAHOO.lang,
23 delegates = [],
24
25
26 getMatch = function(el, selector, container) {
27
28 var returnVal;
29
30 if (!el || el === container) {
31 returnVal = false;
32 }
33 else {
34 returnVal = YAHOO.util.Selector.test(el, selector) ? el: getMatch(el.parentNode, selector, container);
35 }
36
37 return returnVal;
38
39 };
40
41
42 Lang.augmentObject(Event, {
43
44 /**
45 * Creates a delegate function used to call event listeners specified
46 * via the <code>YAHOO.util.Event.delegate</code> method.
47 *
48 * @method _createDelegate
49 *
50 * @param {Function} fn The method (event listener) to call.
51 * @param {Function|string} filter Function or CSS selector used to
52 * determine for what element(s) the event listener should be called.
53 * @param {Object} obj An arbitrary object that will be
54 * passed as a parameter to the listener.
55 * @param {Boolean|object} overrideContext If true, the value of the
56 * obj parameter becomes the execution context
57 * of the listener. If an object, this object
58 * becomes the execution context.
59 * @return {Function} Function that will call the event listener
60 * specified by the <code>YAHOO.util.Event.delegate</code> method.
61 * @private
62 * @for Event
63 * @static
64 */
65 _createDelegate: function (fn, filter, obj, overrideContext) {
66
67 return function (event) {
68
69 var container = this,
70 target = Event.getTarget(event),
71 selector = filter,
72
73 // The user might have specified the document object
74 // as the delegation container, in which case it is not
75 // nessary to scope the provided CSS selector(s) to the
76 // delegation container
77 bDocument = (container.nodeType === 9),
78
79 matchedEl,
80 context,
81 sID,
82 sIDSelector;
83
84
85 if (Lang.isFunction(filter)) {
86 matchedEl = filter(target);
87 }
88 else if (Lang.isString(filter)) {
89
90 if (!bDocument) {
91
92 sID = container.id;
93
94 if (!sID) {
95 sID = Event.generateId(container);
96 }
97
98 // Scope all selectors to the container
99 sIDSelector = ("#" + sID + " ");
100 selector = (sIDSelector + filter).replace(/,/gi, ("," + sIDSelector));
101
102 }
103
104
105 if (YAHOO.util.Selector.test(target, selector)) {
106 matchedEl = target;
107 }
108 else if (YAHOO.util.Selector.test(target, ((selector.replace(/,/gi, " *,")) + " *"))) {
109
110 // The target is a descendant of an element matching
111 // the selector, so crawl up to find the ancestor that
112 // matches the selector
113
114 matchedEl = getMatch(target, selector, container);
115
116 }
117
118 }
119
120
121 if (matchedEl) {
122
123 // The default context for delegated listeners is the
124 // element that matched the filter.
125
126 context = matchedEl;
127
128 if (overrideContext) {
129 if (overrideContext === true) {
130 context = obj;
131 } else {
132 context = overrideContext;
133 }
134 }
135
136 // Call the listener passing in the container and the
137 // element that matched the filter in case the user
138 // needs those.
139
140 return fn.call(context, event, matchedEl, container, obj);
141
142 }
143
144 };
145
146 },
147
148
149 /**
150 * Appends a delegated event listener. Delegated event listeners
151 * receive three arguments by default: the DOM event, the element
152 * specified by the filtering function or CSS selector, and the
153 * container element (the element to which the event listener is
154 * bound). (Note: Using the delegate method requires the event-delegate
155 * module. Using CSS selectors as the filtering criteria for delegated
156 * event listeners requires inclusion of the Selector Utility.)
157 *
158 * @method delegate
159 *
160 * @param {String|HTMLElement|Array|NodeList} container An id, an element
161 * reference, or a collection of ids and/or elements to assign the
162 * listener to.
163 * @param {String} type The type of event listener to append
164 * @param {Function} fn The method the event invokes
165 * @param {Function|string} filter Function or CSS selector used to
166 * determine for what element(s) the event listener should be called.
167 * When a function is specified, the function should return an
168 * HTML element. Using a CSS Selector requires the inclusion of the
169 * CSS Selector Utility.
170 * @param {Object} obj An arbitrary object that will be
171 * passed as a parameter to the listener
172 * @param {Boolean|object} overrideContext If true, the value of the obj parameter becomes
173 * the execution context of the listener. If an
174 * object, this object becomes the execution
175 * context.
176 * @return {Boolean} Returns true if the action was successful or defered,
177 * false if one or more of the elements
178 * could not have the listener attached,
179 * or if the operation throws an exception.
180 * @static
181 * @for Event
182 */
183 delegate: function (container, type, fn, filter, obj, overrideContext) {
184
185 var sType = type,
186 fnMouseDelegate,
187 fnDelegate;
188
189
190 if (Lang.isString(filter) && !YAHOO.util.Selector) {
191 return false;
192 }
193
194
195 if (type == "mouseenter" || type == "mouseleave") {
196
197 if (!Event._createMouseDelegate) {
198 return false;
199 }
200
201 // Look up the real event--either mouseover or mouseout
202 sType = Event._getType(type);
203
204 fnMouseDelegate = Event._createMouseDelegate(fn, obj, overrideContext);
205
206 fnDelegate = Event._createDelegate(function (event, matchedEl, container) {
207
208 return fnMouseDelegate.call(matchedEl, event, container);
209
210 }, filter, obj, overrideContext);
211
212 }
213 else {
214
215 fnDelegate = Event._createDelegate(fn, filter, obj, overrideContext);
216
217 }
218
219 delegates.push([container, sType, fn, fnDelegate]);
220
221 return Event.on(container, sType, fnDelegate);
222
223 },
224
225
226 /**
227 * Removes a delegated event listener.
228 *
229 * @method removeDelegate
230 *
231 * @param {String|HTMLElement|Array|NodeList} container An id, an element
232 * reference, or a collection of ids and/or elements to remove
233 * the listener from.
234 * @param {String} type The type of event to remove.
235 * @param {Function} fn The method the event invokes. If fn is
236 * undefined, then all event listeners for the type of event are
237 * removed.
238 * @return {boolean} Returns true if the unbind was successful, false
239 * otherwise.
240 * @static
241 * @for Event
242 */
243 removeDelegate: function (container, type, fn) {
244
245 var sType = type,
246 returnVal = false,
247 index,
248 cacheItem;
249
250 // Look up the real event--either mouseover or mouseout
251 if (type == "mouseenter" || type == "mouseleave") {
252 sType = Event._getType(type);
253 }
254
255 index = Event._getCacheIndex(delegates, container, sType, fn);
256
257 if (index >= 0) {
258 cacheItem = delegates[index];
259 }
260
261
262 if (container && cacheItem) {
263
264 returnVal = Event.removeListener(cacheItem[0], cacheItem[1], cacheItem[3]);
265
266 if (returnVal) {
267 delete delegates[index][2];
268 delete delegates[index][3];
269 delegates.splice(index, 1);
270 }
271
272 }
273
274 return returnVal;
275
276 }
277
278 });
279
280 }());
281 YAHOO.register("event-delegate", YAHOO.util.Event, {version: "2.8.0r4", build: "2449"});