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<h3>event <span class="subtitle">3.0.0</span></h3>
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<div class="highlight" ><pre><span class="c">/**</span>
<span class="c"> * Adds event delegation support to the library.</span>
<span class="c"> * </span>
<span class="c"> * @module event</span>
<span class="c"> * @submodule event-delegate</span>
<span class="c"> */</span>
<span class="k">var</span> <span class="nx">Event</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">Event</span><span class="o">,</span>
<span class="nx">Lang</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">Lang</span><span class="o">,</span>
<span class="nx">delegates</span> <span class="o">=</span> <span class="o">{},</span>
<span class="nx">specialTypes</span> <span class="o">=</span> <span class="o">{</span>
<span class="nx">mouseenter</span><span class="o">:</span> <span class="s2">"mouseover"</span><span class="o">,</span>
<span class="nx">mouseleave</span><span class="o">:</span> <span class="s2">"mouseout"</span>
<span class="o">},</span>
<span class="nx">resolveTextNode</span> <span class="o">=</span> <span class="k">function</span><span class="o">(</span><span class="nx">n</span><span class="o">)</span> <span class="o">{</span>
<span class="k">try</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">n</span> <span class="o">&&</span> <span class="m">3</span> <span class="o">==</span> <span class="nx">n</span><span class="o">.</span><span class="nx">nodeType</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">n</span><span class="o">.</span><span class="nx">parentNode</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span> <span class="k">catch</span><span class="o">(</span><span class="nx">e</span><span class="o">)</span> <span class="o">{</span> <span class="o">}</span>
<span class="k">return</span> <span class="nx">n</span><span class="o">;</span>
<span class="o">},</span>
<span class="nx">delegateHandler</span> <span class="o">=</span> <span class="k">function</span><span class="o">(</span><span class="nx">delegateKey</span><span class="o">,</span> <span class="nx">e</span><span class="o">,</span> <span class="nx">el</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">target</span> <span class="o">=</span> <span class="nx">resolveTextNode</span><span class="o">((</span><span class="nx">e</span><span class="o">.</span><span class="nx">target</span> <span class="o">||</span> <span class="nx">e</span><span class="o">.</span><span class="nx">srcElement</span><span class="o">)),</span>
<span class="nx">tests</span> <span class="o">=</span> <span class="nx">delegates</span><span class="o">[</span><span class="nx">delegateKey</span><span class="o">],</span>
<span class="nx">spec</span><span class="o">,</span>
<span class="nx">ename</span><span class="o">,</span>
<span class="nx">matched</span><span class="o">,</span>
<span class="nx">fn</span><span class="o">,</span>
<span class="nx">ev</span><span class="o">;</span>
<span class="k">var</span> <span class="nx">getMatch</span> <span class="o">=</span> <span class="k">function</span><span class="o">(</span><span class="nx">el</span><span class="o">,</span> <span class="nx">selector</span><span class="o">,</span> <span class="nx">container</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">returnVal</span><span class="o">;</span>
<span class="k">if</span> <span class="o">(!</span><span class="nx">el</span> <span class="o">||</span> <span class="nx">el</span> <span class="o">===</span> <span class="nx">container</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">returnVal</span> <span class="o">=</span> <span class="kc">false</span><span class="o">;</span>
<span class="o">}</span>
<span class="k">else</span> <span class="o">{</span>
<span class="nx">returnVal</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">Selector</span><span class="o">.</span><span class="nx">test</span><span class="o">(</span><span class="nx">el</span><span class="o">,</span> <span class="nx">selector</span><span class="o">)</span> <span class="o">?</span> <span class="nx">el</span><span class="o">:</span> <span class="nx">getMatch</span><span class="o">(</span><span class="nx">el</span><span class="o">.</span><span class="nx">parentNode</span><span class="o">,</span> <span class="nx">selector</span><span class="o">,</span> <span class="nx">container</span><span class="o">);</span>
<span class="o">}</span>
<span class="k">return</span> <span class="nx">returnVal</span><span class="o">;</span>
<span class="o">};</span>
<span class="k">for</span> <span class="o">(</span><span class="nx">spec</span> <span class="k">in</span> <span class="nx">tests</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">tests</span><span class="o">.</span><span class="nx">hasOwnProperty</span><span class="o">(</span><span class="nx">spec</span><span class="o">))</span> <span class="o">{</span>
<span class="nx">ename</span> <span class="o">=</span> <span class="nx">tests</span><span class="o">[</span><span class="nx">spec</span><span class="o">];</span>
<span class="nx">fn</span> <span class="o">=</span> <span class="nx">tests</span><span class="o">.</span><span class="nx">fn</span><span class="o">;</span>
<span class="nx">matched</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">Y</span><span class="o">.</span><span class="nx">Selector</span><span class="o">.</span><span class="nx">test</span><span class="o">(</span><span class="nx">target</span><span class="o">,</span> <span class="nx">spec</span><span class="o">,</span> <span class="nx">el</span><span class="o">))</span> <span class="o">{</span>
<span class="nx">matched</span> <span class="o">=</span> <span class="nx">target</span><span class="o">;</span>
<span class="o">}</span>
<span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="nx">Y</span><span class="o">.</span><span class="nx">Selector</span><span class="o">.</span><span class="nx">test</span><span class="o">(</span><span class="nx">target</span><span class="o">,</span> <span class="o">((</span><span class="nx">spec</span><span class="o">.</span><span class="nx">replace</span><span class="o">(</span><span class="sr">/,/gi</span><span class="o">,</span> <span class="s2">" *,"</span><span class="o">))</span> <span class="o">+</span> <span class="s2">" *"</span><span class="o">),</span> <span class="nx">el</span><span class="o">))</span> <span class="o">{</span>
<span class="c">// The target is a descendant of an element matching </span>
<span class="c"></span> <span class="c">// the selector, so crawl up to find the ancestor that </span>
<span class="c"></span> <span class="c">// matches the selector</span>
<span class="c"></span>
<span class="nx">matched</span> <span class="o">=</span> <span class="nx">getMatch</span><span class="o">(</span><span class="nx">target</span><span class="o">,</span> <span class="nx">spec</span><span class="o">,</span> <span class="nx">el</span><span class="o">);</span>
<span class="o">}</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">matched</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(!</span><span class="nx">ev</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">ev</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">DOMEventFacade</span><span class="o">(</span><span class="nx">e</span><span class="o">,</span> <span class="nx">el</span><span class="o">);</span>
<span class="nx">ev</span><span class="o">.</span><span class="nx">container</span> <span class="o">=</span> <span class="nx">ev</span><span class="o">.</span><span class="nx">currentTarget</span><span class="o">;</span>
<span class="o">}</span>
<span class="nx">ev</span><span class="o">.</span><span class="nx">currentTarget</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">Node</span><span class="o">.</span><span class="nx">get</span><span class="o">(</span><span class="nx">matched</span><span class="o">);</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">publish</span><span class="o">(</span><span class="nx">ename</span><span class="o">,</span> <span class="o">{</span>
<span class="nx">contextFn</span><span class="o">:</span> <span class="k">function</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">ev</span><span class="o">.</span><span class="nx">currentTarget</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">});</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">fn</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">fn</span><span class="o">(</span><span class="nx">ev</span><span class="o">,</span> <span class="nx">ename</span><span class="o">);</span>
<span class="o">}</span>
<span class="k">else</span> <span class="o">{</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">fire</span><span class="o">(</span><span class="nx">ename</span><span class="o">,</span> <span class="nx">ev</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">},</span>
<span class="nx">attach</span> <span class="o">=</span> <span class="k">function</span> <span class="o">(</span><span class="nx">type</span><span class="o">,</span> <span class="nx">key</span><span class="o">,</span> <span class="nx">element</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">focusMethods</span> <span class="o">=</span> <span class="o">{</span>
<span class="nx">focus</span><span class="o">:</span> <span class="nx">Event</span><span class="o">.</span><span class="nx">_attachFocus</span><span class="o">,</span>
<span class="nx">blur</span><span class="o">:</span> <span class="nx">Event</span><span class="o">.</span><span class="nx">_attachBlur</span>
<span class="o">},</span>
<span class="nx">attachFn</span> <span class="o">=</span> <span class="nx">focusMethods</span><span class="o">[</span><span class="nx">type</span><span class="o">],</span>
<span class="nx">args</span> <span class="o">=</span> <span class="o">[</span><span class="nx">type</span><span class="o">,</span>
<span class="k">function</span> <span class="o">(</span><span class="nx">e</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">delegateHandler</span><span class="o">(</span><span class="nx">key</span><span class="o">,</span> <span class="o">(</span><span class="nx">e</span> <span class="o">||</span> <span class="nb">window</span><span class="o">.</span><span class="nx">event</span><span class="o">),</span> <span class="nx">element</span><span class="o">);</span>
<span class="o">},</span>
<span class="nx">element</span><span class="o">];</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">attachFn</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">attachFn</span><span class="o">(</span><span class="nx">args</span><span class="o">,</span> <span class="o">{</span> <span class="nx">capture</span><span class="o">:</span> <span class="kc">true</span><span class="o">,</span> <span class="nx">facade</span><span class="o">:</span> <span class="kc">false</span> <span class="o">});</span>
<span class="o">}</span>
<span class="k">else</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">Event</span><span class="o">.</span><span class="nx">_attach</span><span class="o">(</span><span class="nx">args</span><span class="o">,</span> <span class="o">{</span> <span class="nx">facade</span><span class="o">:</span> <span class="kc">false</span> <span class="o">});</span>
<span class="o">}</span>
<span class="o">},</span>
<span class="nx">sanitize</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">cached</span><span class="o">(</span><span class="k">function</span><span class="o">(</span><span class="nx">str</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="nx">str</span><span class="o">.</span><span class="nx">replace</span><span class="o">(</span><span class="sr">/[|,:]/g</span><span class="o">,</span> <span class="s1">'~'</span><span class="o">);</span>
<span class="o">});</span>
<span class="c">/**</span>
<span class="c"> * Sets up event delegation on a container element. The delegated event</span>
<span class="c"> * will use a supplied selector to test if the target or one of the</span>
<span class="c"> * descendants of the target match it. The supplied callback function </span>
<span class="c"> * will only be executed if a match was encountered, and, in fact, </span>
<span class="c"> * will be executed for each element that matches if you supply an </span>
<span class="c"> * ambiguous selector.</span>
<span class="c"> *</span>
<span class="c"> * The event object for the delegated event is supplied to the callback</span>
<span class="c"> * function. It is modified slightly in order to support all properties</span>
<span class="c"> * that may be needed for event delegation. 'currentTarget' is set to</span>
<span class="c"> * the element that matched the delegation specifcation. 'container' is</span>
<span class="c"> * set to the element that the listener is bound to (this normally would</span>
<span class="c"> * be the 'currentTarget').</span>
<span class="c"> *</span>
<span class="c"> * @event delegate</span>
<span class="c"> * @param type {string} 'delegate'</span>
<span class="c"> * @param fn {function} the callback function to execute. This function</span>
<span class="c"> * will be provided the event object for the delegated event.</span>
<span class="c"> * @param el {string|node} the element that is the delegation container</span>
<span class="c"> * @param delegateType {string} the event type to delegate</span>
<span class="c"> * @param spec {string} a selector that must match the target of the</span>
<span class="c"> * event.</span>
<span class="c"> * @param context optional argument that specifies what 'this' refers to.</span>
<span class="c"> * @param args* 0..n additional arguments to pass on to the callback function.</span>
<span class="c"> * These arguments will be added after the event object.</span>
<span class="c"> * @return {EventHandle} the detach handle</span>
<span class="c"> * @for YUI</span>
<span class="c"> * @deprecated use Y.delegate</span>
<span class="c"> */</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">Env</span><span class="o">.</span><span class="nx">evt</span><span class="o">.</span><span class="nx">plugins</span><span class="o">.</span><span class="nx">delegate</span> <span class="o">=</span> <span class="o">{</span>
<span class="nx">on</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">type</span><span class="o">,</span> <span class="nx">fn</span><span class="o">,</span> <span class="nx">el</span><span class="o">,</span> <span class="nx">delegateType</span><span class="o">,</span> <span class="nx">spec</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s1">'delegate event is deprecated, use Y.delegate()'</span><span class="o">,</span> <span class="s1">'warn'</span><span class="o">,</span> <span class="s1">'deprecated'</span><span class="o">);</span>
<span class="k">var</span> <span class="nx">args</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nb">Array</span><span class="o">(</span><span class="nx">arguments</span><span class="o">,</span> <span class="m">0</span><span class="o">,</span> <span class="kc">true</span><span class="o">);</span>
<span class="nx">args</span><span class="o">.</span><span class="nx">splice</span><span class="o">(</span><span class="m">3</span><span class="o">,</span> <span class="m">1</span><span class="o">);</span>
<span class="nx">args</span><span class="o">[</span><span class="m">0</span><span class="o">]</span> <span class="o">=</span> <span class="nx">delegateType</span><span class="o">;</span>
<span class="k">return</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">delegate</span><span class="o">.</span><span class="nx">apply</span><span class="o">(</span><span class="nx">Y</span><span class="o">,</span> <span class="nx">args</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">};</span>
<span class="c">/**</span>
<span class="c"> * Sets up event delegation on a container element. The delegated event</span>
<span class="c"> * will use a supplied selector to test if the target or one of the</span>
<span class="c"> * descendants of the target match it. The supplied callback function </span>
<span class="c"> * will only be executed if a match was encountered, and, in fact, </span>
<span class="c"> * will be executed for each element that matches if you supply an </span>
<span class="c"> * ambiguous selector.</span>
<span class="c"> *</span>
<span class="c"> * The event object for the delegated event is supplied to the callback</span>
<span class="c"> * function. It is modified slightly in order to support all properties</span>
<span class="c"> * that may be needed for event delegation. 'currentTarget' is set to</span>
<span class="c"> * the element that matched the delegation specifcation. 'container' is</span>
<span class="c"> * set to the element that the listener is bound to (this normally would</span>
<span class="c"> * be the 'currentTarget').</span>
<span class="c"> *</span>
<span class="c"> * @method delegate</span>
<span class="c"> * @param type {string} the event type to delegate</span>
<span class="c"> * @param fn {function} the callback function to execute. This function</span>
<span class="c"> * will be provided the event object for the delegated event.</span>
<span class="c"> * @param el {string|node} the element that is the delegation container</span>
<span class="c"> * @param spec {string} a selector that must match the target of the</span>
<span class="c"> * event.</span>
<span class="c"> * @param context optional argument that specifies what 'this' refers to.</span>
<span class="c"> * @param args* 0..n additional arguments to pass on to the callback function.</span>
<span class="c"> * These arguments will be added after the event object.</span>
<span class="c"> * @return {EventHandle} the detach handle</span>
<span class="c"> * @for YUI</span>
<span class="c"> */</span>
<span class="nx">Event</span><span class="o">.</span><span class="nx">delegate</span> <span class="o">=</span> <span class="k">function</span> <span class="o">(</span><span class="nx">type</span><span class="o">,</span> <span class="nx">fn</span><span class="o">,</span> <span class="nx">el</span><span class="o">,</span> <span class="nx">spec</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(!</span><span class="nx">spec</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s1">'delegate: no spec, nothing to do'</span><span class="o">,</span> <span class="s1">'warn'</span><span class="o">,</span> <span class="s1">'event'</span><span class="o">);</span>
<span class="k">return</span> <span class="kc">false</span><span class="o">;</span>
<span class="o">}</span>
<span class="k">var</span> <span class="nx">args</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nb">Array</span><span class="o">(</span><span class="nx">arguments</span><span class="o">,</span> <span class="m">0</span><span class="o">,</span> <span class="kc">true</span><span class="o">),</span>
<span class="nx">element</span> <span class="o">=</span> <span class="nx">el</span><span class="o">,</span> <span class="c">// HTML element serving as the delegation container</span>
<span class="c"></span> <span class="nx">availHandle</span><span class="o">;</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">Lang</span><span class="o">.</span><span class="nx">isString</span><span class="o">(</span><span class="nx">el</span><span class="o">))</span> <span class="o">{</span>
<span class="c">// Y.Selector.query returns an array of matches unless specified </span>
<span class="c"></span> <span class="c">// to return just the first match. Since the primary use case for</span>
<span class="c"></span> <span class="c">// event delegation is to use a single event handler on a container,</span>
<span class="c"></span> <span class="c">// Y.delegate doesn't currently support being able to bind a </span>
<span class="c"></span> <span class="c">// single listener to multiple containers.</span>
<span class="c"></span>
<span class="nx">element</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">Selector</span><span class="o">.</span><span class="nx">query</span><span class="o">(</span><span class="nx">el</span><span class="o">,</span> <span class="kc">null</span><span class="o">,</span> <span class="kc">true</span><span class="o">);</span>
<span class="k">if</span> <span class="o">(!</span><span class="nx">element</span><span class="o">)</span> <span class="o">{</span> <span class="c">// Not found, check using onAvailable</span>
<span class="c"></span>
<span class="nx">availHandle</span> <span class="o">=</span> <span class="nx">Event</span><span class="o">.</span><span class="nx">onAvailable</span><span class="o">(</span><span class="nx">el</span><span class="o">,</span> <span class="k">function</span><span class="o">()</span> <span class="o">{</span>
<span class="nx">availHandle</span><span class="o">.</span><span class="nx">handle</span> <span class="o">=</span> <span class="nx">Event</span><span class="o">.</span><span class="nx">delegate</span><span class="o">.</span><span class="nx">apply</span><span class="o">(</span><span class="nx">Event</span><span class="o">,</span> <span class="nx">args</span><span class="o">);</span>
<span class="o">},</span> <span class="nx">Event</span><span class="o">,</span> <span class="kc">true</span><span class="o">,</span> <span class="kc">false</span><span class="o">);</span>
<span class="k">return</span> <span class="nx">availHandle</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="nx">element</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">Node</span><span class="o">.</span><span class="nx">getDOMNode</span><span class="o">(</span><span class="nx">element</span><span class="o">);</span>
<span class="k">var</span> <span class="nx">guid</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">stamp</span><span class="o">(</span><span class="nx">element</span><span class="o">),</span>
<span class="c">// The Custom Event for the delegation spec</span>
<span class="c"></span> <span class="nx">ename</span> <span class="o">=</span> <span class="s1">'delegate:'</span> <span class="o">+</span> <span class="nx">guid</span> <span class="o">+</span> <span class="nx">type</span> <span class="o">+</span> <span class="nx">sanitize</span><span class="o">(</span><span class="nx">spec</span><span class="o">),</span>
<span class="c">// The key to the listener for the event type and container</span>
<span class="c"></span> <span class="nx">delegateKey</span> <span class="o">=</span> <span class="nx">type</span> <span class="o">+</span> <span class="nx">guid</span><span class="o">,</span>
<span class="nx">delegate</span> <span class="o">=</span> <span class="nx">delegates</span><span class="o">[</span><span class="nx">delegateKey</span><span class="o">],</span>
<span class="nx">domEventHandle</span><span class="o">,</span>
<span class="nx">ceHandle</span><span class="o">,</span>
<span class="nx">listeners</span><span class="o">;</span>
<span class="k">if</span> <span class="o">(!</span><span class="nx">delegate</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">delegate</span> <span class="o">=</span> <span class="o">{};</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">specialTypes</span><span class="o">[</span><span class="nx">type</span><span class="o">])</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(!</span><span class="nx">Event</span><span class="o">.</span><span class="nx">_fireMouseEnter</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s2">"Delegating a "</span> <span class="o">+</span> <span class="nx">type</span> <span class="o">+</span> <span class="s2">" event requires the event-mouseenter submodule."</span><span class="o">,</span> <span class="s2">"error"</span><span class="o">,</span> <span class="s2">"Event"</span><span class="o">);</span>
<span class="k">return</span> <span class="kc">false</span><span class="o">;</span>
<span class="o">}</span>
<span class="nx">type</span> <span class="o">=</span> <span class="nx">specialTypes</span><span class="o">[</span><span class="nx">type</span><span class="o">];</span>
<span class="nx">delegate</span><span class="o">.</span><span class="nx">fn</span> <span class="o">=</span> <span class="nx">Event</span><span class="o">.</span><span class="nx">_fireMouseEnter</span><span class="o">;</span>
<span class="o">}</span>
<span class="c">// Create the DOM Event wrapper that will fire the Custom Event</span>
<span class="c"></span>
<span class="nx">domEventHandle</span> <span class="o">=</span> <span class="nx">attach</span><span class="o">(</span><span class="nx">type</span><span class="o">,</span> <span class="nx">delegateKey</span><span class="o">,</span> <span class="nx">element</span><span class="o">);</span>
<span class="c">// Hook into the _delete method for the Custom Event wrapper of this</span>
<span class="c"></span> <span class="c">// DOM Event in order to clean up the 'delegates' map and unsubscribe</span>
<span class="c"></span> <span class="c">// the associated Custom Event listeners fired by this DOM event</span>
<span class="c"></span> <span class="c">// listener if/when the user calls "purgeElement" OR removes all </span>
<span class="c"></span> <span class="c">// listeners of the Custom Event.</span>
<span class="c"></span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">after</span><span class="o">(</span><span class="k">function</span> <span class="o">(</span><span class="nx">sub</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">domEventHandle</span><span class="o">.</span><span class="nx">sub</span> <span class="o">==</span> <span class="nx">sub</span><span class="o">)</span> <span class="o">{</span>
<span class="c">// Delete this event from the map of known delegates</span>
<span class="c"></span> <span class="nx">delete</span> <span class="nx">delegates</span><span class="o">[</span><span class="nx">delegateKey</span><span class="o">];</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s2">"DOM event listener associated with the "</span> <span class="o">+</span> <span class="nx">ename</span> <span class="o">+</span> <span class="s2">" Custom Event removed. Removing all "</span> <span class="o">+</span> <span class="nx">ename</span> <span class="o">+</span> <span class="s2">" listeners."</span><span class="o">,</span> <span class="s2">"info"</span><span class="o">,</span> <span class="s2">"Event"</span><span class="o">);</span>
<span class="c">// Unsubscribe all listeners of the Custom Event fired </span>
<span class="c"></span> <span class="c">// by this DOM event.</span>
<span class="c"></span> <span class="nx">Y</span><span class="o">.</span><span class="nx">detachAll</span><span class="o">(</span><span class="nx">ename</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">},</span> <span class="nx">domEventHandle</span><span class="o">.</span><span class="nx">evt</span><span class="o">,</span> <span class="s2">"_delete"</span><span class="o">);</span>
<span class="nx">delegate</span><span class="o">.</span><span class="nx">handle</span> <span class="o">=</span> <span class="nx">domEventHandle</span><span class="o">;</span>
<span class="nx">delegates</span><span class="o">[</span><span class="nx">delegateKey</span><span class="o">]</span> <span class="o">=</span> <span class="nx">delegate</span><span class="o">;</span>
<span class="o">}</span>
<span class="nx">listeners</span> <span class="o">=</span> <span class="nx">delegate</span><span class="o">.</span><span class="nx">listeners</span><span class="o">;</span>
<span class="nx">delegate</span><span class="o">.</span><span class="nx">listeners</span> <span class="o">=</span> <span class="nx">listeners</span> <span class="o">?</span> <span class="o">(</span><span class="nx">listeners</span> <span class="o">+</span> <span class="m">1</span><span class="o">)</span> <span class="o">:</span> <span class="m">1</span><span class="o">;</span>
<span class="nx">delegate</span><span class="o">[</span><span class="nx">spec</span><span class="o">]</span> <span class="o">=</span> <span class="nx">ename</span><span class="o">;</span>
<span class="nx">args</span><span class="o">[</span><span class="m">0</span><span class="o">]</span> <span class="o">=</span> <span class="nx">ename</span><span class="o">;</span>
<span class="c">// Remove element, delegation spec</span>
<span class="c"></span> <span class="nx">args</span><span class="o">.</span><span class="nx">splice</span><span class="o">(</span><span class="m">2</span><span class="o">,</span> <span class="m">2</span><span class="o">);</span>
<span class="c">// Subscribe to the Custom Event for the delegation spec</span>
<span class="c"></span>
<span class="nx">ceHandle</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">on</span><span class="o">.</span><span class="nx">apply</span><span class="o">(</span><span class="nx">Y</span><span class="o">,</span> <span class="nx">args</span><span class="o">);</span>
<span class="c">// Hook into the detach method of the handle in order to clean up the </span>
<span class="c"></span> <span class="c">// 'delegates' map and remove the associated DOM event handler </span>
<span class="c"></span> <span class="c">// responsible for firing this Custom Event if all listener for this </span>
<span class="c"></span> <span class="c">// event have been removed.</span>
<span class="c"></span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">after</span><span class="o">(</span><span class="k">function</span> <span class="o">()</span> <span class="o">{</span>
<span class="nx">delegate</span><span class="o">.</span><span class="nx">listeners</span> <span class="o">=</span> <span class="o">(</span><span class="nx">delegate</span><span class="o">.</span><span class="nx">listeners</span> <span class="o">-</span> <span class="m">1</span><span class="o">);</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">delegate</span><span class="o">.</span><span class="nx">listeners</span> <span class="o">===</span> <span class="m">0</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s2">"No more listeners for the "</span> <span class="o">+</span> <span class="nx">ename</span> <span class="o">+</span> <span class="s2">" Custom Event. Removing its associated DOM event listener."</span><span class="o">,</span> <span class="s2">"info"</span><span class="o">,</span> <span class="s2">"Event"</span><span class="o">);</span>
<span class="nx">delegate</span><span class="o">.</span><span class="nx">handle</span><span class="o">.</span><span class="nx">detach</span><span class="o">();</span>
<span class="o">}</span>
<span class="o">},</span> <span class="nx">ceHandle</span><span class="o">,</span> <span class="s2">"detach"</span><span class="o">);</span>
<span class="k">return</span> <span class="nx">ceHandle</span><span class="o">;</span>
<span class="o">};</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">delegate</span> <span class="o">=</span> <span class="nx">Event</span><span class="o">.</span><span class="nx">delegate</span><span class="o">;</span>
</pre></div>
</div>
</div>
</div>
<div class="yui-b">
<div class="nav">
<div id="moduleList" class="module">
<h4>Modules</h4>
<ul class="content">
<li class=""><a href="module_anim.html" title="anim">anim</a></li>
<li class=""><a href="module_async-queue.html" title="async-queue">async-queue</a></li>
<li class=""><a href="module_attribute.html" title="attribute">attribute</a></li>
<li class=""><a href="module_base.html" title="base">base</a></li>
<li class=""><a href="module_cache.html" title="cache">cache</a></li>
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<li class=""><a href="module_collection.html" title="collection">collection</a></li>
<li class=""><a href="module_console.html" title="console">console</a></li>
<li class=""><a href="module_console-filters.html" title="console-filters">console-filters</a></li>
<li class=""><a href="module_cookie.html" title="cookie">cookie</a></li>
<li class=""><a href="module_dataschema.html" title="dataschema">dataschema</a></li>
<li class=""><a href="module_datasource.html" title="datasource">datasource</a></li>
<li class=""><a href="module_datatype.html" title="datatype">datatype</a></li>
<li class=""><a href="module_dd.html" title="dd">dd</a></li>
<li class=""><a href="module_dom.html" title="dom">dom</a></li>
<li class=""><a href="module_dump.html" title="dump">dump</a></li>
<li class="selected"><a href="module_event.html" title="event">event</a></li>
<li class=""><a href="module_event-custom.html" title="event-custom">event-custom</a></li>
<li class=""><a href="module_event-simulate.html" title="event-simulate">event-simulate</a></li>
<li class=""><a href="module_history.html" title="history">history</a></li>
<li class=""><a href="module_imageloader.html" title="imageloader">imageloader</a></li>
<li class=""><a href="module_io.html" title="io">io</a></li>
<li class=""><a href="module_json.html" title="json">json</a></li>
<li class=""><a href="module_node.html" title="node">node</a></li>
<li class=""><a href="module_node-focusmanager.html" title="node-focusmanager">node-focusmanager</a></li>
<li class=""><a href="module_node-menunav.html" title="node-menunav">node-menunav</a></li>
<li class=""><a href="module_oop.html" title="oop">oop</a></li>
<li class=""><a href="module_overlay.html" title="overlay">overlay</a></li>
<li class=""><a href="module_plugin.html" title="plugin">plugin</a></li>
<li class=""><a href="module_profiler.html" title="profiler">profiler</a></li>
<li class=""><a href="module_queue-promote.html" title="queue-promote">queue-promote</a></li>
<li class=""><a href="module_slider.html" title="slider">slider</a></li>
<li class=""><a href="module_stylesheet.html" title="stylesheet">stylesheet</a></li>
<li class=""><a href="module_substitute.html" title="substitute">substitute</a></li>
<li class=""><a href="module_test.html" title="test">test</a></li>
<li class=""><a href="module_widget.html" title="widget">widget</a></li>
<li class=""><a href="module_widget-position.html" title="widget-position">widget-position</a></li>
<li class=""><a href="module_widget-position-ext.html" title="widget-position-ext">widget-position-ext</a></li>
<li class=""><a href="module_widget-stack.html" title="widget-stack">widget-stack</a></li>
<li class=""><a href="module_widget-stdmod.html" title="widget-stdmod">widget-stdmod</a></li>
<li class=""><a href="module_yui.html" title="yui">yui</a></li>
</ul>
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<div id="classList" class="module">
<h4>Classes</h4>
<ul class="content">
<li class=""><a href="DOMEventFacade.html" title="DOMEventFacade">DOMEventFacade</a></li>
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</ul>
</div>
<div id="fileList" class="module">
<h4>Files</h4>
<ul class="content">
<li class=""><a href="available.js.html" title="available.js">available.js</a></li>
<li class="selected"><a href="delegate.js.html" title="delegate.js">delegate.js</a></li>
<li class=""><a href="event-dom.js.html" title="event-dom.js">event-dom.js</a></li>
<li class=""><a href="event-facade-dom.js.html" title="event-facade-dom.js">event-facade-dom.js</a></li>
<li class=""><a href="event-ready-base.js.html" title="event-ready-base.js">event-ready-base.js</a></li>
<li class=""><a href="event-ready.js.html" title="event-ready.js">event-ready.js</a></li>
<li class=""><a href="focusblur.js.html" title="focusblur.js">focusblur.js</a></li>
<li class=""><a href="key.js.html" title="key.js">key.js</a></li>
<li class=""><a href="mouseentermouseleave.js.html" title="mouseentermouseleave.js">mouseentermouseleave.js</a></li>
<li class=""><a href="mousewheel.js.html" title="mousewheel.js">mousewheel.js</a></li>
<li class=""><a href="resize-window.js.html" title="resize-window.js">resize-window.js</a></li>
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<div id="ft">
<hr />
Copyright © 2009 Yahoo! Inc. All rights reserved.
</div>
</div>
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