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<meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"><meta http-equiv="Content-Language" content="en"><meta http-equiv="X-UA-Compatible" content="IE=edge"><title>eventtarget.js</title><link href="../../../../dossier.css" rel="stylesheet" type="text/css"><header><div><form><div><input type="search" placeholder="Search"></div></form></div></header><main><article class="srcfile"><h1>lib/goog/events/eventtarget.js</h1><div><table><tr><td><a id="l1"></a><a href="#l1">1</a><td>// Copyright 2005 The Closure Library Authors. All Rights Reserved.<tr><td><a id="l2"></a><a href="#l2">2</a><td>//<tr><td><a id="l3"></a><a href="#l3">3</a><td>// Licensed under the Apache License, Version 2.0 (the "License");<tr><td><a id="l4"></a><a href="#l4">4</a><td>// you may not use this file except in compliance with the License.<tr><td><a id="l5"></a><a href="#l5">5</a><td>// You may obtain a copy of the License at<tr><td><a id="l6"></a><a href="#l6">6</a><td>//<tr><td><a id="l7"></a><a href="#l7">7</a><td>// http://www.apache.org/licenses/LICENSE-2.0<tr><td><a id="l8"></a><a href="#l8">8</a><td>//<tr><td><a id="l9"></a><a href="#l9">9</a><td>// Unless required by applicable law or agreed to in writing, software<tr><td><a id="l10"></a><a href="#l10">10</a><td>// distributed under the License is distributed on an "AS-IS" BASIS,<tr><td><a id="l11"></a><a href="#l11">11</a><td>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<tr><td><a id="l12"></a><a href="#l12">12</a><td>// See the License for the specific language governing permissions and<tr><td><a id="l13"></a><a href="#l13">13</a><td>// limitations under the License.<tr><td><a id="l14"></a><a href="#l14">14</a><td><tr><td><a id="l15"></a><a href="#l15">15</a><td>/**<tr><td><a id="l16"></a><a href="#l16">16</a><td> * @fileoverview A disposable implementation of a custom<tr><td><a id="l17"></a><a href="#l17">17</a><td> * listenable/event target. See also: documentation for<tr><td><a id="l18"></a><a href="#l18">18</a><td> * {@code goog.events.Listenable}.<tr><td><a id="l19"></a><a href="#l19">19</a><td> *<tr><td><a id="l20"></a><a href="#l20">20</a><td> * @author arv@google.com (Erik Arvidsson) [Original implementation]<tr><td><a id="l21"></a><a href="#l21">21</a><td> * @see ../demos/eventtarget.html<tr><td><a id="l22"></a><a href="#l22">22</a><td> * @see goog.events.Listenable<tr><td><a id="l23"></a><a href="#l23">23</a><td> */<tr><td><a id="l24"></a><a href="#l24">24</a><td><tr><td><a id="l25"></a><a href="#l25">25</a><td>goog.provide('goog.events.EventTarget');<tr><td><a id="l26"></a><a href="#l26">26</a><td><tr><td><a id="l27"></a><a href="#l27">27</a><td>goog.require('goog.Disposable');<tr><td><a id="l28"></a><a href="#l28">28</a><td>goog.require('goog.asserts');<tr><td><a id="l29"></a><a href="#l29">29</a><td>goog.require('goog.events');<tr><td><a id="l30"></a><a href="#l30">30</a><td>goog.require('goog.events.Event');<tr><td><a id="l31"></a><a href="#l31">31</a><td>goog.require('goog.events.Listenable');<tr><td><a id="l32"></a><a href="#l32">32</a><td>goog.require('goog.events.ListenerMap');<tr><td><a id="l33"></a><a href="#l33">33</a><td>goog.require('goog.object');<tr><td><a id="l34"></a><a href="#l34">34</a><td><tr><td><a id="l35"></a><a href="#l35">35</a><td><tr><td><a id="l36"></a><a href="#l36">36</a><td><tr><td><a id="l37"></a><a href="#l37">37</a><td>/**<tr><td><a id="l38"></a><a href="#l38">38</a><td> * An implementation of {@code goog.events.Listenable} with full W3C<tr><td><a id="l39"></a><a href="#l39">39</a><td> * EventTarget-like support (capture/bubble mechanism, stopping event<tr><td><a id="l40"></a><a href="#l40">40</a><td> * propagation, preventing default actions).<tr><td><a id="l41"></a><a href="#l41">41</a><td> *<tr><td><a id="l42"></a><a href="#l42">42</a><td> * You may subclass this class to turn your class into a Listenable.<tr><td><a id="l43"></a><a href="#l43">43</a><td> *<tr><td><a id="l44"></a><a href="#l44">44</a><td> * Unless propagation is stopped, an event dispatched by an<tr><td><a id="l45"></a><a href="#l45">45</a><td> * EventTarget will bubble to the parent returned by<tr><td><a id="l46"></a><a href="#l46">46</a><td> * {@code getParentEventTarget}. To set the parent, call<tr><td><a id="l47"></a><a href="#l47">47</a><td> * {@code setParentEventTarget}. Subclasses that don't support<tr><td><a id="l48"></a><a href="#l48">48</a><td> * changing the parent can override the setter to throw an error.<tr><td><a id="l49"></a><a href="#l49">49</a><td> *<tr><td><a id="l50"></a><a href="#l50">50</a><td> * Example usage:<tr><td><a id="l51"></a><a href="#l51">51</a><td> * <pre><tr><td><a id="l52"></a><a href="#l52">52</a><td> * var source = new goog.events.EventTarget();<tr><td><a id="l53"></a><a href="#l53">53</a><td> * function handleEvent(e) {<tr><td><a id="l54"></a><a href="#l54">54</a><td> * alert('Type: ' + e.type + '; Target: ' + e.target);<tr><td><a id="l55"></a><a href="#l55">55</a><td> * }<tr><td><a id="l56"></a><a href="#l56">56</a><td> * source.listen('foo', handleEvent);<tr><td><a id="l57"></a><a href="#l57">57</a><td> * // Or: goog.events.listen(source, 'foo', handleEvent);<tr><td><a id="l58"></a><a href="#l58">58</a><td> * ...<tr><td><a id="l59"></a><a href="#l59">59</a><td> * source.dispatchEvent('foo'); // will call handleEvent<tr><td><a id="l60"></a><a href="#l60">60</a><td> * ...<tr><td><a id="l61"></a><a href="#l61">61</a><td> * source.unlisten('foo', handleEvent);<tr><td><a id="l62"></a><a href="#l62">62</a><td> * // Or: goog.events.unlisten(source, 'foo', handleEvent);<tr><td><a id="l63"></a><a href="#l63">63</a><td> * </pre><tr><td><a id="l64"></a><a href="#l64">64</a><td> *<tr><td><a id="l65"></a><a href="#l65">65</a><td> * @constructor<tr><td><a id="l66"></a><a href="#l66">66</a><td> * @extends {goog.Disposable}<tr><td><a id="l67"></a><a href="#l67">67</a><td> * @implements {goog.events.Listenable}<tr><td><a id="l68"></a><a href="#l68">68</a><td> */<tr><td><a id="l69"></a><a href="#l69">69</a><td>goog.events.EventTarget = function() {<tr><td><a id="l70"></a><a href="#l70">70</a><td> goog.Disposable.call(this);<tr><td><a id="l71"></a><a href="#l71">71</a><td><tr><td><a id="l72"></a><a href="#l72">72</a><td> /**<tr><td><a id="l73"></a><a href="#l73">73</a><td> * Maps of event type to an array of listeners.<tr><td><a id="l74"></a><a href="#l74">74</a><td> * @private {!goog.events.ListenerMap}<tr><td><a id="l75"></a><a href="#l75">75</a><td> */<tr><td><a id="l76"></a><a href="#l76">76</a><td> this.eventTargetListeners_ = new goog.events.ListenerMap(this);<tr><td><a id="l77"></a><a href="#l77">77</a><td><tr><td><a id="l78"></a><a href="#l78">78</a><td> /**<tr><td><a id="l79"></a><a href="#l79">79</a><td> * The object to use for event.target. Useful when mixing in an<tr><td><a id="l80"></a><a href="#l80">80</a><td> * EventTarget to another object.<tr><td><a id="l81"></a><a href="#l81">81</a><td> * @private {!Object}<tr><td><a id="l82"></a><a href="#l82">82</a><td> */<tr><td><a id="l83"></a><a href="#l83">83</a><td> this.actualEventTarget_ = this;<tr><td><a id="l84"></a><a href="#l84">84</a><td><tr><td><a id="l85"></a><a href="#l85">85</a><td> /**<tr><td><a id="l86"></a><a href="#l86">86</a><td> * Parent event target, used during event bubbling.<tr><td><a id="l87"></a><a href="#l87">87</a><td> *<tr><td><a id="l88"></a><a href="#l88">88</a><td> * TODO(chrishenry): Change this to goog.events.Listenable. This<tr><td><a id="l89"></a><a href="#l89">89</a><td> * currently breaks people who expect getParentEventTarget to return<tr><td><a id="l90"></a><a href="#l90">90</a><td> * goog.events.EventTarget.<tr><td><a id="l91"></a><a href="#l91">91</a><td> *<tr><td><a id="l92"></a><a href="#l92">92</a><td> * @private {goog.events.EventTarget}<tr><td><a id="l93"></a><a href="#l93">93</a><td> */<tr><td><a id="l94"></a><a href="#l94">94</a><td> this.parentEventTarget_ = null;<tr><td><a id="l95"></a><a href="#l95">95</a><td>};<tr><td><a id="l96"></a><a href="#l96">96</a><td>goog.inherits(goog.events.EventTarget, goog.Disposable);<tr><td><a id="l97"></a><a href="#l97">97</a><td>goog.events.Listenable.addImplementation(goog.events.EventTarget);<tr><td><a id="l98"></a><a href="#l98">98</a><td><tr><td><a id="l99"></a><a href="#l99">99</a><td><tr><td><a id="l100"></a><a href="#l100">100</a><td>/**<tr><td><a id="l101"></a><a href="#l101">101</a><td> * An artificial cap on the number of ancestors you can have. This is mainly<tr><td><a id="l102"></a><a href="#l102">102</a><td> * for loop detection.<tr><td><a id="l103"></a><a href="#l103">103</a><td> * @const {number}<tr><td><a id="l104"></a><a href="#l104">104</a><td> * @private<tr><td><a id="l105"></a><a href="#l105">105</a><td> */<tr><td><a id="l106"></a><a href="#l106">106</a><td>goog.events.EventTarget.MAX_ANCESTORS_ = 1000;<tr><td><a id="l107"></a><a href="#l107">107</a><td><tr><td><a id="l108"></a><a href="#l108">108</a><td><tr><td><a id="l109"></a><a href="#l109">109</a><td>/**<tr><td><a id="l110"></a><a href="#l110">110</a><td> * Returns the parent of this event target to use for bubbling.<tr><td><a id="l111"></a><a href="#l111">111</a><td> *<tr><td><a id="l112"></a><a href="#l112">112</a><td> * @return {goog.events.EventTarget} The parent EventTarget or null if<tr><td><a id="l113"></a><a href="#l113">113</a><td> * there is no parent.<tr><td><a id="l114"></a><a href="#l114">114</a><td> * @override<tr><td><a id="l115"></a><a href="#l115">115</a><td> */<tr><td><a id="l116"></a><a href="#l116">116</a><td>goog.events.EventTarget.prototype.getParentEventTarget = function() {<tr><td><a id="l117"></a><a href="#l117">117</a><td> return this.parentEventTarget_;<tr><td><a id="l118"></a><a href="#l118">118</a><td>};<tr><td><a id="l119"></a><a href="#l119">119</a><td><tr><td><a id="l120"></a><a href="#l120">120</a><td><tr><td><a id="l121"></a><a href="#l121">121</a><td>/**<tr><td><a id="l122"></a><a href="#l122">122</a><td> * Sets the parent of this event target to use for capture/bubble<tr><td><a id="l123"></a><a href="#l123">123</a><td> * mechanism.<tr><td><a id="l124"></a><a href="#l124">124</a><td> * @param {goog.events.EventTarget} parent Parent listenable (null if none).<tr><td><a id="l125"></a><a href="#l125">125</a><td> */<tr><td><a id="l126"></a><a href="#l126">126</a><td>goog.events.EventTarget.prototype.setParentEventTarget = function(parent) {<tr><td><a id="l127"></a><a href="#l127">127</a><td> this.parentEventTarget_ = parent;<tr><td><a id="l128"></a><a href="#l128">128</a><td>};<tr><td><a id="l129"></a><a href="#l129">129</a><td><tr><td><a id="l130"></a><a href="#l130">130</a><td><tr><td><a id="l131"></a><a href="#l131">131</a><td>/**<tr><td><a id="l132"></a><a href="#l132">132</a><td> * Adds an event listener to the event target. The same handler can only be<tr><td><a id="l133"></a><a href="#l133">133</a><td> * added once per the type. Even if you add the same handler multiple times<tr><td><a id="l134"></a><a href="#l134">134</a><td> * using the same type then it will only be called once when the event is<tr><td><a id="l135"></a><a href="#l135">135</a><td> * dispatched.<tr><td><a id="l136"></a><a href="#l136">136</a><td> *<tr><td><a id="l137"></a><a href="#l137">137</a><td> * @param {string} type The type of the event to listen for.<tr><td><a id="l138"></a><a href="#l138">138</a><td> * @param {function(?):?|{handleEvent:function(?):?}|null} handler The function<tr><td><a id="l139"></a><a href="#l139">139</a><td> * to handle the event. The handler can also be an object that implements<tr><td><a id="l140"></a><a href="#l140">140</a><td> * the handleEvent method which takes the event object as argument.<tr><td><a id="l141"></a><a href="#l141">141</a><td> * @param {boolean=} opt_capture In DOM-compliant browsers, this determines<tr><td><a id="l142"></a><a href="#l142">142</a><td> * whether the listener is fired during the capture or bubble phase<tr><td><a id="l143"></a><a href="#l143">143</a><td> * of the event.<tr><td><a id="l144"></a><a href="#l144">144</a><td> * @param {Object=} opt_handlerScope Object in whose scope to call<tr><td><a id="l145"></a><a href="#l145">145</a><td> * the listener.<tr><td><a id="l146"></a><a href="#l146">146</a><td> * @deprecated Use {@code #listen} instead, when possible. Otherwise, use<tr><td><a id="l147"></a><a href="#l147">147</a><td> * {@code goog.events.listen} if you are passing Object<tr><td><a id="l148"></a><a href="#l148">148</a><td> * (instead of Function) as handler.<tr><td><a id="l149"></a><a href="#l149">149</a><td> */<tr><td><a id="l150"></a><a href="#l150">150</a><td>goog.events.EventTarget.prototype.addEventListener = function(<tr><td><a id="l151"></a><a href="#l151">151</a><td> type, handler, opt_capture, opt_handlerScope) {<tr><td><a id="l152"></a><a href="#l152">152</a><td> goog.events.listen(this, type, handler, opt_capture, opt_handlerScope);<tr><td><a id="l153"></a><a href="#l153">153</a><td>};<tr><td><a id="l154"></a><a href="#l154">154</a><td><tr><td><a id="l155"></a><a href="#l155">155</a><td><tr><td><a id="l156"></a><a href="#l156">156</a><td>/**<tr><td><a id="l157"></a><a href="#l157">157</a><td> * Removes an event listener from the event target. The handler must be the<tr><td><a id="l158"></a><a href="#l158">158</a><td> * same object as the one added. If the handler has not been added then<tr><td><a id="l159"></a><a href="#l159">159</a><td> * nothing is done.<tr><td><a id="l160"></a><a href="#l160">160</a><td> *<tr><td><a id="l161"></a><a href="#l161">161</a><td> * @param {string} type The type of the event to listen for.<tr><td><a id="l162"></a><a href="#l162">162</a><td> * @param {function(?):?|{handleEvent:function(?):?}|null} handler The function<tr><td><a id="l163"></a><a href="#l163">163</a><td> * to handle the event. The handler can also be an object that implements<tr><td><a id="l164"></a><a href="#l164">164</a><td> * the handleEvent method which takes the event object as argument.<tr><td><a id="l165"></a><a href="#l165">165</a><td> * @param {boolean=} opt_capture In DOM-compliant browsers, this determines<tr><td><a id="l166"></a><a href="#l166">166</a><td> * whether the listener is fired during the capture or bubble phase<tr><td><a id="l167"></a><a href="#l167">167</a><td> * of the event.<tr><td><a id="l168"></a><a href="#l168">168</a><td> * @param {Object=} opt_handlerScope Object in whose scope to call<tr><td><a id="l169"></a><a href="#l169">169</a><td> * the listener.<tr><td><a id="l170"></a><a href="#l170">170</a><td> * @deprecated Use {@code #unlisten} instead, when possible. Otherwise, use<tr><td><a id="l171"></a><a href="#l171">171</a><td> * {@code goog.events.unlisten} if you are passing Object<tr><td><a id="l172"></a><a href="#l172">172</a><td> * (instead of Function) as handler.<tr><td><a id="l173"></a><a href="#l173">173</a><td> */<tr><td><a id="l174"></a><a href="#l174">174</a><td>goog.events.EventTarget.prototype.removeEventListener = function(<tr><td><a id="l175"></a><a href="#l175">175</a><td> type, handler, opt_capture, opt_handlerScope) {<tr><td><a id="l176"></a><a href="#l176">176</a><td> goog.events.unlisten(this, type, handler, opt_capture, opt_handlerScope);<tr><td><a id="l177"></a><a href="#l177">177</a><td>};<tr><td><a id="l178"></a><a href="#l178">178</a><td><tr><td><a id="l179"></a><a href="#l179">179</a><td><tr><td><a id="l180"></a><a href="#l180">180</a><td>/** @override */<tr><td><a id="l181"></a><a href="#l181">181</a><td>goog.events.EventTarget.prototype.dispatchEvent = function(e) {<tr><td><a id="l182"></a><a href="#l182">182</a><td> this.assertInitialized_();<tr><td><a id="l183"></a><a href="#l183">183</a><td><tr><td><a id="l184"></a><a href="#l184">184</a><td> var ancestorsTree, ancestor = this.getParentEventTarget();<tr><td><a id="l185"></a><a href="#l185">185</a><td> if (ancestor) {<tr><td><a id="l186"></a><a href="#l186">186</a><td> ancestorsTree = [];<tr><td><a id="l187"></a><a href="#l187">187</a><td> var ancestorCount = 1;<tr><td><a id="l188"></a><a href="#l188">188</a><td> for (; ancestor; ancestor = ancestor.getParentEventTarget()) {<tr><td><a id="l189"></a><a href="#l189">189</a><td> ancestorsTree.push(ancestor);<tr><td><a id="l190"></a><a href="#l190">190</a><td> goog.asserts.assert(<tr><td><a id="l191"></a><a href="#l191">191</a><td> (++ancestorCount < goog.events.EventTarget.MAX_ANCESTORS_),<tr><td><a id="l192"></a><a href="#l192">192</a><td> 'infinite loop');<tr><td><a id="l193"></a><a href="#l193">193</a><td> }<tr><td><a id="l194"></a><a href="#l194">194</a><td> }<tr><td><a id="l195"></a><a href="#l195">195</a><td><tr><td><a id="l196"></a><a href="#l196">196</a><td> return goog.events.EventTarget.dispatchEventInternal_(<tr><td><a id="l197"></a><a href="#l197">197</a><td> this.actualEventTarget_, e, ancestorsTree);<tr><td><a id="l198"></a><a href="#l198">198</a><td>};<tr><td><a id="l199"></a><a href="#l199">199</a><td><tr><td><a id="l200"></a><a href="#l200">200</a><td><tr><td><a id="l201"></a><a href="#l201">201</a><td>/**<tr><td><a id="l202"></a><a href="#l202">202</a><td> * Removes listeners from this object. Classes that extend EventTarget may<tr><td><a id="l203"></a><a href="#l203">203</a><td> * need to override this method in order to remove references to DOM Elements<tr><td><a id="l204"></a><a href="#l204">204</a><td> * and additional listeners.<tr><td><a id="l205"></a><a href="#l205">205</a><td> * @override<tr><td><a id="l206"></a><a href="#l206">206</a><td> */<tr><td><a id="l207"></a><a href="#l207">207</a><td>goog.events.EventTarget.prototype.disposeInternal = function() {<tr><td><a id="l208"></a><a href="#l208">208</a><td> goog.events.EventTarget.superClass_.disposeInternal.call(this);<tr><td><a id="l209"></a><a href="#l209">209</a><td><tr><td><a id="l210"></a><a href="#l210">210</a><td> this.removeAllListeners();<tr><td><a id="l211"></a><a href="#l211">211</a><td> this.parentEventTarget_ = null;<tr><td><a id="l212"></a><a href="#l212">212</a><td>};<tr><td><a id="l213"></a><a href="#l213">213</a><td><tr><td><a id="l214"></a><a href="#l214">214</a><td><tr><td><a id="l215"></a><a href="#l215">215</a><td>/** @override */<tr><td><a id="l216"></a><a href="#l216">216</a><td>goog.events.EventTarget.prototype.listen = function(<tr><td><a id="l217"></a><a href="#l217">217</a><td> type, listener, opt_useCapture, opt_listenerScope) {<tr><td><a id="l218"></a><a href="#l218">218</a><td> this.assertInitialized_();<tr><td><a id="l219"></a><a href="#l219">219</a><td> return this.eventTargetListeners_.add(<tr><td><a id="l220"></a><a href="#l220">220</a><td> String(type), listener, false /* callOnce */, opt_useCapture,<tr><td><a id="l221"></a><a href="#l221">221</a><td> opt_listenerScope);<tr><td><a id="l222"></a><a href="#l222">222</a><td>};<tr><td><a id="l223"></a><a href="#l223">223</a><td><tr><td><a id="l224"></a><a href="#l224">224</a><td><tr><td><a id="l225"></a><a href="#l225">225</a><td>/** @override */<tr><td><a id="l226"></a><a href="#l226">226</a><td>goog.events.EventTarget.prototype.listenOnce = function(<tr><td><a id="l227"></a><a href="#l227">227</a><td> type, listener, opt_useCapture, opt_listenerScope) {<tr><td><a id="l228"></a><a href="#l228">228</a><td> return this.eventTargetListeners_.add(<tr><td><a id="l229"></a><a href="#l229">229</a><td> String(type), listener, true /* callOnce */, opt_useCapture,<tr><td><a id="l230"></a><a href="#l230">230</a><td> opt_listenerScope);<tr><td><a id="l231"></a><a href="#l231">231</a><td>};<tr><td><a id="l232"></a><a href="#l232">232</a><td><tr><td><a id="l233"></a><a href="#l233">233</a><td><tr><td><a id="l234"></a><a href="#l234">234</a><td>/** @override */<tr><td><a id="l235"></a><a href="#l235">235</a><td>goog.events.EventTarget.prototype.unlisten = function(<tr><td><a id="l236"></a><a href="#l236">236</a><td> type, listener, opt_useCapture, opt_listenerScope) {<tr><td><a id="l237"></a><a href="#l237">237</a><td> return this.eventTargetListeners_.remove(<tr><td><a id="l238"></a><a href="#l238">238</a><td> String(type), listener, opt_useCapture, opt_listenerScope);<tr><td><a id="l239"></a><a href="#l239">239</a><td>};<tr><td><a id="l240"></a><a href="#l240">240</a><td><tr><td><a id="l241"></a><a href="#l241">241</a><td><tr><td><a id="l242"></a><a href="#l242">242</a><td>/** @override */<tr><td><a id="l243"></a><a href="#l243">243</a><td>goog.events.EventTarget.prototype.unlistenByKey = function(key) {<tr><td><a id="l244"></a><a href="#l244">244</a><td> return this.eventTargetListeners_.removeByKey(key);<tr><td><a id="l245"></a><a href="#l245">245</a><td>};<tr><td><a id="l246"></a><a href="#l246">246</a><td><tr><td><a id="l247"></a><a href="#l247">247</a><td><tr><td><a id="l248"></a><a href="#l248">248</a><td>/** @override */<tr><td><a id="l249"></a><a href="#l249">249</a><td>goog.events.EventTarget.prototype.removeAllListeners = function(opt_type) {<tr><td><a id="l250"></a><a href="#l250">250</a><td> // TODO(chrishenry): Previously, removeAllListeners can be called on<tr><td><a id="l251"></a><a href="#l251">251</a><td> // uninitialized EventTarget, so we preserve that behavior. We<tr><td><a id="l252"></a><a href="#l252">252</a><td> // should remove this when usages that rely on that fact are purged.<tr><td><a id="l253"></a><a href="#l253">253</a><td> if (!this.eventTargetListeners_) {<tr><td><a id="l254"></a><a href="#l254">254</a><td> return 0;<tr><td><a id="l255"></a><a href="#l255">255</a><td> }<tr><td><a id="l256"></a><a href="#l256">256</a><td> return this.eventTargetListeners_.removeAll(opt_type);<tr><td><a id="l257"></a><a href="#l257">257</a><td>};<tr><td><a id="l258"></a><a href="#l258">258</a><td><tr><td><a id="l259"></a><a href="#l259">259</a><td><tr><td><a id="l260"></a><a href="#l260">260</a><td>/** @override */<tr><td><a id="l261"></a><a href="#l261">261</a><td>goog.events.EventTarget.prototype.fireListeners = function(<tr><td><a id="l262"></a><a href="#l262">262</a><td> type, capture, eventObject) {<tr><td><a id="l263"></a><a href="#l263">263</a><td> // TODO(chrishenry): Original code avoids array creation when there<tr><td><a id="l264"></a><a href="#l264">264</a><td> // is no listener, so we do the same. If this optimization turns<tr><td><a id="l265"></a><a href="#l265">265</a><td> // out to be not required, we can replace this with<tr><td><a id="l266"></a><a href="#l266">266</a><td> // getListeners(type, capture) instead, which is simpler.<tr><td><a id="l267"></a><a href="#l267">267</a><td> var listenerArray = this.eventTargetListeners_.listeners[String(type)];<tr><td><a id="l268"></a><a href="#l268">268</a><td> if (!listenerArray) {<tr><td><a id="l269"></a><a href="#l269">269</a><td> return true;<tr><td><a id="l270"></a><a href="#l270">270</a><td> }<tr><td><a id="l271"></a><a href="#l271">271</a><td> listenerArray = listenerArray.concat();<tr><td><a id="l272"></a><a href="#l272">272</a><td><tr><td><a id="l273"></a><a href="#l273">273</a><td> var rv = true;<tr><td><a id="l274"></a><a href="#l274">274</a><td> for (var i = 0; i < listenerArray.length; ++i) {<tr><td><a id="l275"></a><a href="#l275">275</a><td> var listener = listenerArray[i];<tr><td><a id="l276"></a><a href="#l276">276</a><td> // We might not have a listener if the listener was removed.<tr><td><a id="l277"></a><a href="#l277">277</a><td> if (listener && !listener.removed && listener.capture == capture) {<tr><td><a id="l278"></a><a href="#l278">278</a><td> var listenerFn = listener.listener;<tr><td><a id="l279"></a><a href="#l279">279</a><td> var listenerHandler = listener.handler || listener.src;<tr><td><a id="l280"></a><a href="#l280">280</a><td><tr><td><a id="l281"></a><a href="#l281">281</a><td> if (listener.callOnce) {<tr><td><a id="l282"></a><a href="#l282">282</a><td> this.unlistenByKey(listener);<tr><td><a id="l283"></a><a href="#l283">283</a><td> }<tr><td><a id="l284"></a><a href="#l284">284</a><td> rv = listenerFn.call(listenerHandler, eventObject) !== false && rv;<tr><td><a id="l285"></a><a href="#l285">285</a><td> }<tr><td><a id="l286"></a><a href="#l286">286</a><td> }<tr><td><a id="l287"></a><a href="#l287">287</a><td><tr><td><a id="l288"></a><a href="#l288">288</a><td> return rv && eventObject.returnValue_ != false;<tr><td><a id="l289"></a><a href="#l289">289</a><td>};<tr><td><a id="l290"></a><a href="#l290">290</a><td><tr><td><a id="l291"></a><a href="#l291">291</a><td><tr><td><a id="l292"></a><a href="#l292">292</a><td>/** @override */<tr><td><a id="l293"></a><a href="#l293">293</a><td>goog.events.EventTarget.prototype.getListeners = function(type, capture) {<tr><td><a id="l294"></a><a href="#l294">294</a><td> return this.eventTargetListeners_.getListeners(String(type), capture);<tr><td><a id="l295"></a><a href="#l295">295</a><td>};<tr><td><a id="l296"></a><a href="#l296">296</a><td><tr><td><a id="l297"></a><a href="#l297">297</a><td><tr><td><a id="l298"></a><a href="#l298">298</a><td>/** @override */<tr><td><a id="l299"></a><a href="#l299">299</a><td>goog.events.EventTarget.prototype.getListener = function(<tr><td><a id="l300"></a><a href="#l300">300</a><td> type, listener, capture, opt_listenerScope) {<tr><td><a id="l301"></a><a href="#l301">301</a><td> return this.eventTargetListeners_.getListener(<tr><td><a id="l302"></a><a href="#l302">302</a><td> String(type), listener, capture, opt_listenerScope);<tr><td><a id="l303"></a><a href="#l303">303</a><td>};<tr><td><a id="l304"></a><a href="#l304">304</a><td><tr><td><a id="l305"></a><a href="#l305">305</a><td><tr><td><a id="l306"></a><a href="#l306">306</a><td>/** @override */<tr><td><a id="l307"></a><a href="#l307">307</a><td>goog.events.EventTarget.prototype.hasListener = function(<tr><td><a id="l308"></a><a href="#l308">308</a><td> opt_type, opt_capture) {<tr><td><a id="l309"></a><a href="#l309">309</a><td> var id = goog.isDef(opt_type) ? String(opt_type) : undefined;<tr><td><a id="l310"></a><a href="#l310">310</a><td> return this.eventTargetListeners_.hasListener(id, opt_capture);<tr><td><a id="l311"></a><a href="#l311">311</a><td>};<tr><td><a id="l312"></a><a href="#l312">312</a><td><tr><td><a id="l313"></a><a href="#l313">313</a><td><tr><td><a id="l314"></a><a href="#l314">314</a><td>/**<tr><td><a id="l315"></a><a href="#l315">315</a><td> * Sets the target to be used for {@code event.target} when firing<tr><td><a id="l316"></a><a href="#l316">316</a><td> * event. Mainly used for testing. For example, see<tr><td><a id="l317"></a><a href="#l317">317</a><td> * {@code goog.testing.events.mixinListenable}.<tr><td><a id="l318"></a><a href="#l318">318</a><td> * @param {!Object} target The target.<tr><td><a id="l319"></a><a href="#l319">319</a><td> */<tr><td><a id="l320"></a><a href="#l320">320</a><td>goog.events.EventTarget.prototype.setTargetForTesting = function(target) {<tr><td><a id="l321"></a><a href="#l321">321</a><td> this.actualEventTarget_ = target;<tr><td><a id="l322"></a><a href="#l322">322</a><td>};<tr><td><a id="l323"></a><a href="#l323">323</a><td><tr><td><a id="l324"></a><a href="#l324">324</a><td><tr><td><a id="l325"></a><a href="#l325">325</a><td>/**<tr><td><a id="l326"></a><a href="#l326">326</a><td> * Asserts that the event target instance is initialized properly.<tr><td><a id="l327"></a><a href="#l327">327</a><td> * @private<tr><td><a id="l328"></a><a href="#l328">328</a><td> */<tr><td><a id="l329"></a><a href="#l329">329</a><td>goog.events.EventTarget.prototype.assertInitialized_ = function() {<tr><td><a id="l330"></a><a href="#l330">330</a><td> goog.asserts.assert(<tr><td><a id="l331"></a><a href="#l331">331</a><td> this.eventTargetListeners_,<tr><td><a id="l332"></a><a href="#l332">332</a><td> 'Event target is not initialized. Did you call the superclass ' +<tr><td><a id="l333"></a><a href="#l333">333</a><td> '(goog.events.EventTarget) constructor?');<tr><td><a id="l334"></a><a href="#l334">334</a><td>};<tr><td><a id="l335"></a><a href="#l335">335</a><td><tr><td><a id="l336"></a><a href="#l336">336</a><td><tr><td><a id="l337"></a><a href="#l337">337</a><td>/**<tr><td><a id="l338"></a><a href="#l338">338</a><td> * Dispatches the given event on the ancestorsTree.<tr><td><a id="l339"></a><a href="#l339">339</a><td> *<tr><td><a id="l340"></a><a href="#l340">340</a><td> * @param {!Object} target The target to dispatch on.<tr><td><a id="l341"></a><a href="#l341">341</a><td> * @param {goog.events.Event|Object|string} e The event object.<tr><td><a id="l342"></a><a href="#l342">342</a><td> * @param {Array<goog.events.Listenable>=} opt_ancestorsTree The ancestors<tr><td><a id="l343"></a><a href="#l343">343</a><td> * tree of the target, in reverse order from the closest ancestor<tr><td><a id="l344"></a><a href="#l344">344</a><td> * to the root event target. May be null if the target has no ancestor.<tr><td><a id="l345"></a><a href="#l345">345</a><td> * @return {boolean} If anyone called preventDefault on the event object (or<tr><td><a id="l346"></a><a href="#l346">346</a><td> * if any of the listeners returns false) this will also return false.<tr><td><a id="l347"></a><a href="#l347">347</a><td> * @private<tr><td><a id="l348"></a><a href="#l348">348</a><td> */<tr><td><a id="l349"></a><a href="#l349">349</a><td>goog.events.EventTarget.dispatchEventInternal_ = function(<tr><td><a id="l350"></a><a href="#l350">350</a><td> target, e, opt_ancestorsTree) {<tr><td><a id="l351"></a><a href="#l351">351</a><td> var type = e.type || /** @type {string} */ (e);<tr><td><a id="l352"></a><a href="#l352">352</a><td><tr><td><a id="l353"></a><a href="#l353">353</a><td> // If accepting a string or object, create a custom event object so that<tr><td><a id="l354"></a><a href="#l354">354</a><td> // preventDefault and stopPropagation work with the event.<tr><td><a id="l355"></a><a href="#l355">355</a><td> if (goog.isString(e)) {<tr><td><a id="l356"></a><a href="#l356">356</a><td> e = new goog.events.Event(e, target);<tr><td><a id="l357"></a><a href="#l357">357</a><td> } else if (!(e instanceof goog.events.Event)) {<tr><td><a id="l358"></a><a href="#l358">358</a><td> var oldEvent = e;<tr><td><a id="l359"></a><a href="#l359">359</a><td> e = new goog.events.Event(type, target);<tr><td><a id="l360"></a><a href="#l360">360</a><td> goog.object.extend(e, oldEvent);<tr><td><a id="l361"></a><a href="#l361">361</a><td> } else {<tr><td><a id="l362"></a><a href="#l362">362</a><td> e.target = e.target || target;<tr><td><a id="l363"></a><a href="#l363">363</a><td> }<tr><td><a id="l364"></a><a href="#l364">364</a><td><tr><td><a id="l365"></a><a href="#l365">365</a><td> var rv = true, currentTarget;<tr><td><a id="l366"></a><a href="#l366">366</a><td><tr><td><a id="l367"></a><a href="#l367">367</a><td> // Executes all capture listeners on the ancestors, if any.<tr><td><a id="l368"></a><a href="#l368">368</a><td> if (opt_ancestorsTree) {<tr><td><a id="l369"></a><a href="#l369">369</a><td> for (var i = opt_ancestorsTree.length - 1; !e.propagationStopped_ && i >= 0;<tr><td><a id="l370"></a><a href="#l370">370</a><td> i--) {<tr><td><a id="l371"></a><a href="#l371">371</a><td> currentTarget = e.currentTarget = opt_ancestorsTree[i];<tr><td><a id="l372"></a><a href="#l372">372</a><td> rv = currentTarget.fireListeners(type, true, e) && rv;<tr><td><a id="l373"></a><a href="#l373">373</a><td> }<tr><td><a id="l374"></a><a href="#l374">374</a><td> }<tr><td><a id="l375"></a><a href="#l375">375</a><td><tr><td><a id="l376"></a><a href="#l376">376</a><td> // Executes capture and bubble listeners on the target.<tr><td><a id="l377"></a><a href="#l377">377</a><td> if (!e.propagationStopped_) {<tr><td><a id="l378"></a><a href="#l378">378</a><td> currentTarget = e.currentTarget = target;<tr><td><a id="l379"></a><a href="#l379">379</a><td> rv = currentTarget.fireListeners(type, true, e) && rv;<tr><td><a id="l380"></a><a href="#l380">380</a><td> if (!e.propagationStopped_) {<tr><td><a id="l381"></a><a href="#l381">381</a><td> rv = currentTarget.fireListeners(type, false, e) && rv;<tr><td><a id="l382"></a><a href="#l382">382</a><td> }<tr><td><a id="l383"></a><a href="#l383">383</a><td> }<tr><td><a id="l384"></a><a href="#l384">384</a><td><tr><td><a id="l385"></a><a href="#l385">385</a><td> // Executes all bubble listeners on the ancestors, if any.<tr><td><a id="l386"></a><a href="#l386">386</a><td> if (opt_ancestorsTree) {<tr><td><a id="l387"></a><a href="#l387">387</a><td> for (i = 0; !e.propagationStopped_ && i < opt_ancestorsTree.length; i++) {<tr><td><a id="l388"></a><a href="#l388">388</a><td> currentTarget = e.currentTarget = opt_ancestorsTree[i];<tr><td><a id="l389"></a><a href="#l389">389</a><td> rv = currentTarget.fireListeners(type, false, e) && rv;<tr><td><a id="l390"></a><a href="#l390">390</a><td> }<tr><td><a id="l391"></a><a href="#l391">391</a><td> }<tr><td><a id="l392"></a><a href="#l392">392</a><td><tr><td><a id="l393"></a><a href="#l393">393</a><td> return rv;<tr><td><a id="l394"></a><a href="#l394">394</a><td>};</table></div></article><nav><h3><a href="../../../../index.html">Overview</a></h3><div><input type="checkbox" id="nav-modules" checked/><label for="nav-modules"><h3>Modules</h3></label><div><ul><li><a href="../../../../module_selenium-webdriver.html">selenium-webdriver</a><li><a href="../../../../module_selenium-webdriver__base.html">selenium-webdriver/_base</a><li><a href="../../../../module_selenium-webdriver_builder.html">selenium-webdriver/builder</a><li><a href="../../../../module_selenium-webdriver_chrome.html">selenium-webdriver/chrome</a><li><a href="../../../../module_selenium-webdriver_error.html">selenium-webdriver/error</a><li><a href="../../../../module_selenium-webdriver_executors.html">selenium-webdriver/executors</a><li><a 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