selenium-webdriver
Version:
The official WebDriver JavaScript bindings from the Selenium project
1 lines • 93 kB
HTML
<!DOCTYPE html><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>events.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/events.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 An event manager for both native browser event<tr><td><a id="l17"></a><a href="#l17">17</a><td> * targets and custom JavaScript event targets<tr><td><a id="l18"></a><a href="#l18">18</a><td> * ({@code goog.events.Listenable}). This provides an abstraction<tr><td><a id="l19"></a><a href="#l19">19</a><td> * over browsers' event systems.<tr><td><a id="l20"></a><a href="#l20">20</a><td> *<tr><td><a id="l21"></a><a href="#l21">21</a><td> * It also provides a simulation of W3C event model's capture phase in<tr><td><a id="l22"></a><a href="#l22">22</a><td> * Internet Explorer (IE 8 and below). Caveat: the simulation does not<tr><td><a id="l23"></a><a href="#l23">23</a><td> * interact well with listeners registered directly on the elements<tr><td><a id="l24"></a><a href="#l24">24</a><td> * (bypassing goog.events) or even with listeners registered via<tr><td><a id="l25"></a><a href="#l25">25</a><td> * goog.events in a separate JS binary. In these cases, we provide<tr><td><a id="l26"></a><a href="#l26">26</a><td> * no ordering guarantees.<tr><td><a id="l27"></a><a href="#l27">27</a><td> *<tr><td><a id="l28"></a><a href="#l28">28</a><td> * The listeners will receive a "patched" event object. Such event object<tr><td><a id="l29"></a><a href="#l29">29</a><td> * contains normalized values for certain event properties that differs in<tr><td><a id="l30"></a><a href="#l30">30</a><td> * different browsers.<tr><td><a id="l31"></a><a href="#l31">31</a><td> *<tr><td><a id="l32"></a><a href="#l32">32</a><td> * Example usage:<tr><td><a id="l33"></a><a href="#l33">33</a><td> * <pre><tr><td><a id="l34"></a><a href="#l34">34</a><td> * goog.events.listen(myNode, 'click', function(e) { alert('woo') });<tr><td><a id="l35"></a><a href="#l35">35</a><td> * goog.events.listen(myNode, 'mouseover', mouseHandler, true);<tr><td><a id="l36"></a><a href="#l36">36</a><td> * goog.events.unlisten(myNode, 'mouseover', mouseHandler, true);<tr><td><a id="l37"></a><a href="#l37">37</a><td> * goog.events.removeAll(myNode);<tr><td><a id="l38"></a><a href="#l38">38</a><td> * </pre><tr><td><a id="l39"></a><a href="#l39">39</a><td> *<tr><td><a id="l40"></a><a href="#l40">40</a><td> * in IE and event object patching]<tr><td><a id="l41"></a><a href="#l41">41</a><td> * @author arv@google.com (Erik Arvidsson)<tr><td><a id="l42"></a><a href="#l42">42</a><td> *<tr><td><a id="l43"></a><a href="#l43">43</a><td> * @see ../demos/events.html<tr><td><a id="l44"></a><a href="#l44">44</a><td> * @see ../demos/event-propagation.html<tr><td><a id="l45"></a><a href="#l45">45</a><td> * @see ../demos/stopevent.html<tr><td><a id="l46"></a><a href="#l46">46</a><td> */<tr><td><a id="l47"></a><a href="#l47">47</a><td><tr><td><a id="l48"></a><a href="#l48">48</a><td>// IMPLEMENTATION NOTES:<tr><td><a id="l49"></a><a href="#l49">49</a><td>// goog.events stores an auxiliary data structure on each EventTarget<tr><td><a id="l50"></a><a href="#l50">50</a><td>// source being listened on. This allows us to take advantage of GC,<tr><td><a id="l51"></a><a href="#l51">51</a><td>// having the data structure GC'd when the EventTarget is GC'd. This<tr><td><a id="l52"></a><a href="#l52">52</a><td>// GC behavior is equivalent to using W3C DOM Events directly.<tr><td><a id="l53"></a><a href="#l53">53</a><td><tr><td><a id="l54"></a><a href="#l54">54</a><td>goog.provide('goog.events');<tr><td><a id="l55"></a><a href="#l55">55</a><td>goog.provide('goog.events.CaptureSimulationMode');<tr><td><a id="l56"></a><a href="#l56">56</a><td>goog.provide('goog.events.Key');<tr><td><a id="l57"></a><a href="#l57">57</a><td>goog.provide('goog.events.ListenableType');<tr><td><a id="l58"></a><a href="#l58">58</a><td><tr><td><a id="l59"></a><a href="#l59">59</a><td>goog.require('goog.asserts');<tr><td><a id="l60"></a><a href="#l60">60</a><td>goog.require('goog.debug.entryPointRegistry');<tr><td><a id="l61"></a><a href="#l61">61</a><td>goog.require('goog.events.BrowserEvent');<tr><td><a id="l62"></a><a href="#l62">62</a><td>goog.require('goog.events.BrowserFeature');<tr><td><a id="l63"></a><a href="#l63">63</a><td>goog.require('goog.events.Listenable');<tr><td><a id="l64"></a><a href="#l64">64</a><td>goog.require('goog.events.ListenerMap');<tr><td><a id="l65"></a><a href="#l65">65</a><td><tr><td><a id="l66"></a><a href="#l66">66</a><td>goog.forwardDeclare('goog.debug.ErrorHandler');<tr><td><a id="l67"></a><a href="#l67">67</a><td>goog.forwardDeclare('goog.events.EventWrapper');<tr><td><a id="l68"></a><a href="#l68">68</a><td><tr><td><a id="l69"></a><a href="#l69">69</a><td><tr><td><a id="l70"></a><a href="#l70">70</a><td>/**<tr><td><a id="l71"></a><a href="#l71">71</a><td> * @typedef {number|goog.events.ListenableKey}<tr><td><a id="l72"></a><a href="#l72">72</a><td> */<tr><td><a id="l73"></a><a href="#l73">73</a><td>goog.events.Key;<tr><td><a id="l74"></a><a href="#l74">74</a><td><tr><td><a id="l75"></a><a href="#l75">75</a><td><tr><td><a id="l76"></a><a href="#l76">76</a><td>/**<tr><td><a id="l77"></a><a href="#l77">77</a><td> * @typedef {EventTarget|goog.events.Listenable}<tr><td><a id="l78"></a><a href="#l78">78</a><td> */<tr><td><a id="l79"></a><a href="#l79">79</a><td>goog.events.ListenableType;<tr><td><a id="l80"></a><a href="#l80">80</a><td><tr><td><a id="l81"></a><a href="#l81">81</a><td><tr><td><a id="l82"></a><a href="#l82">82</a><td>/**<tr><td><a id="l83"></a><a href="#l83">83</a><td> * Property name on a native event target for the listener map<tr><td><a id="l84"></a><a href="#l84">84</a><td> * associated with the event target.<tr><td><a id="l85"></a><a href="#l85">85</a><td> * @private @const {string}<tr><td><a id="l86"></a><a href="#l86">86</a><td> */<tr><td><a id="l87"></a><a href="#l87">87</a><td>goog.events.LISTENER_MAP_PROP_ = 'closure_lm_' + ((Math.random() * 1e6) | 0);<tr><td><a id="l88"></a><a href="#l88">88</a><td><tr><td><a id="l89"></a><a href="#l89">89</a><td><tr><td><a id="l90"></a><a href="#l90">90</a><td>/**<tr><td><a id="l91"></a><a href="#l91">91</a><td> * String used to prepend to IE event types.<tr><td><a id="l92"></a><a href="#l92">92</a><td> * @const<tr><td><a id="l93"></a><a href="#l93">93</a><td> * @private<tr><td><a id="l94"></a><a href="#l94">94</a><td> */<tr><td><a id="l95"></a><a href="#l95">95</a><td>goog.events.onString_ = 'on';<tr><td><a id="l96"></a><a href="#l96">96</a><td><tr><td><a id="l97"></a><a href="#l97">97</a><td><tr><td><a id="l98"></a><a href="#l98">98</a><td>/**<tr><td><a id="l99"></a><a href="#l99">99</a><td> * Map of computed "on<eventname>" strings for IE event types. Caching<tr><td><a id="l100"></a><a href="#l100">100</a><td> * this removes an extra object allocation in goog.events.listen which<tr><td><a id="l101"></a><a href="#l101">101</a><td> * improves IE6 performance.<tr><td><a id="l102"></a><a href="#l102">102</a><td> * @const<tr><td><a id="l103"></a><a href="#l103">103</a><td> * @dict<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.onStringMap_ = {};<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> * @enum {number} Different capture simulation mode for IE8-.<tr><td><a id="l111"></a><a href="#l111">111</a><td> */<tr><td><a id="l112"></a><a href="#l112">112</a><td>goog.events.CaptureSimulationMode = {<tr><td><a id="l113"></a><a href="#l113">113</a><td> /**<tr><td><a id="l114"></a><a href="#l114">114</a><td> * Does not perform capture simulation. Will asserts in IE8- when you<tr><td><a id="l115"></a><a href="#l115">115</a><td> * add capture listeners.<tr><td><a id="l116"></a><a href="#l116">116</a><td> */<tr><td><a id="l117"></a><a href="#l117">117</a><td> OFF_AND_FAIL: 0,<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> * Does not perform capture simulation, silently ignore capture<tr><td><a id="l121"></a><a href="#l121">121</a><td> * listeners.<tr><td><a id="l122"></a><a href="#l122">122</a><td> */<tr><td><a id="l123"></a><a href="#l123">123</a><td> OFF_AND_SILENT: 1,<tr><td><a id="l124"></a><a href="#l124">124</a><td><tr><td><a id="l125"></a><a href="#l125">125</a><td> /**<tr><td><a id="l126"></a><a href="#l126">126</a><td> * Performs capture simulation.<tr><td><a id="l127"></a><a href="#l127">127</a><td> */<tr><td><a id="l128"></a><a href="#l128">128</a><td> ON: 2<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>/**<tr><td><a id="l133"></a><a href="#l133">133</a><td> * @define {number} The capture simulation mode for IE8-. By default,<tr><td><a id="l134"></a><a href="#l134">134</a><td> * this is ON.<tr><td><a id="l135"></a><a href="#l135">135</a><td> */<tr><td><a id="l136"></a><a href="#l136">136</a><td>goog.define('goog.events.CAPTURE_SIMULATION_MODE', 2);<tr><td><a id="l137"></a><a href="#l137">137</a><td><tr><td><a id="l138"></a><a href="#l138">138</a><td><tr><td><a id="l139"></a><a href="#l139">139</a><td>/**<tr><td><a id="l140"></a><a href="#l140">140</a><td> * Estimated count of total native listeners.<tr><td><a id="l141"></a><a href="#l141">141</a><td> * @private {number}<tr><td><a id="l142"></a><a href="#l142">142</a><td> */<tr><td><a id="l143"></a><a href="#l143">143</a><td>goog.events.listenerCountEstimate_ = 0;<tr><td><a id="l144"></a><a href="#l144">144</a><td><tr><td><a id="l145"></a><a href="#l145">145</a><td><tr><td><a id="l146"></a><a href="#l146">146</a><td>/**<tr><td><a id="l147"></a><a href="#l147">147</a><td> * Adds an event listener for a specific event on a native event<tr><td><a id="l148"></a><a href="#l148">148</a><td> * target (such as a DOM element) or an object that has implemented<tr><td><a id="l149"></a><a href="#l149">149</a><td> * {@link goog.events.Listenable}. A listener can only be added once<tr><td><a id="l150"></a><a href="#l150">150</a><td> * to an object and if it is added again the key for the listener is<tr><td><a id="l151"></a><a href="#l151">151</a><td> * returned. Note that if the existing listener is a one-off listener<tr><td><a id="l152"></a><a href="#l152">152</a><td> * (registered via listenOnce), it will no longer be a one-off<tr><td><a id="l153"></a><a href="#l153">153</a><td> * listener after a call to listen().<tr><td><a id="l154"></a><a href="#l154">154</a><td> *<tr><td><a id="l155"></a><a href="#l155">155</a><td> * @param {EventTarget|goog.events.Listenable} src The node to listen<tr><td><a id="l156"></a><a href="#l156">156</a><td> * to events on.<tr><td><a id="l157"></a><a href="#l157">157</a><td> * @param {string|Array<string>|<tr><td><a id="l158"></a><a href="#l158">158</a><td> * !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}<tr><td><a id="l159"></a><a href="#l159">159</a><td> * type Event type or array of event types.<tr><td><a id="l160"></a><a href="#l160">160</a><td> * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}<tr><td><a id="l161"></a><a href="#l161">161</a><td> * listener Callback method, or an object with a handleEvent function.<tr><td><a id="l162"></a><a href="#l162">162</a><td> * WARNING: passing an Object is now softly deprecated.<tr><td><a id="l163"></a><a href="#l163">163</a><td> * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to<tr><td><a id="l164"></a><a href="#l164">164</a><td> * false).<tr><td><a id="l165"></a><a href="#l165">165</a><td> * @param {T=} opt_handler Element in whose scope to call the listener.<tr><td><a id="l166"></a><a href="#l166">166</a><td> * @return {goog.events.Key} Unique key for the listener.<tr><td><a id="l167"></a><a href="#l167">167</a><td> * @template T,EVENTOBJ<tr><td><a id="l168"></a><a href="#l168">168</a><td> */<tr><td><a id="l169"></a><a href="#l169">169</a><td>goog.events.listen = function(src, type, listener, opt_capt, opt_handler) {<tr><td><a id="l170"></a><a href="#l170">170</a><td> if (goog.isArray(type)) {<tr><td><a id="l171"></a><a href="#l171">171</a><td> for (var i = 0; i < type.length; i++) {<tr><td><a id="l172"></a><a href="#l172">172</a><td> goog.events.listen(src, type[i], listener, opt_capt, opt_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> return null;<tr><td><a id="l175"></a><a href="#l175">175</a><td> }<tr><td><a id="l176"></a><a href="#l176">176</a><td><tr><td><a id="l177"></a><a href="#l177">177</a><td> listener = goog.events.wrapListener(listener);<tr><td><a id="l178"></a><a href="#l178">178</a><td> if (goog.events.Listenable.isImplementedBy(src)) {<tr><td><a id="l179"></a><a href="#l179">179</a><td> return src.listen(<tr><td><a id="l180"></a><a href="#l180">180</a><td> /** @type {string|!goog.events.EventId} */ (type),<tr><td><a id="l181"></a><a href="#l181">181</a><td> listener, opt_capt, opt_handler);<tr><td><a id="l182"></a><a href="#l182">182</a><td> } else {<tr><td><a id="l183"></a><a href="#l183">183</a><td> return goog.events.listen_(<tr><td><a id="l184"></a><a href="#l184">184</a><td> /** @type {!EventTarget} */ (src),<tr><td><a id="l185"></a><a href="#l185">185</a><td> /** @type {string|!goog.events.EventId} */ (type),<tr><td><a id="l186"></a><a href="#l186">186</a><td> listener, /* callOnce */ false, opt_capt, opt_handler);<tr><td><a id="l187"></a><a href="#l187">187</a><td> }<tr><td><a id="l188"></a><a href="#l188">188</a><td>};<tr><td><a id="l189"></a><a href="#l189">189</a><td><tr><td><a id="l190"></a><a href="#l190">190</a><td><tr><td><a id="l191"></a><a href="#l191">191</a><td>/**<tr><td><a id="l192"></a><a href="#l192">192</a><td> * Adds an event listener for a specific event on a native event<tr><td><a id="l193"></a><a href="#l193">193</a><td> * target. A listener can only be added once to an object and if it<tr><td><a id="l194"></a><a href="#l194">194</a><td> * is added again the key for the listener is returned.<tr><td><a id="l195"></a><a href="#l195">195</a><td> *<tr><td><a id="l196"></a><a href="#l196">196</a><td> * Note that a one-off listener will not change an existing listener,<tr><td><a id="l197"></a><a href="#l197">197</a><td> * if any. On the other hand a normal listener will change existing<tr><td><a id="l198"></a><a href="#l198">198</a><td> * one-off listener to become a normal listener.<tr><td><a id="l199"></a><a href="#l199">199</a><td> *<tr><td><a id="l200"></a><a href="#l200">200</a><td> * @param {EventTarget} src The node to listen to events on.<tr><td><a id="l201"></a><a href="#l201">201</a><td> * @param {string|!goog.events.EventId} type Event type.<tr><td><a id="l202"></a><a href="#l202">202</a><td> * @param {!Function} listener Callback function.<tr><td><a id="l203"></a><a href="#l203">203</a><td> * @param {boolean} callOnce Whether the listener is a one-off<tr><td><a id="l204"></a><a href="#l204">204</a><td> * listener or otherwise.<tr><td><a id="l205"></a><a href="#l205">205</a><td> * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to<tr><td><a id="l206"></a><a href="#l206">206</a><td> * false).<tr><td><a id="l207"></a><a href="#l207">207</a><td> * @param {Object=} opt_handler Element in whose scope to call the listener.<tr><td><a id="l208"></a><a href="#l208">208</a><td> * @return {goog.events.ListenableKey} Unique key for the listener.<tr><td><a id="l209"></a><a href="#l209">209</a><td> * @private<tr><td><a id="l210"></a><a href="#l210">210</a><td> */<tr><td><a id="l211"></a><a href="#l211">211</a><td>goog.events.listen_ = function(<tr><td><a id="l212"></a><a href="#l212">212</a><td> src, type, listener, callOnce, opt_capt, opt_handler) {<tr><td><a id="l213"></a><a href="#l213">213</a><td> if (!type) {<tr><td><a id="l214"></a><a href="#l214">214</a><td> throw Error('Invalid event type');<tr><td><a id="l215"></a><a href="#l215">215</a><td> }<tr><td><a id="l216"></a><a href="#l216">216</a><td><tr><td><a id="l217"></a><a href="#l217">217</a><td> var capture = !!opt_capt;<tr><td><a id="l218"></a><a href="#l218">218</a><td> if (capture && !goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {<tr><td><a id="l219"></a><a href="#l219">219</a><td> if (goog.events.CAPTURE_SIMULATION_MODE ==<tr><td><a id="l220"></a><a href="#l220">220</a><td> goog.events.CaptureSimulationMode.OFF_AND_FAIL) {<tr><td><a id="l221"></a><a href="#l221">221</a><td> goog.asserts.fail('Can not register capture listener in IE8-.');<tr><td><a id="l222"></a><a href="#l222">222</a><td> return null;<tr><td><a id="l223"></a><a href="#l223">223</a><td> } else if (goog.events.CAPTURE_SIMULATION_MODE ==<tr><td><a id="l224"></a><a href="#l224">224</a><td> goog.events.CaptureSimulationMode.OFF_AND_SILENT) {<tr><td><a id="l225"></a><a href="#l225">225</a><td> return null;<tr><td><a id="l226"></a><a href="#l226">226</a><td> }<tr><td><a id="l227"></a><a href="#l227">227</a><td> }<tr><td><a id="l228"></a><a href="#l228">228</a><td><tr><td><a id="l229"></a><a href="#l229">229</a><td> var listenerMap = goog.events.getListenerMap_(src);<tr><td><a id="l230"></a><a href="#l230">230</a><td> if (!listenerMap) {<tr><td><a id="l231"></a><a href="#l231">231</a><td> src[goog.events.LISTENER_MAP_PROP_] = listenerMap =<tr><td><a id="l232"></a><a href="#l232">232</a><td> new goog.events.ListenerMap(src);<tr><td><a id="l233"></a><a href="#l233">233</a><td> }<tr><td><a id="l234"></a><a href="#l234">234</a><td><tr><td><a id="l235"></a><a href="#l235">235</a><td> var listenerObj = listenerMap.add(<tr><td><a id="l236"></a><a href="#l236">236</a><td> type, listener, callOnce, opt_capt, opt_handler);<tr><td><a id="l237"></a><a href="#l237">237</a><td><tr><td><a id="l238"></a><a href="#l238">238</a><td> // If the listenerObj already has a proxy, it has been set up<tr><td><a id="l239"></a><a href="#l239">239</a><td> // previously. We simply return.<tr><td><a id="l240"></a><a href="#l240">240</a><td> if (listenerObj.proxy) {<tr><td><a id="l241"></a><a href="#l241">241</a><td> return listenerObj;<tr><td><a id="l242"></a><a href="#l242">242</a><td> }<tr><td><a id="l243"></a><a href="#l243">243</a><td><tr><td><a id="l244"></a><a href="#l244">244</a><td> var proxy = goog.events.getProxy();<tr><td><a id="l245"></a><a href="#l245">245</a><td> listenerObj.proxy = proxy;<tr><td><a id="l246"></a><a href="#l246">246</a><td><tr><td><a id="l247"></a><a href="#l247">247</a><td> proxy.src = src;<tr><td><a id="l248"></a><a href="#l248">248</a><td> proxy.listener = listenerObj;<tr><td><a id="l249"></a><a href="#l249">249</a><td><tr><td><a id="l250"></a><a href="#l250">250</a><td> // Attach the proxy through the browser's API<tr><td><a id="l251"></a><a href="#l251">251</a><td> if (src.addEventListener) {<tr><td><a id="l252"></a><a href="#l252">252</a><td> src.addEventListener(type.toString(), proxy, capture);<tr><td><a id="l253"></a><a href="#l253">253</a><td> } else {<tr><td><a id="l254"></a><a href="#l254">254</a><td> // The else above used to be else if (src.attachEvent) and then there was<tr><td><a id="l255"></a><a href="#l255">255</a><td> // another else statement that threw an exception warning the developer<tr><td><a id="l256"></a><a href="#l256">256</a><td> // they made a mistake. This resulted in an extra object allocation in IE6<tr><td><a id="l257"></a><a href="#l257">257</a><td> // due to a wrapper object that had to be implemented around the element<tr><td><a id="l258"></a><a href="#l258">258</a><td> // and so was removed.<tr><td><a id="l259"></a><a href="#l259">259</a><td> src.attachEvent(goog.events.getOnString_(type.toString()), proxy);<tr><td><a id="l260"></a><a href="#l260">260</a><td> }<tr><td><a id="l261"></a><a href="#l261">261</a><td><tr><td><a id="l262"></a><a href="#l262">262</a><td> goog.events.listenerCountEstimate_++;<tr><td><a id="l263"></a><a href="#l263">263</a><td> return listenerObj;<tr><td><a id="l264"></a><a href="#l264">264</a><td>};<tr><td><a id="l265"></a><a href="#l265">265</a><td><tr><td><a id="l266"></a><a href="#l266">266</a><td><tr><td><a id="l267"></a><a href="#l267">267</a><td>/**<tr><td><a id="l268"></a><a href="#l268">268</a><td> * Helper function for returning a proxy function.<tr><td><a id="l269"></a><a href="#l269">269</a><td> * @return {!Function} A new or reused function object.<tr><td><a id="l270"></a><a href="#l270">270</a><td> */<tr><td><a id="l271"></a><a href="#l271">271</a><td>goog.events.getProxy = function() {<tr><td><a id="l272"></a><a href="#l272">272</a><td> var proxyCallbackFunction = goog.events.handleBrowserEvent_;<tr><td><a id="l273"></a><a href="#l273">273</a><td> // Use a local var f to prevent one allocation.<tr><td><a id="l274"></a><a href="#l274">274</a><td> var f = goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT ?<tr><td><a id="l275"></a><a href="#l275">275</a><td> function(eventObject) {<tr><td><a id="l276"></a><a href="#l276">276</a><td> return proxyCallbackFunction.call(f.src, f.listener, eventObject);<tr><td><a id="l277"></a><a href="#l277">277</a><td> } :<tr><td><a id="l278"></a><a href="#l278">278</a><td> function(eventObject) {<tr><td><a id="l279"></a><a href="#l279">279</a><td> var v = proxyCallbackFunction.call(f.src, f.listener, eventObject);<tr><td><a id="l280"></a><a href="#l280">280</a><td> // NOTE(chrishenry): In IE, we hack in a capture phase. However, if<tr><td><a id="l281"></a><a href="#l281">281</a><td> // there is inline event handler which tries to prevent default (for<tr><td><a id="l282"></a><a href="#l282">282</a><td> // example <a href="..." onclick="return false">...</a>) in a<tr><td><a id="l283"></a><a href="#l283">283</a><td> // descendant element, the prevent default will be overridden<tr><td><a id="l284"></a><a href="#l284">284</a><td> // by this listener if this listener were to return true. Hence, we<tr><td><a id="l285"></a><a href="#l285">285</a><td> // return undefined.<tr><td><a id="l286"></a><a href="#l286">286</a><td> if (!v) return v;<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 f;<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>/**<tr><td><a id="l293"></a><a href="#l293">293</a><td> * Adds an event listener for a specific event on a native event<tr><td><a id="l294"></a><a href="#l294">294</a><td> * target (such as a DOM element) or an object that has implemented<tr><td><a id="l295"></a><a href="#l295">295</a><td> * {@link goog.events.Listenable}. After the event has fired the event<tr><td><a id="l296"></a><a href="#l296">296</a><td> * listener is removed from the target.<tr><td><a id="l297"></a><a href="#l297">297</a><td> *<tr><td><a id="l298"></a><a href="#l298">298</a><td> * If an existing listener already exists, listenOnce will do<tr><td><a id="l299"></a><a href="#l299">299</a><td> * nothing. In particular, if the listener was previously registered<tr><td><a id="l300"></a><a href="#l300">300</a><td> * via listen(), listenOnce() will not turn the listener into a<tr><td><a id="l301"></a><a href="#l301">301</a><td> * one-off listener. Similarly, if there is already an existing<tr><td><a id="l302"></a><a href="#l302">302</a><td> * one-off listener, listenOnce does not modify the listeners (it is<tr><td><a id="l303"></a><a href="#l303">303</a><td> * still a once listener).<tr><td><a id="l304"></a><a href="#l304">304</a><td> *<tr><td><a id="l305"></a><a href="#l305">305</a><td> * @param {EventTarget|goog.events.Listenable} src The node to listen<tr><td><a id="l306"></a><a href="#l306">306</a><td> * to events on.<tr><td><a id="l307"></a><a href="#l307">307</a><td> * @param {string|Array<string>|<tr><td><a id="l308"></a><a href="#l308">308</a><td> * !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}<tr><td><a id="l309"></a><a href="#l309">309</a><td> * type Event type or array of event types.<tr><td><a id="l310"></a><a href="#l310">310</a><td> * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}<tr><td><a id="l311"></a><a href="#l311">311</a><td> * listener Callback method.<tr><td><a id="l312"></a><a href="#l312">312</a><td> * @param {boolean=} opt_capt Fire in capture phase?.<tr><td><a id="l313"></a><a href="#l313">313</a><td> * @param {T=} opt_handler Element in whose scope to call the listener.<tr><td><a id="l314"></a><a href="#l314">314</a><td> * @return {goog.events.Key} Unique key for the listener.<tr><td><a id="l315"></a><a href="#l315">315</a><td> * @template T,EVENTOBJ<tr><td><a id="l316"></a><a href="#l316">316</a><td> */<tr><td><a id="l317"></a><a href="#l317">317</a><td>goog.events.listenOnce = function(src, type, listener, opt_capt, opt_handler) {<tr><td><a id="l318"></a><a href="#l318">318</a><td> if (goog.isArray(type)) {<tr><td><a id="l319"></a><a href="#l319">319</a><td> for (var i = 0; i < type.length; i++) {<tr><td><a id="l320"></a><a href="#l320">320</a><td> goog.events.listenOnce(src, type[i], listener, opt_capt, opt_handler);<tr><td><a id="l321"></a><a href="#l321">321</a><td> }<tr><td><a id="l322"></a><a href="#l322">322</a><td> return null;<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> listener = goog.events.wrapListener(listener);<tr><td><a id="l326"></a><a href="#l326">326</a><td> if (goog.events.Listenable.isImplementedBy(src)) {<tr><td><a id="l327"></a><a href="#l327">327</a><td> return src.listenOnce(<tr><td><a id="l328"></a><a href="#l328">328</a><td> /** @type {string|!goog.events.EventId} */ (type),<tr><td><a id="l329"></a><a href="#l329">329</a><td> listener, opt_capt, opt_handler);<tr><td><a id="l330"></a><a href="#l330">330</a><td> } else {<tr><td><a id="l331"></a><a href="#l331">331</a><td> return goog.events.listen_(<tr><td><a id="l332"></a><a href="#l332">332</a><td> /** @type {!EventTarget} */ (src),<tr><td><a id="l333"></a><a href="#l333">333</a><td> /** @type {string|!goog.events.EventId} */ (type),<tr><td><a id="l334"></a><a href="#l334">334</a><td> listener, /* callOnce */ true, opt_capt, opt_handler);<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><tr><td><a id="l339"></a><a href="#l339">339</a><td>/**<tr><td><a id="l340"></a><a href="#l340">340</a><td> * Adds an event listener with a specific event wrapper on a DOM Node or an<tr><td><a id="l341"></a><a href="#l341">341</a><td> * object that has implemented {@link goog.events.Listenable}. A listener can<tr><td><a id="l342"></a><a href="#l342">342</a><td> * only be added once to an object.<tr><td><a id="l343"></a><a href="#l343">343</a><td> *<tr><td><a id="l344"></a><a href="#l344">344</a><td> * @param {EventTarget|goog.events.Listenable} src The target to<tr><td><a id="l345"></a><a href="#l345">345</a><td> * listen to events on.<tr><td><a id="l346"></a><a href="#l346">346</a><td> * @param {goog.events.EventWrapper} wrapper Event wrapper to use.<tr><td><a id="l347"></a><a href="#l347">347</a><td> * @param {function(this:T, ?):?|{handleEvent:function(?):?}|null} listener<tr><td><a id="l348"></a><a href="#l348">348</a><td> * Callback method, or an object with a handleEvent function.<tr><td><a id="l349"></a><a href="#l349">349</a><td> * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to<tr><td><a id="l350"></a><a href="#l350">350</a><td> * false).<tr><td><a id="l351"></a><a href="#l351">351</a><td> * @param {T=} opt_handler Element in whose scope to call the listener.<tr><td><a id="l352"></a><a href="#l352">352</a><td> * @template T<tr><td><a id="l353"></a><a href="#l353">353</a><td> */<tr><td><a id="l354"></a><a href="#l354">354</a><td>goog.events.listenWithWrapper = function(src, wrapper, listener, opt_capt,<tr><td><a id="l355"></a><a href="#l355">355</a><td> opt_handler) {<tr><td><a id="l356"></a><a href="#l356">356</a><td> wrapper.listen(src, listener, opt_capt, opt_handler);<tr><td><a id="l357"></a><a href="#l357">357</a><td>};<tr><td><a id="l358"></a><a href="#l358">358</a><td><tr><td><a id="l359"></a><a href="#l359">359</a><td><tr><td><a id="l360"></a><a href="#l360">360</a><td>/**<tr><td><a id="l361"></a><a href="#l361">361</a><td> * Removes an event listener which was added with listen().<tr><td><a id="l362"></a><a href="#l362">362</a><td> *<tr><td><a id="l363"></a><a href="#l363">363</a><td> * @param {EventTarget|goog.events.Listenable} src The target to stop<tr><td><a id="l364"></a><a href="#l364">364</a><td> * listening to events on.<tr><td><a id="l365"></a><a href="#l365">365</a><td> * @param {string|Array<string>|<tr><td><a id="l366"></a><a href="#l366">366</a><td> * !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}<tr><td><a id="l367"></a><a href="#l367">367</a><td> * type Event type or array of event types to unlisten to.<tr><td><a id="l368"></a><a href="#l368">368</a><td> * @param {function(?):?|{handleEvent:function(?):?}|null} listener The<tr><td><a id="l369"></a><a href="#l369">369</a><td> * listener function to remove.<tr><td><a id="l370"></a><a href="#l370">370</a><td> * @param {boolean=} opt_capt In DOM-compliant browsers, this determines<tr><td><a id="l371"></a><a href="#l371">371</a><td> * whether the listener is fired during the capture or bubble phase of the<tr><td><a id="l372"></a><a href="#l372">372</a><td> * event.<tr><td><a id="l373"></a><a href="#l373">373</a><td> * @param {Object=} opt_handler Element in whose scope to call the listener.<tr><td><a id="l374"></a><a href="#l374">374</a><td> * @return {?boolean} indicating whether the listener was there to remove.<tr><td><a id="l375"></a><a href="#l375">375</a><td> * @template EVENTOBJ<tr><td><a id="l376"></a><a href="#l376">376</a><td> */<tr><td><a id="l377"></a><a href="#l377">377</a><td>goog.events.unlisten = function(src, type, listener, opt_capt, opt_handler) {<tr><td><a id="l378"></a><a href="#l378">378</a><td> if (goog.isArray(type)) {<tr><td><a id="l379"></a><a href="#l379">379</a><td> for (var i = 0; i < type.length; i++) {<tr><td><a id="l380"></a><a href="#l380">380</a><td> goog.events.unlisten(src, type[i], listener, opt_capt, opt_handler);<tr><td><a id="l381"></a><a href="#l381">381</a><td> }<tr><td><a id="l382"></a><a href="#l382">382</a><td> return null;<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> listener = goog.events.wrapListener(listener);<tr><td><a id="l386"></a><a href="#l386">386</a><td> if (goog.events.Listenable.isImplementedBy(src)) {<tr><td><a id="l387"></a><a href="#l387">387</a><td> return src.unlisten(<tr><td><a id="l388"></a><a href="#l388">388</a><td> /** @type {string|!goog.events.EventId} */ (type),<tr><td><a id="l389"></a><a href="#l389">389</a><td> listener, opt_capt, opt_handler);<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> if (!src) {<tr><td><a id="l393"></a><a href="#l393">393</a><td> // TODO(chrishenry): We should tighten the API to only accept<tr><td><a id="l394"></a><a href="#l394">394</a><td> // non-null objects, or add an assertion here.<tr><td><a id="l395"></a><a href="#l395">395</a><td> return false;<tr><td><a id="l396"></a><a href="#l396">396</a><td> }<tr><td><a id="l397"></a><a href="#l397">397</a><td><tr><td><a id="l398"></a><a href="#l398">398</a><td> var capture = !!opt_capt;<tr><td><a id="l399"></a><a href="#l399">399</a><td> var listenerMap = goog.events.getListenerMap_(<tr><td><a id="l400"></a><a href="#l400">400</a><td> /** @type {!EventTarget} */ (src));<tr><td><a id="l401"></a><a href="#l401">401</a><td> if (listenerMap) {<tr><td><a id="l402"></a><a href="#l402">402</a><td> var listenerObj = listenerMap.getListener(<tr><td><a id="l403"></a><a href="#l403">403</a><td> /** @type {string|!goog.events.EventId} */ (type),<tr><td><a id="l404"></a><a href="#l404">404</a><td> listener, capture, opt_handler);<tr><td><a id="l405"></a><a href="#l405">405</a><td> if (listenerObj) {<tr><td><a id="l406"></a><a href="#l406">406</a><td> return goog.events.unlistenByKey(listenerObj);<tr><td><a id="l407"></a><a href="#l407">407</a><td> }<tr><td><a id="l408"></a><a href="#l408">408</a><td> }<tr><td><a id="l409"></a><a href="#l409">409</a><td><tr><td><a id="l410"></a><a href="#l410">410</a><td> return false;<tr><td><a id="l411"></a><a href="#l411">411</a><td>};<tr><td><a id="l412"></a><a href="#l412">412</a><td><tr><td><a id="l413"></a><a href="#l413">413</a><td><tr><td><a id="l414"></a><a href="#l414">414</a><td>/**<tr><td><a id="l415"></a><a href="#l415">415</a><td> * Removes an event listener which was added with listen() by the key<tr><td><a id="l416"></a><a href="#l416">416</a><td> * returned by listen().<tr><td><a id="l417"></a><a href="#l417">417</a><td> *<tr><td><a id="l418"></a><a href="#l418">418</a><td> * @param {goog.events.Key} key The key returned by listen() for this<tr><td><a id="l419"></a><a href="#l419">419</a><td> * event listener.<tr><td><a id="l420"></a><a href="#l420">420</a><td> * @return {boolean} indicating whether the listener was there to remove.<tr><td><a id="l421"></a><a href="#l421">421</a><td> */<tr><td><a id="l422"></a><a href="#l422">422</a><td>goog.events.unlistenByKey = function(key) {<tr><td><a id="l423"></a><a href="#l423">423</a><td> // TODO(chrishenry): Remove this check when tests that rely on this<tr><td><a id="l424"></a><a href="#l424">424</a><td> // are fixed.<tr><td><a id="l425"></a><a href="#l425">425</a><td> if (goog.isNumber(key)) {<tr><td><a id="l426"></a><a href="#l426">426</a><td> return false;<tr><td><a id="l427"></a><a href="#l427">427</a><td> }<tr><td><a id="l428"></a><a href="#l428">428</a><td><tr><td><a id="l429"></a><a href="#l429">429</a><td> var listener = /** @type {goog.events.ListenableKey} */ (key);<tr><td><a id="l430"></a><a href="#l430">430</a><td> if (!listener || listener.removed) {<tr><td><a id="l431"></a><a href="#l431">431</a><td> return false;<tr><td><a id="l432"></a><a href="#l432">432</a><td> }<tr><td><a id="l433"></a><a href="#l433">433</a><td><tr><td><a id="l434"></a><a href="#l434">434</a><td> var src = listener.src;<tr><td><a id="l435"></a><a href="#l435">435</a><td> if (goog.events.Listenable.isImplementedBy(src)) {<tr><td><a id="l436"></a><a href="#l436">436</a><td> return src.unlistenByKey(listener);<tr><td><a id="l437"></a><a href="#l437">437</a><td> }<tr><td><a id="l438"></a><a href="#l438">438</a><td><tr><td><a id="l439"></a><a href="#l439">439</a><td> var type = listener.type;<tr><td><a id="l440"></a><a href="#l440">440</a><td> var proxy = listener.proxy;<tr><td><a id="l441"></a><a href="#l441">441</a><td> if (src.removeEventListener) {<tr><td><a id="l442"></a><a href="#l442">442</a><td> src.removeEventListener(type, proxy, listener.capture);<tr><td><a id="l443"></a><a href="#l443">443</a><td> } else if (src.detachEvent) {<tr><td><a id="l444"></a><a href="#l444">444</a><td> src.detachEvent(goog.events.getOnString_(type), proxy);<tr><td><a id="l445"></a><a href="#l445">445</a><td> }<tr><td><a id="l446"></a><a href="#l446">446</a><td> goog.events.listenerCountEstimate_--;<tr><td><a id="l447"></a><a href="#l447">447</a><td><tr><td><a id="l448"></a><a href="#l448">448</a><td> var listenerMap = goog.events.getListenerMap_(<tr><td><a id="l449"></a><a href="#l449">449</a><td> /** @type {!EventTarget} */ (src));<tr><td><a id="l450"></a><a href="#l450">450</a><td> // TODO(chrishenry): Try to remove this conditional and execute the<tr><td><a id="l451"></a><a href="#l451">451</a><td> // first branch always. This should be safe.<tr><td><a id="l452"></a><a href="#l452">452</a><td> if (listenerMap) {<tr><td><a id="l453"></a><a href="#l453">453</a><td> listenerMap.removeByKey(listener);<tr><td><a id="l454"></a><a href="#l454">454</a><td> if (listenerMap.getTypeCount() == 0) {<tr><td><a id="l455"></a><a href="#l455">455</a><td> // Null the src, just because this is simple to do (and useful<tr><td><a id="l456"></a><a href="#l456">456</a><td> // for IE <= 7).<tr><td><a id="l457"></a><a href="#l457">457</a><td> listenerMap.src = null;<tr><td><a id="l458"></a><a href="#l458">458</a><td> // We don't use delete here because IE does not allow delete<tr><td><a id="l459"></a><a href="#l459">459</a><td> // on a window object.<tr><td><a id="l460"></a><a href="#l460">460</a><td> src[goog.events.LISTENER_MAP_PROP_] = null;<tr><td><a id="l461"></a><a href="#l461">461</a><td> }<tr><td><a id="l462"></a><a href="#l462">462</a><td> } else {<tr><td><a id="l463"></a><a href="#l463">463</a><td> listener.markAsRemoved();<tr><td><a id="l464"></a><a href="#l464">464</a><td> }<tr><td><a id="l465"></a><a href="#l465">465</a><td><tr><td><a id="l466"></a><a href="#l466">466</a><td> return true;<tr><td><a id="l467"></a><a href="#l467">467</a><td>};<tr><td><a id="l468"></a><a href="#l468">468</a><td><tr><td><a id="l469"></a><a href="#l469">469</a><td><tr><td><a id="l470"></a><a href="#l470">470</a><td>/**<tr><td><a id="l471"></a><a href="#l471">471</a><td> * Removes an event listener which was added with listenWithWrapper().<tr><td><a id="l472"></a><a href="#l472">472</a><td> *<tr><td><a id="l473"></a><a href="#l473">473</a><td> * @param {EventTarget|goog.events.Listenable} src The target to stop<tr><td><a id="l474"></a><a href="#l474">474</a><td> * listening to events on.<tr><td><a id="l475"></a><a href="#l475">475</a><td> * @param {goog.events.EventWrapper} wrapper Event wrapper to use.<tr><td><a id="l476"></a><a href="#l476">476</a><td> * @param {function(?):?|{handleEvent:function(?):?}|null} listener The<tr><td><a id="l477"></a><a href="#l477">477</a><td> * listener function to remove.<tr><td><a id="l478"></a><a href="#l478">478</a><td> * @param {boolean=} opt_capt In DOM-compliant browsers, this determines<tr><td><a id="l479"></a><a href="#l479">479</a><td> * whether the listener is fired during the capture or bubble phase of the<tr><td><a id="l480"></a><a href="#l480">480</a><td> * event.<tr><td><a id="l481"></a><a href="#l481">481</a><td> * @param {Object=} opt_handler Element in whose scope to call the listener.<tr><td><a id="l482"></a><a href="#l482">482</a><td> */<tr><td><a id="l483"></a><a href="#l483">483</a><td>goog.events.unlistenWithWrapper = function(src, wrapper, listener, opt_capt,<tr><td><a id="l484"></a><a href="#l484">484</a><td> opt_handler) {<tr><td><a id="l485"></a><a href="#l485">485</a><td> wrapper.unlisten(src, listener, opt_capt, opt_handler);<tr><td><a id="l486"></a><a href="#l486">486</a><td>};<tr><td><a id="l487"></a><a href="#l487">487</a><td><tr><td><a id="l488"></a><a href="#l488">488</a><td><tr><td><a id="l489"></a><a href="#l489">489</a><td>/**<tr><td><a id="l490"></a><a href="#l490">490</a><td> * Removes all listeners from an object. You can also optionally<tr><td><a id="l491"></a><a href="#l491">491</a><td> * remove listeners of a particular type.<tr><td><a id="l492"></a><a href="#l492">492</a><td> *<tr><td><a id="l493"></a><a href="#l493">493</a><td> * @param {Object|undefined} obj Object to remove listeners from. Must be an<tr><td><a id="l494"></a><a href="#l494">494</a><td> * EventTarget or a goog.events.Listenable.<tr><td><a id="l495"></a><a href="#l495">495</a><td> * @param {string|!goog.events.EventId=} opt_type Type of event to remove.<tr><td><a id="l496"></a><a href="#l496">496</a><td> * Default is all types.<tr><td><a id="l497"></a><a href="#l497">497</a><td> * @return {number} Number of listeners removed.<tr><td><a id="l498"></a><a href="#l498">498</a><td> */<tr><td><a id="l499"></a><a href="#l499">499</a><td>goog.events.removeAll = function(obj, opt_type) {<tr><td><a id="l500"></a><a href="#l500">500</a><td> // TODO(chrishenry): Change the type of obj to<tr><td><a id="l501"></a><a href="#l501">501</a><td> // (!EventTarget|!goog.events.Listenable).<tr><td><a id="l502"></a><a href="#l502">502</a><td><tr><td><a id="l503"></a><a href="#l503">503</a><td> if (!obj) {<tr><td><a id="l504"></a><a href="#l504">504</a><td> return 0;<tr><td><a id="l505"></a><a href="#l505">505</a><td> }<tr><td><a id="l506"></a><a href="#l506">506</a><td><tr><td><a id="l507"></a><a href="#l507">507</a><td> if (goog.events.Listenable.isImplementedBy(obj)) {<tr><td><a id="l508"></a><a href="#l508">508</a><td> return obj.removeAllListeners(opt_type);<tr><td><a id="l509"></a><a href="#l509">509</a><td> }<tr><td><a id="l510"></a><a href="#l510">510</a><td><tr><td><a id="l511"></a><a href="#l511">511</a><td> var listenerMap = goog.events.getListenerMap_(<tr><td><a id="l512"></a><a href="#l512">512</a><td> /** @type {!EventTarget} */ (obj));<tr><td><a id="l513"></a><a href="#l513">513</a><td> if (!listenerMap) {<tr><td><a id="l514"></a><a href="#l514">514</a><td> return 0;<tr><td><a id="l515"></a><a href="#l515">515</a><td> }<tr><td><a id="l516"></a><a href="#l516">516</a><td><tr><td><a id="l517"></a><a href="#l517">517</a><td> var count = 0;<tr><td><a id="l518"></a><a href="#l518">518</a><td> var typeStr = opt_type && opt_type.toString();<tr><td><a id="l519"></a><a href="#l519">519</a><td> for (var type in listenerMap.listeners) {<tr><td><a id="l520"></a><a href="#l520">520</a><td> if (!typeStr || type == typeStr) {<tr><td><a id="l521"></a><a href="#l521">521</a><td> // Clone so that we don't need to worry about unlistenByKey<tr><td><a id="l522"></a><a href="#l522">522</a><td> // changing the content of the ListenerMap.<tr><td><a id="l523"></a><a href="#l523">523</a><td> var listeners = listenerMap.listeners[type].concat();<tr><td><a id="l524"></a><a href="#l524">524</a><td> for (var i = 0; i < listeners.length; ++i) {<tr><td><a id="l525"></a><a href="#l525">525</a><td> if (goog.events.unlistenByKey(listeners[i])) {<tr><td><a id="l526"></a><a href="#l526">526</a><td> ++count;<tr><td><a id="l527"></a><a href="#l527">527</a><td> }<tr><td><a id="l528"></a><a href="#l528">528</a><td> }<tr><td><a id="l529"></a><a href="#l529">529</a><td> }<tr><td><a id="l530"></a><a href="#l530">530</a><td> }<tr><td><a id="l531"></a><a href="#l531">531</a><td> return count;<tr><td><a id="l532"></a><a href="#l532">532</a><td>};<tr><td><a id="l533"></a><a href="#l533">533</a><td><tr><td><a id="l534"></a><a href="#l534">534</a><td><tr><td><a id="l535"></a><a href="#l535">535</a><td>/**<tr><td><a id="l536"></a><a href="#l536">536</a><td> * Gets the listeners for a given object, type and capture phase.<tr><td><a id="l537"></a><a href="#l537">537</a><td> *<tr><td><a id="l538"></a><a href="#l538">538</a><td> * @param {Object} obj Object to get listeners for.<tr><td><a id="l539"></a><a href="#l539">539</a><td> * @param {string|!goog.events.EventId} type Event type.<tr><td><a id="l540"></a><a href="#l540">540</a><td> * @param {boolean} capture Capture phase?.<tr><td><a id="l541"></a><a href="#l541">541</a><td> * @return {Array<goog.events.Listener>} Array of listener objects.<tr><td><a id="l542"></a><a href="#l542">542</a><td> */<tr><td><a id="l543"></a><a href="#l543">543</a><td>goog.events.getListeners = function(obj, type, capture) {<tr><td><a id="l544"></a><a href="#l544">544</a><td> if (goog.events.Listenable.isImplementedBy(obj)) {<tr><td><a id="l545"></a><a href="#l545">545</a><td> return obj.getListeners(type, capture);<tr><td><a id="l546"></a><a href="#l546">546</a><td> } else {<tr><td><a id="l547"></a><a href="#l547">547</a><td> if (!obj) {<tr><td><a id="l548"></a><a href="#l548">548</a><td> // TODO(chrishenry): We should tighten the API to accept<tr><td><a id="l549"></a><a href="#l549">549</a><td> // !EventTarget|goog.events.Listenable, and add an assertion here.<tr><td><a id="l550"></a><a href="#l550">550</a><td> return [];<tr><td><a id="l551"></a><a href="#l551">551</a><td> }<tr><td><a id="l552"></a><a href="#l552">552</a><td><tr><td><a id="l553"></a><a href="#l553">553</a><td> var listenerMap = goog.events.getListenerMap_(<tr><td><a id="l554"></a><a href="#l554">554</a><td> /** @type {!EventTarget} */ (obj));<tr><td><a id="l555"></a><a href="#l555">555</a><td> return listenerMap ? listenerMap.getListeners(type, capture) : [];<tr><td><a id="l556"></a><a href="#l556">556</a><td> }<tr><td><a id="l557"></a><a href="#l557">557</a><td>};<tr><td><a id="l558"></a><a href="#l558">558</a><td><tr><td><a id="l559"></a><a href="#l559">559</a><td><tr><td><a id="l560"></a><a href="#l560">560</a><td>/**<tr><td><a id="l561"></a><a href="#l561">561</a><td> * Gets the goog.events.Listener for the event or null if no such listener is<tr><td><a id="l562"></a><a href="#l562">562</a><td> * in use.<tr><td><a id="l563"></a><a href="#l563">563</a><td> *<tr><td><a id="l564"></a><a href="#l564">564</a><td> * @param {EventTarget|goog.events.Listenable} src The target from<tr><td><a id="l565"></a><a href="#l565">565</a><td> * which to get listeners.<tr><td><a id="l566"></a><a href="#l566">566</a><td> * @param {?string|!goog.events.EventId<EVENTOBJ>} type The type of the event.<tr><td><a id="l567"></a><a href="#l567">567</a><td> * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null} listener The<tr><td><a id="l568"></a><a href="#l568">568</a><td> * listener function to get.<tr><td><a id="l569"></a><a href="#l569">569</a><td> * @param {boolean=} opt_capt In DOM-compliant browsers, this determines<tr><td><a id="l570"></a><a href="#l570">570</a><td> * whether the listener is fired during the<tr><td><a id="l571"></a><a href="#l571">571</a><td> * capture or bubble phase of the event.<tr><td><a id="l572"></a><a href="#l572">572</a><td> * @param {Object=} opt_handler Element in whose scope to call the listener.<tr><td><a id="l573"></a><a href="#l573">573</a><td> * @return {goog.events.ListenableKey} the found listener or null if not found.<tr><td><a id="l574"></a><a href="#l574">574</a><td> * @template EVENTOBJ<tr><td><a id="l575"></a><a href="#l575">575</a><td> */<tr><td><a id="l576"></a><a href="#l576">576</a><td>goog.events.getListener = function(src, type, listener, opt_capt, opt_handler) {<tr><td><a id="l577"></a><a href="#l577">577</a><td> // TODO(chrishenry): Change type from ?string to string, or add assertion.<tr><td><a id="l578"></a><a href="#l578">578</a><td> type = /** @type {string} */ (type);<tr><td><a id="l579"></a><a href="#l579">579</a><td> listener = goog.events.wrapListener(listener);<tr><td><a id="l580"></a><a href="#l580">580</a><td> var capture = !!opt_capt;<tr><td><a id="l581"></a><a href="#l581">581</a><td> if (goog.events.Lis