selenium-webdriver
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The official WebDriver JavaScript bindings from the Selenium project
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<!DOCTYPE html><meta charset="UTF-8"><meta http-equiv="Content-Language" content="en" /><title>webdriver.js</title><link href="../../../dossier.css" rel="stylesheet" type="text/css"><div id="main-wrapper"><input type="checkbox" id="sidenav-toggle" /><main><header><h1>lib/webdriver/webdriver.js</h1></header><pre><table class="srcfile"><tbody><tr><td><a name="l1" href="#l1">1</a><td>// Copyright 2011 Software Freedom Conservancy. All Rights Reserved.<tr><td><a name="l2" href="#l2">2</a><td>//<tr><td><a name="l3" href="#l3">3</a><td>// Licensed under the Apache License, Version 2.0 (the "License");<tr><td><a name="l4" href="#l4">4</a><td>// you may not use this file except in compliance with the License.<tr><td><a name="l5" href="#l5">5</a><td>// You may obtain a copy of the License at<tr><td><a name="l6" href="#l6">6</a><td>//<tr><td><a name="l7" href="#l7">7</a><td>// http://www.apache.org/licenses/LICENSE-2.0<tr><td><a name="l8" href="#l8">8</a><td>//<tr><td><a name="l9" href="#l9">9</a><td>// Unless required by applicable law or agreed to in writing, software<tr><td><a name="l10" href="#l10">10</a><td>// distributed under the License is distributed on an "AS IS" BASIS,<tr><td><a name="l11" href="#l11">11</a><td>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<tr><td><a name="l12" href="#l12">12</a><td>// See the License for the specific language governing permissions and<tr><td><a name="l13" href="#l13">13</a><td>// limitations under the License.<tr><td><a name="l14" href="#l14">14</a><td><tr><td><a name="l15" href="#l15">15</a><td>/**<tr><td><a name="l16" href="#l16">16</a><td> * @fileoverview The heart of the WebDriver JavaScript API.<tr><td><a name="l17" href="#l17">17</a><td> */<tr><td><a name="l18" href="#l18">18</a><td><tr><td><a name="l19" href="#l19">19</a><td>goog.provide('webdriver.Alert');<tr><td><a name="l20" href="#l20">20</a><td>goog.provide('webdriver.AlertPromise');<tr><td><a name="l21" href="#l21">21</a><td>goog.provide('webdriver.UnhandledAlertError');<tr><td><a name="l22" href="#l22">22</a><td>goog.provide('webdriver.WebDriver');<tr><td><a name="l23" href="#l23">23</a><td>goog.provide('webdriver.WebElement');<tr><td><a name="l24" href="#l24">24</a><td>goog.provide('webdriver.WebElementPromise');<tr><td><a name="l25" href="#l25">25</a><td><tr><td><a name="l26" href="#l26">26</a><td>goog.require('bot.Error');<tr><td><a name="l27" href="#l27">27</a><td>goog.require('bot.ErrorCode');<tr><td><a name="l28" href="#l28">28</a><td>goog.require('bot.response');<tr><td><a name="l29" href="#l29">29</a><td>goog.require('goog.array');<tr><td><a name="l30" href="#l30">30</a><td>goog.require('goog.object');<tr><td><a name="l31" href="#l31">31</a><td>goog.require('webdriver.ActionSequence');<tr><td><a name="l32" href="#l32">32</a><td>goog.require('webdriver.Command');<tr><td><a name="l33" href="#l33">33</a><td>goog.require('webdriver.CommandName');<tr><td><a name="l34" href="#l34">34</a><td>goog.require('webdriver.Key');<tr><td><a name="l35" href="#l35">35</a><td>goog.require('webdriver.Locator');<tr><td><a name="l36" href="#l36">36</a><td>goog.require('webdriver.Session');<tr><td><a name="l37" href="#l37">37</a><td>goog.require('webdriver.logging');<tr><td><a name="l38" href="#l38">38</a><td>goog.require('webdriver.promise');<tr><td><a name="l39" href="#l39">39</a><td><tr><td><a name="l40" href="#l40">40</a><td><tr><td><a name="l41" href="#l41">41</a><td>//////////////////////////////////////////////////////////////////////////////<tr><td><a name="l42" href="#l42">42</a><td>//<tr><td><a name="l43" href="#l43">43</a><td>// webdriver.WebDriver<tr><td><a name="l44" href="#l44">44</a><td>//<tr><td><a name="l45" href="#l45">45</a><td>//////////////////////////////////////////////////////////////////////////////<tr><td><a name="l46" href="#l46">46</a><td><tr><td><a name="l47" href="#l47">47</a><td><tr><td><a name="l48" href="#l48">48</a><td><tr><td><a name="l49" href="#l49">49</a><td>/**<tr><td><a name="l50" href="#l50">50</a><td> * Creates a new WebDriver client, which provides control over a browser.<tr><td><a name="l51" href="#l51">51</a><td> *<tr><td><a name="l52" href="#l52">52</a><td> * Every WebDriver command returns a {@code webdriver.promise.Promise} that<tr><td><a name="l53" href="#l53">53</a><td> * represents the result of that command. Callbacks may be registered on this<tr><td><a name="l54" href="#l54">54</a><td> * object to manipulate the command result or catch an expected error. Any<tr><td><a name="l55" href="#l55">55</a><td> * commands scheduled with a callback are considered sub-commands and will<tr><td><a name="l56" href="#l56">56</a><td> * execute before the next command in the current frame. For example:<tr><td><a name="l57" href="#l57">57</a><td> * <pre><code><tr><td><a name="l58" href="#l58">58</a><td> * var message = [];<tr><td><a name="l59" href="#l59">59</a><td> * driver.call(message.push, message, 'a').then(function() {<tr><td><a name="l60" href="#l60">60</a><td> * driver.call(message.push, message, 'b');<tr><td><a name="l61" href="#l61">61</a><td> * });<tr><td><a name="l62" href="#l62">62</a><td> * driver.call(message.push, message, 'c');<tr><td><a name="l63" href="#l63">63</a><td> * driver.call(function() {<tr><td><a name="l64" href="#l64">64</a><td> * alert('message is abc? ' + (message.join('') == 'abc'));<tr><td><a name="l65" href="#l65">65</a><td> * });<tr><td><a name="l66" href="#l66">66</a><td> * </code></pre><tr><td><a name="l67" href="#l67">67</a><td> *<tr><td><a name="l68" href="#l68">68</a><td> * @param {!(webdriver.Session|webdriver.promise.Promise)} session Either a<tr><td><a name="l69" href="#l69">69</a><td> * known session or a promise that will be resolved to a session.<tr><td><a name="l70" href="#l70">70</a><td> * @param {!webdriver.CommandExecutor} executor The executor to use when<tr><td><a name="l71" href="#l71">71</a><td> * sending commands to the browser.<tr><td><a name="l72" href="#l72">72</a><td> * @param {webdriver.promise.ControlFlow=} opt_flow The flow to<tr><td><a name="l73" href="#l73">73</a><td> * schedule commands through. Defaults to the active flow object.<tr><td><a name="l74" href="#l74">74</a><td> * @constructor<tr><td><a name="l75" href="#l75">75</a><td> */<tr><td><a name="l76" href="#l76">76</a><td>webdriver.WebDriver = function(session, executor, opt_flow) {<tr><td><a name="l77" href="#l77">77</a><td><tr><td><a name="l78" href="#l78">78</a><td> /** @private {!(webdriver.Session|webdriver.promise.Promise)} */<tr><td><a name="l79" href="#l79">79</a><td> this.session_ = session;<tr><td><a name="l80" href="#l80">80</a><td><tr><td><a name="l81" href="#l81">81</a><td> /** @private {!webdriver.CommandExecutor} */<tr><td><a name="l82" href="#l82">82</a><td> this.executor_ = executor;<tr><td><a name="l83" href="#l83">83</a><td><tr><td><a name="l84" href="#l84">84</a><td> /** @private {!webdriver.promise.ControlFlow} */<tr><td><a name="l85" href="#l85">85</a><td> this.flow_ = opt_flow || webdriver.promise.controlFlow();<tr><td><a name="l86" href="#l86">86</a><td>};<tr><td><a name="l87" href="#l87">87</a><td><tr><td><a name="l88" href="#l88">88</a><td><tr><td><a name="l89" href="#l89">89</a><td>/**<tr><td><a name="l90" href="#l90">90</a><td> * Creates a new WebDriver client for an existing session.<tr><td><a name="l91" href="#l91">91</a><td> * @param {!webdriver.CommandExecutor} executor Command executor to use when<tr><td><a name="l92" href="#l92">92</a><td> * querying for session details.<tr><td><a name="l93" href="#l93">93</a><td> * @param {string} sessionId ID of the session to attach to.<tr><td><a name="l94" href="#l94">94</a><td> * @param {webdriver.promise.ControlFlow=} opt_flow The control flow all driver<tr><td><a name="l95" href="#l95">95</a><td> * commands should execute under. Defaults to the<tr><td><a name="l96" href="#l96">96</a><td> * {@link webdriver.promise.controlFlow() currently active} control flow.<tr><td><a name="l97" href="#l97">97</a><td> * @return {!webdriver.WebDriver} A new client for the specified session.<tr><td><a name="l98" href="#l98">98</a><td> */<tr><td><a name="l99" href="#l99">99</a><td>webdriver.WebDriver.attachToSession = function(executor, sessionId, opt_flow) {<tr><td><a name="l100" href="#l100">100</a><td> return webdriver.WebDriver.acquireSession_(executor,<tr><td><a name="l101" href="#l101">101</a><td> new webdriver.Command(webdriver.CommandName.DESCRIBE_SESSION).<tr><td><a name="l102" href="#l102">102</a><td> setParameter('sessionId', sessionId),<tr><td><a name="l103" href="#l103">103</a><td> 'WebDriver.attachToSession()',<tr><td><a name="l104" href="#l104">104</a><td> opt_flow);<tr><td><a name="l105" href="#l105">105</a><td>};<tr><td><a name="l106" href="#l106">106</a><td><tr><td><a name="l107" href="#l107">107</a><td><tr><td><a name="l108" href="#l108">108</a><td>/**<tr><td><a name="l109" href="#l109">109</a><td> * Creates a new WebDriver session.<tr><td><a name="l110" href="#l110">110</a><td> * @param {!webdriver.CommandExecutor} executor The executor to create the new<tr><td><a name="l111" href="#l111">111</a><td> * session with.<tr><td><a name="l112" href="#l112">112</a><td> * @param {!webdriver.Capabilities} desiredCapabilities The desired<tr><td><a name="l113" href="#l113">113</a><td> * capabilities for the new session.<tr><td><a name="l114" href="#l114">114</a><td> * @param {webdriver.promise.ControlFlow=} opt_flow The control flow all driver<tr><td><a name="l115" href="#l115">115</a><td> * commands should execute under, including the initial session creation.<tr><td><a name="l116" href="#l116">116</a><td> * Defaults to the {@link webdriver.promise.controlFlow() currently active} <tr><td><a name="l117" href="#l117">117</a><td> * control flow.<tr><td><a name="l118" href="#l118">118</a><td> * @return {!webdriver.WebDriver} The driver for the newly created session.<tr><td><a name="l119" href="#l119">119</a><td> */<tr><td><a name="l120" href="#l120">120</a><td>webdriver.WebDriver.createSession = function(<tr><td><a name="l121" href="#l121">121</a><td> executor, desiredCapabilities, opt_flow) {<tr><td><a name="l122" href="#l122">122</a><td> return webdriver.WebDriver.acquireSession_(executor,<tr><td><a name="l123" href="#l123">123</a><td> new webdriver.Command(webdriver.CommandName.NEW_SESSION).<tr><td><a name="l124" href="#l124">124</a><td> setParameter('desiredCapabilities', desiredCapabilities),<tr><td><a name="l125" href="#l125">125</a><td> 'WebDriver.createSession()',<tr><td><a name="l126" href="#l126">126</a><td> opt_flow);<tr><td><a name="l127" href="#l127">127</a><td>};<tr><td><a name="l128" href="#l128">128</a><td><tr><td><a name="l129" href="#l129">129</a><td><tr><td><a name="l130" href="#l130">130</a><td>/**<tr><td><a name="l131" href="#l131">131</a><td> * Sends a command to the server that is expected to return the details for a<tr><td><a name="l132" href="#l132">132</a><td> * {@link webdriver.Session}. This may either be an existing session, or a<tr><td><a name="l133" href="#l133">133</a><td> * newly created one.<tr><td><a name="l134" href="#l134">134</a><td> * @param {!webdriver.CommandExecutor} executor Command executor to use when<tr><td><a name="l135" href="#l135">135</a><td> * querying for session details.<tr><td><a name="l136" href="#l136">136</a><td> * @param {!webdriver.Command} command The command to send to fetch the session<tr><td><a name="l137" href="#l137">137</a><td> * details.<tr><td><a name="l138" href="#l138">138</a><td> * @param {string} description A descriptive debug label for this action.<tr><td><a name="l139" href="#l139">139</a><td> * @param {webdriver.promise.ControlFlow=} opt_flow The control flow all driver<tr><td><a name="l140" href="#l140">140</a><td> * commands should execute under. Defaults to the<tr><td><a name="l141" href="#l141">141</a><td> * {@link webdriver.promise.controlFlow() currently active} control flow.<tr><td><a name="l142" href="#l142">142</a><td> * @return {!webdriver.WebDriver} A new WebDriver client for the session.<tr><td><a name="l143" href="#l143">143</a><td> * @private<tr><td><a name="l144" href="#l144">144</a><td> */<tr><td><a name="l145" href="#l145">145</a><td>webdriver.WebDriver.acquireSession_ = function(<tr><td><a name="l146" href="#l146">146</a><td> executor, command, description, opt_flow) {<tr><td><a name="l147" href="#l147">147</a><td> var flow = opt_flow || webdriver.promise.controlFlow();<tr><td><a name="l148" href="#l148">148</a><td> var session = flow.execute(function() {<tr><td><a name="l149" href="#l149">149</a><td> return webdriver.WebDriver.executeCommand_(executor, command).<tr><td><a name="l150" href="#l150">150</a><td> then(function(response) {<tr><td><a name="l151" href="#l151">151</a><td> bot.response.checkResponse(response);<tr><td><a name="l152" href="#l152">152</a><td> return new webdriver.Session(response['sessionId'],<tr><td><a name="l153" href="#l153">153</a><td> response['value']);<tr><td><a name="l154" href="#l154">154</a><td> });<tr><td><a name="l155" href="#l155">155</a><td> }, description);<tr><td><a name="l156" href="#l156">156</a><td> return new webdriver.WebDriver(session, executor, flow);<tr><td><a name="l157" href="#l157">157</a><td>};<tr><td><a name="l158" href="#l158">158</a><td><tr><td><a name="l159" href="#l159">159</a><td><tr><td><a name="l160" href="#l160">160</a><td>/**<tr><td><a name="l161" href="#l161">161</a><td> * Converts an object to its JSON representation in the WebDriver wire protocol.<tr><td><a name="l162" href="#l162">162</a><td> * When converting values of type object, the following steps will be taken:<tr><td><a name="l163" href="#l163">163</a><td> * <ol><tr><td><a name="l164" href="#l164">164</a><td> * <li>if the object is a WebElement, the return value will be the element's<tr><td><a name="l165" href="#l165">165</a><td> * server ID</li><tr><td><a name="l166" href="#l166">166</a><td> * <li>if the object provides a "toJSON" function, the return value of this<tr><td><a name="l167" href="#l167">167</a><td> * function will be returned</li><tr><td><a name="l168" href="#l168">168</a><td> * <li>otherwise, the value of each key will be recursively converted according<tr><td><a name="l169" href="#l169">169</a><td> * to the rules above.</li><tr><td><a name="l170" href="#l170">170</a><td> * </ol><tr><td><a name="l171" href="#l171">171</a><td> *<tr><td><a name="l172" href="#l172">172</a><td> * @param {*} obj The object to convert.<tr><td><a name="l173" href="#l173">173</a><td> * @return {!webdriver.promise.Promise.<?>} A promise that will resolve to the<tr><td><a name="l174" href="#l174">174</a><td> * input value's JSON representation.<tr><td><a name="l175" href="#l175">175</a><td> * @private<tr><td><a name="l176" href="#l176">176</a><td> * @see http://code.google.com/p/selenium/wiki/JsonWireProtocol<tr><td><a name="l177" href="#l177">177</a><td> */<tr><td><a name="l178" href="#l178">178</a><td>webdriver.WebDriver.toWireValue_ = function(obj) {<tr><td><a name="l179" href="#l179">179</a><td> if (webdriver.promise.isPromise(obj)) {<tr><td><a name="l180" href="#l180">180</a><td> return obj.then(webdriver.WebDriver.toWireValue_);<tr><td><a name="l181" href="#l181">181</a><td> }<tr><td><a name="l182" href="#l182">182</a><td> switch (goog.typeOf(obj)) {<tr><td><a name="l183" href="#l183">183</a><td> case 'array':<tr><td><a name="l184" href="#l184">184</a><td> return webdriver.promise.all(<tr><td><a name="l185" href="#l185">185</a><td> goog.array.map(/** @type {!Array} */ (obj),<tr><td><a name="l186" href="#l186">186</a><td> webdriver.WebDriver.toWireValue_));<tr><td><a name="l187" href="#l187">187</a><td> case 'object':<tr><td><a name="l188" href="#l188">188</a><td> if (obj instanceof webdriver.WebElement) {<tr><td><a name="l189" href="#l189">189</a><td> return obj.getId();<tr><td><a name="l190" href="#l190">190</a><td> }<tr><td><a name="l191" href="#l191">191</a><td> if (goog.isFunction(obj.toJSON)) {<tr><td><a name="l192" href="#l192">192</a><td> return webdriver.promise.fulfilled(obj.toJSON());<tr><td><a name="l193" href="#l193">193</a><td> }<tr><td><a name="l194" href="#l194">194</a><td> if (goog.isNumber(obj.nodeType) && goog.isString(obj.nodeName)) {<tr><td><a name="l195" href="#l195">195</a><td> throw Error([<tr><td><a name="l196" href="#l196">196</a><td> 'Invalid argument type: ', obj.nodeName, '(', obj.nodeType, ')'<tr><td><a name="l197" href="#l197">197</a><td> ].join(''));<tr><td><a name="l198" href="#l198">198</a><td> }<tr><td><a name="l199" href="#l199">199</a><td> return webdriver.promise.fullyResolved(<tr><td><a name="l200" href="#l200">200</a><td> goog.object.map(/** @type {!Object} */ (obj),<tr><td><a name="l201" href="#l201">201</a><td> webdriver.WebDriver.toWireValue_));<tr><td><a name="l202" href="#l202">202</a><td> case 'function':<tr><td><a name="l203" href="#l203">203</a><td> return webdriver.promise.fulfilled('' + obj);<tr><td><a name="l204" href="#l204">204</a><td> case 'undefined':<tr><td><a name="l205" href="#l205">205</a><td> return webdriver.promise.fulfilled(null);<tr><td><a name="l206" href="#l206">206</a><td> default:<tr><td><a name="l207" href="#l207">207</a><td> return webdriver.promise.fulfilled(obj);<tr><td><a name="l208" href="#l208">208</a><td> }<tr><td><a name="l209" href="#l209">209</a><td>};<tr><td><a name="l210" href="#l210">210</a><td><tr><td><a name="l211" href="#l211">211</a><td><tr><td><a name="l212" href="#l212">212</a><td>/**<tr><td><a name="l213" href="#l213">213</a><td> * Converts a value from its JSON representation according to the WebDriver wire<tr><td><a name="l214" href="#l214">214</a><td> * protocol. Any JSON object containing a<tr><td><a name="l215" href="#l215">215</a><td> * {@code webdriver.WebElement.ELEMENT_KEY} key will be decoded to a<tr><td><a name="l216" href="#l216">216</a><td> * {@code webdriver.WebElement} object. All other values will be passed through<tr><td><a name="l217" href="#l217">217</a><td> * as is.<tr><td><a name="l218" href="#l218">218</a><td> * @param {!webdriver.WebDriver} driver The driver instance to use as the<tr><td><a name="l219" href="#l219">219</a><td> * parent of any unwrapped {@code webdriver.WebElement} values.<tr><td><a name="l220" href="#l220">220</a><td> * @param {*} value The value to convert.<tr><td><a name="l221" href="#l221">221</a><td> * @return {*} The converted value.<tr><td><a name="l222" href="#l222">222</a><td> * @see http://code.google.com/p/selenium/wiki/JsonWireProtocol<tr><td><a name="l223" href="#l223">223</a><td> * @private<tr><td><a name="l224" href="#l224">224</a><td> */<tr><td><a name="l225" href="#l225">225</a><td>webdriver.WebDriver.fromWireValue_ = function(driver, value) {<tr><td><a name="l226" href="#l226">226</a><td> if (goog.isArray(value)) {<tr><td><a name="l227" href="#l227">227</a><td> value = goog.array.map(/**@type {goog.array.ArrayLike}*/ (value),<tr><td><a name="l228" href="#l228">228</a><td> goog.partial(webdriver.WebDriver.fromWireValue_, driver));<tr><td><a name="l229" href="#l229">229</a><td> } else if (value && goog.isObject(value) && !goog.isFunction(value)) {<tr><td><a name="l230" href="#l230">230</a><td> if (webdriver.WebElement.ELEMENT_KEY in value) {<tr><td><a name="l231" href="#l231">231</a><td> value = new webdriver.WebElement(driver, value);<tr><td><a name="l232" href="#l232">232</a><td> } else {<tr><td><a name="l233" href="#l233">233</a><td> value = goog.object.map(/**@type {!Object}*/ (value),<tr><td><a name="l234" href="#l234">234</a><td> goog.partial(webdriver.WebDriver.fromWireValue_, driver));<tr><td><a name="l235" href="#l235">235</a><td> }<tr><td><a name="l236" href="#l236">236</a><td> }<tr><td><a name="l237" href="#l237">237</a><td> return value;<tr><td><a name="l238" href="#l238">238</a><td>};<tr><td><a name="l239" href="#l239">239</a><td><tr><td><a name="l240" href="#l240">240</a><td><tr><td><a name="l241" href="#l241">241</a><td>/**<tr><td><a name="l242" href="#l242">242</a><td> * Translates a command to its wire-protocol representation before passing it<tr><td><a name="l243" href="#l243">243</a><td> * to the given {@code executor} for execution.<tr><td><a name="l244" href="#l244">244</a><td> * @param {!webdriver.CommandExecutor} executor The executor to use.<tr><td><a name="l245" href="#l245">245</a><td> * @param {!webdriver.Command} command The command to execute.<tr><td><a name="l246" href="#l246">246</a><td> * @return {!webdriver.promise.Promise} A promise that will resolve with the<tr><td><a name="l247" href="#l247">247</a><td> * command response.<tr><td><a name="l248" href="#l248">248</a><td> * @private<tr><td><a name="l249" href="#l249">249</a><td> */<tr><td><a name="l250" href="#l250">250</a><td>webdriver.WebDriver.executeCommand_ = function(executor, command) {<tr><td><a name="l251" href="#l251">251</a><td> return webdriver.WebDriver.toWireValue_(command.getParameters()).<tr><td><a name="l252" href="#l252">252</a><td> then(function(parameters) {<tr><td><a name="l253" href="#l253">253</a><td> command.setParameters(parameters);<tr><td><a name="l254" href="#l254">254</a><td> return webdriver.promise.checkedNodeCall(<tr><td><a name="l255" href="#l255">255</a><td> goog.bind(executor.execute, executor, command));<tr><td><a name="l256" href="#l256">256</a><td> });<tr><td><a name="l257" href="#l257">257</a><td>};<tr><td><a name="l258" href="#l258">258</a><td><tr><td><a name="l259" href="#l259">259</a><td><tr><td><a name="l260" href="#l260">260</a><td>/**<tr><td><a name="l261" href="#l261">261</a><td> * @return {!webdriver.promise.ControlFlow} The control flow used by this<tr><td><a name="l262" href="#l262">262</a><td> * instance.<tr><td><a name="l263" href="#l263">263</a><td> */<tr><td><a name="l264" href="#l264">264</a><td>webdriver.WebDriver.prototype.controlFlow = function() {<tr><td><a name="l265" href="#l265">265</a><td> return this.flow_;<tr><td><a name="l266" href="#l266">266</a><td>};<tr><td><a name="l267" href="#l267">267</a><td><tr><td><a name="l268" href="#l268">268</a><td><tr><td><a name="l269" href="#l269">269</a><td>/**<tr><td><a name="l270" href="#l270">270</a><td> * Schedules a {@code webdriver.Command} to be executed by this driver's<tr><td><a name="l271" href="#l271">271</a><td> * {@code webdriver.CommandExecutor}.<tr><td><a name="l272" href="#l272">272</a><td> * @param {!webdriver.Command} command The command to schedule.<tr><td><a name="l273" href="#l273">273</a><td> * @param {string} description A description of the command for debugging.<tr><td><a name="l274" href="#l274">274</a><td> * @return {!webdriver.promise.Promise.<T>} A promise that will be resolved<tr><td><a name="l275" href="#l275">275</a><td> * with the command result.<tr><td><a name="l276" href="#l276">276</a><td> * @template T<tr><td><a name="l277" href="#l277">277</a><td> */<tr><td><a name="l278" href="#l278">278</a><td>webdriver.WebDriver.prototype.schedule = function(command, description) {<tr><td><a name="l279" href="#l279">279</a><td> var self = this;<tr><td><a name="l280" href="#l280">280</a><td><tr><td><a name="l281" href="#l281">281</a><td> checkHasNotQuit();<tr><td><a name="l282" href="#l282">282</a><td> command.setParameter('sessionId', this.session_);<tr><td><a name="l283" href="#l283">283</a><td><tr><td><a name="l284" href="#l284">284</a><td> // If any of the command parameters are rejected promises, those<tr><td><a name="l285" href="#l285">285</a><td> // rejections may be reported as unhandled before the control flow<tr><td><a name="l286" href="#l286">286</a><td> // attempts to execute the command. To ensure parameters errors<tr><td><a name="l287" href="#l287">287</a><td> // propagate through the command itself, we resolve all of the<tr><td><a name="l288" href="#l288">288</a><td> // command parameters now, but suppress any errors until the ControlFlow<tr><td><a name="l289" href="#l289">289</a><td> // actually executes the command. This addresses scenarios like catching<tr><td><a name="l290" href="#l290">290</a><td> // an element not found error in:<tr><td><a name="l291" href="#l291">291</a><td> //<tr><td><a name="l292" href="#l292">292</a><td> // driver.findElement(By.id('foo')).click().thenCatch(function(e) {<tr><td><a name="l293" href="#l293">293</a><td> // if (e.code === bot.ErrorCode.NO_SUCH_ELEMENT) {<tr><td><a name="l294" href="#l294">294</a><td> // // Do something.<tr><td><a name="l295" href="#l295">295</a><td> // }<tr><td><a name="l296" href="#l296">296</a><td> // });<tr><td><a name="l297" href="#l297">297</a><td> var prepCommand = webdriver.WebDriver.toWireValue_(command.getParameters());<tr><td><a name="l298" href="#l298">298</a><td> prepCommand.thenCatch(goog.nullFunction);<tr><td><a name="l299" href="#l299">299</a><td><tr><td><a name="l300" href="#l300">300</a><td> var flow = this.flow_;<tr><td><a name="l301" href="#l301">301</a><td> var executor = this.executor_;<tr><td><a name="l302" href="#l302">302</a><td> return flow.execute(function() {<tr><td><a name="l303" href="#l303">303</a><td> // A call to WebDriver.quit() may have been scheduled in the same event<tr><td><a name="l304" href="#l304">304</a><td> // loop as this |command|, which would prevent us from detecting that the<tr><td><a name="l305" href="#l305">305</a><td> // driver has quit above. Therefore, we need to make another quick check.<tr><td><a name="l306" href="#l306">306</a><td> // We still check above so we can fail as early as possible.<tr><td><a name="l307" href="#l307">307</a><td> checkHasNotQuit();<tr><td><a name="l308" href="#l308">308</a><td><tr><td><a name="l309" href="#l309">309</a><td> // Retrieve resolved command parameters; any previously suppressed errors<tr><td><a name="l310" href="#l310">310</a><td> // will now propagate up through the control flow as part of the command<tr><td><a name="l311" href="#l311">311</a><td> // execution.<tr><td><a name="l312" href="#l312">312</a><td> return prepCommand.then(function(parameters) {<tr><td><a name="l313" href="#l313">313</a><td> command.setParameters(parameters);<tr><td><a name="l314" href="#l314">314</a><td> return webdriver.promise.checkedNodeCall(<tr><td><a name="l315" href="#l315">315</a><td> goog.bind(executor.execute, executor, command));<tr><td><a name="l316" href="#l316">316</a><td> });<tr><td><a name="l317" href="#l317">317</a><td> }, description).then(function(response) {<tr><td><a name="l318" href="#l318">318</a><td> try {<tr><td><a name="l319" href="#l319">319</a><td> bot.response.checkResponse(response);<tr><td><a name="l320" href="#l320">320</a><td> } catch (ex) {<tr><td><a name="l321" href="#l321">321</a><td> var value = response['value'];<tr><td><a name="l322" href="#l322">322</a><td> if (ex.code === bot.ErrorCode.UNEXPECTED_ALERT_OPEN) {<tr><td><a name="l323" href="#l323">323</a><td> var text = value && value['alert'] ? value['alert']['text'] : '';<tr><td><a name="l324" href="#l324">324</a><td> throw new webdriver.UnhandledAlertError(ex.message, text,<tr><td><a name="l325" href="#l325">325</a><td> new webdriver.Alert(self, text));<tr><td><a name="l326" href="#l326">326</a><td> }<tr><td><a name="l327" href="#l327">327</a><td> throw ex;<tr><td><a name="l328" href="#l328">328</a><td> }<tr><td><a name="l329" href="#l329">329</a><td> return webdriver.WebDriver.fromWireValue_(self, response['value']);<tr><td><a name="l330" href="#l330">330</a><td> });<tr><td><a name="l331" href="#l331">331</a><td><tr><td><a name="l332" href="#l332">332</a><td> function checkHasNotQuit() {<tr><td><a name="l333" href="#l333">333</a><td> if (!self.session_) {<tr><td><a name="l334" href="#l334">334</a><td> throw new Error('This driver instance does not have a valid session ID ' +<tr><td><a name="l335" href="#l335">335</a><td> '(did you call WebDriver.quit()?) and may no longer be ' +<tr><td><a name="l336" href="#l336">336</a><td> 'used.');<tr><td><a name="l337" href="#l337">337</a><td> }<tr><td><a name="l338" href="#l338">338</a><td> }<tr><td><a name="l339" href="#l339">339</a><td>};<tr><td><a name="l340" href="#l340">340</a><td><tr><td><a name="l341" href="#l341">341</a><td><tr><td><a name="l342" href="#l342">342</a><td>// ----------------------------------------------------------------------------<tr><td><a name="l343" href="#l343">343</a><td>// Client command functions:<tr><td><a name="l344" href="#l344">344</a><td>// ----------------------------------------------------------------------------<tr><td><a name="l345" href="#l345">345</a><td><tr><td><a name="l346" href="#l346">346</a><td><tr><td><a name="l347" href="#l347">347</a><td>/**<tr><td><a name="l348" href="#l348">348</a><td> * @return {!webdriver.promise.Promise.<!webdriver.Session>} A promise for this<tr><td><a name="l349" href="#l349">349</a><td> * client's session.<tr><td><a name="l350" href="#l350">350</a><td> */<tr><td><a name="l351" href="#l351">351</a><td>webdriver.WebDriver.prototype.getSession = function() {<tr><td><a name="l352" href="#l352">352</a><td> return webdriver.promise.when(this.session_);<tr><td><a name="l353" href="#l353">353</a><td>};<tr><td><a name="l354" href="#l354">354</a><td><tr><td><a name="l355" href="#l355">355</a><td><tr><td><a name="l356" href="#l356">356</a><td>/**<tr><td><a name="l357" href="#l357">357</a><td> * @return {!webdriver.promise.Promise.<!webdriver.Capabilities>} A promise<tr><td><a name="l358" href="#l358">358</a><td> * that will resolve with the this instance's capabilities.<tr><td><a name="l359" href="#l359">359</a><td> */<tr><td><a name="l360" href="#l360">360</a><td>webdriver.WebDriver.prototype.getCapabilities = function() {<tr><td><a name="l361" href="#l361">361</a><td> return webdriver.promise.when(this.session_, function(session) {<tr><td><a name="l362" href="#l362">362</a><td> return session.getCapabilities();<tr><td><a name="l363" href="#l363">363</a><td> });<tr><td><a name="l364" href="#l364">364</a><td>};<tr><td><a name="l365" href="#l365">365</a><td><tr><td><a name="l366" href="#l366">366</a><td><tr><td><a name="l367" href="#l367">367</a><td>/**<tr><td><a name="l368" href="#l368">368</a><td> * Schedules a command to quit the current session. After calling quit, this<tr><td><a name="l369" href="#l369">369</a><td> * instance will be invalidated and may no longer be used to issue commands<tr><td><a name="l370" href="#l370">370</a><td> * against the browser.<tr><td><a name="l371" href="#l371">371</a><td> * @return {!webdriver.promise.Promise.<void>} A promise that will be resolved<tr><td><a name="l372" href="#l372">372</a><td> * when the command has completed.<tr><td><a name="l373" href="#l373">373</a><td> */<tr><td><a name="l374" href="#l374">374</a><td>webdriver.WebDriver.prototype.quit = function() {<tr><td><a name="l375" href="#l375">375</a><td> var result = this.schedule(<tr><td><a name="l376" href="#l376">376</a><td> new webdriver.Command(webdriver.CommandName.QUIT),<tr><td><a name="l377" href="#l377">377</a><td> 'WebDriver.quit()');<tr><td><a name="l378" href="#l378">378</a><td> // Delete our session ID when the quit command finishes; this will allow us to<tr><td><a name="l379" href="#l379">379</a><td> // throw an error when attemnpting to use a driver post-quit.<tr><td><a name="l380" href="#l380">380</a><td> return result.thenFinally(goog.bind(function() {<tr><td><a name="l381" href="#l381">381</a><td> delete this.session_;<tr><td><a name="l382" href="#l382">382</a><td> }, this));<tr><td><a name="l383" href="#l383">383</a><td>};<tr><td><a name="l384" href="#l384">384</a><td><tr><td><a name="l385" href="#l385">385</a><td><tr><td><a name="l386" href="#l386">386</a><td>/**<tr><td><a name="l387" href="#l387">387</a><td> * Creates a new action sequence using this driver. The sequence will not be<tr><td><a name="l388" href="#l388">388</a><td> * scheduled for execution until {@link webdriver.ActionSequence#perform} is<tr><td><a name="l389" href="#l389">389</a><td> * called. Example:<tr><td><a name="l390" href="#l390">390</a><td> * <pre><code><tr><td><a name="l391" href="#l391">391</a><td> * driver.actions().<tr><td><a name="l392" href="#l392">392</a><td> * mouseDown(element1).<tr><td><a name="l393" href="#l393">393</a><td> * mouseMove(element2).<tr><td><a name="l394" href="#l394">394</a><td> * mouseUp().<tr><td><a name="l395" href="#l395">395</a><td> * perform();<tr><td><a name="l396" href="#l396">396</a><td> * </code></pre><tr><td><a name="l397" href="#l397">397</a><td> * @return {!webdriver.ActionSequence} A new action sequence for this instance.<tr><td><a name="l398" href="#l398">398</a><td> */<tr><td><a name="l399" href="#l399">399</a><td>webdriver.WebDriver.prototype.actions = function() {<tr><td><a name="l400" href="#l400">400</a><td> return new webdriver.ActionSequence(this);<tr><td><a name="l401" href="#l401">401</a><td>};<tr><td><a name="l402" href="#l402">402</a><td><tr><td><a name="l403" href="#l403">403</a><td><tr><td><a name="l404" href="#l404">404</a><td>/**<tr><td><a name="l405" href="#l405">405</a><td> * Schedules a command to execute JavaScript in the context of the currently<tr><td><a name="l406" href="#l406">406</a><td> * selected frame or window. The script fragment will be executed as the body<tr><td><a name="l407" href="#l407">407</a><td> * of an anonymous function. If the script is provided as a function object,<tr><td><a name="l408" href="#l408">408</a><td> * that function will be converted to a string for injection into the target<tr><td><a name="l409" href="#l409">409</a><td> * window.<tr><td><a name="l410" href="#l410">410</a><td> *<tr><td><a name="l411" href="#l411">411</a><td> * Any arguments provided in addition to the script will be included as script<tr><td><a name="l412" href="#l412">412</a><td> * arguments and may be referenced using the {@code arguments} object.<tr><td><a name="l413" href="#l413">413</a><td> * Arguments may be a boolean, number, string, or {@code webdriver.WebElement}.<tr><td><a name="l414" href="#l414">414</a><td> * Arrays and objects may also be used as script arguments as long as each item<tr><td><a name="l415" href="#l415">415</a><td> * adheres to the types previously mentioned.<tr><td><a name="l416" href="#l416">416</a><td> *<tr><td><a name="l417" href="#l417">417</a><td> * The script may refer to any variables accessible from the current window.<tr><td><a name="l418" href="#l418">418</a><td> * Furthermore, the script will execute in the window's context, thus<tr><td><a name="l419" href="#l419">419</a><td> * {@code document} may be used to refer to the current document. Any local<tr><td><a name="l420" href="#l420">420</a><td> * variables will not be available once the script has finished executing,<tr><td><a name="l421" href="#l421">421</a><td> * though global variables will persist.<tr><td><a name="l422" href="#l422">422</a><td> *<tr><td><a name="l423" href="#l423">423</a><td> * If the script has a return value (i.e. if the script contains a return<tr><td><a name="l424" href="#l424">424</a><td> * statement), then the following steps will be taken for resolving this<tr><td><a name="l425" href="#l425">425</a><td> * functions return value:<tr><td><a name="l426" href="#l426">426</a><td> * <ul><tr><td><a name="l427" href="#l427">427</a><td> * <li>For a HTML element, the value will resolve to a<tr><td><a name="l428" href="#l428">428</a><td> * {@code webdriver.WebElement}</li><tr><td><a name="l429" href="#l429">429</a><td> * <li>Null and undefined return values will resolve to null</li><tr><td><a name="l430" href="#l430">430</a><td> * <li>Booleans, numbers, and strings will resolve as is</li><tr><td><a name="l431" href="#l431">431</a><td> * <li>Functions will resolve to their string representation</li><tr><td><a name="l432" href="#l432">432</a><td> * <li>For arrays and objects, each member item will be converted according to<tr><td><a name="l433" href="#l433">433</a><td> * the rules above</li><tr><td><a name="l434" href="#l434">434</a><td> * </ul><tr><td><a name="l435" href="#l435">435</a><td> *<tr><td><a name="l436" href="#l436">436</a><td> * @param {!(string|Function)} script The script to execute.<tr><td><a name="l437" href="#l437">437</a><td> * @param {...*} var_args The arguments to pass to the script.<tr><td><a name="l438" href="#l438">438</a><td> * @return {!webdriver.promise.Promise.<T>} A promise that will resolve to the<tr><td><a name="l439" href="#l439">439</a><td> * scripts return value.<tr><td><a name="l440" href="#l440">440</a><td> * @template T<tr><td><a name="l441" href="#l441">441</a><td> */<tr><td><a name="l442" href="#l442">442</a><td>webdriver.WebDriver.prototype.executeScript = function(script, var_args) {<tr><td><a name="l443" href="#l443">443</a><td> if (goog.isFunction(script)) {<tr><td><a name="l444" href="#l444">444</a><td> script = 'return (' + script + ').apply(null, arguments);';<tr><td><a name="l445" href="#l445">445</a><td> }<tr><td><a name="l446" href="#l446">446</a><td> return this.schedule(<tr><td><a name="l447" href="#l447">447</a><td> new webdriver.Command(webdriver.CommandName.EXECUTE_SCRIPT).<tr><td><a name="l448" href="#l448">448</a><td> setParameter('script', script).<tr><td><a name="l449" href="#l449">449</a><td> setParameter('args', goog.array.slice(arguments, 1)),<tr><td><a name="l450" href="#l450">450</a><td> 'WebDriver.executeScript()');<tr><td><a name="l451" href="#l451">451</a><td>};<tr><td><a name="l452" href="#l452">452</a><td><tr><td><a name="l453" href="#l453">453</a><td><tr><td><a name="l454" href="#l454">454</a><td>/**<tr><td><a name="l455" href="#l455">455</a><td> * Schedules a command to execute asynchronous JavaScript in the context of the<tr><td><a name="l456" href="#l456">456</a><td> * currently selected frame or window. The script fragment will be executed as<tr><td><a name="l457" href="#l457">457</a><td> * the body of an anonymous function. If the script is provided as a function<tr><td><a name="l458" href="#l458">458</a><td> * object, that function will be converted to a string for injection into the<tr><td><a name="l459" href="#l459">459</a><td> * target window.<tr><td><a name="l460" href="#l460">460</a><td> *<tr><td><a name="l461" href="#l461">461</a><td> * Any arguments provided in addition to the script will be included as script<tr><td><a name="l462" href="#l462">462</a><td> * arguments and may be referenced using the {@code arguments} object.<tr><td><a name="l463" href="#l463">463</a><td> * Arguments may be a boolean, number, string, or {@code webdriver.WebElement}.<tr><td><a name="l464" href="#l464">464</a><td> * Arrays and objects may also be used as script arguments as long as each item<tr><td><a name="l465" href="#l465">465</a><td> * adheres to the types previously mentioned.<tr><td><a name="l466" href="#l466">466</a><td> *<tr><td><a name="l467" href="#l467">467</a><td> * Unlike executing synchronous JavaScript with<tr><td><a name="l468" href="#l468">468</a><td> * {@code webdriver.WebDriver.prototype.executeScript}, scripts executed with<tr><td><a name="l469" href="#l469">469</a><td> * this function must explicitly signal they are finished by invoking the<tr><td><a name="l470" href="#l470">470</a><td> * provided callback. This callback will always be injected into the<tr><td><a name="l471" href="#l471">471</a><td> * executed function as the last argument, and thus may be referenced with<tr><td><a name="l472" href="#l472">472</a><td> * {@code arguments[arguments.length - 1]}. The following steps will be taken<tr><td><a name="l473" href="#l473">473</a><td> * for resolving this functions return value against the first argument to the<tr><td><a name="l474" href="#l474">474</a><td> * script's callback function:<tr><td><a name="l475" href="#l475">475</a><td> * <ul><tr><td><a name="l476" href="#l476">476</a><td> * <li>For a HTML element, the value will resolve to a<tr><td><a name="l477" href="#l477">477</a><td> * {@code webdriver.WebElement}</li><tr><td><a name="l478" href="#l478">478</a><td> * <li>Null and undefined return values will resolve to null</li><tr><td><a name="l479" href="#l479">479</a><td> * <li>Booleans, numbers, and strings will resolve as is</li><tr><td><a name="l480" href="#l480">480</a><td> * <li>Functions will resolve to their string representation</li><tr><td><a name="l481" href="#l481">481</a><td> * <li>For arrays and objects, each member item will be converted according to<tr><td><a name="l482" href="#l482">482</a><td> * the rules above</li><tr><td><a name="l483" href="#l483">483</a><td> * </ul><tr><td><a name="l484" href="#l484">484</a><td> *<tr><td><a name="l485" href="#l485">485</a><td> * Example #1: Performing a sleep that is synchronized with the currently<tr><td><a name="l486" href="#l486">486</a><td> * selected window:<tr><td><a name="l487" href="#l487">487</a><td> * <code><pre><tr><td><a name="l488" href="#l488">488</a><td> * var start = new Date().getTime();<tr><td><a name="l489" href="#l489">489</a><td> * driver.executeAsyncScript(<tr><td><a name="l490" href="#l490">490</a><td> * 'window.setTimeout(arguments[arguments.length - 1], 500);').<tr><td><a name="l491" href="#l491">491</a><td> * then(function() {<tr><td><a name="l492" href="#l492">492</a><td> * console.log('Elapsed time: ' + (new Date().getTime() - start) + ' ms');<tr><td><a name="l493" href="#l493">493</a><td> * });<tr><td><a name="l494" href="#l494">494</a><td> * </pre></code><tr><td><a name="l495" href="#l495">495</a><td> *<tr><td><a name="l496" href="#l496">496</a><td> * Example #2: Synchronizing a test with an AJAX application:<tr><td><a name="l497" href="#l497">497</a><td> * <code><pre><tr><td><a name="l498" href="#l498">498</a><td> * var button = driver.findElement(By.id('compose-button'));<tr><td><a name="l499" href="#l499">499</a><td> * button.click();<tr><td><a name="l500" href="#l500">500</a><td> * driver.executeAsyncScript(<tr><td><a name="l501" href="#l501">501</a><td> * 'var callback = arguments[arguments.length - 1];' +<tr><td><a name="l502" href="#l502">502</a><td> * 'mailClient.getComposeWindowWidget().onload(callback);');<tr><td><a name="l503" href="#l503">503</a><td> * driver.switchTo().frame('composeWidget');<tr><td><a name="l504" href="#l504">504</a><td> * driver.findElement(By.id('to')).sendKeys('dog@example.com');<tr><td><a name="l505" href="#l505">505</a><td> * </pre></code><tr><td><a name="l506" href="#l506">506</a><td> *<tr><td><a name="l507" href="#l507">507</a><td> * Example #3: Injecting a XMLHttpRequest and waiting for the result. In this<tr><td><a name="l508" href="#l508">508</a><td> * example, the inject script is specified with a function literal. When using<tr><td><a name="l509" href="#l509">509</a><td> * this format, the function is converted to a string for injection, so it<tr><td><a name="l510" href="#l510">510</a><td> * should not reference any symbols not defined in the scope of the page under<tr><td><a name="l511" href="#l511">511</a><td> * test.<tr><td><a name="l512" href="#l512">512</a><td> * <code><pre><tr><td><a name="l513" href="#l513">513</a><td> * driver.executeAsyncScript(function() {<tr><td><a name="l514" href="#l514">514</a><td> * var callback = arguments[arguments.length - 1];<tr><td><a name="l515" href="#l515">515</a><td> * var xhr = new XMLHttpRequest();<tr><td><a name="l516" href="#l516">516</a><td> * xhr.open("GET", "/resource/data.json", true);<tr><td><a name="l517" href="#l517">517</a><td> * xhr.onreadystatechange = function() {<tr><td><a name="l518" href="#l518">518</a><td> * if (xhr.readyState == 4) {<tr><td><a name="l519" href="#l519">519</a><td> * callback(xhr.responseText);<tr><td><a name="l520" href="#l520">520</a><td> * }<tr><td><a name="l521" href="#l521">521</a><td> * }<tr><td><a name="l522" href="#l522">522</a><td> * xhr.send('');<tr><td><a name="l523" href="#l523">523</a><td> * }).then(function(str) {<tr><td><a name="l524" href="#l524">524</a><td> * console.log(JSON.parse(str)['food']);<tr><td><a name="l525" href="#l525">525</a><td> * });<tr><td><a name="l526" href="#l526">526</a><td> * </pre></code><tr><td><a name="l527" href="#l527">527</a><td> *<tr><td><a name="l528" href="#l528">528</a><td> * @param {!(string|Function)} script The script to execute.<tr><td><a name="l529" href="#l529">529</a><td> * @param {...*} var_args The arguments to pass to the script.<tr><td><a name="l530" href="#l530">530</a><td> * @return {!webdriver.promise.Promise.<T>} A promise that will resolve to the<tr><td><a name="l531" href="#l531">531</a><td> * scripts return value.<tr><td><a name="l532" href="#l532">532</a><td> * @template T<tr><td><a name="l533" href="#l533">533</a><td> */<tr><td><a name="l534" href="#l534">534</a><td>webdriver.WebDriver.prototype.executeAsyncScript = function(script, var_args) {<tr><td><a name="l535" href="#l535">535</a><td> if (goog.isFunction(script)) {<tr><td><a name="l536" href="#l536">536</a><td> script = 'return (' + script + ').apply(null, arguments);';<tr><td><a name="l537" href="#l537">537</a><td> }<tr><td><a name="l538" href="#l538">538</a><td> return this.schedule(<tr><td><a name="l539" href="#l539">539</a><td> new webdriver.Command(webdriver.CommandName.EXECUTE_ASYNC_SCRIPT).<tr><td><a name="l540" href="#l540">540</a><td> setParameter('script', script).<tr><td><a name="l541" href="#l541">541</a><td> setParameter('args', goog.array.slice(arguments, 1)),<tr><td><a name="l542" href="#l542">542</a><td> 'WebDriver.executeScript()');<tr><td><a name="l543" href="#l543">543</a><td>};<tr><td><a name="l544" href="#l544">544</a><td><tr><td><a name="l545" href="#l545">545</a><td><tr><td><a name="l546" href="#l546">546</a><td>/**<tr><td><a name="l547" href="#l547">547</a><td> * Schedules a command to execute a custom function.<tr><td><a name="l548" href="#l548">548</a><td> * @param {function(...): (T|webdriver.promise.Promise.<T>)} fn The function to<tr><td><a name="l549" href="#l549">549</a><td> * execute.<tr><td><a name="l550" href="#l550">550</a><td> * @param {Object=} opt_scope The object in whose scope to execute the function.<tr><td><a name="l551" href="#l551">551</a><td> * @param {...*} var_args Any arguments to pass to the function.<tr><td><a name="l552" href="#l552">552</a><td> * @return {!webdriver.promise.Promise.<T>} A promise that will be resolved'<tr><td><a name="l553" href="#l553">553</a><td> * with the function's result.<tr><td><a name="l554" href="#l554">554</a><td> * @template T<tr><td><a name="l555" href="#l555">555</a><td> */<tr><td><a name="l556" href="#l556">556</a><td>webdriver.WebDriver.prototype.call = function(fn, opt_scope, var_args) {<tr><td><a name="l557" href="#l557">557</a><td> var args = goog.array.slice(arguments, 2);<tr><td><a name="l558" href="#l558">558</a><td> var flow = this.flow_;<tr><td><a name="l559" href="#l559">559</a><td> return flow.execute(function() {<tr><td><a name="l560" href="#l560">560</a><td> return webdriver.promise.fullyResolved(args).then(function(args) {<tr><td><a name="l561" href="#l561">561</a><td> if (webdriver.promise.isGenerator(fn)) {<tr><td><a name="l562" href="#l562">562</a><td> args.unshift(fn, opt_scope);<tr><td><a name="l563" href="#l563">563</a><td> return webdriver.promise.consume.apply(null, args);<tr><td><a name="l564" href="#l564">564</a><td> }<tr><td><a name="l565" href="#l565">565</a><td> return fn.apply(opt_scope, args);<tr><td><a name="l566" href="#l566">566</a><td> });<tr><td><a name="l567" href="#l567">567</a><td> }, 'WebDriver.call(' + (fn.name || 'function') + ')');<tr><td><a name="l568" href="#l568">568</a><td>};<tr><td><a name="l569" href="#l569">569</a><td><tr><td><a name="l570" href="#l570">570</a><td><tr><td><a name="l571" href="#l571">571</a><td>/**<tr><td><a name="l572" href="#l572">572</a><td> * Schedules a command to wait for a condition to hold, as defined by some<tr><td><a name="l573" href="#l573">573</a><td> * user supplied function. If any errors occur while evaluating the wait, they<tr><td><a name="l574" href="#l574">574</a><td> * will be allowed to propagate.<tr><td><a name="l575" href="#l575">575</a><td> *<tr><td><a name="l576" href="#l576">576</a><td> * <p>In the event a condition returns a {@link webdriver.promise.Promise}, the<tr><td><a name="