selenium-webdriver
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The official WebDriver JavaScript bindings from the Selenium project
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<meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"><meta http-equiv="Content-Language" content="en"><meta http-equiv="X-UA-Compatible" content="IE=edge"><title>EventEmitter</title><link href="dossier.css" rel="stylesheet" type="text/css"><header><div><form><div><input type="search" placeholder="Search" tabindex="1"></div></form></div></header><main><article><div class="parentlink"><b>Module:</b> <a href="module_selenium-webdriver.html">selenium-webdriver</a></div><div class="codelink"><a href="source/index.js.src.html#l54">View Source</a></div><h1>class EventEmitter</h1><dl><dt>Alias for <code><a href="class_webdriver_EventEmitter.html">webdriver.EventEmitter</a></code></dl><p>Object that can emit events for others to listen for. This is used instead
of Closure's event system because it is much more light weight. The API is
based on Node's EventEmitters.</p>
<h3>new EventEmitter()</h3><div><div class="fn-details"><div><b>Parameters</b></div><dl><dd>None.</dl></div></div><h2>Instance Methods</h2><div id="addListener" class="function"><div><h3>addListener(<wbr>type, listenerFn, opt_scope)<span class="codelink"><a href="source/lib/webdriver/events.js.src.html#l119">code »</a></span></h3><p>Registers a listener.</p>
<div><div class="fn-details"><div><b>Parameters</b></div><dl><dt>type<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></code><dd><p>The type of event to listen for.</p>
<dt>listenerFn<code>Function</code><dd><p>The function to invoke when the event is fired.</p>
<dt>opt_scope<code>?<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">Object</a>=</code><dd><p>The object in whose scope to invoke the listener.</p>
</dl></div><div class="fn-details"><div><b>Returns</b></div><dl><dt><code><a href="class_webdriver_EventEmitter.html">webdriver.EventEmitter</a></code><dd><p>A self reference.</p>
</dl></div></div></div></div><hr class="fn-sep"><div id="emit" class="function"><div><h3>emit(<wbr>type, var_args)<span class="codelink"><a href="source/lib/webdriver/events.js.src.html#l47">code »</a></span></h3><p>Fires an event and calls all listeners.</p>
<div><div class="fn-details"><div><b>Parameters</b></div><dl><dt>type<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></code><dd><p>The type of event to emit.</p>
<dt>var_args<code>...*</code><dd><p>Any arguments to pass to each listener.</p>
</dl></div></div></div></div><hr class="fn-sep"><div id="listeners" class="function"><div><h3>listeners(<wbr>type)<span class="codelink"><a href="source/lib/webdriver/events.js.src.html#l74">code »</a></span></h3><p>Returns a mutable list of listeners for a specific type of event.</p>
<div><div class="fn-details"><div><b>Parameters</b></div><dl><dt>type<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></code><dd><p>The type of event to retrieve the listeners for.</p>
</dl></div><div class="fn-details"><div><b>Returns</b></div><dl><dt><code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array">Array</a><{fn: Function, oneshot: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a>, scope: ?(<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">Object</a>)}></code><dd><p>The registered listeners for
the given event type.</p>
</dl></div></div></div></div><hr class="fn-sep"><div id="on" class="function"><div><h3>on(<wbr>type, listenerFn, opt_scope)<span class="codelink"><a href="source/lib/webdriver/events.js.src.html#l145">code »</a></span></h3><p>An alias for <code>#addListener()</code>.</p>
<div><div class="fn-details"><div><b>Parameters</b></div><dl><dt>type<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></code><dd><p>The type of event to listen for.</p>
<dt>listenerFn<code>Function</code><dd><p>The function to invoke when the event is fired.</p>
<dt>opt_scope<code>?<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">Object</a>=</code><dd><p>The object in whose scope to invoke the listener.</p>
</dl></div><div class="fn-details"><div><b>Returns</b></div><dl><dt><code><a href="class_webdriver_EventEmitter.html">webdriver.EventEmitter</a></code><dd><p>A self reference.</p>
</dl></div></div></div></div><hr class="fn-sep"><div id="once" class="function"><div><h3>once(<wbr>type, listenerFn, opt_scope)<span class="codelink"><a href="source/lib/webdriver/events.js.src.html#l133">code »</a></span></h3><p>Registers a one-time listener which will be called only the first time an
event is emitted, after which it will be removed.</p>
<div><div class="fn-details"><div><b>Parameters</b></div><dl><dt>type<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></code><dd><p>The type of event to listen for.</p>
<dt>listenerFn<code>Function</code><dd><p>The function to invoke when the event is fired.</p>
<dt>opt_scope<code>?<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">Object</a>=</code><dd><p>The object in whose scope to invoke the listener.</p>
</dl></div><div class="fn-details"><div><b>Returns</b></div><dl><dt><code><a href="class_webdriver_EventEmitter.html">webdriver.EventEmitter</a></code><dd><p>A self reference.</p>
</dl></div></div></div></div><hr class="fn-sep"><div id="removeAllListeners" class="function"><div><h3>removeAllListeners(<wbr>opt_type)<span class="codelink"><a href="source/lib/webdriver/events.js.src.html#l176">code »</a></span></h3><p>Removes all listeners for a specific type of event. If no event is
specified, all listeners across all types will be removed.</p>
<div><div class="fn-details"><div><b>Parameters</b></div><dl><dt>opt_type<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>=</code><dd><p>The type of event to remove listeners from.</p>
</dl></div><div class="fn-details"><div><b>Returns</b></div><dl><dt><code><a href="class_webdriver_EventEmitter.html">webdriver.EventEmitter</a></code><dd><p>A self reference.</p>
</dl></div></div></div></div><hr class="fn-sep"><div id="removeListener" class="function"><div><h3>removeListener(<wbr>type, listenerFn)<span class="codelink"><a href="source/lib/webdriver/events.js.src.html#l155">code »</a></span></h3><p>Removes a previously registered event listener.</p>
<div><div class="fn-details"><div><b>Parameters</b></div><dl><dt>type<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a></code><dd><p>The type of event to unregister.</p>
<dt>listenerFn<code>Function</code><dd><p>The handler function to remove.</p>
</dl></div><div class="fn-details"><div><b>Returns</b></div><dl><dt><code><a href="class_webdriver_EventEmitter.html">webdriver.EventEmitter</a></code><dd><p>A self reference.</p>
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