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1009 lines
14 KiB
HTML
1009 lines
14 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>JSDoc: Class: EventEmitter</title>
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</head>
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<body>
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<div id="main">
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<h1 class="page-title">Class: EventEmitter</h1>
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<section>
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<header>
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<h2><span class="attribs"><span class="type-signature"></span></span>
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<span class="ancestors"><a href="module-util.html">util</a>.</span>EventEmitter<span class="signature">()</span><span class="type-signature"></span></h2>
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</header>
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<article>
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<div class="container-overview">
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<h4 class="name" id="EventEmitter"><span class="type-signature"></span>new EventEmitter<span class="signature">()</span><span class="type-signature"></span></h4>
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<div class="description">
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<p>EventEmitter implements the classic observer/observable pattern.</p>
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<p>Note: this is heavily inspired by http://www.datchley.name/es6-eventemitter/</p>
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</div>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>
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<a href="util_EventEmitter.js.html">util/EventEmitter.js</a>, <a href="util_EventEmitter.js.html#line14">line 14</a>
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</li></ul></dd>
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</dl>
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<h5>Example</h5>
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<pre class="prettyprint"><code>let observable = new EventEmitter();
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let uuid1 = observable.on('change', data => { console.log(data); });
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observable.emit("change", { a: 1 });
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observable.off("change", uuid1);
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observable.emit("change", { a: 1 });</code></pre>
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</div>
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<h3 class="subsection-title">Methods</h3>
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<h4 class="name" id="emit"><span class="type-signature"></span>emit<span class="signature">(name, data)</span><span class="type-signature"> → {boolean}</span></h4>
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<div class="description">
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Emit an event with a given name and associated data.
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</div>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>name</code></td>
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<td class="type">
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<span class="param-type">String</span>
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</td>
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<td class="description last">the name of the event</td>
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</tr>
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<tr>
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<td class="name"><code>data</code></td>
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<td class="type">
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<span class="param-type">object</span>
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</td>
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<td class="description last">the data of the event</td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>
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<a href="util_EventEmitter.js.html">util/EventEmitter.js</a>, <a href="util_EventEmitter.js.html#line124">line 124</a>
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</li></ul></dd>
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</dl>
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<h5>Returns:</h5>
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<div class="param-desc">
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true if at least one listener has been registered for that event, and false otherwise
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</div>
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<dl>
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<dt>
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Type
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</dt>
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<dd>
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<span class="param-type">boolean</span>
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</dd>
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</dl>
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<h4 class="name" id="off"><span class="type-signature"></span>off<span class="signature">(name, listener)</span><span class="type-signature"></span></h4>
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<div class="description">
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Remove the listener with the given uuid associated to the given event name.
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</div>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>name</code></td>
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<td class="type">
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<span class="param-type">String</span>
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</td>
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<td class="description last">the name of the event</td>
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</tr>
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<tr>
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<td class="name"><code>listener</code></td>
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<td class="type">
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<span class="param-type"><a href="module-util.EventEmitter.html#~Listener">module:util.EventEmitter~Listener</a></span>
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</td>
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<td class="description last">a listener called upon emission of the event</td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>
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<a href="util_EventEmitter.js.html">util/EventEmitter.js</a>, <a href="util_EventEmitter.js.html#line102">line 102</a>
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</li></ul></dd>
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</dl>
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<h4 class="name" id="on"><span class="type-signature"></span>on<span class="signature">(name, listener)</span><span class="type-signature"></span></h4>
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<div class="description">
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Register a new listener for events with the given name emitted by this instance.
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</div>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>name</code></td>
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<td class="type">
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<span class="param-type">String</span>
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</td>
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<td class="description last">the name of the event</td>
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</tr>
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<tr>
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<td class="name"><code>listener</code></td>
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<td class="type">
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<span class="param-type"><a href="module-util.EventEmitter.html#~Listener">module:util.EventEmitter~Listener</a></span>
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</td>
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<td class="description last">a listener called upon emission of the event</td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>
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<a href="util_EventEmitter.js.html">util/EventEmitter.js</a>, <a href="util_EventEmitter.js.html#line46">line 46</a>
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</li></ul></dd>
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</dl>
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<h5>Returns:</h5>
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<div class="param-desc">
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string - the unique identifier associated with that (event, listener) pair (useful to remove the listener)
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</div>
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<h4 class="name" id="once"><span class="type-signature"></span>once<span class="signature">(name, listener)</span><span class="type-signature"></span></h4>
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<div class="description">
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Register a new listener for the given event name, and remove it as soon as the event has been emitted.
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</div>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>name</code></td>
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<td class="type">
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<span class="param-type">String</span>
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</td>
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<td class="description last">the name of the event</td>
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</tr>
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<tr>
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<td class="name"><code>listener</code></td>
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<td class="type">
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<span class="param-type"><a href="module-util.EventEmitter.html#~Listener">module:util.EventEmitter~Listener</a></span>
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</td>
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<td class="description last">a listener called upon emission of the event</td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>
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<a href="util_EventEmitter.js.html">util/EventEmitter.js</a>, <a href="util_EventEmitter.js.html#line78">line 78</a>
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</li></ul></dd>
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</dl>
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<h5>Returns:</h5>
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<div class="param-desc">
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string - the unique identifier associated with that (event, listener) pair (useful to remove the listener)
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</div>
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<h3 class="subsection-title">Type Definitions</h3>
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<h4 class="name" id="~Listener"><span class="type-signature"></span>Listener<span class="signature">(data)</span><span class="type-signature"></span></h4>
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<div class="description">
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Listener called when this instance emits an event for which it is registered.
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</div>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>data</code></td>
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<td class="type">
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<span class="param-type">object</span>
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</td>
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<td class="description last">the data passed to the listener</td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>
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<a href="util_EventEmitter.js.html">util/EventEmitter.js</a>, <a href="util_EventEmitter.js.html#line38">line 38</a>
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</li></ul></dd>
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</dl>
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</article>
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</section>
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</div>
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