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kontra

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Kontra HTML5 game development library

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<!DOCTYPE html> <html lang="en"> <head> <title>Kontra.js – Events</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <base href="https://straker.github.io/kontra/"> <script> // adjust path based on location (github pages required kontra url) if (window.location.host.indexOf('localhost') !== -1) { let base = document.querySelector('base'); base.setAttribute('href', '/'); } </script> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/themes/prism.min.css"> <link rel="stylesheet" href="assets/styles.css"> <script src="assets/js/kontra.js"></script> </head> <body> <div class="content"> <header class="main-nav"> <div id="kontra-heading" class="nav-heading">Kontra</div> <a href="#main">Skip navigation</a> <nav> <button class="menu-button" aria-expanded="false" aria-controls="menu"><span aria-hidden="true"></span> Menu</button> <!-- add role=list back to list so screen readers still read it as list when css list-style: none is set @see https://web-a11y.slack.com/archives/C042TSFGN/p1501699529181172 --> <ul id="menu" role="list"> <li><a href="." >Introduction</a></li> <li><a href="getting-started" >Getting Started</a></li> <li><a href="download" >Download</a></li> <li><a href="tutorials" >Tutorials</a></li> <li><a href="made-with-kontra" >Made With Kontra</a></li> <li> <span id="api" class="nav-api-heading">API</span> <ul aria-labelledby="api"> <li><a href="api/animation" >Animation</a></li> <li><a href="api/assets" >Assets</a></li> <li><a href="api/core" >Core</a></li> <li><a href="api/events" aria-current="page">Events</a></li> <li><a href="api/gameLoop" >GameLoop</a></li> <li><a href="api/keyboard" >Keyboard</a></li> <li><a href="api/plugin" >Plugin</a></li> <li><a href="api/pointer" >Pointer</a></li> <li><a href="api/pool" >Pool</a></li> <li><a href="api/quadtree" >Quadtree</a></li> <li><a href="api/sprite" >Sprite</a></li> <li><a href="api/spriteSheet" >SpriteSheet</a></li> <li><a href="api/store" >Store</a></li> <li><a href="api/tileEngine" >TileEngine</a></li> <li><a href="api/vector" >Vector</a></li> </ul> </li> </ul> </nav> <div class="scroll-indicator" aria-hidden="true"><span>^</span></div> </header> <main id="main"> <div> <a href="https://github.com/straker/kontra" class="github-corner" aria-label="View source on GitHub"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a> <h1>Events </h1> <p>A simple event system, mostly created to support <a href="api/plugin">Plugins</a>. Allows you to hook into Kontra lifecycle events or create your own.</p> <div class="tablist"> <ul role="tablist"> <li role="presentation" data-tab="global"> <button role="tab" id="events-global-tab">Global Object</button> </li> <li role="presentation" data-tab="es"> <button role="tab" id="events-es-tab">ES Module Import</button> </li> <li role="presentation" data-tab="bundle"> <button role="tab" id="events-bundle-tab">Module Bundler</button> </li> <li role="presentation"></li> </ul> <section role="tabpanel" aria-labelledby=events-global-tab data-tabpanel="global"><pre><code class="language-js">let { on, off, emit } = kontra; function callback(a, b, c) { console.log({a, b, c}); }); on(&#39;myEvent&#39;, callback); emit(&#39;myEvent&#39;, 1, 2, 3); //=&gt; {a: 1, b: 2, c: 3} off(&#39;myEvent&#39;, callback);</code></pre></section> <section role="tabpanel" aria-labelledby=events-es-tab data-tabpanel="es"><pre><code class="language-js">import { on, off, emit } from 'path/to/kontra.mjs'; function callback(a, b, c) { console.log({a, b, c}); }); on(&#39;myEvent&#39;, callback); emit(&#39;myEvent&#39;, 1, 2, 3); //=&gt; {a: 1, b: 2, c: 3} off(&#39;myEvent&#39;, callback);</code></pre></section> <section role="tabpanel" aria-labelledby=events-bundle-tab data-tabpanel="bundle"><pre><code class="language-js">import { on, off, emit } from &#39;kontra&#39;; function callback(a, b, c) { console.log({a, b, c}); }); on(&#39;myEvent&#39;, callback); emit(&#39;myEvent&#39;, 1, 2, 3); //=&gt; {a: 1, b: 2, c: 3} off(&#39;myEvent&#39;, callback);</code></pre></section> </div> <section class="toc"> <h2 id="toc"><a href="#toc" class="section-link">Table of Contents<span aria-hidden="true">#</span></a></h2> <ul aria-labelledby="toc"> <li> <ul> <li><a href="api/events#lifecycle-events">Lifecycle Events</a></li> </ul> </li> <li> <h3 id="methods">Methods</h3> <ul aria-labelledby="methods"> <li> <a href="api/events#emit"> <span>emit(&#8203;event[, args])</span> </a> </li> <li> <a href="api/events#off"> <span>off(&#8203;event, callback)</span> </a> </li> <li> <a href="api/events#on"> <span>on(&#8203;event, callback)</span> </a> </li> </ul> </li> </ul> </section> <section> <h2 id="lifecycle-events"> <a href="#lifecycle-events" class="section-link"> <span>Lifecycle Events</span> <span aria-hidden="true">#</span> </a> </h2> <p>There are currently only two lifecycle events:</p> <ul> <li><code>init</code> - Emitted after <code>init()</code> is called.</li> <li><code>tick</code> - Emitted every frame of <a href="GameLoop">GameLoop</a> before the loops <code>update()</code> and <code>render()</code> functions are called.</li> </ul> </section> <section> <h2 id="emit"> <a href="api/events#emit" class="section-link"> <span>emit(&#8203;event[, args])</span> <span aria-hidden="true">#</span> </a> </h2> <p>Call all callback functions for the event. All arguments will be passed to the callback functions.</p> <h3 id="title-emit"><span class="visually-hidden">emit</span> Parameters</span></h3> <dl aria-labelledby="title-emit"> <dt> <code>event</code> </dt> <dd><p>String. Name of the event.</p> </dd> <dt> <code>args</code> <span class="optional">Optional</span> </dt> <dd><p>Any type. Arguments passed to all callbacks.</p> </dd> </dl> </section> <section> <h2 id="off"> <a href="api/events#off" class="section-link"> <span>off(&#8203;event, callback)</span> <span aria-hidden="true">#</span> </a> </h2> <p>Remove a callback for an event.</p> <h3 id="title-off"><span class="visually-hidden">off</span> Parameters</span></h3> <dl aria-labelledby="title-off"> <dt> <code>event</code> </dt> <dd><p>String. Name of the event.</p> </dd> <dt> <code>callback</code> </dt> <dd><p>Function. The function that was passed during registration.</p> </dd> </dl> </section> <section> <h2 id="on"> <a href="api/events#on" class="section-link"> <span>on(&#8203;event, callback)</span> <span aria-hidden="true">#</span> </a> </h2> <p>Register a callback for an event to be called whenever the event is emitted. The callback will be passed all arguments used in the <code>emit</code> call.</p> <h3 id="title-on"><span class="visually-hidden">on</span> Parameters</span></h3> <dl aria-labelledby="title-on"> <dt> <code>event</code> </dt> <dd><p>String. Name of the event.</p> </dd> <dt> <code>callback</code> </dt> <dd><p>Function. Function that will be called when the event is emitted.</p> </dd> </dl> </section> </div> </main> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/prism.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-javascript.min.js"></script> <script src="assets/js/navbar.js"></script> <script src="assets/js/exampleTabList.js"></script> </body> </html>