kontra
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Kontra HTML5 game development library
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<title>Kontra.js – Events</title>
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<div id="kontra-heading" class="nav-heading">Kontra</div>
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<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>
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<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('myEvent', callback);
emit('myEvent', 1, 2, 3); //=> {a: 1, b: 2, c: 3}
off('myEvent', 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('myEvent', callback);
emit('myEvent', 1, 2, 3); //=> {a: 1, b: 2, c: 3}
off('myEvent', 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 'kontra';
function callback(a, b, c) {
console.log({a, b, c});
});
on('myEvent', callback);
emit('myEvent', 1, 2, 3); //=> {a: 1, b: 2, c: 3}
off('myEvent', 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(​event[, args])</span>
</a>
</li>
<li>
<a href="api/events#off">
<span>off(​event, callback)</span>
</a>
</li>
<li>
<a href="api/events#on">
<span>on(​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(​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(​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(​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>
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