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<!DOCTYPE html>
<html lang="en">
<head>
<title>Kontra.js – Button</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="custom-builds" >Custom Builds</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/button" aria-current="page">Button</a></li>
<li><a href="api/collision" >Collision</a></li>
<li><a href="api/core" >Core</a></li>
<li><a href="api/events" >Events</a></li>
<li><a href="api/gameLoop" >GameLoop</a></li>
<li><a href="api/gameobject" >GameObject</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/scene" >Scene</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/text" >Text</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>Button(​properties)
</h1>
<p>An accessible button. Supports screen readers and keyboard navigation using the Tab key. Don't forget to call <a href="/api/pointer#initPointer">initPointer</a> and <a href="/api/pointer#track">track</a> to have pointer events enabled on the button.</p>
<div class="tablist">
<ul role="tablist">
<li role="presentation" data-tab="global">
<button role="tab" id="button-global-tab">Global Object</button>
</li>
<li role="presentation" data-tab="es">
<button role="tab" id="button-es-tab">ES Module Import</button>
</li>
<li role="presentation" data-tab="bundle">
<button role="tab" id="button-bundle-tab">Module Bundler</button>
</li>
<li role="presentation"></li>
</ul>
<section role="tabpanel" aria-labelledby=button-global-tab data-tabpanel="global"><pre><code class="language-js">let { initPointer, track, Button } = kontra;
initPointer();
button = Button({
x: 200,
y: 200,
text: 'Click me',
color: 'white',
font: '20px Arial',
onFocus() {
this.color = 'red';
canvas.style.cursor = 'pointer';
},
onBlur() {
this.color = 'white';
canvas.style.cursor = 'initial';
},
onDown() {
this.color = 'blue';
},
onUp() {
this.color = this.focused ? 'red' : 'white';
console.log('click');
}
});
track(button);
button.render();
```js</code></pre></section>
<section role="tabpanel" aria-labelledby=button-es-tab data-tabpanel="es"><pre><code class="language-js">import { initPointer, track, Button } from 'path/to/kontra.mjs';
initPointer();
button = Button({
x: 200,
y: 200,
text: 'Click me',
color: 'white',
font: '20px Arial',
onFocus() {
this.color = 'red';
canvas.style.cursor = 'pointer';
},
onBlur() {
this.color = 'white';
canvas.style.cursor = 'initial';
},
onDown() {
this.color = 'blue';
},
onUp() {
this.color = this.focused ? 'red' : 'white';
console.log('click');
}
});
track(button);
button.render();
```js</code></pre></section>
<section role="tabpanel" aria-labelledby=button-bundle-tab data-tabpanel="bundle"><pre><code class="language-js">import { initPointer, track, Button } from 'kontra';
initPointer();
button = Button({
x: 200,
y: 200,
text: 'Click me',
color: 'white',
font: '20px Arial',
onFocus() {
this.color = 'red';
canvas.style.cursor = 'pointer';
},
onBlur() {
this.color = 'white';
canvas.style.cursor = 'initial';
},
onDown() {
this.color = 'blue';
},
onUp() {
this.color = this.focused ? 'red' : 'white';
console.log('click');
}
});
track(button);
button.render();
```js</code></pre></section>
</div>
<p><strong>Extends:</strong> <a href="api/text">Text</a></p>
<h3 id="title-Button"><span class="visually-hidden">Button</span> Parameters</span></h3>
<dl aria-labelledby="title-Button">
<dt>
<code>properties</code>
</dt>
<dd><p>Object. Properties of the button (in addition to all Text properties).</p>
</dd>
<dt>
<code>properties.onEnable</code>
<span class="optional">Optional</span>
</dt>
<dd><p>Function. Function called when the button is enabled.</p>
</dd>
<dt>
<code>properties.onDisable</code>
<span class="optional">Optional</span>
</dt>
<dd><p>Function. Function called when the button is disabled.</p>
</dd>
<dt>
<code>properties.onFocus</code>
<span class="optional">Optional</span>
</dt>
<dd><p>Function. Function called when the button is focused either by the pointer or keyboard.</p>
</dd>
<dt>
<code>properties.onBlur</code>
<span class="optional">Optional</span>
</dt>
<dd><p>Function. Function called when the button losses focus either by the pointer or keyboard.</p>
</dd>
<dt>
<code>properties.onUp</code>
<span class="optional">Optional</span>
</dt>
<dd><p>Function. Function called when the button is clicked either by the pointer or keyboard.</p>
</dd>
</dl>
<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>
<h3 id="properties">Properties</h3>
<ul aria-labelledby="properties">
<li>
<a href="api/button#disabled">
<span>Button​.disabled</span>
</a>
</li>
<li>
<a href="api/button#focused">
<span>Button​.focused</span>
</a>
</li>
</ul>
</li>
<li>
<h3 id="methods">Methods</h3>
<ul aria-labelledby="methods">
<li>
<a href="api/button#blur">
<span>Button​.blur(​)</span>
</a>
</li>
<li>
<a href="api/button#destroy">
<span>Button​.destroy(​)</span>
</a>
</li>
<li>
<a href="api/button#disable">
<span>Button​.disable(​)</span>
</a>
</li>
<li>
<a href="api/button#enable">
<span>Button​.enable(​)</span>
</a>
</li>
<li>
<a href="api/button#focus">
<span>Button​.focus(​)</span>
</a>
</li>
<li>
<a href="api/button#onBlur">
<span>Button​.onBlur(​)</span>
</a>
</li>
<li>
<a href="api/button#onDisable">
<span>Button​.onDisable(​)</span>
</a>
</li>
<li>
<a href="api/button#onEnable">
<span>Button​.onEnable(​)</span>
</a>
</li>
<li>
<a href="api/button#onFocus">
<span>Button​.onFocus(​)</span>
</a>
</li>
</ul>
</li>
</ul>
</section>
<section>
<h2 id="blur">
<a href="api/button#blur" class="section-link">
<span>Button​.blur(​)</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Blur the button. Calls <a href="/api/button#onBlur">onBlur</a> if passed.</p>
</section>
<section>
<h2 id="destroy">
<a href="api/button#destroy" class="section-link">
<span>Button​.destroy(​)</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Clean up the button.</p>
</section>
<section>
<h2 id="disable">
<a href="api/button#disable" class="section-link">
<span>Button​.disable(​)</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Disable the button. Calls <a href="/api/button#onDisable">onDisable</a> if passed.</p>
</section>
<section>
<h2 id="disabled">
<a href="api/button#disabled" class="section-link">
<span>Button​.disabled</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Boolean. If the button is disabled.</p>
</section>
<section>
<h2 id="enable">
<a href="api/button#enable" class="section-link">
<span>Button​.enable(​)</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Enable the button. Calls <a href="/api/button#onEnable">onEnable</a> if passed.</p>
</section>
<section>
<h2 id="focus">
<a href="api/button#focus" class="section-link">
<span>Button​.focus(​)</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Focus the button. Calls <a href="/api/button#onFOcus">onFOcus</a> if passed.</p>
</section>
<section>
<h2 id="focused">
<a href="api/button#focused" class="section-link">
<span>Button​.focused</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Boolean. If the button is focused.</p>
</section>
<section>
<h2 id="onBlur">
<a href="api/button#onBlur" class="section-link">
<span>Button​.onBlur(​)</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Function called when then button is blurred. Override this function to have the button do something when blurred.</p>
</section>
<section>
<h2 id="onDisable">
<a href="api/button#onDisable" class="section-link">
<span>Button​.onDisable(​)</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Function called when then button is disabled. Override this function to have the button do something when disabled.</p>
</section>
<section>
<h2 id="onEnable">
<a href="api/button#onEnable" class="section-link">
<span>Button​.onEnable(​)</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Function called when then button is enabled. Override this function to have the button do something when enabled.</p>
</section>
<section>
<h2 id="onFocus">
<a href="api/button#onFocus" class="section-link">
<span>Button​.onFocus(​)</span>
<span aria-hidden="true">#</span>
</a>
</h2>
<p>Function called when then button is focused. Override this function to have the button do something when focused.</p>
</section>
</div>
</main>
</div>
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