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usage.html
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<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Usage | Chart.js</title>
<meta name="generator" content="VuePress 1.8.3">
<link rel="icon" href="/docs/3.8.2/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
<link rel="preload" href="/docs/3.8.2/assets/css/0.styles.3fce5b00.css" as="style"><link rel="preload" href="/docs/3.8.2/assets/js/app.c111da59.js" as="script"><link rel="preload" href="/docs/3.8.2/assets/js/2.2c6184c9.js" as="script"><link rel="preload" href="/docs/3.8.2/assets/js/182.49e5d890.js" as="script"><link rel="prefetch" href="/docs/3.8.2/assets/js/10.854d336e.js"><link rel="prefetch" href="/docs/3.8.2/assets/js/100.b1c90bef.js"><link rel="prefetch" href="/docs/3.8.2/assets/js/101.ee6865cd.js"><link rel="prefetch" href="/docs/3.8.2/assets/js/102.043f739d.js"><link rel="prefetch" href="/docs/3.8.2/assets/js/103.9abeb170.js"><link rel="prefetch" href="/docs/3.8.2/assets/js/104.806c47ac.js"><link rel="prefetch" href="/docs/3.8.2/assets/js/105.69ebc565.js"><link rel="prefetch" href="/docs/3.8.2/assets/js/106.4eb54b93.js"><link rel="prefetch" href="/docs/3.8.2/assets/js/107.e7a708d1.js"><link rel="prefetch" href="/docs/3.8.2/assets/js/108.64308d8b.js"><link rel="prefetch" 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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><a href="/docs/3.8.2/" aria-current="page" class="sidebar-link">Chart.js</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Getting Started</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/3.8.2/getting-started/" aria-current="page" class="sidebar-link">Getting Started</a></li><li><a href="/docs/3.8.2/getting-started/installation.html" class="sidebar-link">Installation</a></li><li><a href="/docs/3.8.2/getting-started/integration.html" class="sidebar-link">Integration</a></li><li><a href="/docs/3.8.2/getting-started/usage.html" aria-current="page" class="active sidebar-link">Usage</a></li><li><a href="/docs/3.8.2/getting-started/v3-migration.html" class="sidebar-link">3.x Migration Guide</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>General</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Configuration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Chart Types</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Axes</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Developers</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="usage"><a href="#usage" class="header-anchor">#</a> Usage</h1> <p>Chart.js can be used with ES6 modules, plain JavaScript, and module loaders.</p> <h2 id="creating-a-chart"><a href="#creating-a-chart" class="header-anchor">#</a> Creating a Chart</h2> <p>To create a chart, we need to instantiate the <code>Chart</code> class. To do this, we need to pass in the node, jQuery instance, or 2d context of the canvas of where we want to draw the chart. Here's an example.</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>canvas</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>myChart<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>canvas</span><span class="token punctuation">></span></span>
</code></pre></div><div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token comment">// Any of the following formats may be used</span>
<span class="token keyword">const</span> ctx <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'myChart'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> ctx <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'myChart'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getContext</span><span class="token punctuation">(</span><span class="token string">'2d'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> ctx <span class="token operator">=</span> <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">'#myChart'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> ctx <span class="token operator">=</span> <span class="token string">'myChart'</span><span class="token punctuation">;</span>
</code></pre></div><p>Once you have the element or context, you're ready to instantiate a pre-defined chart-type or create your own!</p> <p>The following example instantiates a bar chart showing the number of votes for different colors and the y-axis starting at 0.</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>canvas</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>myChart<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>canvas</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
<span class="token keyword">const</span> ctx <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'myChart'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> myChart <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Chart</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token punctuation">{</span>
<span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'bar'</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">labels</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'Red'</span><span class="token punctuation">,</span> <span class="token string">'Blue'</span><span class="token punctuation">,</span> <span class="token string">'Yellow'</span><span class="token punctuation">,</span> <span class="token string">'Green'</span><span class="token punctuation">,</span> <span class="token string">'Purple'</span><span class="token punctuation">,</span> <span class="token string">'Orange'</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token literal-property property">datasets</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>
<span class="token literal-property property">label</span><span class="token operator">:</span> <span class="token string">'# of Votes'</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">19</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token literal-property property">backgroundColor</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token string">'rgba(255, 99, 132, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(54, 162, 235, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(255, 206, 86, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(75, 192, 192, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(153, 102, 255, 0.2)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(255, 159, 64, 0.2)'</span>
<span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token literal-property property">borderColor</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token string">'rgba(255, 99, 132, 1)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(54, 162, 235, 1)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(255, 206, 86, 1)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(75, 192, 192, 1)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(153, 102, 255, 1)'</span><span class="token punctuation">,</span>
<span class="token string">'rgba(255, 159, 64, 1)'</span>
<span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token literal-property property">borderWidth</span><span class="token operator">:</span> <span class="token number">1</span>
<span class="token punctuation">}</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">scales</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">y</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">beginAtZero</span><span class="token operator">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
</code></pre></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">7/24/2022, 6:42:33 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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