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<!DOCTYPE HTML>
<html lang="" >
<head>
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<title>Responsive · GitBook</title>
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Bar
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Bubble
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Area
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Time
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Linear
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Labelling
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Styling
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Chart.js API
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Updating Charts
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<!-- Title -->
<h1>
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<a href=".." >Responsive</a>
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<section class="normal markdown-section">
<h1 id="responsive-charts">Responsive Charts</h1>
<p>When it comes to change the chart size based on the window size, a major limitation is that the canvas <em>render</em> size (<code>canvas.width</code> and <code>.height</code>) can <strong>not</strong> be expressed with relative values, contrary to the <em>display</em> size (<code>canvas.style.width</code> and <code>.height</code>). Furthermore, these sizes are independent from each other and thus the canvas <em>render</em> size does not adjust automatically based on the <em>display</em> size, making the rendering inaccurate.</p>
<p>The following examples <strong>do not work</strong>:</p>
<ul>
<li><code><canvas height="40vh" width="80vw"></code>: <strong>invalid</strong> values, the canvas doesn't resize (<a href="https://codepen.io/chartjs/pen/oWLZaR" target="_blank">example</a>)</li>
<li><code><canvas style="height:40vh; width:80vw"></code>: <strong>invalid</strong> behavior, the canvas is resized but becomes blurry (<a href="https://codepen.io/chartjs/pen/WjxpmO" target="_blank">example</a>)</li>
</ul>
<p>Chart.js provides a <a href="#configuration-options">few options</a> to enable responsiveness and control the resize behavior of charts by detecting when the canvas <em>display</em> size changes and update the <em>render</em> size accordingly.</p>
<h2 id="configuration-options">Configuration Options</h2>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>responsive</code></td>
<td><code>Boolean</code></td>
<td><code>true</code></td>
<td>Resizes the chart canvas when its container does (<a href="#important-note">important note...</a>).</td>
</tr>
<tr>
<td><code>responsiveAnimationDuration</code></td>
<td><code>Number</code></td>
<td><code>0</code></td>
<td>Duration in milliseconds it takes to animate to new size after a resize event.</td>
</tr>
<tr>
<td><code>maintainAspectRatio</code></td>
<td><code>Boolean</code></td>
<td><code>true</code></td>
<td>Maintain the original canvas aspect ratio <code>(width / height)</code> when resizing.</td>
</tr>
<tr>
<td><code>onResize</code></td>
<td><code>Function</code></td>
<td><code>null</code></td>
<td>Called when a resize occurs. Gets passed two arguments: the chart instance and the new size.</td>
</tr>
</tbody>
</table>
<h2 id="important-note">Important Note</h2>
<p>Detecting when the canvas size changes can not be done directly from the <code>CANVAS</code> element. Chart.js uses its parent container to update the canvas <em>render</em> and <em>display</em> sizes. However, this method requires the container to be <strong>relatively positioned</strong> and <strong>dedicated to the chart canvas only</strong>. Responsiveness can then be achieved by setting relative values for the container size (<a href="https://codepen.io/chartjs/pen/YVWZbz" target="_blank">example</a>):</p>
<pre><code class="lang-html"><span class="hljs-tag"><<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"chart-container"</span> <span class="hljs-attr">style</span>=<span class="hljs-string">"position: relative; height:40vh; width:80vw"</span>></span>
<span class="hljs-tag"><<span class="hljs-name">canvas</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"chart"</span>></span><span class="hljs-tag"></<span class="hljs-name">canvas</span>></span>
<span class="hljs-tag"></<span class="hljs-name">div</span>></span>
</code></pre>
<p>The chart can also be programmatically resized by modifying the container size:</p>
<pre><code class="lang-javascript">chart.canvas.parentNode.style.height = <span class="hljs-string">'128px'</span>;
</code></pre>
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