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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>Updating Charts | Chart.js</title>
<meta name="generator" content="VuePress 1.9.7">
<link rel="icon" href="/docs/next/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
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</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="Community Menu" class="dropdown-title"><span class="title">Ecosystem</span> <span class="arrow down"></span></button> <button type="button" aria-label="Community Menu" class="mobile-dropdown-title"><span class="title">Ecosystem</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://github.com/chartjs/awesome" target="_blank" rel="noopener noreferrer" class="nav-link external">
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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></li><li class="dropdown-item"><!----> <a href="https://stackoverflow.com/questions/tagged/chart.js" target="_blank" rel="noopener noreferrer" class="nav-link external">
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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></li></ul></div></div> <a href="https://github.com/chartjs/Chart.js" target="_blank" rel="noopener noreferrer" class="repo-link">
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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/next/" aria-current="page" class="sidebar-link">Chart.js</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Getting Started</span> <span class="arrow right"></span></p> <!----></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 open"><span>Developers</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/next/developers/" aria-current="page" class="sidebar-link">Developers</a></li><li><a href="/docs/next/developers/api.html" class="sidebar-link">API</a></li><li><a href="/docs/next/developers/axes.html" class="sidebar-link">New Axes</a></li><li><a href="/docs/next/developers/charts.html" class="sidebar-link">New Charts</a></li><li><a href="/docs/next/developers/contributing.html" class="sidebar-link">Contributing</a></li><li><a href="/docs/next/developers/plugins.html" class="sidebar-link">Plugins</a></li><li><a href="/docs/next/developers/publishing.html" class="sidebar-link">Publishing an extension</a></li><li><a href="/docs/next/api/" class="sidebar-link">TypeDoc</a></li><li><a href="/docs/next/developers/updates.html" aria-current="page" class="active sidebar-link">Updating Charts</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Migration</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="updating-charts"><a href="#updating-charts" class="header-anchor">#</a> Updating Charts</h1> <p>It's pretty common to want to update charts after they've been created. When the chart data or options are changed, Chart.js will animate to the new data values and options.</p> <h2 id="adding-or-removing-data"><a href="#adding-or-removing-data" class="header-anchor">#</a> Adding or Removing Data</h2> <p>Adding and removing data is supported by changing the data array. To add data, just add data into the data array as seen in this example.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">function</span> <span class="token function">addData</span><span class="token punctuation">(</span><span class="token parameter">chart<span class="token punctuation">,</span> label<span class="token punctuation">,</span> data</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
chart<span class="token punctuation">.</span>data<span class="token punctuation">.</span>labels<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>label<span class="token punctuation">)</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span>data<span class="token punctuation">.</span>datasets<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">dataset</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
dataset<span class="token punctuation">.</span>data<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>data<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>
chart<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">function</span> <span class="token function">removeData</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
chart<span class="token punctuation">.</span>data<span class="token punctuation">.</span>labels<span class="token punctuation">.</span><span class="token function">pop</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span>data<span class="token punctuation">.</span>datasets<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">dataset</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
dataset<span class="token punctuation">.</span>data<span class="token punctuation">.</span><span class="token function">pop</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>
chart<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="updating-options"><a href="#updating-options" class="header-anchor">#</a> Updating Options</h2> <p>To update the options, mutating the options property in place or passing in a new options object are supported.</p> <ul><li>If the options are mutated in place, other option properties would be preserved, including those calculated by Chart.js.</li> <li>If created as a new object, it would be like creating a new chart with the options - old options would be discarded.</li></ul> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">function</span> <span class="token function">updateConfigByMutating</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
chart<span class="token punctuation">.</span>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>title<span class="token punctuation">.</span>text <span class="token operator">=</span> <span class="token string">'new title'</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">function</span> <span class="token function">updateConfigAsNewObject</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
chart<span class="token punctuation">.</span>options <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token literal-property property">responsive</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">title</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">display</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token literal-property property">text</span><span class="token operator">:</span> <span class="token string">'Chart.js'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</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">x</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">display</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 literal-property property">y</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">display</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>
chart<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>Scales can be updated separately without changing other options.
To update the scales, pass in an object containing all the customization including those unchanged ones.</p> <p>Variables referencing any one from <code>chart.scales</code> would be lost after updating scales with a new <code>id</code> or the changed <code>type</code>.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">function</span> <span class="token function">updateScales</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">let</span> xScale <span class="token operator">=</span> chart<span class="token punctuation">.</span>scales<span class="token punctuation">.</span>x<span class="token punctuation">;</span>
<span class="token keyword">let</span> yScale <span class="token operator">=</span> chart<span class="token punctuation">.</span>scales<span class="token punctuation">.</span>y<span class="token punctuation">;</span>
chart<span class="token punctuation">.</span>options<span class="token punctuation">.</span>scales <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token literal-property property">newId</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">display</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 literal-property property">y</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">display</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'logarithmic'</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// need to update the reference</span>
xScale <span class="token operator">=</span> chart<span class="token punctuation">.</span>scales<span class="token punctuation">.</span>newId<span class="token punctuation">;</span>
yScale <span class="token operator">=</span> chart<span class="token punctuation">.</span>scales<span class="token punctuation">.</span>y<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>You can also update a specific scale either by its id.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">function</span> <span class="token function">updateScale</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
chart<span class="token punctuation">.</span>options<span class="token punctuation">.</span>scales<span class="token punctuation">.</span>y <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'logarithmic'</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>Code sample for updating options can be found in <a href="https://www.chartjs.org/docs/latest/samples/area/line-datasets.html" target="_blank" rel="noopener noreferrer">line-datasets.html<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>.</p> <h2 id="preventing-animations"><a href="#preventing-animations" class="header-anchor">#</a> Preventing Animations</h2> <p>Sometimes when a chart updates, you may not want an animation. To achieve this you can call <code>update</code> with <code>'none'</code> as mode.</p> <div class="language-javascript extra-class"><pre class="language-javascript"><code>myChart<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span><span class="token string">'none'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">11/13/2022, 8:16:32 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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