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<!DOCTYPE html>
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<title>Updating Charts | Chart.js</title>
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<meta name="description" content="Open source HTML5 Charts for your website">
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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/latest/" 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/latest/developers/" aria-current="page" class="sidebar-link">Developers</a></li><li><a href="/docs/latest/developers/api.html" class="sidebar-link">API</a></li><li><a href="/docs/latest/developers/axes.html" class="sidebar-link">New Axes</a></li><li><a href="/docs/latest/developers/charts.html" class="sidebar-link">New Charts</a></li><li><a href="/docs/latest/developers/contributing.html" class="sidebar-link">Contributing</a></li><li><a href="/docs/latest/developers/plugins.html" class="sidebar-link">Plugins</a></li><li><a href="/docs/latest/developers/publishing.html" class="sidebar-link">Publishing an extension</a></li><li><a href="/docs/latest/api/" class="sidebar-link">TypeDoc</a></li><li><a href="/docs/latest/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, to remove it you can pop it again.</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> newData</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>newData<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 <code>options</code> 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 update a specific scale by its id as well.</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">4/15/2025, 1:19:05 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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