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Updating Charts
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<h1 id="updating-charts">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">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>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">addData</span>(<span class="hljs-params">chart, label, data</span>) </span>{
chart.data.labels.push(label);
chart.data.datasets.forEach((dataset) => {
dataset.data.push(data);
});
chart.update();
}
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">removeData</span>(<span class="hljs-params">chart</span>) </span>{
chart.data.labels.pop();
chart.data.datasets.forEach((dataset) => {
dataset.data.pop();
});
chart.update();
}
</code></pre>
<h2 id="updating-options">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>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">updateConfigByMutating</span>(<span class="hljs-params">chart</span>) </span>{
chart.options.title.text = <span class="hljs-string">'new title'</span>;
chart.update();
}
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">updateConfigAsNewObject</span>(<span class="hljs-params">chart</span>) </span>{
chart.options = {
responsive: <span class="hljs-literal">true</span>,
title:{
display:<span class="hljs-literal">true</span>,
text: <span class="hljs-string">'Chart.js'</span>
},
scales: {
xAxes: [{
display: <span class="hljs-literal">true</span>
}],
yAxes: [{
display: <span class="hljs-literal">true</span>
}]
}
}
chart.update();
}
</code></pre>
<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>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">updateScales</span>(<span class="hljs-params">chart</span>) </span>{
<span class="hljs-keyword">var</span> xScale = chart.scales[<span class="hljs-string">'x-axis-0'</span>];
<span class="hljs-keyword">var</span> yScale = chart.scales[<span class="hljs-string">'y-axis-0'</span>];
chart.options.scales = {
xAxes: [{
id: <span class="hljs-string">'newId'</span>,
display: <span class="hljs-literal">true</span>
}],
yAxes: [{
display: <span class="hljs-literal">true</span>,
type: <span class="hljs-string">'logarithmic'</span>
}]
}
chart.update();
<span class="hljs-comment">// need to update the reference</span>
xScale = chart.scales[<span class="hljs-string">'newId'</span>];
yScale = chart.scales[<span class="hljs-string">'y-axis-0'</span>];
}
</code></pre>
<p>You can also update a specific scale either by specifying its index or id.</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">updateScale</span>(<span class="hljs-params">chart</span>) </span>{
chart.options.scales.yAxes[<span class="hljs-number">0</span>] = {
type: <span class="hljs-string">'logarithmic'</span>
}
chart.update();
}
</code></pre>
<p>Code sample for updating options can be found in <a href="../../samples/scales/toggle-scale-type.html">toggle-scale-type.html</a>.</p>
<h2 id="preventing-animations">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 a duration of <code>0</code>. This will render the chart synchronously and without an animation.</p>
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