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Updating Charts
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< h1 id = "updating-charts" > Updating Charts< / h1 >
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< 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 >
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< 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();
}
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< span class = "hljs-function" > < span class = "hljs-keyword" > function< / span > < span class = "hljs-title" > removeData< / span > (< span class = "hljs-params" > chart< / span > ) < / span > {
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chart.data.labels.pop();
chart.data.datasets.forEach((dataset) => {
dataset.data.pop();
});
chart.update();
}
< / code > < / pre >
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< 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 >
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< 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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