2020-01-06 21:04:41 +01:00
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<!doctype html>
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<html>
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<head>
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<title>Multi Series Pie Chart</title>
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2020-05-25 22:54:22 +02:00
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<script src="../../dist/chart.js"></script>
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2020-01-06 21:04:41 +01:00
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<script src="../utils.js"></script>
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</head>
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<body>
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<div id="canvas-holder" style="width:40%">
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<canvas id="chart-area"></canvas>
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</div>
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<script>
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var ctx = document.getElementById('chart-area');
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new Chart(ctx, {
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type: 'pie',
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data: {
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labels: [
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'Overall Yay',
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'Overall Nay',
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'Group A Yay',
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'Group A Nay',
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'Group B Yay',
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'Group B Nay',
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'Group C Yay',
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'Group C Nay'
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],
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datasets: [
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{backgroundColor: ['#AAA', '#777'], data: [21, 79]},
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{
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backgroundColor: ['hsl(0, 100%, 60%)', 'hsl(0, 100%, 35%)'],
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data: [33, 67]
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},
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{
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backgroundColor: ['hsl(100, 100%, 60%)', 'hsl(100, 100%, 35%)'],
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data: [20, 80]
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},
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{
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backgroundColor: ['hsl(180, 100%, 60%)', 'hsl(180, 100%, 35%)'],
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data: [10, 90]
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}
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]
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},
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options: {
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2020-11-25 07:50:12 +01:00
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plugins: {
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legend: {
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labels: {
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generateLabels: function(chart) {
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// Get the default label list
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2021-03-06 16:34:52 +01:00
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var original = Chart.overrides.pie.plugins.legend.labels.generateLabels;
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2020-11-25 07:50:12 +01:00
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var labels = original.call(this, chart);
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2020-01-06 21:04:41 +01:00
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2020-11-25 07:50:12 +01:00
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// Build an array of colors used in the datasets of the chart
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var datasetColors = chart.data.datasets.map(function(e) {
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return e.backgroundColor;
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});
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datasetColors = datasetColors.flat();
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2020-01-06 21:04:41 +01:00
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2020-11-25 07:50:12 +01:00
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// Modify the color and hide state of each label
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labels.forEach(label => {
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// There are twice as many labels as there are datasets. This converts the label index into the corresponding dataset index
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label.datasetIndex = (label.index - label.index % 2) / 2;
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2020-01-06 21:04:41 +01:00
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2020-11-25 07:50:12 +01:00
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// The hidden state must match the dataset's hidden state
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label.hidden = !chart.isDatasetVisible(label.datasetIndex);
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2020-01-06 21:04:41 +01:00
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2020-11-25 07:50:12 +01:00
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// Change the color to match the dataset
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label.fillStyle = datasetColors[label.index];
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});
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2020-01-06 21:04:41 +01:00
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2020-11-25 07:50:12 +01:00
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return labels;
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}
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},
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onClick: function(mouseEvent, legendItem, legend) {
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// toggle the visibility of the dataset from what it currently is
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legend.chart.getDatasetMeta(
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legendItem.datasetIndex
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).hidden = legend.chart.isDatasetVisible(legendItem.datasetIndex);
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legend.chart.update();
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2020-01-06 21:04:41 +01:00
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}
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},
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2020-11-25 07:50:12 +01:00
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tooltip: {
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callbacks: {
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label: function(context) {
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var labelIndex = (context.datasetIndex * 2) + context.dataIndex;
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2021-02-05 15:13:32 +01:00
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return context.chart.data.labels[labelIndex] + ': ' + context.formattedValue;
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2020-11-25 07:50:12 +01:00
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}
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2020-01-06 21:04:41 +01:00
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}
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}
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}
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}
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});
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</script>
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</body>
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2020-10-30 23:34:32 +01:00
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</html>
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