mirror of
https://github.com/chartjs/Chart.js.git
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133 lines
4.7 KiB
HTML
133 lines
4.7 KiB
HTML
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<!doctype html>
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<html>
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<head>
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<title>Labelling Data Points</title>
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<script src="../dist/Chart.bundle.js"></script>
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<script src="utils.js"></script>
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<style>
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canvas {
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-moz-user-select: none;
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-webkit-user-select: none;
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-ms-user-select: none;
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}
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</style>
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</head>
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<body>
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<div style="width: 75%">
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<canvas id="canvas"></canvas>
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</div>
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<button id="randomizeData">Randomize Data</button>
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<script>
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var color = Chart.helpers.color;
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var barChartData = {
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labels: ["January", "February", "March", "April", "May", "June", "July"],
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datasets: [{
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type: 'bar',
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label: 'Dataset 1',
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backgroundColor: color(window.chartColors.red).alpha(0.2).rgbString(),
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borderColor: window.chartColors.red,
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data: [
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor()
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]
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}, {
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type: 'line',
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label: 'Dataset 2',
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backgroundColor: color(window.chartColors.blue).alpha(0.2).rgbString(),
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borderColor: window.chartColors.blue,
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data: [
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor()
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]
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}, {
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type: 'bar',
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label: 'Dataset 3',
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backgroundColor: color(window.chartColors.green).alpha(0.2).rgbString(),
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borderColor: window.chartColors.green,
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data: [
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor(),
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randomScalingFactor()
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]
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}]
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};
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// Define a plugin to provide data labels
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Chart.plugins.register({
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afterDatasetsDraw: function(chartInstance, easing) {
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// To only draw at the end of animation, check for easing === 1
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var ctx = chartInstance.chart.ctx;
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chartInstance.data.datasets.forEach(function (dataset, i) {
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var meta = chartInstance.getDatasetMeta(i);
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if (!meta.hidden) {
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meta.data.forEach(function(element, index) {
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// Draw the text in black, with the specified font
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ctx.fillStyle = 'rgb(0, 0, 0)';
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var fontSize = 16;
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var fontStyle = 'normal';
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var fontFamily = 'Helvetica Neue';
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ctx.font = Chart.helpers.fontString(fontSize, fontStyle, fontFamily);
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// Just naively convert to string for now
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var dataString = dataset.data[index].toString();
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// Make sure alignment settings are correct
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ctx.textAlign = 'center';
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ctx.textBaseline = 'middle';
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var padding = 5;
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var position = element.tooltipPosition();
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ctx.fillText(dataString, position.x, position.y - (fontSize / 2) - padding);
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});
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}
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});
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}
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});
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window.onload = function() {
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var ctx = document.getElementById("canvas").getContext("2d");
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window.myBar = new Chart(ctx, {
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type: 'bar',
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data: barChartData,
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options: {
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responsive: true,
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title: {
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display: true,
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text: 'Chart.js Combo Bar Line Chart'
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},
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}
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});
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};
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document.getElementById('randomizeData').addEventListener('click', function() {
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barChartData.datasets.forEach(function(dataset) {
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dataset.data = dataset.data.map(function() {
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return randomScalingFactor();
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})
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});
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window.myBar.update();
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});
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</script>
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</body>
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</html>
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