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Server: Windows NT AKFAR_SERVER 10.0 build 26200 (Windows 10) AMD64 Path: D:/BACKUP C 19-12/XAMPP74/htdocs/pmb/chartjs/samples/advanced/ [ Home ]
File: data-labelling.html
<!doctype html>
<html>

<head>
	<title>Labelling Data Points</title>
	<script src="../../Chart.bundle.js"></script>
	<script src="../utils.js"></script>
	<style>
		canvas {
			-moz-user-select: none;
			-webkit-user-select: none;
			-ms-user-select: none;
		}
	</style>
</head>

<body>
	<div style="width: 75%">
		<canvas id="canvas"></canvas>
	</div>
	<button id="randomizeData">Randomize Data</button>
	<script>
		var color = Chart.helpers.color;
		var barChartData = {
			labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
			datasets: [{
				type: 'bar',
				label: 'Dataset 1',
				backgroundColor: color(window.chartColors.red).alpha(0.2).rgbString(),
				borderColor: window.chartColors.red,
				data: [
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor()
				]
			}, {
				type: 'line',
				label: 'Dataset 2',
				backgroundColor: color(window.chartColors.blue).alpha(0.2).rgbString(),
				borderColor: window.chartColors.blue,
				data: [
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor()
				]
			}, {
				type: 'bar',
				label: 'Dataset 3',
				backgroundColor: color(window.chartColors.green).alpha(0.2).rgbString(),
				borderColor: window.chartColors.green,
				data: [
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor(),
					randomScalingFactor()
				]
			}]
		};

		// Define a plugin to provide data labels
		Chart.plugins.register({
			afterDatasetsDraw: function(chart) {
				var ctx = chart.ctx;

				chart.data.datasets.forEach(function(dataset, i) {
					var meta = chart.getDatasetMeta(i);
					if (!meta.hidden) {
						meta.data.forEach(function(element, index) {
							// Draw the text in black, with the specified font
							ctx.fillStyle = 'rgb(0, 0, 0)';

							var fontSize = 16;
							var fontStyle = 'normal';
							var fontFamily = 'Helvetica Neue';
							ctx.font = Chart.helpers.fontString(fontSize, fontStyle, fontFamily);

							// Just naively convert to string for now
							var dataString = dataset.data[index].toString();

							// Make sure alignment settings are correct
							ctx.textAlign = 'center';
							ctx.textBaseline = 'middle';

							var padding = 5;
							var position = element.tooltipPosition();
							ctx.fillText(dataString, position.x, position.y - (fontSize / 2) - padding);
						});
					}
				});
			}
		});

		window.onload = function() {
			var ctx = document.getElementById('canvas').getContext('2d');
			window.myBar = new Chart(ctx, {
				type: 'bar',
				data: barChartData,
				options: {
					responsive: true,
					title: {
						display: true,
						text: 'Chart.js Combo Bar Line Chart'
					},
				}
			});
		};

		document.getElementById('randomizeData').addEventListener('click', function() {
			barChartData.datasets.forEach(function(dataset) {
				dataset.data = dataset.data.map(function() {
					return randomScalingFactor();
				});
			});
			window.myBar.update();
		});
	</script>
</body>

</html>