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<!doctype html>
<html>
<head>
<title>Tooltip Hooks</title>
<script src="../../dist/Chart.min.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>
<script>
var config = {
type: 'line',
data: {
labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
datasets: [{
label: 'My First dataset',
borderColor: window.chartColors.red,
backgroundColor: window.chartColors.red,
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor()
],
fill: false,
}, {
label: 'My Second dataset',
borderColor: window.chartColors.blue,
backgroundColor: window.chartColors.blue,
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor()
],
fill: false,
}]
},
options: {
responsive: true,
title: {
display: true,
text: 'Chart.js Line Chart - Custom Information in Tooltip'
},
tooltips: {
mode: 'index',
callbacks: {
// Use the footer callback to display the sum of the items showing in the tooltip
footer: function(tooltipItems, data) {
var sum = 0;
tooltipItems.forEach(function(tooltipItem) {
sum += data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
});
return 'Sum: ' + sum;
},
},
footerFontStyle: 'normal'
},
hover: {
mode: 'index',
intersect: true
},
scales: {
xAxes: [{
display: true,
scaleLabel: {
show: true,
labelString: 'Month'
}
}],
yAxes: [{
display: true,
scaleLabel: {
show: true,
labelString: 'Value'
}
}]
}
}
};
window.onload = function() {
var ctx = document.getElementById('canvas').getContext('2d');
window.myLine = new Chart(ctx, config);
};
</script>
</body>
</html>