pie.html
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<!doctype html>
<html>
<head>
<title>Pie Chart</title>
<script src="../dist/Chart.bundle.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</head>
<body>
<div id="canvas-holder" style="width:50%">
<canvas id="chart-area" width="300" height="300" />
</div>
<button id="randomizeData">Randomize Data</button>
<button id="addDataset">Add Dataset</button>
<button id="removeDataset">Remove Dataset</button>
<script>
var randomScalingFactor = function() {
return Math.round(Math.random() * 100);
};
var randomColorFactor = function() {
return Math.round(Math.random() * 255);
};
var randomColor = function(opacity) {
return 'rgba(' + randomColorFactor() + ',' + randomColorFactor() + ',' + randomColorFactor() + ',' + (opacity || '.3') + ')';
};
var config = {
type: 'pie',
data: {
datasets: [{
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
],
backgroundColor: [
"#F7464A",
"#46BFBD",
"#FDB45C",
"#949FB1",
"#4D5360",
],
}, {
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
],
backgroundColor: [
"#F7464A",
"#46BFBD",
"#FDB45C",
"#949FB1",
"#4D5360",
],
}, {
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
],
backgroundColor: [
"#F7464A",
"#46BFBD",
"#FDB45C",
"#949FB1",
"#4D5360",
],
}],
labels: [
"Red",
"Green",
"Yellow",
"Grey",
"Dark Grey"
]
},
options: {
responsive: true
}
};
window.onload = function() {
var ctx = document.getElementById("chart-area").getContext("2d");
window.myPie = new Chart(ctx, config);
};
$('#randomizeData').click(function() {
$.each(config.data.datasets, function(i, piece) {
$.each(piece.data, function(j, value) {
config.data.datasets[i].data[j] = randomScalingFactor();
config.data.datasets[i].backgroundColor[j] = randomColor(0.7);
});
});
window.myPie.update();
});
$('#addDataset').click(function() {
var newDataset = {
backgroundColor: [randomColor(0.7), randomColor(0.7), randomColor(0.7), randomColor(0.7), randomColor(0.7)],
data: [randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor()]
};
config.data.datasets.push(newDataset);
window.myPie.update();
});
$('#removeDataset').click(function() {
config.data.datasets.splice(0, 1);
window.myPie.update();
});
</script>
</body>
</html>