Chart.types.Pie.extend({
name: "PieUnique",
addData: function (segment, atIndex, silent) {
var index = atIndex || this.segments.length;
this.segments.splice(index, 0, new this.SegmentArc({
value: segment.value,
outerRadius: (this.options.animateScale) ? 0 : this.outerRadius,
innerRadius: (this.options.animateScale) ? 0 : (this.outerRadius / 100) * this.options.percentageInnerCutout,
fillColor: segment.color,
highlightColor: segment.highlight || segment.color,
showStroke: this.options.segmentShowStroke,
strokeWidth: this.options.segmentStrokeWidth,
strokeColor: this.options.segmentStrokeColor,
startAngle: Math.PI * this.options.startAngle,
circumference: (this.options.animateRotate) ? 0 : this.calculateCircumference(segment.value),
label: segment.label,
//add option passed
id: segment.id
}));
if (!silent) {
this.reflow();
this.update();
}
},
});
var pieData = [{
value: 300,
color: "#F7464A",
highlight: "#FF5A5E",
label: "Red",
id: "1-upi"
}, {
value: 50,
color: "#46BFBD",
highlight: "#5AD3D1",
label: "Green",
id: "2-upi"
}, {
value: 100,
color: "#FDB45C",
highlight: "#FFC870",
label: "Yellow",
id: "3-upi"
}, {
value: 40,
color: "#949FB1",
highlight: "#A8B3C5",
label: "Grey",
id: "4-upi"
}, {
value: 120,
color: "#4D5360",
highlight: "#616774",
label: "Dark Grey",
id: "5-upi"
}
];
var ctx = document.getElementById("chart-area").getContext("2d");
window.myPie = new Chart(ctx).PieUnique(pieData);
document.getElementById("chart-area").onclick = function (evt) {
var activePoints = window.myPie.getSegmentsAtEvent(evt);
//you can now access the id at activePoints[0].id
console.log(activePoints);
};
<script src="https://raw.githack.com/leighquince/Chart.js/master/Chart.js"></script>
<canvas id="chart-area" width="400"></canvas>