Add Indexlabels to last visible dataSeries in Stackedcolumn Chart - CanvasJS JavaScript Chart

Add Indexlabels to last visible dataSeries in Stackedcolumn Chart - CanvasJS JavaScript Chart

by canvasjs

HTML

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<br/><!-- Just so that JSFiddle's Result label doesn't overlap the Chart -->
<div id="chartContainer" style="height: 360px; width: 100%;"></div>

JavaScript

var chart = new CanvasJS.Chart("chartContainer", {
		title: {
				text: "Click on legend items to hide/unhide dataseries"
		},
		legend: {
				cursor: "pointer",
				itemclick: hideUnhideSeries
		},
		data: [{
				showInLegend: true,
				type: "stackedColumn",
				dataPoints: [
						{ x: 10, y: 5 },
						{ x: 20, y: 9 },
						{ x: 30, y: 17 },
						{ x: 40, y: 32 },
						{ x: 50, y: 22 },
						{ x: 60, y: 14 },
						{ x: 70, y: 25 },
						{ x: 80, y: 18 },
						{ x: 90, y: 20 }
				]
				}, 
				{
				showInLegend: true,
				type: "stackedColumn",
				dataPoints: [
						{ x: 10, y: 31 },
						{ x: 20, y: 35 },
						{ x: 30, y: 30 },
						{ x: 40, y: 35 },
						{ x: 50, y: 35 },
						{ x: 60, y: 38 },
						{ x: 70, y: 38 },
						{ x: 80, y: 34 },
						{ x: 90, y: 44 }
				]
				},
				{
				showInLegend: true,
				type: "stackedColumn",            
				dataPoints: [
						{ x: 10, y: 25 },
						{ x: 20, y: 30 },
						{ x: 30, y: 20 },
						{ x: 40, y: 45 },
						{ x: 50, y: 30 },
						{ x: 60, y: 10 },
						{ x: 70, y: 15 },
						{ x: 80, y: 18 },
						{ x: 90, y: 20 }

				]
		}]
});

chart.render();
addIndexLabels(chart);

function hideUnhideSeries(e) {
		if (typeof (e.dataSeries.visible) === "undefined" || e.dataSeries.visible) {
				e.dataSeries.visible = false;
		} else {
				e.dataSeries.visible = true;
		}      
		e.chart.render();
		addIndexLabels(e.chart);
}

function addIndexLabels(chart){
		var lastVisibleDsIndex;
		var i = chart.data.length - 1;
		while(i >= 0) {
				if(chart.data[i].visible){
						lastVisibleDsIndex = i;
						break;
				}
				else{
						i--;
				}
		}
		if(lastVisibleDsIndex < chart.data.length){
				for(var j = 0; j < chart.data.length; j++)
						chart.options.data[j].indexLabel = "";
				
				chart.options.data[lastVisibleDsIndex].indexLabel = "#total";
				chart.render();
		}
}