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Pie Percentage in JavaScript Chart control

By using the tooltipRender event, you can show the percentage value for each point of pie series in tooltip.

To show the percentage value in pie tooltip, follow the given steps:

Step 1:

By using the tooltipRender event, you can get the args.point.y and args.series.sumOfPoints values. You can use these values to calculate the percentage value for each point of pie series. To display the percentage value in tooltip, use the args.content property.

Source
Preview
index.ts
index.html
import {
    AccumulationTheme, AccumulationChart, AccumulationLegend, PieSeries, AccumulationTooltip, IAccTooltipRenderEventArgs,
    AccumulationDataLabel
} from '@syncfusion/ej2-charts';
AccumulationChart.Inject(AccumulationLegend, PieSeries, AccumulationTooltip, AccumulationDataLabel);
let pie: AccumulationChart = new AccumulationChart({
        // Initialize the chart series
    series: [
            {
                dataSource: [
                    { 'x': 'Chrome', y: 37 }, { 'x': 'UC Browser', y: 17 },
                    { 'x': 'iPhone', y: 19 }, { 'x': 'Others', y: 4, text: '4%' }, { 'x': 'Opera', y: 11 }
                ],
                dataLabel:{
                  visible:true
                },
                radius: '70%', xName: 'x',
                yName: 'y', startAngle: 0,
                endAngle: 360, innerRadius: '0%'
            }
        ],
        enableSmartLabels: true,
        legendSettings: {
            visible: false,
        },
        // Initialize tht tooltip
        tooltip: { enable: true },
        title: 'Mobile Browser Statistics',
         tooltipRender: (args: IAccTooltipRenderEventArgs) => {
           let value  = args.point.y / args.series.sumOfPoints * 100;
           args.text = args.point.x + '' + Math.ceil(value) + '' + '%';
        },
        width:'650px',
        height: '350px'
    });
    pie.appendTo('#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="http://npmci.syncfusion.com/packages/development/material.css" rel="stylesheet">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div class="col-sm-8">
            <div class="row">
                <div class="col-sm-4">  
                  <div id='container'>
                    <div id='element'  style="width:350px; height:350px;float:left">
                    </div>
                    <label id="lbl"></label>
                  </div>
                </div>
                <div class="col-sm-4" style="width:200px; height:350px;float: right">
                  <div id='Grid'>
                  </div>
                </div>
            </div>
    </div>
</body> 
</html>