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Legend Customization in JavaScript Chart control

By using the legendRender, you can customize the legend shape.

To Customize the legend shape, follow the given steps:

Step 1:

Set the shape value for each legend using args.shape in legendRender event.

Source
Preview
index.ts
index.html
import { Chart, StepAreaSeries, Legend, ILoadedEventArgs, ILegendRenderEventArgs } from '@syncfusion/ej2-charts';
Chart.Inject(StepAreaSeries, Legend);
    let chart: Chart = new Chart({
      //Initializing Primary X Axis
        primaryXAxis: {
            valueType: 'Double',
        },
        //Initializing Primary Y Axis
        primaryYAxis:
        {
            title: 'Production (Billion as kWh)',
            valueType: 'Double'
        },
        //Initializing Chart Series
        series: [
            {
                type: 'StepArea',
                dataSource: [{ x: 2000, y: 416 }, { x: 2001, y: 490 }, { x: 2002, y: 470 }, { x: 2003, y: 500 },
                { x: 2004, y: 449 }, { x: 2005, y: 470 }, { x: 2006, y: 437 }, { x: 2007, y: 458 }],
                name: 'Renewable',
                xName: 'x', width: 2,
                yName: 'y',
            },
            {
                type: 'StepArea',
                dataSource: [{ x: 2000, y: 180 }, { x: 2001, y: 240 }, { x: 2002, y: 370 }, { x: 2003, y: 200 },
                { x: 2004, y: 229 }, { x: 2005, y: 210 }, { x: 2006, y: 337 }, { x: 2007, y: 258 }],
                name: 'Non-Renewable',
                xName: 'x', width: 2,
                yName: 'y',
            },
        ],
        //Initializing Chart title
    title: 'Electricity- Production',
    legendRender: (args: ILegendRenderEventArgs)=> {
    if (args.text === 'Renewable') {
    args.shape = 'Circle';
    } else if (args.text === 'Non-Renewable') {
    args.shape = 'Triangle';
    }
    },
    width:'650px',
    height: '350px'
    });
    chart.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>