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Legend Customization in React Chart component

01 Jul 2022 / 2 minutes to read

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.

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index.jsx
index.tsx
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import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, Legend, Category, Tooltip, DataLabel, StepAreaSeries } from '@syncfusion/ej2-react-charts';
class App extends React.Component {
    constructor() {
        super(...arguments);
        this.data = [
            { 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 }
        ];
        this.data1 = [
            { 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 }
        ];
        this.legendRender = (args) => {
            if (args.text === 'Renewable') {
                args.shape = 'Circle';
            }
            else if (args.text === 'Non-Renewable') {
                args.shape = 'Triangle';
            }
        };
        this.primaryxAxis = { valueType: 'Double' };
        this.primaryyAxis = { valueType: 'Double' };
    }
    render() {
        return <ChartComponent id='charts' primaryXAxis={this.primaryxAxis} primaryYAxis={this.primaryyAxis} title='FB Penetration of Internet Audience' legendRender={this.legendRender}>
      <Inject services={[StepAreaSeries, Legend, Tooltip, DataLabel, Category]}/>
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={this.data} type='StepArea' xName='x' yName='y' width={2} name='Renewable'>
        </SeriesDirective>
        <SeriesDirective dataSource={this.data1} type='StepArea' xName='x' yName='y' width={2} name='Non-Renewable'>
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>;
    }
}
;
ReactDOM.render(<App />, document.getElementById("charts"));
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import * as React from "react";
import * as ReactDOM from "react-dom";
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, AxisModel,
         Legend,  Category, Tooltip, DataLabel, StepAreaSeries , ILegendRenderEventArgs }
from'@syncfusion/ej2-react-charts';
import { EmitType} from '@syncfusion/ej2-base';

class App extends React.Component<{}, {}> {

  public data: any[] = [
    { 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 }
  ];
  public data1: any[] = [
    { 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 }
  ];
  public legendRender: EmitType<ILegendRenderEventArgs> = (args: ILegendRenderEventArgs): void => {
    if (args.text === 'Renewable') {
      args.shape = 'Circle';
    } else if (args.text === 'Non-Renewable') {
      args.shape = 'Triangle';
    }
  };
  public primaryxAxis: AxisModel = { valueType: 'Double' };
  public primaryyAxis: AxisModel = { valueType: 'Double' };

  render() {
    return <ChartComponent id='charts'
      primaryXAxis={this.primaryxAxis}
      primaryYAxis={this.primaryyAxis}
      title='FB Penetration of Internet Audience'
      legendRender={this.legendRender}>
      <Inject services={[StepAreaSeries, Legend, Tooltip, DataLabel, Category]} />
      <SeriesCollectionDirective>
        <SeriesDirective dataSource={this.data} type='StepArea' xName='x' yName='y' width={2} name='Renewable'>
        </SeriesDirective>
        <SeriesDirective dataSource={this.data1} type='StepArea' xName='x' yName='y' width={2} name='Non-Renewable' >
        </SeriesDirective>
      </SeriesCollectionDirective>
    </ChartComponent>
  }

};
ReactDOM.render(<App />, document.getElementById("charts"));
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