How to make a marker visible for a specific point in the React Chart?

This article explains how to show a marker for a specific point in the React Chart.

Customize the way a marker is displayed for a specific point

You can render a marker for a specific point by using the pointRender event and set the height and width of the marker to 0 for the remaining points.

In the following code example, the marker will be rendered only at the fourth data point.

Index.js

import { createRoot } from 'react-dom/client';
import * as React from 'react';
import { ChartComponent, SeriesCollectionDirective, SeriesDirective, Inject, LineSeries
      } from '@syncfusion/ej2-react-charts';

const Line = () => {
 const pointRender = (args) => {
   if (!(args.point.index == 3)) {
     args.height = 0;
     args.width = 0;
   }
 };
 return (
       <chartcomponent id="charts" primaryxaxis="{{" valuetype:="" 'double'="" }}="" primaryyaxis="{{" minimum:="" 0,="" maximum:="" 20,="" interval:="" 4="" pointrender="{pointRender.bind(this)}">
         <inject services="{[LineSeries]}">
         <seriescollectiondirective>
           <seriesdirective datasource="{data}" xname="x" yname="y" marker="{{" visible:="" true,="" width:="" 7,="" height:="" 7="" }}="" type="Line"></seriesdirective>
         </seriescollectiondirective>
       </inject></chartcomponent>
    );
};
export default Line;

const root = createRoot(document.getElementById('sample'));
root.render(<line>);

The following screenshot portrays the results of the code snippet mentioned above.

Screenshot:

Refer to the working sample for additional details and implementation: View Sample in Stackblitz

Conclusion

We hope you enjoyed learning how to show a marker for a specific point in the React Chart Component.

You can refer to our React Chart feature tour page to learn about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our React Chart example to understand how to create and manipulate data.

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.

If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, BoldDesk Support, or feedback portal. We are always happy to assist you!