How to Add a Header to the Tooltip in Angular Stacked Bar Chart?

To display a custom header in the tooltip of a Stacked Bar Angular Chart, use the sharedTooltipRender event of the ejs-chart component. This event is triggered just before the shared tooltip is rendered, allowing you to modify its content.

In the example below, the sharedTooltipRender method calculates the sum of all Y-values from the stacked series at the hovered x-axis point and sets it as the tooltip header using args.headerText.

Code Example

app.component.html

<ejs-chart style='display:block;' (sharedTooltipRender)='sharedTooltipRender($event)'>...
       </ejs-chart> 

app.component.ts

public sharedTooltipRender(args) {
       let sum =0 ;
       for (let i = 0; i < args.data.length; i++) {
       sum = sum + args.data[i].pointY;
       }
     args.headerText= 'Total' + ' ' + sum.toString();
   } 

Output

Live Sample

StackBlitz Sample

Conclusion

I hope you enjoyed learning about how to add a header to the tooltip in Angular Stacked Bar Chart.

You can refer to our Angular Chart’s feature tour page to learn about its other groundbreaking feature representations. You can also explore our Angular Chart Documentation to understand how to present and manipulate data.

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