How to apply bold styling in shared tooltip for Angular Charts?

This article demonstrates how to apply partially bold text in shared tooltips using the Angular Chart component.

Apply partial bold styling in shared tooltip

To render a shared tooltip with partially bold text, you can use the sharedTooltipRender event and customize the tooltip content dynamically.

In the example below, the date is formatted using a custom formatDate method. The tooltip text is modified within the sharedTooltipRender event to apply bold styling only to the series name (args.series[i].name) and the Y-value (args.data[i].pointY) of each data point.

index.html

<ejs-chart  [primaryXAxis]='primaryXAxis' [primaryYAxis]='primaryYAxis'
           [tooltip]='tooltip' (load)='load($event)' (sharedTooltipRender)='sharedTooltipRender($event)'
           [chartArea]='chartArea' [width]='width' [legendSettings]='legend'>

app.component.ts

export class AppComponent {

  public formatDate(date) {
       const options: Intl.DateTimeFormatOptions = {
         year: 'numeric',
         month: '2-digit',
         day: '2-digit',
         hour: '2-digit',
         minute: '2-digit',
         second: '2-digit',
         hour12: true,
       };
     
       const formattedDate = new Intl.DateTimeFormat('en-US', options).format(date);
       return formattedDate;
   }
   public sharedTooltipRender(args) {
       for (let i = 0; i < args.point.length; i++) {
           const formattedDate = this.formatDate(args.data[i].pointX as Date);
           args.text[i] =
             '<b>' +
             '   ' +
             args.series[i].name +
             ' ' +
             args.data[i].pointY +
             ' ' +
             '</b> ' +
             ',' +
             formattedDate;
         }
   }
} 

Output

Sample

View Sample in Stackblitz

Conclusion

I hope you enjoyed learning about how to apply bold styling in shared tooltip for Angular Charts.

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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