How to toggle series based on clicked legend in Angular Charts?

Description

This article explains how to dynamically toggle chart series visibility in Angular Charts by interacting with the legend. When a legend item is clicked, only the corresponding series is displayed, hiding the rest. Clicking the same legend again restores the chart to show all series.

Solution

Using the legendClick event, the chart can react to legend interactions by comparing the clicked item’s legendText and toggling the visibility of series accordingly.

Code Snippet

The following example shows how to toggle series based on clicked legend.

app.component.ts

  public previousSelected = null;
  public legendClick(args): void {
       if (this.previousSelected === args.legendText)
       {
           for (let i = 0; i < args.chart.series.length; i++)
           {
               if (args.chart.series[i].name === this.previousSelected)
               {
                   args.chart.series[i].visible = false;
               }
               else
               {
                   args.chart.series[i].visible = true;
               }
           }
           this.previousSelected = null;
       }

       else
       {
           for (let j = 0; j < args.chart.series.length; j++)
           {
               args.chart.series[j].visible = false;
           }
           this.previousSelected = args.legendText;
       }
   }

Output

The following screenshot illustrates the output of the above code snippet

Live Example

View Sample in Stackblitz