Chartjs-Using a function in ng2 Charts

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You should define the onHover callback function as follows:

onHover: () => this.changeFontColor(),

The changeFontColor method would also have to be changed. Please note that I reassign lineChartOptions with a copy of itself to make Angular change detection work.

changeFontColor(): void {
  this.lineChartOptions.legend.labels.fontColor = "red";
  this.lineChartOptions = JSON.parse(JSON.stringify(this.lineChartOptions));
};

Please take a look at your amended StackBlitz.

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