Chart isn't updating with Response data (Chart.js 3.2.1, ng2-charts 3.0.0-beta.9)

Question

I am using Chart.js of version 3.2.1 and ng2-charts of version 3.0.0-beta.9. I was upgrading a project with this versions. I started with mock data and everything was ok: the charts were showing up as expected.

Until I started testing with the real data, I get from the backend. The axes, labels, legends are not updating and charts are not showing up.

I reproduced the problem here: https://stackblitz.com/edit/chart-js-321-ng2-charts-300-beta9-rest?file=src%2Fapp%2Fapp.component.ts

HTML:

<canvas baseChart 
    [datasets]="barChartData" 
    [labels]="barChartLabels" 
    [options]="barChartOptions" 
    [legend]="barChartLegend" 
    [type]="barChartType">
</canvas>

TS:

    public barChartOptions: ChartOptions = {
        indexAxis: 'y',
        responsive: true,
        scales: {
          x: {
            min: 0
          }
        }
      };
      public barChartLabels: string[] = ['a', 'b', 'c', 'd', 'e', 'f', 'g'];
      public barChartType: ChartType = 'bar';
      public barChartLegend = true;
      public barChartPlugins = [];
      public barChartData: ChartDataset[] = [
        {
          data: [], //comment it out to see that chart loads with mock data below
          // data: [65, 59, 80, 81, 56, 55, 40],
          backgroundColor: 'green',
          label: 'Series A'
        },
        {
          data: [], //comment it out to see that chart loads with mock data below
          // data: [28, 48, 40, 19, 86, 27, 90],
          backgroundColor: 'red',
          label: 'Series B '
        }
      ];
    
      @ViewChild(BaseChartDirective, { static: true }) chart: BaseChartDirective;
ngOnInit() {
    //comment http out to see that chart loads with mock data above
    this.subscription = this.http
      .get('https://api.ratesapi.io/api/2020-05-10')
      .subscribe(data => {
        this.barChartData[0].data = [
          data.rates.GBP,
          data.rates.HKD,
          data.rates.IDR,
          data.rates.PLN,
          data.rates.DKK,
          data.rates.LVL,
          data.rates.INR
        ];
        this.barChartData[1].data = [
          data.rates.CHF,
          data.rates.MXN,
          data.rates.CZK,
          data.rates.SGD,
          data.rates.THB,
          data.rates.BGN,
          data.rates.MYR
        ];
        this.barChartLabels = ['1', '2', '3', '4', '5', '6', '7'];
        this.barChartData[0].label = 'Label1';
        this.chart.update();
      });
  }

Here I'm using the old versions and everything works: https://stackblitz.com/edit/chart-js-293-ng2-charts-232-rest?file=src%2Fapp%2Fapp.component.ts

Answer 1

https://github.com/valor-software/ng2-charts/issues/1313

Instead of chart.update() temporarily use chart.render().

EDIT: in [email protected] this issue is solved. You can use update() or even NO update() method at all.