The @ViewChild in Angular 2 seems to be unable to detect the BaseChartDirective from the ng2-charts

I'm currently using ng2-charts v1.5.0 and I'm facing an issue with updating the chart data after a click event. Despite following suggestions from other sources, I am unable to get it to work properly.

Here is a snippet of my code:

<div style="display: block">

  <canvas #chart baseChart
              [data]="dChartData"
              [labels]="dChartLabels"
              [chartType]="dChartType"
              (chartClick)="chartClicked($event)">
  </canvas>

</div>

When I try to access the BaseChartDirective using @ViewChild, I encounter this error message:

__zone_symbol__error : Error: Can't construct a query for the property "chart" of "ChartTest1WidgetComponent" since the query selector wasn't defined.

Even when I attempt to use @ViewChild with the name 'chart', calling this.chart.ngOnChanges({}); results in the error 

_this.chart.ngOnChanges is not a function
. This behavior is quite confusing to me. How can I correctly reference the view child as a BaseChartDirective?

javascriptangulartypescriptng2-charts

Answer №1

After some trial and error, I found a solution that worked perfectly for me: 

@ViewChild(BaseChartDirective) private Chart: BaseChartDirective;
and then 
this.Chart.forceUpdate({} as SimpleChanges)
.

An even easier method that yielded great results was to directly update the dChartData variable with the new data, which automatically refreshed the chart. This approach proved to be more efficient than relying on ngOnChanges. I hope this advice proves helpful!

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