The disappearance of ngx-charts lines is observed when the chart is rendered within a PrimeNG dialog that gets closed and reopened

In my TypeScript Angular application, I am currently incorporating PrimeNG. Specifically, I am utilizing the dialog component from PrimeNG to display charts using ngx-charts, specifically the ngx-charts-line-chart module. Initially, when I open the dialog, the chart appears perfectly fine. However, upon closing and reopening the dialog, the lines on the chart disappear without any error messages being displayed. Even though the lines are missing, I can still hover over the chart and see the points via tooltips. One possible explanation for this issue could be that when the dialog is closed, it undergoes resizing which may be causing some unexpected behavior in ngx-charts.

javascriptangulartypescriptprimengngx-charts

Answer №1

After some experimentation, I discovered a solution to this issue. By utilizing the onHide property of the dialog component, I was able to clear the chart data by setting it to an empty array and then easily resetting the data when re-opening the dialog.

To implement this in your component HTML, include the following:

<p-dialog (onHide)="onHide()">-chart stuff here-</p-dialog>

Next, in your component's TypeScript file, add the onHide function like so:

onHide(){ let o = [] as any; this.chartData = [...o]}

This approach seems necessary because when the dialog is minimized, the chart resizes based on the smaller size, causing issues with the lines on the chart. However, by clearing the data, the chart avoids attempting to draw lines when minimized.

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