Angular does not update the progress bar

Imagine having a component html with your own customized round progress bar

 <round-progress #progress
    [current]="current"
</round-progress>

The "Current" value represents the percentage. In my TypeScript component, I have written:

this.percentageSubscription = this.percentageService.percentage$.subscribe((percentage) => {
     this.current = this.current + percentage;
     console.log(this.current);
});

When I print the value, it shows the correct increment based on another algorithm. The console.log displays the accurate increase, but for some reason, the progress bar does not reflect this change.

Seeking assistance from someone who can help resolve this issue.

javascriptangulartypescriptprogress-barangular6

Answer №1

When the value updates correctly in your subscription but not in your template, it causes the change detection to fail in registering the new value. Manually triggering change detection is an option, but it's not recommended.

Instead, I recommend using the async pipe and rewriting your usage as follows:

<round-progress #progress
    [current]="current$ | async"
</round-progress>

Also, update your code snippet like this:

this.current$ = this.percentageService.percentage$.pipe(
  scan((acc = 0, percentage) => acc + percentage)    
);

By following this approach, you no longer have to manually manage your subscriptions. If you need the "current" value locally for other purposes, you can either share the observable (and handle subscriptions again) or use a tap operator to set a local value.

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