Angular Fusion: Delay execution of ngAfterViewInit until data is received from API call in ngOnInit

I'm facing an issue with my code where the API call in ngOnInit is not waiting for the data to be returned before moving on to ngAfterViewInit. I need it to wait because I am performing operations on that data in ngAfterViewInit, but currently, it's causing issues with my Dto being undefined. Any suggestions on how to ensure that the data is loaded and processed before proceeding?

this.subscriptions.add(
    this.gridService
      .GetGridByName(
        this.gridName,
        '1.0'
      )
      .subscribe({
        next: (data: any) => {
          if (data.result) {
            // The code should wait for the DTO to load before moving to ngAfterViewInit
            this.gridDto = data.result;
          }
        },
typescriptangular15

Answer №1

Utilize the observable that you already have and remain in the realm of observables until there is a desired side effect.

gridDto$: Onservable<any>;

ngOnInit() {
  ...
  this.gridDto$ = this.gridService.GetGridByName(
    this.gridName,          
    '1.0'
  )
  .pipe(
    map(data => data?.result),
    // if nothing returned, don't emit anything.
    filter(result => !!result),
    // don't repeat instructions per listener
    shareReplay(1)
  );
}

If your grid component accepts observables, provide it with gridDto$. Otherwise, update gridDto in your template to gridDto | async so Angular recognizes it as an observable.

Having obtained the data as an observable, you can now pipe or subscribe to it in your ngAfterViewInit script.

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