Utilizing RxJs operators in Angular: utilizing async pipe and tap does not fill data

Here is a code snippet I've been working on:

This snippet is written in Typescript:

isDataSearch = false;

getDatacollectionByID() {
  const params = {
    id: <some random ID>,
  };
  this.metaData = this.dataService.getDatacollectionByID(params)
    .pipe(
      pluck('level1', 'level2', 'level3'),
      tap(() => this.isDataSearch = true),
      map(metaData => [metaData]), // to be used as an array for ag grid
    )
}

In the HTML template, you'll find:

<ag-grid-angular
    *ngIf="isDataSearch"
    [gridOptions]="dataCollectionConfig"
    [rowData]="metaData | async"
    [modules]="modules"
    class="ag-theme-balham data-collection-grid"
>
</ag-grid-angular>

The goal here is to display the ag-grid only when the observable sequence of data is complete. I first extract the deeply nested data using the pluck method, then reverse the boolean binding with the tap operator.

I understand that this could potentially be achieved by using the subscribe method, but I prefer to avoid it since I'm directly leveraging the async pipe within the template.

Answer №1

If you prefer, you can wait for the observable itself. The async pipe will only return null until the Observable has been resolved.

<ag-grid-angular
    *ngIf="metaData | async as resolvedMetaData"
    [gridOptions]="dataCollectionConfig"
    [rowData]="resolvedMetaData"
    [modules]="modules"
    class="ag-theme-balham data-collection-grid"
>

Answer №2

It is important to note that in this scenario, metaData will not be called because the initial value of isDataSearch is false.

To work around this issue, you can utilize an *ngIf directive to trigger the observable, and then assign the result to a new variable.

<ng-container *ngIf="metaData | async as result">
  <ag-grid-angular    
    [gridOptions]="dataCollectionConfig"
    [rowData]="result"
    [modules]="modules"
    class="ag-theme-balham data-collection-grid"
  >
  </ag-grid-angular>
</ng-container>

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