With loading pipe long living stream #tags: Angular
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| <h2 class="title">Products</h2> | |
| <div class="search-bar"> | |
| <input (input)="searchStream$.next($event.target.value)"> | |
| </div> | |
| <div class="results"> | |
| <h3>Built-in solution</h3> | |
| <div *ngIf="obs$ | async as obs"> | |
| <ng-template [ngIf]="obs.type === 'finish'"> | |
| {{obs.value}} | |
| </ng-template> | |
| <ng-template [ngIf]="obs.type === 'start'">Loading...</ng-template> | |
| </div> | |
| <h3>WithLoadingPipe</h3> | |
| <div *ngIf="obs$ | withLoading | async as obs"> | |
| <ng-template [ngIf]="obs.value">{{ obs.value }} | |
| </ng-template> | |
| <ng-template [ngIf]="obs.loading">Loading...</ng-template> | |
| </div> | |
| </div> |
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| import { Pipe, PipeTransform } from '@angular/core'; | |
| import { isObservable, of } from 'rxjs'; | |
| import { map, startWith, catchError } from 'rxjs/operators'; | |
| @Pipe({ | |
| name: 'withLoading', | |
| }) | |
| export class WithLoadingPipe implements PipeTransform { | |
| transform(val) { | |
| return isObservable(val) | |
| ? val.pipe( | |
| map((value: any) => ({ | |
| loading: value.type === 'start', | |
| value: value.type ? value.value : value | |
| })), | |
| startWith({ loading: true }), | |
| catchError(error => of({ loading: false, error })) | |
| ) | |
| : val; | |
| } | |
| } | |
| /*obs$ = this.searchStream$.pipe( | |
| debounceTime(200), | |
| distinctUntilChanged(), | |
| switchMap((query) => | |
| concat( | |
| // emit { type: 'start' } immediately | |
| of({ type: 'start'}), | |
| this.productsService.getByFilter(query) | |
| // map to the wrapped object with type finish | |
| .pipe(map(value => ({ type: 'finish', value }))) | |
| }) | |
| );*/ |
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