Requests as Promises

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The observable returned by Angular http client can be converted it into a promise.
We recommend using observables over promises. By converting to a promise you will be lose the ability to cancel a request and the ability to chain RxJS operators.
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import { HttpClient } from '@angular/http/common';
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import { Injectable } from '@angular/core';
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import { map } from 'rxjs/operators';
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​
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@Injectable()
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export class SearchService {
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​
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  constructor(private http: HttpClient) {}
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​
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  search(term: string) {
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    return this.http.pipe(
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      get(`https://api.spotify.com/v1/search?q=${term}&type=artist`),
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      map((response) => response.json())
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    ).toPromise();
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  }
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}
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We would then consume it as a regular promise in the component.
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@Component({ /* ... */ })
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export class AppComponent {
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    /* ... */
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​
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    search() {
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        this.searchService.search(this.searchField.value)
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          .then((result) => {
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        this.result = result.artists.items;
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      })
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      .catch((error) => console.error(error));
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    }
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}
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Enhancing Search with switchMap

Change Detection

Last modified 3mo ago

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