angular2 rxjs observable forkjoin

Question

Is it possible to continue forkjoin http.get requests even if one of the requests fails.

I\'m looking to a similar function of $q.allSettled in angular2.

Se

Answer 1

You could leverage the catch operator for each observable to intercept the error and return another observable in such cases.

Here is a sample:

return Observable.forkJoin(
  this.http.get('/some-url')
         .map((res:Response) => res.json())
         .catch(res:Response => Observable.of({}),
  this.http.get('/some-other-url')
         .map((res:Response) => res.json())
         .catch(res:Response => Observable.of({}),
);

Answer 2

Uses Observable.forkJoin() to run multiple concurrent http.get() requests. The entire operation will result in an error state if any single request fails.

 getBooksAndMovies() {
    return Observable.forkJoin(
      this.http.get('/app/books.json').map((res:Response) => res.json()),
      this.http.get('/app/movies.json').map((res:Response) => res.json())
    );

But you could put your additional GET request in the error handler:

getBooksAndMovies() {
    Observable.forkJoin(
        this.http.get('/app/books.json').map((res:Response) => res.json()),
        this.http.get('/app/movies.json').map((res:Response) => res.json())
    ).subscribe(
      data => {
        this.books = data[0]
        this.movies = data[1]
      },
      err => console.error(err)
    );