Angular Observables - related endpoints-CodePudding

I have endpoint, which returns an endpoint url.

http://example.com/get-endpoint

I want to invoke first GET and then using the result url invoke the second GET. How can I achieve this using chained observables and RxJS? I don't know how to pass url of the first GET to the second GET

CodePudding user response：

You may use flatMap:

this.http.get('http://example.com/get-endpoint')
    .pipe(
        flatMap(endpoint => this.service.getObservable(result))
     )
    .subscribe(result => console.log(result));

Take a look at the documentation here

CodePudding user response：

Use RxJS's switchMap operator.

// your service...
getData(){
  return this.httpClient.get('http://example.com/get-endpoint', { responseType: "text"}).pipe(
    switchMap(url => this.httpClient.get(url))
  );
}

If your endpoint does not return a string but JSON, you should remove the { responseType: "text"} option object, and pass the right property to the inner this.httpClient.get call.