Angular 4 Http Chain请求

Question

I'm having trouble figuring out how to use the result of an Http request to make another Http request. Let's make it clear with example; Firstly I getting data from this api:

[{"id": 1}]

Secondly I should getting data from another api and result is :

[{"id": 1, "name": "id labore ex et quam laborum", }]

So I should check api İf first data id =1 then I should post "id labore ex et quam laborum" . I'm open with any advice. Thank you

Answer 1

You could use the rxjs switchMap operator.

Just import it:

import 'rxjs/add/operator/switchMap';

And then use it like this:

this.http.get('/api/items').switchMap(data => {
  // do something with your data
  return this.http.get(`https://api.com/${data.id}`); // use it for example in your http request
}).subscribe(data => {
    this.results = data['results'];
});

You can find more about it here .