How to return data coming from response instead of subscription json in Angular 2/4

Question

My Service :

fetchData(url,request)
  {
    return this.http.post(this.apiUrl+url,request).subscribe(
        (response) => {return response.json()}
    );
  }

My Component :

ngOnInit()
    {
        this.response = this.dataService.fetchData('friends/grow_network',{});
        console.log('s ',this.response);
    }

if I console response.json() in service it shows proper data which is coming from api but if I console in component it shows like this :

Subscriber {closed: false, _parent: null, _parents: null, _subscriptions: Array(1), syncErrorValue: null…}

how to get data in component which is coming from api not Subscriber data ?

Answer 1

You can using Observables in angular . and please checkout this below discussion

Angular - Promise vs Observable

---

Now try this below code instead of your code in component

 this.response = this.dataService.fetchData ('friends/grow_network'{})
                 .subscribe(res=> { console.log(res);
                 }), error => alert(error);

and you service code should be

fetchData(url,request)
  {
    return this.http.post(this.apiUrl+url,request).map(
        (response) => {return response.json()}
    );
  }

Answer 2

When doing it your way, you write in the variable "reponse" the observable object and not the result. The value of the result is not there yet when calling the method, because it will be asynchronous.

To get what you want you have to do the following:

fetchData(url,request)
  {
    return this.http.post(this.apiUrl+url,request).map(
        (response) => {return response.json()}
    );
  }

ngOnInit()
    {
        this.response = this.dataService.fetchData('friends/grow_network',{})
                         .subscribe(result => {
                           this.response = result;
                           console.log('s ',this.response);
                         });

    }