Issue with handling data from web api in Angular 6

Question

Issue with handling data from web api in Angular 6

I've been working on processing data from an API using Angular 6. Despite seeing that the data is being returned in the Network tab, I'm having trouble processing it after the call is complete.

The data returned by my service:

    {"profile": "German DJ and producer based in Berlin. He is the founder of a label."}

My fetch method:

  public fetchData(): Observable<DiscogsRecord> {
    return this.http.get(this.url).pipe(
    map(response => response["profile"]),
    catchError(this.errorHandler("Error loading music data.", []))
  );
 }

Defined interface for DiscogsRecord:

export interface DiscogsRecord {
  profile: string;
}

Within ngOnInit:

ngOnInit() {
this.recs = [];
this.dataService.fetchData().subscribe(records => (this.recs = records));
console.log(this.recs);

... etc

Upon logging this.recs, it appears empty as an array: []. Can anyone spot what might be going wrong here?

angular typescript

Answer 1

Answer №1

The issue lies in the placement of your logging.

this.dataService.fetchData().subscribe(records => (this.recs = records));
console.log(this.recs);

Since HTTP requests are asynchronous, calling fetchData will return an observable and then proceed to execute your log statement. However, at this point, the data has not been retrieved yet. It is only when the data is fetched that the code within your subscribe function is called.

To address this, it is important to move your logging statement INSIDE your subscribe function.

this.dataService.fetchData().subscribe(records => 
   {
    this.recs = records;
    console.log(this.recs);
  });

Answer 2

The issue lies in the placement of your logging.

this.dataService.fetchData().subscribe(records => (this.recs = records));
console.log(this.recs);

Since HTTP requests are asynchronous, calling fetchData will return an observable and then proceed to execute your log statement. However, at this point, the data has not been retrieved yet. It is only when the data is fetched that the code within your subscribe function is called.

To address this, it is important to move your logging statement INSIDE your subscribe function.

this.dataService.fetchData().subscribe(records => 
   {
    this.recs = records;
    console.log(this.recs);
  });

Answer 3

Answer №2

Simply, send back the reply from your service,

 this.http.get(this.url).subscribe(
    response => {
       console.log(response);
    }

Make sure to handle the data within the subscribe function

this.dataService.getData().subscribe((data) => { 
 this.info = data;
 console.log(this.info[0].details);
});

Answer 4

Simply, send back the reply from your service,

 this.http.get(this.url).subscribe(
    response => {
       console.log(response);
    }

Make sure to handle the data within the subscribe function

this.dataService.getData().subscribe((data) => { 
 this.info = data;
 console.log(this.info[0].details);
});

Issue with handling data from web api in Angular 6

Answer №1

Answer №2

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