CODEWITHSUNDEEP
angular
user6771230
user6771230

Reputation: 11

Wait for get request - Angular 2

I get a GET request and I would like to wait for a response to run code how do i do this?

My code

valid()
{
    let headers = new Headers({ 'Content-Type': 'application/json'});
    let options = new RequestOptions({ headers: headers, method: "get" }); 
    return this.http.get(this.urlstring+ "getisvalid" , options ).toPromise().then(response => response.json());
}

//Code that is in the function

     this._service.valid().then(resut => this.resut = resut);

Upvotes: 1

Views: 1640

Answers (2)

John Baird
John Baird

Reputation: 2676

When you subscribe to an observable, you can provide a callback function; in the example below, I call it CompleteValidCall. CompleteValidCall() will only be invoked on a successful get that returns data and not an error. You place whatever follow on logic you need in the callback function.

this._service.valid()
   .subscribe(
      result => this.result = result,
      error => this.error = error,
      () => this.CompleteValidCall()
);

completeValidCall() {
  // the rest of your logic here - only executes on obtaining result.
}

Upvotes: 1

kit
kit

Reputation: 4920

this.http.get return Observable, so you have to subscribe to it. if you change valid() to:

valid() {
  let headers = new Headers({ 'Content-Type': 'application/json'});
  let options = new RequestOptions({ headers: headers, method: "get"}); 
  return this.http.get(this.urlstring+ "getisvalid" , options ).map(response => response.json());
}

then use:

this._service.valid().subscribe(resut => this.resut = resut);

Upvotes: 0

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