CODEWITHSUNDEEP
angularrxjs
Ander
Ander

Reputation: 5644

How to start immediately an Angular 2 Observable when using interval

I have the following Angular 2 service that is fetching data every 5 seconds:

import { Observable } from "rxjs/Rx";
import { Http, Response } from '@angular/http';


@Injectable()
export class DataService{
  getData():{
    return Observable
        .interval(5000)
        .flatMap(() => this.http.get('http://some_url'))
        .map((res: Response) => res.json())
  }

Is there a way to have this service executing the request at the start? Otherwise it will wait for 5 seconds before the first execution.

Upvotes: 3

Views: 1718

Answers (1)

cartant
cartant

Reputation: 58400

Replace interval with timer, as it allows you to specify an initial delay:

getData():{
  return Observable
    .timer(0, 5000)
    .flatMap(() => this.http.get('http://some_url'))
    .map((res: Response) => res.json())
}

Upvotes: 3

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