Call a function every 10 seconds Angular2

StuartDTO picture StuartDTO · Sep 7, 2017 · Viewed 58.1k times · Source

I'm trying to create a Timer that calls an API call every 10 seconds, I'm using setTimeOut but the thing is that it becomes an infinite loop, and even if I push to another page it keeps joining the if condition.

Example :

I call this on a method to start the 10 seconds API calls

setTimeout(() => {
    this.onTimeOut();
}, 1000);

And this is the onTimeOut() method...

onTimeOut() {
    this.ApiCall().then(
    success => {
    if(success ['ok'] == 0){
        this.navCtrl.push(myPage);
    }
    },
    error => { console.log(error); });
}
setTimeout(() => {
    this.onTimeOut();
}, 1000);
}

I've heard about Debounce and rxjs/rs but I'm not familiar with them, could you give me some tips to do the same with that? Or if this way is more efficient go ahead and explain to me why it becomes to a loop.

The goal is when it joins the if and push the page, stop the timer.

Answer

Günter Zöchbauer picture Günter Zöchbauer · Sep 7, 2017

Better use observables

this.sub = Observable.interval(10000)
    .subscribe((val) => { console.log('called'); });

to stop it use

this.sub.unsubscribe();

Make sure to import interval with

import 'rxjs/add/observable/interval';