Typescript rxjs : is there any clean alternative to setimeout 0

user_4957388 0
Viewed 7382

Withing my angular app , I'm using this kind of treatment

myMethod(){
 ...
 setTimeout(() => {
      this.router.navigate(['mucomponent']);
 });
}

As I was told : setTimeout without a delay (0) seems to wait the next tick where all treatments are done to begin my treament. it's a planification for the near future.

Since I need this behaviour

Is there any clean aletrnative to do it the same with typescript or rxjs to do it better ?

Suggestions ?

rxjs angular typescript ecmascript-6 javascript
4 Answers

Even though the accepted answer might technically work, it is far from ideal. The RxJS team created the asapScheduler for exactly this use case.

asapScheduler.schedule(() => this.router.navigate(['mucomponent']));

From the RxJS docs:

asap scheduler will do its best to minimize time between end of currently executing code and start of scheduled task. This makes it best candidate for performing so called "deferring". Traditionally this was achieved by calling setTimeout(deferredTask, 0), but that technique involves some (although minimal) unwanted delay.

user_92915220

You can use Interval or take in rxjs;

import { interval } from 'rxjs';
import { take} from 'rxjs/operators';

myMethod() {
  interval(0).pipe(take(1),
   ).subscribe(value =>
    this.router.navigate(['mucomponent']);
}
user_112493180

This should work, and is simpler than previous solutions:

timer(0).subscribe(time => this.router.navigate(['mucomponent']));

timer() takes 2 parameters, the second is optional. If 2 parameters are provided, the first parameter is the delay, and the second parameter is the period. If only one parameter is provided, it is the delay, and the timer will only emit 1 value (it won't repeat).

From the documentation for timer():

If period is not specified (the second parameter), the output Observable emits only one value, 0.

reference: https://rxjs-dev.firebaseapp.com/api/index/function/timer

user_11972970
user_34957710
Related