Instead of subscribing to route.queryParams as an Observable, I want it to be a Promise so that I can use async/await for function calls in ngOnInit. However, my attempt at this is not working as expected. The code below does not produce any output:
constructor(private route: ActivatedRoute) { }
async ngOnInit() {
this.route.queryParams.toPromise().then(res => {
console.log(res);
});
}
Can someone please help me identify what I'm doing wrong? Thank you!
It is important to note that the queryParams observable being long-lived presents a challenge when trying to convert it to a promise directly. In order to achieve this, you must use the take operator to extract the first emission and then convert it into a promise.
import { take } from 'rxjs/operators';
....
constructor(private route: ActivatedRoute) { }
async ngOnInit() {
// To resolve this issue, include pipe(take(1)) to capture the initial emission, close the stream,
// and change it into a promise.
this.route.queryParams.pipe(take(1)).toPromise().then(res => {
console.log(res);
});
}
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