Utilizing Angular Pipes for Utilizing Location

Question

Utilizing Angular Pipes for Utilizing Location

The Location service in Angular is described as "A service that applications can use to interact with a browser's URL."

One of its methods, getState(), provides "the current state of the location history," while another method, subscribe(), allows users to subscribe to the "platform's popState events."

While both of these features are useful, I am interested in finding out how to access the observable of Location so that I can apply rxjs operators using .pipe before utilizing .subscribe.

angular typescript rxjs rxjs-pipeable-operators

Answer 1

Answer №1

Perhaps not the most elegant approach, but since the Location API doesn't provide a solution, why not try this:

Listen to router events and map them to the location state:


ngOnInit() {
  const stateObservable = this.router.events.pipe(
    filter(event => event instanceof NavigationEnd),
    map(() => this.location.getState())
  );
}

Answer 2

Perhaps not the most elegant approach, but since the Location API doesn't provide a solution, why not try this:

Listen to router events and map them to the location state:


ngOnInit() {
  const stateObservable = this.router.events.pipe(
    filter(event => event instanceof NavigationEnd),
    map(() => this.location.getState())
  );
}

Answer 3

Answer №2

Unfortunately, the Angular library does not provide direct access to the private internal _subject as an observable of the Location class.

To work around this limitation, you can create a helper function that converts the result of the subscribe() method into an Observable:

import { Location, PopStateEvent } from '@angular/common';
...
const locationToObservable = (location: Location) =>
    new Observable((observer: Observer<PopStateEvent>) => 
         location.subscribe(state => observer.next(state)));

Usage:

constructor(private location: Location) {
  locationToObservable(location).pipe(map(state => ...))
}

Answer 4

Unfortunately, the Angular library does not provide direct access to the private internal _subject as an observable of the Location class.

To work around this limitation, you can create a helper function that converts the result of the subscribe() method into an Observable:

import { Location, PopStateEvent } from '@angular/common';
...
const locationToObservable = (location: Location) =>
    new Observable((observer: Observer<PopStateEvent>) => 
         location.subscribe(state => observer.next(state)));

Usage:

constructor(private location: Location) {
  locationToObservable(location).pipe(map(state => ...))
}

Utilizing Angular Pipes for Utilizing Location

Answer №1

Answer №2

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