How can I identify changes in the current component's routes using Angular?

Is there a way to detect route changes only within the DetailsComponent without being triggered for every route start and end event? I attempted the following approach, but it's currently capturing events for all routes.

export class DetailsComponent {

    constructor(private router: Router) {

        this.router.events.subscribe((event: Event) => {
            if (event instanceof NavigationStart) {
                // Code to handle navigation start
            }

            if (event instanceof NavigationEnd) {
                // Code to handle navigation end
            }
        });

   }
}

I specifically need to capture the URL during navigation in the DetailsComponent and perform an operation only if the URL is not "/employees".

Answer №1

If you are wondering why your events are still being detected, it may be due to the fact that you have not unsubscribed from `router.events` when your `DetailsComponent` is destroyed.

To resolve this issue, make sure to unsubscribe by following this example:

export class DetailsComponent {
  private sub = this.router.events
    .pipe(
      filter(event => event instanceof NavigationStart),
      map(event => event as NavigationStart),  // To comply with TypeScript requirements
      filter(event => event.url !== '/employees')
    )
    .subscribe(
      event => console.log('[DetailsComponent] NOT going to "/employees"!', event)
    );

  constructor(private router: Router) { }

  ngOnDestroy() {
    console.log('>> STOP listening to events for DetailsComponent');
    this.sub.unsubscribe();
  }

}

You can also check out a live example on StackBlitz.

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