Angular Router Event Name

The Angular(2+) router has an events property that is a rxjs subject.

Once subscribed, you are able to listen for events like:

router.events.subscribe((event: Event) => { console.log(event) });

but the problem is you have no way to obtain the event type since it listens for all events. A hacky solution is you can inspect the constructor name of the event like:

router.events.subscribe((event: Event) => {
  if(event.constructor.name === 'NavigationStart') {
    loadingService.start();
  } else if(event.constructor.name === 'NavigationEnd') {
    loadingService.complete();
    drawerService.destroyAll();
  }
});

I was curious if there was a better way to accomplish this?

Solution

Event is only the base class.

The concrete event values are one of

NavigationStart
NavigationEnd
NavigationCancel
NavigationError
RoutesRecognized

You can for example use:

constructor(router:Router) {
  router.events
    .filter(event => event instanceof NavigationStart)
    .subscribe((event:NavigationStart) => {
      // You only receive NavigationStart events
    });