Look at the routing events in an Angular 4 application.

ngOnInit() {
   this.whereAreWeReally = this.activatedRoute.snapshot.url[0] ?
         this.activatedRoute.snapshot.url[0].path : '' ;
   this.router.events.subscribe((event:any) => {
      if(event.toString().split("(")[0] === 'NavigationCancel'){
         this.isNavigationCanceled = true;
      }
      if(event.url) {
         const routePieces = event.url.split("/");
         this.whereAreWeMaybe = routePieces[routePieces.length - 1];
      }
      if(event.route) {
         this.whereAreWeMaybe = event.route.path;
      }
   });
}

 
 

Routing events may vary. NavigationStart, RoutesRecognized, GuardsCheckStart, GuardsCheckEnd, ResolveStart, ResolveEnd, and NavigationEnd should come in said order and if NavigationCancel appears the last three of these will not appear.