typescript - Angular2 watch for route change

Question

@RouteConfig([
    {path: '/about', name: 'About', component: About, useAsDefault: true},
    {path: '/test', name: 'Test', component: Test}
])

export class MyApp {
    router: Router;
    location: Location;
    isCollapsed: boolean = true;

    // ON ROUTE CHANGE {
        this.isCollapsed = true;
    // }

    constructor(router: Router, location: Location) {
        this.router = router;
        this.location = location;
    }
}

I need change variable value on every route change, how to watch for this event in Angular 2.x?

Answer 1

In the final version of Angular (e.g. Angular 2/4), you can do this

this.router.events.subscribe((event) => {
    if(event.url) {
        console.log(event.url);
    }
});

Every time the route changes, events Observable has the info. Click here for docs.