In Angular, you can subscribe to actual view changes using the Router and the ActivatedRoute service. When the view changes, the Router emits navigation events, and the ActivatedRoute provides information about the currently activated route, including its parameters, data, and other relevant details.

To subscribe to actual view changes, you can use the Router.events and ActivatedRoute to track when the view is activated and get the updated route data or parameters.

Here's how you can do it:

  1. Import Required Dependencies: Make sure to import the necessary Angular modules and services in your component:

    typescript
    import { Component, OnInit } from '@angular/core'; import { Router, ActivatedRoute, NavigationEnd } from '@angular/router'; import { filter } from 'rxjs/operators';
  2. Subscribe to Route Changes: In your component, you can subscribe to the Router.events to get notified whenever the view changes. To ensure that you only get the events related to navigation end (actual view changes), you can use the filter operator from RxJS.

    typescript
    export class YourComponent implements OnInit { constructor(private router: Router, private route: ActivatedRoute) {} ngOnInit() { this.router.events .pipe(filter((event) => event instanceof NavigationEnd)) .subscribe(() => { // Do something when the view changes this.handleViewChange(); }); } private handleViewChange() { // Get updated route data and parameters const routeData = this.route.snapshot.data; const routeParams = this.route.snapshot.params; // Do something with the route data and parameters } }

    The handleViewChange() method will be called every time the view changes, and you can access the updated route data and parameters using this.route.snapshot.data and this.route.snapshot.params.

  3. Unsubscribe: It's important to unsubscribe from the subscription when the component is destroyed to avoid memory leaks. You can do this in the ngOnDestroy lifecycle hook:

    typescript
    export class YourComponent implements OnInit, OnDestroy { private viewChangeSubscription: Subscription; constructor(private router: Router, private route: ActivatedRoute) {} ngOnInit() { this.viewChangeSubscription = this.router.events .pipe(filter((event) => event instanceof NavigationEnd)) .subscribe(() => { this.handleViewChange(); }); } private handleViewChange() { // ... } ngOnDestroy() { if (this.viewChangeSubscription) { this.viewChangeSubscription.unsubscribe(); } } }

By subscribing to the Router.events and filtering for NavigationEnd, you can detect actual view changes in your Angular application and perform actions or update data accordingly.

Have questions or queries?
Get in Touch