How to detect a rout...

To detect a route change in Angular, you can subscribe to the router events observable provided by the Angular Router. This observable emits navigation-related events, including start and end of navigation, route recognition, and errors. Here's a step-by-step guide on how to implement route change detection:

1. Import the Router and Event Types: First, you need to import Router and the event types you want to listen for from @angular/router. The event types include NavigationStart, NavigationEnd, NavigationCancel, NavigationError, and others.

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   import { Router, Event, NavigationStart, NavigationEnd, NavigationCancel, NavigationError } from '@angular/router';

2. Subscribe to Router Events: Inject the Router into your component's constructor and subscribe to its events observable. You can then filter the events based on their instance type to detect specific navigation events.

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   constructor(private router: Router) {
       this.router.events.subscribe((event: Event) => {
           if (event instanceof NavigationStart) {
               // Navigation is starting
               console.log('Route change detected');
           } else if (event instanceof NavigationEnd) {
               // Navigation End
               console.log(event);
           } else if (event instanceof NavigationCancel) {
               // Navigation Cancel
               console.log('NavigationCancel ', event.url);
           } else if (event instanceof NavigationError) {
               // Navigation Error
               console.log(event.error);
           }
       });
   }

3. Handle Route Change Logic: Inside the subscription, you can implement the logic you want to execute on route changes. For example, you might want to show a loading indicator when navigation starts and hide it when navigation ends.

4. Unsubscribe to Prevent Memory Leaks: It's important to unsubscribe from the router events when the component is destroyed to prevent memory leaks. This can be done by implementing the OnDestroy lifecycle hook and using a subscription object to keep track of the subscription.

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   import { Subscription } from 'rxjs';
   
   export class MyComponent implements OnDestroy {
       private subscription: Subscription;
   
       constructor(private router: Router) {
           this.subscription = this.router.events....