router change angular code example

Example 1: angular detect router change

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

@Component({
    selector: 'app-root',
    template: `<router-outlet></router-outlet>`
})
export class AppComponent {

    constructor(private router: Router) {

        this.router.events.subscribe((event: Event) => {
            if (event instanceof NavigationStart) {
                // Show loading indicator
            }

            if (event instanceof NavigationEnd) {
                // Hide loading indicator
            }

            if (event instanceof NavigationError) {
                // Hide loading indicator

                // Present error to user
                console.log(event.error);
            }
        });

   }
}

Example 2: angular navigate using component

import {Router} from '@angular/router'; // import router from angular router

export class Component{ 				// Example component.. 
	constructor(private route:Router){} 
  
  	go(){
		this.route.navigate(['/page']); // navigate to other page
	}
}

Example 3: angular routing url params

const appRoutes: Routes = [
  { path: 'crisis-center/:param1', component: CrisisListComponent },
  { path: 'hero/:param2',      component: HeroDetailComponent },
];

@NgModule({
  imports: [
    RouterModule.forRoot(
      appRoutes,
      { enableTracing: true } // <-- debugging purposes only
    )
    // other imports here
  ],
  ...
})
export class AppModule { }