The Angular 2 router is not compatible with using the same component but with different IDs

Currently utilizing the alpha8 router with 3 main routes:

export const appRoutes: RouterConfig = [
    { path: '', component: LandingComponent },
    { path: 'blog', component: BlogComponent },
    { path: 'posts/:id', component: PostComponent },
    { path: 'posts', redirectTo: 'blog' },
    { path: '**', redirectTo: ''}  
];

While navigating from the BlogComponent, links work well to featured posts. However, when in the PostComponent, only the url address is affected by id changes. Links within the component are structured as follows:

<a [routerLink]="['/posts/'+post.id]">...</a>

For example, accessing localhost:5000/blog successfully routes to localhost:5000/posts/19. But transitioning from localhost:5000/posts/19 does not lead to localhost:5000/posts/20, merely altering the url without executing contstructor or ngOnInit. What steps can be taken to resolve this issue?

Answer №1

To detect changes in URL parameters, it is necessary to include a "subscriber" within the ngOnInit lifecycle hook in your component. Additionally, make sure to unsubscribe inside ngOnDestroy to prevent memory leaks.

import { Component, OnInit, OnDestroy } from '@angular/core';
import { ActivatedRoute } from '@angular/router';

@Component({
    selector: 'your-posts-component'
})
export class PostsComponent implements OnInit, OnDestroy {

private sub: any;

constructor(private route: ActivatedRoute ) {}

// add a subscriber to watch for changes in the url
ngOnInit() {
    this.sub = this.route.params
       .subscribe(params => {
          // extract id from params
          let id = +params['id'];

          // perform actions with id here

        });
      }
}

// unsubscribe to avoid memory leaks
ngOnDestroy() {
    this.sub.unsubscribe();
}

This approach allows detecting changes in URL parameters when revisiting a component without navigating through another component.

Answer №2

To enable the reload option for onSameUrlNavigation:

  imports: [RouterModule.forRoot(routes, {onSameUrlNavigation: 'reload'})],

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