Using Route Parameters in a Component in Angular

Let's now see how we can use route parameters inside a component class.

Let's say we have the following route with parameters:

app/app.routes.tsconst routes: Routes = [
  { path: 'aaaa/:id', component: AaaaComponent },
  { path: 'bbbb', component: BbbbComponent },
];

Let's say we have links to go to this component with different parameters:

app/app.component.html<nav>
  <a
    routerLink="/aaaa/1"
    routerLinkActive="active"
  >
    1
  </a>
  <a
    routerLink="/aaaa/2"
    routerLinkActive="active"
  >
    2
  </a>
  <a
    routerLink="/aaaa/3"
    routerLinkActive="active"
  >
    3
  </a>
</nav>

Let the child component contain the following array:

app/aaaa/aaaa.component.tslet arr: string = [
  'a', 'b', 'c', 'd', 'e'
];

export class AaaaComponent {

}

Let's get the corresponding array element depending on the value of the route parameter:

app/aaaa/aaaa.component.tsexport class AaaaComponent {
  constructor(private activateRoute: ActivatedRoute) {
    let params = activateRoute.snapshot.params;
    let id = params['id'];
    
    this.value = arr[id];
  }
}

Let's display the resulting element in the view:

app/aaaa/aaaa.component.htmlmeaning: {{ value }}

typescript[
  {
    name: 'user1',
    surn: 'surn1',
  },
  {
    name: 'user2',
    surn: 'surn2',
  },
  {
    name: 'user3',
    surn: 'surn3',
  },
]