@angular/router

CanActivateFn

Type Alias

The signature of a function used as a canActivate guard on a Route.

type CanActivateFn = (
  route: ActivatedRouteSnapshot,
  state: RouterStateSnapshot,
) => MaybeAsync<GuardResult>

The signature of a function used as a canActivate guard on a Route.

If all guards return true, navigation continues. If any guard returns false, navigation is cancelled. If any guard returns a UrlTree, the current navigation is cancelled and a new navigation begins to the UrlTree returned from the guard.

The following example implements and uses a CanActivateFn that checks whether the current user has permission to activate the requested route.

          
            @Injectable()class UserToken {}@Injectable()class PermissionsService {  canActivate(currentUser: UserToken, userId: string): boolean {    return true;  }  canMatch(currentUser: UserToken): boolean {    return true;  }}const canActivateTeam: CanActivateFn = (  route: ActivatedRouteSnapshot,  state: RouterStateSnapshot,) => {  return inject(PermissionsService).canActivate(inject(UserToken), route.params['id']);};

Here, the defined guard function is provided as part of the Route object in the router configuration:

          
            bootstrapApplication(App, {   providers: [     provideRouter([       {         path: 'team/:id',         component: TeamComponent,         canActivate: [canActivateTeam],       },     ]),   ], });