CanLoad interface

This is the documentation for Angular 7.
You can switch to the latest version Angular 8.

Interface that a class can implement to be a guard deciding if a children can be loaded.

interface CanLoad {
  canLoad(route: Route, segments: UrlSegment[]): 
    Observable<boolean>|Promise<boolean>|boolean;
}

Example

class UserToken {}
class Permissions {
  canLoadChildren(user: UserToken, id: string, segments: UrlSegment[]): boolean {
    return true;
  }
}

@Injectable()
class CanLoadTeamSection implements CanLoad {
  constructor(private permissions: Permissions, private currentUser: UserToken) {}

  canLoad(route: Route, segments: UrlSegment[]): Observable<boolean>|Promise<boolean>|boolean {
    return this.permissions.canLoadChildren(this.currentUser, route, segments);
  }
}

@NgModule({
  imports: [
    RouterModule.forRoot([
      {
        path: 'team/:id',
        component: TeamCmp,
        loadChildren: 'team.js',
        canLoad: [CanLoadTeamSection]
      }
    ])
  ],
  providers: [CanLoadTeamSection, UserToken, Permissions]
})
class AppModule {}

You can alternatively provide a function with the canLoad signature:

@NgModule({
  imports: [
    RouterModule.forRoot([
      {
        path: 'team/:id',
        component: TeamCmp,
        loadChildren: 'team.js',
        canLoad: ['canLoadTeamSection']
      }
    ])
  ],
  providers: [
    {
      provide: 'canLoadTeamSection',
      useValue: (route: Route, segments: UrlSegment[]) => true,
    }
  ]
})
class AppModule {}