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/Angular 7

CanLoad

interface

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

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

Description

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: TeamComponent,
        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: TeamComponent,
        loadChildren: 'team.js',
        canLoad: ['canLoadTeamSection']
      }
    ])
  ],
  providers: [
    {
      provide: 'canLoadTeamSection',
      useValue: (route: Route, segments: UrlSegment[]) => true
    }
  ]
})
class AppModule {}

Methods

canLoad(route: Route, segments: UrlSegment[]): Observable<boolean> | Promise<boolean> | boolean

Parameters
route Route
segments UrlSegment[]
Returns

Observable<boolean> | Promise<boolean> | boolean

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Licensed under the Creative Commons Attribution License 4.0.
https://v7.angular.io/api/router/CanLoad