interface
Interface that a class can implement to be a guard deciding if children can be loaded. If all guards return true
, navigation continues. If any guard returns false
, navigation is cancelled. If any guard returns a UrlTree
, current navigation is cancelled and a new navigation starts to the UrlTree
returned from the guard.
interface CanLoad { canLoad(route: Route, segments: UrlSegment[]): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree }
The following example implements a CanLoad
function that decides whether the current user has permission to load requested child routes.
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); } }
Here, the defined guard function is provided as part of the Route
object in the router configuration:
@NgModule({ imports: [ RouterModule.forRoot([ { path: 'team/:id', component: TeamComponent, loadChildren: 'team.js', canLoad: [CanLoadTeamSection] } ]) ], providers: [CanLoadTeamSection, UserToken, Permissions] }) class AppModule {}
You can alternatively provide an in-line 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 {}
canLoad() | ||||||
---|---|---|---|---|---|---|
|
route | Route | |
segments | UrlSegment[] |
Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree
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Licensed under the Creative Commons Attribution License 4.0.
https://v12.angular.io/api/router/CanLoad