CanActivateChild

一个接口,某些类可以实现它以扮演一个守卫,来决定该路由的子路由能否激活。 如果所有守卫都返回 true,就会继续导航。如果任何一个守卫返回了 false,就会取消导航。 如果任何一个守卫返回了 UrlTree,就会取消当前导航,并开始导航到这个守卫所返回的 UrlTree

Interface that a class can implement to be a guard deciding if a child route can be activated. If all guards return true, navigation will continue. If any guard returns false, navigation will be cancelled. If any guard returns a UrlTree, current navigation will be cancelled and a new navigation will be kicked off to the UrlTree returned from the guard.

查看"说明"...

      
      interface CanActivateChild {
  canActivateChild(childRoute: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree
}
    

说明

class UserToken {} class Permissions { canActivate(user: UserToken, id: string): boolean { return true; } } @Injectable() class CanActivateTeam implements CanActivateChild { constructor(private permissions: Permissions, private currentUser: UserToken) {} canActivateChild( route: ActivatedRouteSnapshot, state: RouterStateSnapshot ): Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree { return this.permissions.canActivate(this.currentUser, route.params.id); } } @NgModule({ imports: [ RouterModule.forRoot([ { path: 'root', canActivateChild: [CanActivateTeam], children: [ { path: 'team/:id', component: Team } ] } ]) ], providers: [CanActivateTeam, UserToken, Permissions] }) class AppModule {}
      
      
  1. class UserToken {}
  2. class Permissions {
  3. canActivate(user: UserToken, id: string): boolean {
  4. return true;
  5. }
  6. }
  7.  
  8. @Injectable()
  9. class CanActivateTeam implements CanActivateChild {
  10. constructor(private permissions: Permissions, private currentUser: UserToken) {}
  11.  
  12. canActivateChild(
  13. route: ActivatedRouteSnapshot,
  14. state: RouterStateSnapshot
  15. ): Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree {
  16. return this.permissions.canActivate(this.currentUser, route.params.id);
  17. }
  18. }
  19.  
  20. @NgModule({
  21. imports: [
  22. RouterModule.forRoot([
  23. {
  24. path: 'root',
  25. canActivateChild: [CanActivateTeam],
  26. children: [
  27. {
  28. path: 'team/:id',
  29. component: Team
  30. }
  31. ]
  32. }
  33. ])
  34. ],
  35. providers: [CanActivateTeam, UserToken, Permissions]
  36. })
  37. class AppModule {}

你还可以转而提供一个具有 canActivateChild 签名的函数:

You can alternatively provide a function with the canActivateChild signature:

@NgModule({ imports: [ RouterModule.forRoot([ { path: 'root', canActivateChild: ['canActivateTeam'], children: [ { path: 'team/:id', component: Team } ] } ]) ], providers: [ { provide: 'canActivateTeam', useValue: (route: ActivatedRouteSnapshot, state: RouterStateSnapshot) => true } ] }) class AppModule {}
      
      
  1. @NgModule({
  2. imports: [
  3. RouterModule.forRoot([
  4. {
  5. path: 'root',
  6. canActivateChild: ['canActivateTeam'],
  7. children: [
  8. {
  9. path: 'team/:id',
  10. component: Team
  11. }
  12. ]
  13. }
  14. ])
  15. ],
  16. providers: [
  17. {
  18. provide: 'canActivateTeam',
  19. useValue: (route: ActivatedRouteSnapshot, state: RouterStateSnapshot) => true
  20. }
  21. ]
  22. })
  23. class AppModule {}

方法

canActivateChild(childRoute: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree
      
      canActivateChild(childRoute: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree
    
参数
childRoute ActivatedRouteSnapshot
state RouterStateSnapshot
返回值

Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree