CanActivate
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 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.
interface CanActivate {
canActivate(route: 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 CanActivate {
constructor(private permissions: Permissions, private currentUser: UserToken) {}
canActivate(
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: 'team/:id',
component: TeamComponent,
canActivate: [CanActivateTeam]
}
])
],
providers: [CanActivateTeam, UserToken, Permissions]
})
class AppModule {}
你还可以转而实现一个带有 canActivate 签名的函数：
You can alternatively provide a function with the canActivate signature:
@NgModule({
imports: [
RouterModule.forRoot([
{
path: 'team/:id',
component: TeamComponent,
canActivate: ['canActivateTeam']
}
])
],
providers: [
{
provide: 'canActivateTeam',
useValue: (route: ActivatedRouteSnapshot, state: RouterStateSnapshot) => true
}
]
})
class AppModule {}
方法
参数
返回值
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