CanDeactivate
类可以实现的接口，用于确定是否可以离开某个路由。如果所有守卫都返回了 true，那么导航将继续。如果任何守卫返回 false，则导航将被取消。如果任何守卫返回 UrlTree ，当前导航被取消，新的导航开始到守卫所返回的 UrlTree。
Interface that a class can implement to be a guard deciding if a route can be deactivated. 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 begins to the UrlTree returned from the guard.
interface CanDeactivate<T> {
canDeactivate(component: T, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot, nextState?: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree
}
说明
一个接口，某些类可以实现它以扮演一个守卫，来决定该路由能否停用。 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。
The following example implements a CanDeactivate function that checks whether the current user has permission to deactivate the requested route.
class UserToken {}
class Permissions {
canDeactivate(user: UserToken, id: string): boolean {
return true;
}
}
在此，定义的守卫函数作为路由器配置中的 Route 对象：
Here, the defined guard function is provided as part of the Route object in the router configuration:
@Injectable()
class CanDeactivateTeam implements CanDeactivate<TeamComponent> {
constructor(private permissions: Permissions, private currentUser: UserToken) {}
canDeactivate(
component: TeamComponent,
currentRoute: ActivatedRouteSnapshot,
currentState: RouterStateSnapshot,
nextState: RouterStateSnapshot
): Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree {
return this.permissions.canDeactivate(this.currentUser, route.params.id);
}
}
@NgModule({
imports: [
RouterModule.forRoot([
{
path: 'team/:id',
component: TeamComponent,
canDeactivate: [CanDeactivateTeam]
}
])
],
providers: [CanDeactivateTeam, UserToken, Permissions]
})
class AppModule {}
你还可以转而提供具有 canDeactivate 签名的函数：
You can alternatively provide an in-line function with the canDeactivate signature:
@NgModule({
imports: [
RouterModule.forRoot([
{
path: 'team/:id',
component: TeamComponent,
canDeactivate: ['canDeactivateTeam']
}
])
],
providers: [
{
provide: 'canDeactivateTeam',
useValue: (component: TeamComponent, currentRoute: ActivatedRouteSnapshot, currentState:
RouterStateSnapshot, nextState: RouterStateSnapshot) => true
}
]
})
class AppModule {}
方法
参数
返回值
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