CanLoad
类可以实现的接口，用于确定是否可以加载子路由。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 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
}
说明
一个接口，某些类可以实现它以扮演一个守卫，来决定该路由的子路由能否加载。
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 {}
你还可以转而提供一个具有 canLoad 签名的函数：
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 {}
方法
参数
返回值
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