关于Angular 2自定义http服务here的文章:它还利用另一个自定义http错误服务来处理http错误代码并重新加载屏幕,此服务的代码位于:
@Injectable()
export class HttpErrorHandler {
constructor(
private apiGateway: ApiGateway
) {
apiGateway.errors$.subscribe(
(value: any) => {
console.group("HttpErrorHandler");
console.log(value.status, "status code detected.");
console.dir(value);
console.groupEnd();
// If the user made a request that they were not authorized
// to, it's possible that their session has expired. Let's
// refresh the page and let the server-side routing move the
// user to a more appropriate landing page.
if (value.status === 401) {
window.location.reload();
}
});
}
}
我想要实现的是401错误重定向到登录路由使用:
router.navigate(['Login']);
但是,当我在HttpErrorHandler服务中注入路由器服务时,我会收到一些注入错误。
Error: EXCEPTION: Error during instantiation of Token RouterPrimaryComponent! (Token Application Initializer -> HttpErrorHandler -> Router -> RouteRegistry -> Token RouterPrimaryComponent)
注意:上面的HttpErrorHandler是在应用程序的bootstrap阶段配置的,如下所示:
bootstrap(AppComponent, [
HTTP_PROVIDERS,
ROUTER_PROVIDERS,
ApiGateway,
FriendService,
HttpErrorHandler,
//
// Make sure our "unused" services are created via the
// APP_INITIALIZER token
//
provide(APP_INITIALIZER, {
useFactory: (httpErrorHandler) => {
console.info( "HttpErrorHandler initialized." );
},
deps: [HttpErrorHandler]
})
]);
我不确定我是否在应用程序生命周期的早期注入路由器服务。有没有办法在HttpErrorHandler服务中注入路由器服务,以便可以使用客户端导航?
我创建了一个plnkr here来显示错误。
答案 0 :(得分:2)
此代码是原因:
provide(APP_INITIALIZER, {
useFactory: (httpErrorHandler) => {
console.info( "HttpErrorHandler initialized." );
},
deps: [HttpErrorHandler]
})
"在注入Router"
之前引导至少一个组件
工厂在HttpErrorHandler
之前实例化Router
和AppComponent
作为其依赖关系。