[英]Angular2 using @Input with router-outlet. Handling routed dumb components in ngrx/store
[英]Angular2 + ngrx/store for handling failure HTTP requests
我想有一個簡單的代碼路徑來創建和分派HTTP操作。 我想做的是:
this.http.request(...)
.map((res: Response) => res.json())
.catch((err: any) => err.json())
.map((payload: any) => { type: 'SUCCESS', payload })
.catch((payload: any) => { type: 'FAILURE', payload})
.subscribe((action: Action) => this.store.dispatch(action));
這樣,成功和失敗響應都轉換為JSON,然后根據成功/失敗標准分配正確的減少類型,以便可以正確地操作商店。 (認為用戶登錄成功和失敗,返回200或401)。
是否有更清潔或更好的處理方式? 當前第二個.catch
不能很好地發揮,因為它沒有返回一個可觀察的。
建議或其他解決方案歡迎?
從ngrx
的example-app ngrx
,對於這種情況,建議使用@Effects (檢查docs文件夾)和IMO,是一種更清晰的方法,檢查服務:
@Injectable()
export class AuthService {
private headers: Headers;
private API_ENDPOINT: string = "/api/user/";
public constructor(
private http: Http,
private localStorageService: LocalStorageService
) {
this.headers = new Headers({ 'Accept': 'application/json' });
}
public login(email: string, password: string): Observable<AuthUser> {
return this.http
.post(this.API_ENDPOINT + 'login', { 'email': email, 'password': password }, this.headers)
.map(res => res.json().data as AuthUser)
.catch(this.handleError);
}
private handleError(error: Response | any) {
let body = error.json();
// .. may be other body transformations here
console.error(body);
return Observable.throw(body);
}
}
並檢查效果:
@Injectable()
export class AuthEffects {
constructor(
private actions$: Actions,
private authService: AuthService,
private localStorageService: LocalStorageService
) { }
@Effect() logIn$: Observable<Action> = this.actions$
.ofType(auth.ActionTypes.LOGIN)
.map((action: Action) => action.payload as LoginCredentials)
.switchMap((credentials: LoginCredentials) => this.authService.login(credentials.email, credentials.password))
.do((user: AuthUser) => this.localStorageService.setUser(user))
.map((user: AuthUser) => new auth.LoginSuccessAction(user))
.catch((error) => of(new auth.FlashErrors(error)));
}
當然,您需要在appModule上設置效果:
@NgModule({
imports: [
StoreModule.provideStore(reducer),
EffectsModule.run(AuthEffects),
RouterStoreModule.connectRouter(), // optional but recommended :D
],
declarations: [...],
providers: [AuthService, LocalStorageService, ...]
})
export class AuthModule {}
從repo中了解有關docs文件夾的ngrx / effects的更多信息。
在我的一項服務中,我這樣做:
get(url, actionType) {
this._http.get(BASE_URL + url)
.map(response => response.json())
.map(payload => ({ type: actionType, payload }))
.subscribe(action => this.store.dispatch(action), error => this._apiErrorHandler(error));
}
private _apiErrorHandler(response) {
let payload = response.json().error;
this.store.dispatch({ type: 'API_ERROR', payload });
}
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