如何将错误请求的响应对象从 Angular 服务返回到组件

Question

API 返回以下类型的响应 -

export class ResponseObject{
statusCode: Number;
statusMessage: string;
response: string;
}

服务 -

 singIn(user: User): Observable<ResponseObject>{
    return this._httpClient.post<ResponseObject>(`${this._svcURL}/users/signin`, user, this._httpOptions)
    .pipe(catchError(this.handleError));    
  }

  private handleError(errResponse: HttpErrorResponse){
    if(errResponse.error instanceof ErrorEvent){
      console.log("[Service] Client side error-",errResponse.error.message);
    }
    else{
      console.log("[Service]", errResponse);
    }
    return throwError("Oops! There is an issue with service. We're working on it.");
  }

组件 -

loginUser(signinForm: any): void{
    let user: User = {
      email: signinForm.email,
      password: signinForm.password
    };
    console.log('[LOGIN-COMPONENT] User details ', user);

    this._moovApiService.singIn(user)
      .subscribe((response: ResponseObject) => this.responseObject = response,
      err => {
        console.log('[LOGIN-COMPONENT] ', err);
      },
      () => {
        console.log('[LOGIN-COMPONENT] Response from service ', this.responseObject);
      }
    );
  }

如果 API 返回成功 (200, 201)，我可以获取 ResponseObject 类型的值，但如果是错误请求 (404, 400)，它不会返回任何 ResponseObject 值。它以 handleError() 方法结束。

我想获得组件中所有状态代码的响应，然后对其进行处理。我该怎么做？

Answer 1

我会把handleError() 写成public 然后做

this._moovApiService.singIn(user).subscribe(
  (data) => this.response = data,
  (err) => {
    this._moovApiService.handleError(err)
    this.response = // put any value you want here
  },
  //() => complete
)

Answer 2

如果您希望所有 HTTP 状态代码都被视为数据而不是错误，您需要从您的 handleError 返回一个 false Observable。示例：

private handleError(errResponse: HttpErrorResponse){
    return Observable.of(false);
}

Answer 3

订阅前捕获错误。

loginUser(signinForm: any): void {
        let user: User = {
            email: signinForm.email,
            password: signinForm.password
        };

        console.log('[LOGIN-COMPONENT] User details ', user);

        this._moovApiService.singIn(user).pipe(catchError(err => {
                console.log('[LOGIN-COMPONENT] ', err);
            }))
            .subscribe((response: ResponseObject) => {
                this.responseObject = response;
                console.log('[LOGIN-COMPONENT] Response from service ', this.responseObject);
            });
    }