Question

我将Angular项目更新为Angular 6并且不知道如何进行http获取请求。这就是我在Angular 5中的表现：

get(chessId: string): Observable<string> {

this.loadingPanelService.text = 'Loading...';
this.loadingPanelService.isLoading = true;

const url = `${this.apiPathService.getbaseUrl()}api/chess/${chessId}/rating`;   

return this.http.get<string>(url)
.catch((error) => {
    console.error('API error: ', error);

    this.loadingPanelService.isLoading = false;
    this.notificationService.showErrorMessage(error.message);

    return Observable.of(null);
  })
  .share()
  .finally(() => {
    this.loadingPanelService.isLoading = false;
  });

这就是我现在这样做的方式。这是应该如何在Angular 6中完成的吗？

...
return this.http.get<string>(url)
.pipe(
  catchError(this.handleError),
  share(),
  finalize(() =>{this.loadingPanelService.isLoading = false})
);

private handleError(error: HttpErrorResponse) {
console.error('API error: ', error);

this.loadingPanelService.isLoading = false;
this.notificationService.showErrorMessage(error.message);

// return an observable with a user-facing error message
return throwError(
  'Something bad happened; please try again later.');
};

Answer 1

在角度6中调用http的方式是正确的。尽管我共享代码段，但请记住，我们可以在管道内传递多个运算符并全部返回Observable对象，因此您无需显式将此运算符的输出隐藏为Observable。

import { Http, Response } from '@angular/http'
import { throwError } from 'rxjs';
import { map, catchError } from 'rxjs/operators';

.....
 return this.http.get(url)
    .pipe(map((response : Response) => {
        return response.json();   
    }), catchError((error: Response) =>{
        this.loadingPanelService.isLoading = false;
        this.notificationService.showErrorMessage(error.message);
        return throwError('Something went wrong');      
    }), finalize(() => {
        this.loadingPanelService.isLoading = false;
    }));

您还可以使用HttpClient。如果您想为httpClient回答，请分别发布您的问题。

希望这对您有帮助

Answer 2

这是一个示例，但您可以在https://angular.io/guide/http中获得更多信息：

getByEmail(email): Observable<void> {   
    const endpoint = API_URL + `/api/datos_privados/email/${email}`;
    return this.httpClient.get<void>(endpoint,
        {
            headers: new HttpHeaders()
                .set('Accept', 'aplication/json')
        });
}

HTTP在Angular 6中调用

2 个答案: