Angular如何在自定义ErrorHandler中使用HttpClient?

时间:2020-04-10 13:50:02

标签: angular angular-httpclient angular-errorhandler

我想在我的自定义错误处理程序中调用rest API,以便在调用处理程序时通过电子邮件发送给自己。

我尝试使用喷油器,但出现此错误:

Error: Cannot instantiate cyclic dependency! HttpClient

在这里您可以看到我的错误处理程序:

import { Router } from '@angular/router';
import { ErrorHandler, Injector, Injectable, NgZone } from '@angular/core';
import { ToastrService } from 'ngx-toastr';
import { HttpClient } from '@angular/common/http';

@Injectable()
export class AppErrorHandler extends ErrorHandler {

  constructor(private injector: Injector) {
    super();
  }

  private get toastrService(): ToastrService {
    return this.injector.get(ToastrService);
  }

  private get http(): HttpClient {
    return this.injector.get(HttpClient);
  }

  private get router(): Router {
    return this.injector.get(Router);
  }

  private get ngZone(): NgZone {
    return this.injector.get(NgZone);
  }

  public handleError(error: any): void {
    if (error.status === 401) {
      this.ngZone.run(() => this.router.navigate(['/home']));
      this.toastrService.error('Login first', 'Error');
    } else if (error.status === 403) {
      this.ngZone.run(() => this.router.navigate(['/home']));
      this.toastrService.error('unauthorize', 'Error');
    } else {
      this.http.post<any>('/api/error-mailer', error).subscribe(() => { });
      this.toastrService.error('Something went wrong', 'Error', { onActivateTick: true });

    }

    super.handleError(error);
  }
}

我也可能会说错方法,所以如果您能帮助我,那太好了!

1 个答案:

答案 0 :(得分:2)

您应该使用http interceptor处理httpClient错误。在拦截器中,您可以注入所需的服务。但是,您应该注意从拦截器调用http请求,因为它将通过拦截器运行,并且当错误邮件程序关闭时,您最终可能会出现循环。