使用组件的Angular 2自定义HTTP错误处理

Question

This is what I have so far:

@Component({
  selector: 'error-handler',
  templateUrl: 'error-handler.html'
})
export class ErrorHandlerComponent extends ErrorHandler {

  text: string;

  constructor() {
    super();
  }

  handleError(error: HttpErrorResponse) {
    console.log("ErrorHandlerComponent, error.status: ", error.status);
    this.text = error.message;
  }
}

But my the flow doesn't go into handleError, I get the below error:

polyfills.js:3 Uncaught Response {_body: ProgressEvent, status: 0, ok: false, statusText: "", headers: Headers, …}

Answer 1

Your ErrorHandler needs to be an @Injectable , not a @Component . It doesn't have a view associated with it - it's a service. It should look something like this:

@Injectable()
export class MyErrorHandler extends ErrorHandler {

  constructor() {
    super();
  }

  handleError(error) {
    // do whatever

    super.handleError(error);
  }
}