Ionic 2のインターセプタを使用してステータス401を取得する際にログインページに移動します。

Question

import { Injectable } from '@angular/core'; 
import { Http, ConnectionBackend, Headers, RequestOptions, Request, Response, RequestOptionsArgs } from '@angular/http'; 
import { Observable } from 'rxjs/Observable'; 
import 'rxjs/add/operator/catch'; 
import 'rxjs/add/observable/throw'; 

@Injectable() 
export class SecureHttpService extends Http { 

    constructor(backend: ConnectionBackend, defaultOptions: RequestOptions) { 
    super(backend, defaultOptions); 
    } 

    request(url: string | Request, options?: RequestOptionsArgs): Observable<Response> { 
    // return super.request(url, options); 
    return super.request(url, options).catch(this.catchErrors()); 
    } 

    private catchErrors() { 
    return (res: Response) => { 
     if (res.status === 401 || res.status === 403) { 
      //nav.push(loginPage); I want to do something like this if status is 401 
     debugger; 
     } 
     return Observable.throw(res); 
    }; 
    } 

401エラーステータスがある場合はログインページに移動しようとしていますが、イオンはサービス内でサービスを使用できません。これはどのように達成できますか？

app.module.ts： - あなたのapp.component.tsまたはそのことについてあなたの最初のページで

providers: [ 
{ 
    provide: Http, 
    useFactory: (backend:XHRBackend, defaultOptions:RequestOptions) => { 
     return new SecureHttpService(backend, defaultOptions); 
    }, 
    deps: [XHRBackend, RequestOptions] 
}, 
StatusBar, 
SplashScreen, 
{provide: ErrorHandler, useClass: IonicErrorHandler} 
] 

Answer 1

：

import { NavController, Events } from 'ionic-angular'; 

    constructor(navCtrl: NavController, events: Events) { 
     this.events.subscribe('http:forbidden', error => { 
      this.navCtrl.push(LoginPage, {errorMessage: error}); 
     }); 
    } 

今、あなたは自分のサービスから発することができる：

import { Injectable } from '@angular/core'; 
import { Http, ConnectionBackend, Headers, RequestOptions, Request, Response, RequestOptionsArgs } from '@angular/http'; 
import { Observable } from 'rxjs/Observable'; 

import { Events } from 'ionic-angular'; 

import 'rxjs/add/operator/catch'; 
import 'rxjs/add/observable/throw'; 

@Injectable() 
export class SecureHttpService extends Http { 

    constructor(public events: Events, backend: ConnectionBackend, defaultOptions: RequestOptions) { 
    super(backend, defaultOptions); 
    } 

    request(url: string | Request, options?: RequestOptionsArgs): Observable<Response> { 
    // return super.request(url, options); 
    return super.request(url, options).catch(this.catchErrors()); 
    } 

    private catchErrors() { 
    return (res: Response) => { 
     if (res.status === 401 || res.status === 403) { 
      // will trigger the event defined earlier which did have access to the NavController 
      this.events.publish('http:forbidden', "Something went wrong."); 
     debugger; 
     } 
     return Observable.throw(res); 
    }; 
    } 

を