服务中未定义 Cookie |cookie 值存在于组件中 |有角的

问题描述

api.service.ts

api.service.ts

import { Injectable, Inject } from '@angular/core';
import { Http, Headers } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/throw';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/timeout';
import 'rxjs/add/operator/retry';

import { CacheService  } from './cache.service';
import { AuthService } from '../services/auth.service';
import { CookieService } from 'angular2-cookie/core';

@Injectable()
export class ApiService {
    constructor(
        public _http: Http,
        private _auth: AuthService,
        private _cookie: CookieService,
        @Inject('isBrowser') public isBrowser: boolean
        ) {}

        get(){
          console.log(this._cookie.get('Token'));//undefined
        }
    }

controller.component.ts

controller.component.ts

import { Component, OnInit, ChangeDetectionStrategy } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { ApiService } from './api.service';
import { ReviewComponent } from '../shared/+review/review.component';
import { CookieService } from 'angular2-cookie/core';
// import { ModelService } from '../shared/model/model.service';

@Component({
    selector: 'mall',
    templateUrl: './mall.component.html',
    styleUrls:['./mall.component.css'],
    providers: [ ApiService, CookieService ]
})
export class MallComponent implements OnInit {

    constructor(private _api: ApiService, private route: ActivatedRoute, private _cookie: CookieService) {}

    ngOnInit(){
        this._cookie.get('Token');// Token => value
        this._api.get(); //Token => undefined
    }
}

我不明白这种行为.当我直接在控制器中访问时，cookie 存在，但当我通过服务访问时未定义.

I don't understand this behavior. The cookie exist when i access in controller directly but is undefined when i access through service.

有没有办法通过服务访问cookie?

Is there any way to access cookie through services?

使用 https://github.com/salemdar/angular2-cookie 和 angular 通用.

using https://github.com/salemdar/angular2-cookie with angular universal.

推荐答案

在组件提供程序中添加 CookieService 是我的错误，该组件提供程序启动导致问题的新服务实例.

It was my mistake to add CookieService in component providers which initiate a new instance of service which was causing the issue.

@Component({
    selector: 'mall',
    templateUrl: './mall.component.html',
    styleUrls:['./mall.component.css'],
    providers: [ ApiService, CookieService ] //<--- here
})

CookieService 应仅导入到 AppComponent(root) 中，以使其他组件可以使用单个实例.

CookieService should only be imported into AppComponent(root) to make a single instance available to other components.

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