无法将数据从Service传递到Angular中的Component

时间:2018-06-17 16:34:09

标签: angular post get

我正在尝试将数据从我的服务传递到我的组件,但无法这样做。以下是服务和组件的代码:

authService.service.ts

import { Injectable } from '@angular/core';
import { HttpHeaders } from '@angular/common/http';
import{Http, RequestOptions,Headers} from '@angular/http'
import { Observable} from 'rxjs';
import { URLSearchParams,Response } from '@angular/http';


 @Injectable()

  export class AuthenticationService
    {
         constructor(private http: Http) { }
         username:string = 'Admin';
         password:string='livelink';  
         result :any;

        login() 
         {

           let urlSearchParams = new URLSearchParams();
           urlSearchParams.append('Username', this.username);
           urlSearchParams.append('Password', this.password);

    return this.http.post('http://localhost/otcs/cs.exe/api/v1/auth',urlSearchParams)
        .subscribe((res:Response) => 
        {               
            const data = res.json();                                    
            let headers = new Headers({
                'OTCSTICKET': data['ticket']
            });

            let request_options = new RequestOptions({ headers:headers});

           return this.http.get("http://localhost/otcs/cs.exe/api/v1/nodes/16236/output",request_options)          
               .subscribe(data =>
               {    
                   const report = data.json();
                   this.result = report;
                   console.log(this.result);             
               },
                err => {
                    console.log(err);                
                }


       )});


   }
}

应用组件

      import { Component } from '@angular/core';
      import { AuthenticationService } from './authNew.servive';
      import { HttpClient, HttpHeaders } from '@angular/common/http';
      import{Http, RequestOptions,Headers} from '@angular/http'
      import { Observable} from 'rxjs';
      import { URLSearchParams,Response } from '@angular/http';

      @Component({
                selector: 'app-root',
                templateUrl: './app.component.html',
                styleUrls: ['./app.component.css']
                 })

           export class AppComponent 
         {

             constructor(private authenticationservice:AuthenticationService)
              {

                this.authenticationservice.login().subscribe(res:Response =>
                  {
                    //somecode
                   }) ;

            }

         }

问题是当我尝试在AppComponent中订阅时,我得到以下错误:

enter image description here

我知道我在做一些非常愚蠢的事情。此外,我尝试在我的服务中使用map而不是subscribe进行POST和GET调用,但在这种情况下,我得到如下所示的错误:

enter image description here

我正在导入' rxjs / add / operator / map&#39 ;;当我试图使用地图时,我仍然得到错误,因此我想在服务本身内订阅,但这也没有帮助。请帮助我理解如何对其进行排序并从我的服务中获取数据以便在AppComponent中使用。

谢谢!

1 个答案:

答案 0 :(得分:0)

您在服务和组件中订阅了两次。

您在官方教程中应该如何管理此方案:

Tour of heroes http

简历是你应该在你的服务中获得可观察的

return this.http.get("http://localhost/otcs/cs.exe/api/v1/nodes/16236/output",request_options);   

并管理组件中的订阅:

this.authenticationservice.login().subscribe(res:Response =>
                  {
                    //somecode
                   }) ;