Question

我的组件中有代码

export class AddNewCardComponent { 

    public concept = [];
    constructor( 
        private _router: Router,
        private _empDiscService: empDiscService) { 

        }

    ngOnInit(){
        this.concept = this._empDiscService.StoreMaster()
        .subscribe((data)=>{
            this.concept =  data;
        });
    }
}

它只是我想从服务中获取var并将其放入我的商店= [];

但它说

类型void不能分配给任何
类型

这是我的服务代码

import {Injectable} from '@angular/core';
import { Httpprovider } from './httpprovider';

@Injectable()
export class empDiscService{

    public storedata = [];
    constructor(private _httpprovider: Httpprovider){

    }

    StoreMaster():Observable<any[]>{
        return this._httpprovider.httpReq('http://192.168.1.40:5000/getconcept','GET',null,null).map(res =>{<any[]>res.json()}
    };
}

Answer 1

import { JobService } from './../services/job.service';
import { Component, OnInit } from '@angular/core';



@Component({
  selector: 'app-job-list',
  templateUrl: './job-list.component.html',
  styleUrls: ['./job-list.component.css']
})
export class JobListComponent implements OnInit {

 **jobs:any = [];**
erreur = '';
  constructor( private jobservice:JobService) { }

  ngOnInit() {
    this.jobservice.getJobs().subscribe(

      data => this.jobs = data,
      error => {console.log ('error')}

    );


  }

}

Answer 2

您不得subscribe()在服务中并直接返回对象，这不是 RxJs 的目的。

export class empDiscService{

    public storedata = [];
    constructor(private _httpprovider: Httpprovider){

    }
    StoreMaster():Observable<any[]>{
       return this._httpprovider.httpReq('http://192.168.1.40:5000/getmapmasterstore','GET',null,null).map(res =>{<any[]>res.json()}
    }

}

您的组件应该是

constructor( 
        private _router: Router,
        private _empDiscService: empDiscService) { 
          this.store = this._empDiscService.StoreMaster()
            .subscribe((data)=>{
                    this.storedata =  data;
        });
}

你犯的实际错误是服务方法没有返回任何内容

StoreMaster():Observable<any[]>{}

这将解决您的问题

Answer 3

StoreMaster（）方法不返回任何内容。您可能需要更改服务方法以返回observable：

StoreMaster(){
return this._httpprovider.httpReq('http://192.168.1.40:5000/getmapmasterstore','' +
  '  GET',null,null).subscribe((data)=>{
  var brData = [];
  for (let i=0;i<data.length;i++){
    brData.push(data[i]);
  }
  return brData;
});
}

和ngOnInit

    ngOnInit(){
        this._empDiscService.StoreMaster()
            .subscribe(store => this.store = store);
    }

类型void不能分配给任何类型

3 个答案: