Property 'subscribe' does not exist on typ

问题:

service file

import { Observable } from 'rxjs/Rx';
import { Http,Response} from '@angular/http';
import { Injectable } from '@angular/core';
import 'rxjs/add/operator/Map';
 @Injectable()
export class VideoService {

private geturl='/api/videos';
constructor(private _http:Http) { }

getvideos()
{
return this._http.get(this.geturl)
.map((response:Response) => response.json());
}


}

here is where the subscribe method showing this error

import { VideoService } from '../video.service';
import { Component, OnInit } from '@angular/core';
import {Video} from '../video';
import {Observable} from 'rxjs/Observable';


@Component({
  selector: 'app-videocenter',
  templateUrl: './videocenter.component.html',
  styleUrls: ['./videocenter.component.css']
})
export class VideocenterComponent implements OnInit {
  videos: any;
  onselectvideo:Video;
  switch:boolean=false

  constructor(private videoserv:VideoService) {
//console.log(this.videos);
  }
onselect(vid:any)
{
  this.switch=true;
  this.onselectvideo =vid;
  console.log(vid);
}
ngOnInit() {

this.videos=this.videoserv.getvideos
  .subscribe(responce=>this.videos=responce);
  }

  }

i have service file in which i have to call my api to get the api's and when i am going to subscribe the method in the other class where i am calling that service method getvideos() then its showing the error that the property "subscribe " does not exist on type ()=> observable

回答1:

You are not calling the getVideos method. You are calling subscribe on the function reference of getVideos and not the returned value. Call subscribe after you call getVideos():

ngOnInit() {

     this.videoserv.getvideos()
        .subscribe(response => this.videos = response);
}

回答2:

ngOnInit() {

   this.videoserv.getvideos()
  .subscribe(responce=> this.videos = responce);
}

You should be calling the getvideos() method on the videoserv service. You were missing the (), getvideos is a method not a property.