Angular2服務迭代

Question

我需要從JSON API獲取數組，然后對其進行迭代。 我仍然不明白它是如何工作的。 謝謝你的幫助。

這就是我的服務外觀。

import {Injectable} from '@angular/core';
import { Http } from "@angular/http";
import "rxjs/Rx";

@Injectable()
export class PlayersService {
    roster:Roster[];

    constructor(private http: Http){
        this.roster = [];
    }


    getPlayer(id) {
       for (let player of this.roster) {
            console.log(player["id"]);
        }   
    }


    getRoster(season,category) {
        this.roster.push(this.http.get("http://API JSON LIST OF ID")
            .map(res => res.json()));
    }

}

interface Roster {
    id:number
}

這就是我所說的

ngOnInit() {
   this.getRoster();
   this.getPlayers();
}

請問失敗在哪里？

Answer 1

這應該做您想要的：

@Injectable()
export class PlayersService {
    roster:Roster[];

    constructor(private http: Http){
        this.roster = [];
    }

    getPlayer(id) {
       for (let player of this.roster) {
            console.log(player["id"]);
        }   
    }

    getRoster(season,category) {
        return this.http.get("http://API JSON LIST OF ID")
       .map(res => res.json())
       .do(val => this.roster.push(val));  // the do operator should be used for side effects (eg modifying an existing array)
    }
}

ngOnInit() {
   this.playerService.getRoster().subscribe(val => this.playerService.getPlayer());
}