使用服务 angularjs 2 输入数据

Question

所以我正在学习 angularjs 2，但在理解服务的用途和让它与我的应用程序一起工作时遇到了困难。

film.services.ts

   import { Injectable } from "@angular/core";

import { Film } from './film';
import { FILMS } from './mock-films';

@Injectable()
export class FilmService {
  getFilms(): Promise<Film[]> {
    return Promise.resolve(FILMS)
  }
}

模拟电影

import { Film } from './film';

//storing the data in array
export const FILMS: Film[] = [
  {id:11, title: 'pokemon', summary:'great'},
  {id:12, title: 'naruto', summary: 'good'},
  {id:13, title: 'bleach', summmary: 'meh'},
  {id:14, title: 'one piece', summary: 'not bad'}
];

电影-list.components.ts

import { Component, OnInit } from '@angular/core';
import { Observable } from 'rxjs/Observable'
import { FilmService } from '../film.service';
import { Film } from "../film";

@Component({
  template: `
  <h1>List of Films</h1>
  <p>Films:</p>
  <ul>
    <li *ngFor="let film of films ">
     <a [routerLink]="['/films', film.id]">{{film.title}}</a>
      </li>
  </ul>
  <p *ngIf="films.length > 3">There are many vietnamese films to learn about!</p>
`,
  // important when adding to service other crashes
  providers: [FilmService]
})

//Component class
export class FilmListComponent implements OnInit {
  public films: Film[];
  constructor(private filmService: FilmService) {}

  getFilms(){
    this.filmService.getFilms().then((films: Film[]) => this.films = films);
  }

  ngOnInit():any {
    this.getFilms()
  }
}

所以我的目标是将我的模拟电影中的数据添加到我的电影列表中，但由于某种原因它没有出现。应该是电影-list.component.ts但不知道哪里出错了

Answer 1

修复这里

  public films: Film[]=[];

或

public films: Film[];
  constructor(private filmService: FilmService) {}
     getFilms(){
        this.flims=[];
        this.filmService.getFilms().then((films: Film[]) => this.films = films);
      }

电影-list.components.ts

import { Component, OnInit } from '@angular/core';
import { Observable } from 'rxjs/Observable'
import { FilmService } from '../film.service';
import { Film } from "../film";

@Component({
  template: `
  <h1>List of Films</h1>
  <p>Films:</p>
  <ul>
    <li *ngFor="let film of films ">
     <a [routerLink]="['/films', film.id]">{{film.title}}</a>
      </li>
  </ul>
  <p *ngIf="films.length > 3">There are many vietnamese films to learn about!</p>
`,
  // important when adding to service other crashes
  providers: [FilmService]
})

//Component class
export class FilmListComponent implements OnInit {

  public films: Film[];
  constructor(private filmService: FilmService) {}

  getFilms(){

    this.flims=[];//fix in here
    this.filmService.getFilms().then((films: Film[]) => this.films = films);
  }

  ngOnInit():any {
    this.getFilms()
  }
}

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