如何在ngFor中将对象作为组件输入传递

Question

我正在尝试迭代一组Audio对象(包含3个字符串)并将每次迭代中的音频传递给子组件.

app.component.ts

ngOnInit(){
    this.audios = new Array<SoundBoardAudio>();
    this.audios.push(new SoundBoardAudio('Western','La canción del Sheriff.','western.mp3'));
    this.audios.push(new SoundBoardAudio('Olvidelo Amigo','Busquese otro tonto amigo.','olvidelo_amigo.mp3'));
  }

app.component.html

 <div class="container">
      <app-soundcard *ngFor="let audio of audios" soundBoardAudio=audio></app-soundcard>
    </div>

soundboard.component.ts

export class SoundcardComponent implements OnInit {

  audio:any;

  constructor() {}

  @Input() soundBoardAudio;

  ngOnInit() {
    console.log(this.soundBoardAudio);
    let audioSrc = 'assets/audio/'+this.soundBoardAudio.filename;
    this.audio = new Audio(audioSrc);
  }
...

soundboard.component.html

<div class="card" >
  <div class="card-block">
    <h2 class="card-title">{{soundBoardAudio.name}}</h2>
    <p>{{soundBoardAudio.desc}}
  </div>
...

但是当我尝试从子组件中读取音频时,我得到一个未定义的值.如果我只传递一个字符串而不是一个对象,它可以正常工作.

Answer 1

父html中的输入语法不正确.这样做:

<div class="container">
  <app-soundcard *ngFor="let audio of audios" [soundBoardAudio]="audio"></app-soundcard>
</div>