通过指令回调函数

Question

我需要在* ngFor完成后调用该函数。为此，我会这样：

@Directive({
  selector:'[method]'
})
export class CallbackDirective implements OnDestroy{
  private called:boolean = false;
  @Input('method') method: Function;
  @Input('clause')
  set condition(value:any){
    if(!value || value == false) return;

    if(!this.called && this.method){
      this.method();
      this.called = true;
    }
  }

  constructor(){}
}

html

<div class="media" *ngFor="let item of items; let i = index; let last = last" [method]="navigate" [clause]="last">

组件代码

id:number;
constructor(){
  this.id = 0; //some value
}

navigate(){
  if(this.id)
    //do something
}

我有一个问题-调用“ navigate”的函数参数“ id”时未定义。如何在Navigation方法中获取值“ id”？