我创建了一个显示我的意思的plunker.描述我的“问题”有点困难.

组件中的html

<input *ngIf="filterShow.options"
       [focus]="filterFocus.options"
       [(ngModel)]="filter.options">

<button type="button"
        (click)="setShowFilter('options')">
  focus
</button>

setShowFilter()函数

private setShowFilter(filter: string) {
  this.filterShow[filter] = !this.filterShow[filter];

  /* reset filter */
  this.filter[filter] = "";

  this.filterFocus[filter].emit(true);
}

focus.directive.ts

@Directive({
  selector: '[focus]'
})
export class FocusDirective implements OnInit {

  @Input('focus') focusEvent: EventEmitter<boolean>;

  constructor(private elementRef : ElementRef,private renderer   : Renderer   ) { }

  ngOnInit() {
    this.focusEvent.subscribe(event => {
      this.renderer
        .invokeElementMethod(this.elementRef.nativeElement,'focus',[]);
    });
  }
}