javascript-更改检测在Angular 2中的指令事件输出中不起作用

我使用此指令.但是,在setAddress事件输出中,在我的组件中未检测到任何更改.该视图未更新.我不明白

为了进行测试,如果我删除了google.maps.event.addListener,将其替换为一个简单的setTimeout来调用invokeEvent.有用.

@Directive({
  selector: '[googleplace]',
  providers: [NgModel],
  host: {
    '(input)' : 'onInputChange()'
  }
})
export class GoogleplaceDirective  {
  @Output() setAddress: EventEmitter<any> = new EventEmitter();
  modelValue:any;
  autocomplete:any;
  private _el:HTMLElement;


  constructor(el: ElementRef,private model:NgModel) {
    this._el = el.nativeElement;
    this.modelValue = this.model;
    var input = this._el;
    this.autocomplete = new google.maps.places.Autocomplete(input, {});
    google.maps.event.addListener(this.autocomplete, 'place_changed', ()=> {
      var place = this.autocomplete.getPlace();
      this.invokeEvent(place);
    });
  }

  invokeEvent(place:Object) {
    this.setAddress.emit(place);
  }


  onInputChange() {
  }
}

在我的组件视图中

<input type="text" class="validation-address-input" style="margin-top: 100px;" [value]="form.customerAddress"
               (setAddress)="setCustomStartLocation($event)" googleplace>

在我的组件中

/**
     *
     * @param place
     */
    setCustomStartLocation(place: Object) {
        this.currentStep = 2;
    }

解决方法:

place_changed的处理程序在角度区域外运行.您需要像这样运行它：

constructor(..., private zone: ngzone) {
  ...
  google.maps.event.addListener(this.autocomplete, 'place_changed', ()=> {
    var place = this.autocomplete.getPlace();
    this.zone.run(() => this.invokeEvent(place)); // run inside angular zone
  });