angular - google maps places autocomplete addEventListener 不起作用

Question

我一直在尝试在 ionic 2 项目中添加 google maps places auto complete 以更新用户位置。但是，addEventListener 似乎不起作用并且没有控制台错误有人可以告诉我哪里出错了吗？

 ngAfterViewInit() {
   let input = < HTMLInputElement > document.getElementById("auto");
   console.log('input', input);
   let options = {
     componentRestrictions: {
       country: 'IN',
       types: ['(regions)']
     }
   }
   let autoComplete = new google.maps.places.Autocomplete(input, options);
   console.log('auto', autoComplete);
   google.maps.event.addListener(autoComplete, 'place_changed', function() {
     this.location.loc = autoComplete.getPlace();
     console.log('place_changed', this.location.loc);
   });
 }

<ion-label stacked>Search Location</ion-label>
<input type="text" id="auto" placeholder="Enter Search Location" [(ngModel)]="location.loc" />

index.html

<script src="https://maps.googleapis.com/maps/api/js?key=xxxxxxxxxxxxxx&libraries=places"></script>

Answer 1

您可以使用箭头函数来保留 this 和 ChangeDetectionRef 来检测更改，因为 google map 事件是在 Angular 区域之外触发的:

constructor(private cd: ChangeDetectorRef) { }

google.maps.event.addListener(autoComplete, 'place_changed', () => { // arrow function
  this.location.loc = autoComplete.getPlace();
  this.cd.detectChanges(); // detect changes
  console.log('place_changed', this.location.loc);
});

autoComplete.getPlace(); 返回Object，所以你可以获取如下地址:

var place =  autoComplete.getPlace();
this.location.loc = place.formatted_address;

Plunker Example