用于谷歌地图的 Angular 2 agm 库按地点 ID 设置地点

Question

我正在一个页面中实现一个谷歌地图，其中一个地点 ID 传递给我，然后我需要获取这样的地点 ID 并使用该标记加载地图。我正在阅读文档，但不清楚如何从<agm-map> 标记定位地图对象，以便我可以设置地点 ID。以下是部分代码：

  public latitude: number;
  public longitude: number;
  public zoom: number;
  public placeid: string;

  constructor(
    private mapsAPILoader: MapsAPILoader,
    private ngZone: NgZone
  ) {}

  ngOnInit() {
      //set google maps defaults
      this.zoom = 4;
      this.latitude = 39.8282;
      this.longitude = -98.5795;
      this.placeid = "ChIJMS2FahDQzRIRcJqX_aUZCAQ";

      //set current position
      this.setCurrentPosition();

      this.mapsAPILoader.load().then(() => {
            //How do i set the agm-map here to load the map with the placeid

      });
    }

    private setCurrentPosition() {
      if ("geolocation" in navigator) {
        navigator.geolocation.getCurrentPosition((position) => {
          this.latitude = position.coords.latitude;
          this.longitude = position.coords.longitude;
          this.zoom = 12;
        });
      }
    }

然后在 html 文件中我有这样的内容：

<agm-map [latitude]="latitude" [longitude]="longitude" [scrollwheel]="false" [zoom]="zoom">
      <agm-marker [latitude]="latitude" [longitude]="longitude"></agm-marker>
</agm-map>

我查看了 GOOGLE 文档，它似乎设置了您需要这样的地点 ID

var request = {
  placeId: 'ChIJN1t_tDeuEmsRUsoyG83frY4'
};

service = new google.maps.places.PlacesService(map);
service.getDetails(request, callback);

function callback(place, status) {
  if (status == google.maps.places.PlacesServiceStatus.OK) {
    createMarker(place);
  }
}

我的问题是我不确定要为map 传递什么，因为我使用的是<agm-map>。

Answer 1

您可以使用agm-map 的mapReady 输出属性。将您的 html 更改为

<agm-map [latitude]="latitude" [longitude]="longitude" [scrollwheel]="false" [zoom]="zoom" (mapReady)="mapReady($event)">
      <agm-marker [latitude]="latitude" [longitude]="longitude"></agm-marker>
</agm-map>

并在您的组件中定义以下功能。当您的地图准备就绪时，将调用此函数。

mapReady($event: any) { 
  // here $event will be of type google.maps.Map 
  // and you can put your logic here to get lat lng for marker. I have just put a sample code. You can refactor it the way you want.
  this.getLatLong('ChIJN1t_tDeuEmsRUsoyG83frY4', $event, null);
}

getLatLong(placeid: string, map: any, fn) {
    let placeService = new google.maps.places.PlacesService(map);
    placeService.getDetails({
      placeId: placeid
      }, function (result, status) {
        console.log(result.geometry.location.lat());
        console.log(result.geometry.location.lng())
      });
  }

根据您的需要更改/重构此示例代码，以便您能够为要传递给 html 的纬度和经度参数设置值。

<agm-marker [latitude]="latitude" [longitude]="longitude"></agm-marker>