angular - Google Places API - Angular 2/Typescript/Ionic 2

Question

有没有人把这个转换成 typescript ？

  var map;
  var infowindow;

  function initMap() {
    var pyrmont = {lat: -33.867, lng: 151.195};

    map = new google.maps.Map(document.getElementById('map'), {
      center: pyrmont,
      zoom: 15
    });

    infowindow = new google.maps.InfoWindow();
    var service = new google.maps.places.PlacesService(map);
    service.nearbySearch({
      location: pyrmont,
      radius: 500,
      type: ['store']
    }, callback);
  }

  function callback(results, status) {
    if (status === google.maps.places.PlacesServiceStatus.OK) {
      for (var i = 0; i < results.length; i++) {
        createMarker(results[i]);
      }
    }
  }

  function createMarker(place) {
    var placeLoc = place.geometry.location;
    var marker = new google.maps.Marker({
      map: map,
      position: place.geometry.location
    });

    google.maps.event.addListener(marker, 'click', function() {
      infowindow.setContent(place.name);
      infowindow.open(map, this);
    });
  }

我尝试自己转换它，如下所示，但我在控制台中收到一个错误，我将在代码下方显示，如果有人能提醒我哪里出错了，那就太好了

  constructor(public navCtrl: NavController, private navParams: NavParams, private ngZone: NgZone) {}

  ionViewDidLoad() {
    console.log('ionViewDidLoad DetailsPage');
    this.loadMap();
  }

  @ViewChild('map') mapElement: ElementRef;
  map: any;

  loadMap(){

    Geolocation.getCurrentPosition().then((position) => {

      let latLng = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);

      let mapOptions = {
        center: latLng,
        zoom: 15,
        mapTypeId: google.maps.MapTypeId.ROADMAP
      }

      this.map = new google.maps.Map(this.mapElement.nativeElement, mapOptions);

      let service = new google.maps.places.PlacesService(mapOptions);

      service.nearbySearch({
        location: latLng,
        radius: 500,
        type: ['pub']
      }, (results, status) => {
          this.callback(results, status)
      });

    }, (err) => {
      console.log(err);
    });

  }

  callback(results, status) {
    if (status === google.maps.places.PlacesServiceStatus.OK) {
      for (var i = 0; i < results.length; i++) {
        this.createMarker(results[i]);
      }
    }
  }

  createMarker(place){
    var placeLoc = place.geometry.location;
    var marker = new google.maps.Marker({
        map: this.map,
        position: place.geometry.location
    });

    let infowindow = new google.maps.InfoWindow();

    google.maps.event.addListener(marker, 'click', () => {
      this.ngZone.run(() => {
        infowindow.setContent(place.name);
        infowindow.open(this.map,this);
      });
    });
  }

  addMarker(){

    let marker = new google.maps.Marker({
      map: this.map,
      animation: google.maps.Animation.DROP,
      position: this.map.getCenter()
    });

    let content = "<h4>You are here!</h4>";          

    this.addInfoWindow(marker, content);

  }

  addInfoWindow(marker, content){

    let infoWindow = new google.maps.InfoWindow({
      content: content
    });

    google.maps.event.addListener(marker, 'click', () => {
      this.ngZone.run(() => {
        infoWindow.open(this.map, marker);
      });
    });
  }

控制台错误

Uncaught TypeError: this.b.getElementsByTagName is not a function
    at B5.attributionText_changed (places_impl.js:28)
    at zb (js?key=AIzaSyAZTATsl9JjVKodXRnzeSk52Ndvtz-HPPU&libraries=places:36)
    at B5._.y.bindTo (js?key=AIzaSyAZTATsl9JjVKodXRnzeSk52Ndvtz-HPPU&libraries=places:104)
    at Object.f6.f (places_impl.js:38)
    at Hw.<anonymous> (js?key=AIzaSyAZTATsl9JjVKodXRnzeSk52Ndvtz-HPPU&libraries=places:137)
    at js?key=AIzaSyAZTATsl9JjVKodXRnzeSk52Ndvtz-HPPU&libraries=places:105
    at Object.<anonymous> (js?key=AIzaSyAZTATsl9JjVKodXRnzeSk52Ndvtz-HPPU&libraries=places:37)
    at js?key=AIzaSyAZTATsl9JjVKodXRnzeSk52Ndvtz-HPPU&libraries=places:105
    at js?key=AIzaSyAZTATsl9JjVKodXRnzeSk52Ndvtz-HPPU&libraries=places:37
    at js?key=AIzaSyAZTATsl9JjVKodXRnzeSk52Ndvtz-HPPU&libraries=places:105

特别是在控制台文件中突出显示。

b.getElementsByTagName("a"),c=0;c<_.w(b);c++)b[c].style.color="#444";this.H&&this.H.set("placesDataProviders",a)};B5.prototype.hide_changed=function(){_.kA(this.b,!this.get("hide"))};_.t(D5,_.y);_.k=D5.prototype;_.k.input_changed=function(){window.clearTimeout(this.f);this.f=window.setTimeout((0,_.p)(this.Ol,this),100)};_.k.Ol=function(){var a=this.l,b=this.Lb();a!=b&&(H5(this),this.l=b);this.f=null};_.k.Jm=function(){if(this.Tc())J5(this,this.Lb());else{var a={name:this.Lb()};this.Ef(a)}};

Answer 1

如果您添加这样的回调函数，this 上下文将丢失。有多种方法可以解决这个问题。一种是使用匿名函数包装器:

service.nearbySearch({
  location: latLng,
  radius: 500,
  type: ['pub']
}, (results, status) => {
  this.callback(results, status);
});

另请注意，当您使用 google.maps 中的 addListener 调用时，不会触发更改检测周期。检查这个answer想要查询更多的信息。您可能会在使用 addInfoWindow 函数时遇到该问题:

@Component({
    selector : 'maps-test',
    template : '<div #map></div>'
})
export class MapsTestComponent {

  @ViewChild('map')
  mapElement: ElementRef;

  constructor(private ngZone: NgZone){}

  ngAfterViewInit() {
      loadMap();
  }

  loadMap(){

    Geolocation.getCurrentPosition().then((position) => {

      let latLng = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);

      let mapOptions = {
        center: latLng,
        zoom: 15,
        mapTypeId: google.maps.MapTypeId.ROADMAP
      }

      this.map = new google.maps.Map(this.mapElement.nativeElement, mapOptions);

            let service = new google.maps.places.PlacesService(this.map);


      service.nearbySearch({
        location: latLng,
        radius: 500,
        type: ['pub']
      }, (results, status) => {
          this.callback(results, status)
      });

    }, (err) => {
      console.log(err);
    });

  }

  callback(results, status) {
    if (status === google.maps.places.PlacesServiceStatus.OK) {
      for (var i = 0; i < results.length; i++) {
        this.createMarker(results[i]);
      }
    }
  }

  createMarker(place){
    var placeLoc = place.geometry.location;
    var marker = new google.maps.Marker({
        map: this.map,
        position: place.geometry.location
    });

    let infowindow = new google.maps.InfoWindow();

    google.maps.event.addListener(marker, 'click', () => {
      this.ngZone.run(() => {
        infowindow.setContent(place.name);
        infowindow.open(this.map,this);
      });
    });
  }

  addMarker(){

    let marker = new google.maps.Marker({
      map: this.map,
      animation: google.maps.Animation.DROP,
      position: this.map.getCenter()
    });

    let content = "<h4>You are here!</h4>";          

    this.addInfoWindow(marker, content);

  }

  addInfoWindow(marker, content){

    let infoWindow = new google.maps.InfoWindow({
      content: content
    });

    google.maps.event.addListener(marker, 'click', () => {
      this.ngZone.run(() => {
        infoWindow.open(this.map, marker);
      });
    });
  }
}