Question

以下是我的代码，我是谷歌地图和JavaScript的新手，我正试图获得“地名”和＃39;通过将位置（latlng）传递给地理编码器，但它没有返回任何值。如果将placeName var设置为＆＃39; somePlace＆＃39;它将标题设置为“somePlace＆＃39;”。但我想用返回值设置标题，即地名。

function setMap(position){
  //var Karachi = {lat: 24.8978176, lng: 66.9596003}; //default city
  var location = {
    lat: position.coords.latitude,
    lng: position.coords.longitude
  }

  var mapOptions = {

      center: location,
      zoom: 13,         //initial zoom level
      mapTypeId: 'hybrid'  //map type
  }
  //object of map
  var map = new google.maps.Map(document.getElementById('map'), mapOptions);

  var placeName;
  //placeName = 'SomePlace'; 
  var newLatLng = location + '';
  var latlngStr = newLatLng.split(',',2);
  var latlng = {lat: parseFloat(latlngStr[0]), lng:    parseFloat(latlngStr[1])};
  var geocoder = new google.maps.Geocoder({'location': latlng}, function(results, status) {
    if(status === 'OK'){
      if(results[1]){
        placeName = 'results[1].formatted_address';
      }
      else{
        window.alert('Error in ' + status);
      }
    }
    else{
      window.alert('Geocoder failed due to ' + status);
    }
  });

  var markerOptions = {
    position: location,
    map: map,
    title: placeName //<-- i want place name to be here

  }
  //object of marker
  var marker = new google.maps.Marker(markerOptions);
  marker.setTitle(placeName); //<-- this is also not working
}

Answer 1

只需尝试将你的lat和long传递给下面的查询字符串，你就会得到一个json数组，从那里获取你的地名。

http://maps.googleapis.com/maps/api/geocode/json?latlng=44.4647452,7.3553838&sensor=true

Answer 2

您的代码中存在语法错误。

您需要使用有效的google.maps.Geocoder对象调用GeocoderRequest <ul class="flex-container column"> <li class="flex-item">1</li> <li class="flex-item">2</li> <li class="flex-item">3</li> <li class="flex-item">4</li> <li class="flex-item">5</li> </ul>方法：

geocode

Geocoder是异步的，你需要在回调函数中使用返回的结果/何时可用：

var geocoder = new google.maps.Geocoder();
  geocoder.geocode({
    location: location
  }, function(results, status)

proof of concept fiddle

代码段

  if (results[1]) {
    placeName = results[1].formatted_address;
    var markerOptions = {
        position: location,
        map: map,
        title: placeName //<-- i want place name to be here

      }
      //object of marker
    var marker = new google.maps.Marker(markerOptions);

function setMap(position) {
  var location = {
    lat: position.coords.latitude,
    lng: position.coords.longitude
  }

  var mapOptions = {

    center: location,
    zoom: 13, //initial zoom level
    mapTypeId: 'hybrid' //map type
  }
  //object of map
  var map = new google.maps.Map(document.getElementById('map'), mapOptions);

  var geocoder = new google.maps.Geocoder();
  geocoder.geocode({
    location: location
  }, function(results, status) {
    if (status === 'OK') {
      if (results[1]) {
        placeName = results[1].formatted_address;
        var markerOptions = {
          position: location,
          map: map,
          title: placeName // set formatted_address as title of marker
        }
        //object of marker
        var marker = new google.maps.Marker(markerOptions);
      } else {
        window.alert('Error in ' + status);
      }
    } else {
      window.alert('Geocoder failed due to ' + status);
    }
  });
}
google.maps.event.addDomListener(window, "load", function() {
  setMap({
    coords: {
      latitude: 37.4419,
      longitude: -122.1419
    }
  })
});

html,
body,
#map {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

Google Maps JavaScript API V3 - Geocoder API未返回地名

2 个答案: