反向地理编码器返回未定义 [英] Reverse Geocoder Returning undefined

问题描述

因此，我使用谷歌的反向地理编码器，所以我最初做的是输入一个地址，如东京，然后我得到latlng latlng并将其放回地理编码器以接收位置的专有名称，但相反，它只是返回undefined。我的代码是：

  var geocoder = new google.maps.Geocoder（）; 
 var place = document.getElementById（location）。value; 
 var name; 
 var place_latlng; 
 geocoder.geocode（{'address'：place}，function（results，status）{
 if（status == google.maps.GeocoderStatus.OK）{
 place_latlng = results [0 ] .geometry.location; 
 addMarker（place_latlng）; 
} 
}）; 
 geocoder.geocode（{'latLng'：place_latlng}，function（results，status）{
 if（status == google.maps.GeocoderStatus.OK）{
 name = results [0 ] .formatted_address; 
} 
}）; 
  

名字每次都会被定义为undefined，有没有办法解决这个问题？

解决方案

Geocoder是异步的，您需要使用Geocoder在其回调函数（未测试）中返回的数据：

  geocoder.geocode（{'address'：place}，function（results，status）{
 if（status == google.maps .GeocoderStatus.OK）{
 place_latlng = results [0] .geometry.location; 
 addMarker（place_latlng）; 
 geocoder.geocode（{'latLng'：place_latlng}，function（results，状态）{
 if（status == google.maps.GeocoderStatus.OK）{
 name = results [0] .formatted_address; 
 alert（name =+ name）; 
} else {alert（反向地理编码为+ place_latlng +失败（+ status +））;} 
}）; 
} else {alert（geocode of+ place +failed （+ status +））;} 
}）; 
  

示例

So, I am using google's reverse geocoder, so what I originally do is enter an address such as, tokyo, then I get that latlng take the latlng and place it back into the geocoder to receive the proper name of the location but instead it just returns undefined. My code is:

var geocoder = new google.maps.Geocoder();
var place = document.getElementById("location").value;
var name;
var place_latlng;
geocoder.geocode({'address' : place}, function(results, status){
  if (status == google.maps.GeocoderStatus.OK){
    place_latlng = results[0].geometry.location;
    addMarker(place_latlng);
  }
});
geocoder.geocode({'latLng' : place_latlng},function(results, status){
  if (status == google.maps.GeocoderStatus.OK){
    name = results[0].formatted_address;
  }
});

name ends up being undefined every time, is there a way I can fix this?

解决方案

The Geocoder is asynchronous, you need to use the data returned by the Geocoder inside its callback function (not tested):

geocoder.geocode({'address' : place}, function(results, status){
  if (status == google.maps.GeocoderStatus.OK){
    place_latlng = results[0].geometry.location;
    addMarker(place_latlng);
    geocoder.geocode({'latLng' : place_latlng},function(results, status){
      if (status == google.maps.GeocoderStatus.OK){
        name = results[0].formatted_address;
        alert("name = "+name);
      } else { alert("reverse geocode of "+place_latlng+ " failed ("+status+")"); }
    });
  } else { alert("geocode of "+place+" failed ("+status+")"); }
});

Example

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