储存Google Maps地理编码功能的结果 [英] Store result of Google Maps geocode function

问题描述

我想获取Google Maps API geocode()函数的结果，以便将其用于其他函数.我已将以下代码放在OnClick事件上，以对地址进行地理编码，以对地图上单击的点的地址进行地理编码.

I want to get the result of Google Maps API geocode() function in order to use it to other functions. I have put the code below on an OnClick event to reverse geocode the address of the point clicked on map.

总是单击先前的point值.例如:我第一次单击它具有未定义"，第二次具有它之前单击的点的地址，依此类推.

It is always having the previous value of point clicked. Example: the first time i click it has 'undefined', 2nd time it has the address of the point i clicked before and so on.

var address ;


my_listener = google.maps.event.addListener(map, 'click', function(event) {
   codeLatLng(event.latLng);
});

function codeLatLng(mylatLng) {

    geocoder = new google.maps.Geocoder();
    var latlng = mylatLng;

    geocoder.geocode({'latLng': latlng}, function(results, status) 
    {
        if (status == google.maps.GeocoderStatus.OK) 
        {
            if (results[1]) 
            {
                address = results[1].formatted_address;
            }
        }
    });
    alert(address);
}

推荐答案

如果要在回调内移动 alert ，则会看到新地址:

If you will move alert, inside of callback, you will see the new address:

geocoder.geocode({'latLng': latlng}, function(results, status) {
    if (status == google.maps.GeocoderStatus.OK) 
    {
        if (results[1]) 
        {
            address = results[1].formatted_address;
            alert(address);   //moved here
        }//   ^
    }//       |
});//         |  
//-------------

地理编码过程是异步，因此在这种情况下:

Geocoding process is asyncronous, so in this case:

geocoder.geocode({'latLng': latlng}, function(results, status) {
    //We be called after `alert(address);`
});
alert(address);

警报将在从服务器接收地理编码数据并调用回调 function(results，status){} 之前执行.

alert will be executed before the geocoding data will be recieved from server and callback function(results, status){} will be called.

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