使用Google maps API v3如何获取具有给定地址的LatLng？

Question

如果用户输入地址,我想转换为等效的LatLng.

我已经阅读了文档,我想我可以使用Geocoder类来做到这一点,但无法弄清楚如何实现它.

谢谢你的帮助!

Answer 1

https://developers.google.com/maps/documentation/javascript/examples/geocoding-simple上有一个很好的例子

要缩短一点:

geocoder = new google.maps.Geocoder();

function codeAddress() {

    //In this case it gets the address from an element on the page, but obviously you  could just pass it to the method instead
    var address = document.getElementById( 'address' ).value;

    geocoder.geocode( { 'address' : address }, function( results, status ) {
        if( status == google.maps.GeocoderStatus.OK ) {

            //In this case it creates a marker, but you can get the lat and lng from the location.LatLng
            map.setCenter( results[0].geometry.location );
            var marker = new google.maps.Marker( {
                map     : map,
                position: results[0].geometry.location
            } );
        } else {
            alert( 'Geocode was not successful for the following reason: ' + status );
        }
    } );
}

Answer 2

我不认为location.LatLng是有效的,但这有效:

results[0].geometry.location.lat(), results[0].geometry.location.lng()

在探索Get Lat Lon源代码时找到它.

Answer 3

如果需要在后端执行此操作,可以使用以下URL结构:

https://maps.googleapis.com/maps/api/geocode/json?address=STREET_ADDRESS

使用curl示例PHP代码:

$curl = curl_init();

curl_setopt($curl, CURLOPT_URL, 'https://maps.googleapis.com/maps/api/geocode/json?address=' . rawurlencode($address));

curl_setopt ($curl, CURLOPT_RETURNTRANSFER, 1);

$json = curl_exec($curl);

curl_close ($curl);

有关详细信息,请参阅其他文档

文档提供了示例输出,可帮助您获取自己的API密钥,以便能够向Google Maps Geocoding API发出请求.