如何從Google Map API函數中獲取javascript lat/lng變量

Question

我需要從Postcode中獲取Lat/Lng，因此我使用Google Map/Geocode API。

我無法從Geocode腳本中運行的函數中獲取緯度/經度變量。我使用的代碼如下：

<input id="address" type="textbox" value=""> 
<script type="text/javascript"> 
var lat; 
var lng; 
function addressurls(address) { 
var address = document.getElementById("address").value; 
var geocoder = new google.maps.Geocoder(); 
geocoder.geocode({'address': address}, function postcodesearch(results, status) 
{ 
    if (status == google.maps.GeocoderStatus.OK) 
    { 
    var lat = results[0].geometry.location.lat(); 
    var lng = results[0].geometry.location.lng(); 
    } 
    else { 
    alert("Error"); 
    } 
    return lat; 
    return lng; 
}); 
var laturl = "&lat="; 
var lonurl = "&lon="; 
var postcode = document.getElementById("address").value; 
var addressurl = "/distributors-search?address=" + postcode + laturl + lat+ lonurl + lng; 
parent.location=addressurl; 
} 
</script> 
<input type="button" value="Encode" onclick="addressurls('address'), parent.location=addressurl"> 

有誰知道如何解決它？

Answer 1

地理編碼是異步的，則需要在回調函數中使用返回的數據

<input id="address" type="textbox" value=""> 
<script type="text/javascript"> 
var lat; 
var lng; 
function addressurls(address) { 
var address = document.getElementById("address").value; 
var geocoder = new google.maps.Geocoder(); 
geocoder.geocode({'address': address}, function postcodesearch(results, status) 
{ 
    if (status == google.maps.GeocoderStatus.OK) 
    { 
    var lat = results[0].geometry.location.lat(); 
    var lng = results[0].geometry.location.lng(); 
    var laturl = "&lat="; 
    var lonurl = "&lon="; 
    var postcode = document.getElementById("address").value; 
    var addressurl = "/distributors-search?address=" + postcode + laturl + lat+ lonurl + lng; 
    parent.location=addressurl; 
    } 
    else { 
    alert("Error"); 
    } 
}); 

} 
</script> 
<input type="button" value="Encode" onclick="addressurls('address'), parent.location=addressurl">