谷歌地图-GMaps显示标记



我正试图从MySql数据库加载标记(我使用了一个php文件,该文件转换了提供xml输出的数据),但我只看到了映射。在阅读了StackOverflow上的帖子后,我仍然不知道如何让它发挥作用。

<!DOCTYPE html>
<html>
<head>
<script src="http://maps.googleapis.com/maps/api/js?key=AIzaSyDY0kkJiTPVd2U7aTOAwhc9ySH6oHxOIYM&sensor=true"></script>
</head>
<body>
<script>
function initialize()
{
var map=new google.maps.Map(document.getElementById("mapka"), {
    center:new google.maps.LatLng(51.109612,17.036276),
    zoom:12,
    mapTypeId:google.maps.MapTypeId.ROADMAP
});
    downloadUrl("dane.php", function(data)
    {
    var xml = data.responseXML;
    var markers = xml.documentElement.getElementsByTagName("marker");
    for (var i = 0; i < markers.length; i++)
    {
        var nazwa = markers[i].getAttribute("nazwa");
        var lat = parseFloat(markers[i].getAttribute("lat"));
        var lng = parseFloat(markers[i].getAttribute("lng"));
        var point = new google.maps.LatLng(lat,lng);
        var marker = new google.maps.Marker({
        map: map,
        position: point
        });
    }
});
}
function downloadUrl(url, callback) {
  var request = window.ActiveXObject ?
      new ActiveXObject('Microsoft.XMLHTTP') :
      new XMLHttpRequest;
  request.onreadystatechange = function() {
    if (request.readyState == 4) {
      request.onreadystatechange = doNothing;
      callback(request, request.status);
    }
  };
  request.open('GET', url, true);
  request.send(null);
}
function doNothing() {}

google.maps.event.addDomListener(window, 'load', initialize);
</script>
<div id="mapka" style="width:700px;height:500px;"></div>
</body>
</html>

XML如下所示:

<dane>
    <marker lat="51.110287" lon="17.062647" nazwa="Hello_1" address="Street_1"/>
    <marker lat="51.111807" lon="17.058012" nazwa="Hello_2" address="Street_2"/>
</dane>

您试图访问属性lng,但为XML内部的标记定义的属性是lon

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