将城市/州从SQL Server加载到谷歌地图？
kna*_*ejj 6 javascript sql-server coldfusion google-maps geocoding
我正在尝试创建一个小型应用程序,它将城市和州以及地理位置解析为纬度/经度.现在我正在使用Google Map的API,ColdFusion和SQL Server.基本上,城市和州的字段都在数据库表格中,我想要获取这些位置并将标记放在谷歌地图上,以显示它们的位置.
这是我执行地理编码的代码,查看页面源代码显示它正确循环查询并在地址字段中放置位置("奥马哈,NE"),但没有标记或地图,正在页面上显示:
function codeAddress() {
<cfloop query="GetLocations">
var address = document.getElementById(<cfoutput>#Trim(hometown)#,#Trim(state)#</cfoutput>).value;
if (geocoder) {
geocoder.geocode( {<cfoutput>#Trim(hometown)#,#Trim(state)#</cfoutput>: address}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
var marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location,
title: <cfoutput>#Trim(hometown)#,#Trim(state)#</cfoutput>
});
} else {
alert("Geocode was not successful for the following reason: " + status);
}
});
}
</cfloop> }
以下是初始化地图的代码:
var geocoder;
var map;
function initialize() {
geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(42.4167,-90.4290);
var myOptions = {
zoom: 5,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var marker = new google.maps.Marker({
position: latlng,
map: map,
title: "Test"
});
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
}
我确实有一个地图工作,使用硬编码到数据库表中的lat/long,但我希望能够只使用城市/州并将其转换为纬度/经度.有什么建议或指示吗？将lat/long存储在数据库中也是可能的,但我不知道如何在SQL中执行此操作.
您可能需要考虑以下示例：
使用V2 API：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps API Geocoding Demo</title>
<script src="http://maps.google.com/maps?file=api&v=2&sensor=false"
type="text/javascript"></script>
</head>
<body onunload="GUnload()">
<div id="map_canvas" style="width: 400px; height: 300px"></div>
<script type="text/javascript">
// Prepare this list from ColdFusion
var locations = [
'New York, NY',
'Los Angeles, CA',
'Chicago, IL',
'Houston, TX',
'Phoenix, AZ'
];
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map_canvas"));
var geocoder = new GClientGeocoder();
var index = 0;
var geocoderFunction = function () {
geocoder.getLatLng(locations[index], function (point) {
if (point) {
map.addOverlay(new GMarker(point));
}
// Call the geocoder with a 100ms delay
index++;
if (locations.length > index) {
setTimeout(geocoderFunction, 100);
}
});
}
map.setCenter(new GLatLng(38.00, -100.00), 3);
// Launch the geocoding process
geocoderFunction();
}
</script>
</body>
</html>
使用V3 API：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps API Geocoding Demo</title>
<script src="http://maps.google.com/maps/api/js?sensor=false"
type="text/javascript"></script>
</head>
<body>
<div id="map_canvas" style="width: 400px; height: 300px"></div>
<script type="text/javascript">
// Prepare this list from ColdFusion
var locations = [
'New York, NY',
'Los Angeles, CA',
'Chicago, IL',
'Houston, TX',
'Phoenix, AZ'
];
var mapOpt = {
mapTypeId: google.maps.MapTypeId.TERRAIN,
center: new google.maps.LatLng(38.00, -100.00),
zoom: 3
};
var map = new google.maps.Map(document.getElementById("map_canvas"), mapOpt);
var geocoder = new google.maps.Geocoder();
var index = 0;
var geocoderFunction = function () {
geocoder.geocode({ 'address': locations[index] }, function (results, status) {
if (status == google.maps.GeocoderStatus.OK) {
new google.maps.Marker({
map: map,
position: results[0].geometry.location
});
}
// Call the geocoder with a 100ms delay
index++;
if (locations.length > index) {
setTimeout(geocoderFunction, 100);
}
});
}
// Launch the geocoding process
geocoderFunction();
</script>
</body>
</html>
您所需要做的就是从 ColdFusion 渲染 JavaScript 数组locations，而不是使用示例中的硬编码数组。
上面示例的屏幕截图：
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