利用ajax根据地图的视图选择性的显示标记
<html xmlns:v="urn:schemas-microsoft-com:vml">
<meta http-equiv="content-type" content="text/html; charset=GB2312"/>
<meta name="keywords" content="大同巴士快车,大同地图,LTAjax.loadRemoteXml,JavaScript,灵图,51ditu Javascript API AJAX范例文档,地图,范例文档"/?>
<title>大同地图展示</title>
<style type="text/css">v\:*{behavior:url(#default#VML);}</style>
<script language="javascript" src=" [url]http://api.51ditu.com/js/maps.js[/url]"></script>
<script language="javascript" src=" [url]http://api.51ditu.com/js/ajax.js[/url]"></script>
<meta name="keywords" content="大同巴士快车,大同地图,LTAjax.loadRemoteXml,JavaScript,灵图,51ditu Javascript API AJAX范例文档,地图,范例文档"/?>
<title>大同地图展示</title>
<style type="text/css">v\:*{behavior:url(#default#VML);}</style>
<script language="javascript" src=" [url]http://api.51ditu.com/js/maps.js[/url]"></script>
<script language="javascript" src=" [url]http://api.51ditu.com/js/ajax.js[/url]"></script>
<script language="javascript">
var maps;
var moveLsitener;
var maps;
var moveLsitener;
function InitAjax()
{
var ajax=false;
try {
ajax = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
ajax = new ActiveXObject("Microsoft.XMLHTTP");
} catch (E) {
ajax = false;
}
}
if (!ajax && typeof XMLHttpRequest!='undefined') {
ajax = new XMLHttpRequest();
}
return ajax;
}
function onDblClick()//定义在双击的时候执行的函数
{
moveLsitener=LTEvent.addListener(maps,"moveend",onMoveEnd);
//因为系统默认双击的时候会将地图定位到中心，因此，只需要定义地图在定位到中心完成之后放大地图即可
}
function onMoveEnd(point)//定义地图在定位到中心完成之后执行的函数
{
LTEvent.removeListener(moveLsitener); //删除事件注册
maps.zoomIn(); //放大地图
//***********自动执行showLatLng()**************
}
function dispMarker(points,nam){
var marker = new LTMarker( points );
marker.enableDrag();
maps.addOverLay( marker );
var text =new LTMapText(marker);//建立地图文本对象
text.setLabel( nam );
maps.addOverLay(text);
}
function showLatLng()
{
maps.clearOverLays();//移除地图上的所有标注
var msg = document.getElementById("msg");
var cZoom = maps.getCurrentZoom();
var bounds = maps.getBoundsLatLng();
{
var ajax=false;
try {
ajax = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
ajax = new ActiveXObject("Microsoft.XMLHTTP");
} catch (E) {
ajax = false;
}
}
if (!ajax && typeof XMLHttpRequest!='undefined') {
ajax = new XMLHttpRequest();
}
return ajax;
}
function onDblClick()//定义在双击的时候执行的函数
{
moveLsitener=LTEvent.addListener(maps,"moveend",onMoveEnd);
//因为系统默认双击的时候会将地图定位到中心，因此，只需要定义地图在定位到中心完成之后放大地图即可
}
function onMoveEnd(point)//定义地图在定位到中心完成之后执行的函数
{
LTEvent.removeListener(moveLsitener); //删除事件注册
maps.zoomIn(); //放大地图
//***********自动执行showLatLng()**************
}
function dispMarker(points,nam){
var marker = new LTMarker( points );
marker.enableDrag();
maps.addOverLay( marker );
var text =new LTMapText(marker);//建立地图文本对象
text.setLabel( nam );
maps.addOverLay(text);
}
function showLatLng()
{
maps.clearOverLays();//移除地图上的所有标注
var msg = document.getElementById("msg");
var cZoom = maps.getCurrentZoom();
var bounds = maps.getBoundsLatLng();
var bndstr = bounds.getXmin()+","+bounds.getYmin()+", "+bounds.getXmax()+","+bounds.getYmax();
var cPoint = maps.getCenterPoint();
//msg.innerHTML= "地图中心点坐标:"+cPoint.getLongitude()+","+cPoint.getLatitude()+","+cZoom+". 范围: "+bndstr+"<br>";
var cPoint = maps.getCenterPoint();
//msg.innerHTML= "地图中心点坐标:"+cPoint.getLongitude()+","+cPoint.getLatitude()+","+cZoom+". 范围: "+bndstr+"<br>";
var ajax = InitAjax();
var goUrl = " [url]http://ditu.dtbus.com/lnglat.php[/url]";
var postStr = "bndstr=" + bndstr +"&cZoom="+ cZoom;
ajax.open("POST", goUrl, true);
ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
ajax.send(postStr);
ajax.onreadystatechange = function() {
if (ajax.readyState == 4 && ajax.status == 200) {
//msg.innerHTML=ajax.responseText;
var pstrs = ajax.responseText.split("<br>");
for(i=0; i<pstrs.length; i++){
var pr = pstrs[i].split(",")
dispMarker(new LTPoint(pr[0],pr[1]) , pr[2]); //pr[2]:名称
}
}
}
}
function onLoad()
{
maps=new LTMaps("mapDiv");
maps.centerAndZoom( "datong" , 8 );
maps.addControl(new LTStandMapControl());
showLatLng(); //第一次
LTEvent.addListener(maps,"dblclick",onDblClick); //双击地图事件
LTEvent.addListener(maps,"moveend",showLatLng); //在地图有变化的时候显示新的经纬度
LTEvent.addListener(maps,"zoom",showLatLng); //在地图有变化的时候显示新的经纬度
var goUrl = " [url]http://ditu.dtbus.com/lnglat.php[/url]";
var postStr = "bndstr=" + bndstr +"&cZoom="+ cZoom;
ajax.open("POST", goUrl, true);
ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
ajax.send(postStr);
ajax.onreadystatechange = function() {
if (ajax.readyState == 4 && ajax.status == 200) {
//msg.innerHTML=ajax.responseText;
var pstrs = ajax.responseText.split("<br>");
for(i=0; i<pstrs.length; i++){
var pr = pstrs[i].split(",")
dispMarker(new LTPoint(pr[0],pr[1]) , pr[2]); //pr[2]:名称
}
}
}
}
function onLoad()
{
maps=new LTMaps("mapDiv");
maps.centerAndZoom( "datong" , 8 );
maps.addControl(new LTStandMapControl());
showLatLng(); //第一次
LTEvent.addListener(maps,"dblclick",onDblClick); //双击地图事件
LTEvent.addListener(maps,"moveend",showLatLng); //在地图有变化的时候显示新的经纬度
LTEvent.addListener(maps,"zoom",showLatLng); //在地图有变化的时候显示新的经纬度
}
</script>
</script>
<body onload="onLoad()">
<!--创建一个DIV-->
<div id="mapDiv" style="position:relative; width:700px; height:550px; border:black solid 1px;">
<div align="center" style="margin:12px;">
<a href=" [url]http://api.51ditu.com/docs/mapsapi/help.html[/url]" target="_blank" style="color:#D01E14;font-weight:bolder;font-size:12px;">看不到地图请点这里</a>
</div></div>
<!--创建一个DIV-->
<div id="mapDiv" style="position:relative; width:700px; height:550px; border:black solid 1px;">
<div align="center" style="margin:12px;">
<a href=" [url]http://api.51ditu.com/docs/mapsapi/help.html[/url]" target="_blank" style="color:#D01E14;font-weight:bolder;font-size:12px;">看不到地图请点这里</a>
</div></div>
<div id="msg"></div>
程序演示:[url]http://cnc.dtbus.com[/url]