无限级联动菜单-AJAX版（附源码下载）

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta content="琥珀[hopesoft],http://www.10090.com" name="author">
<title>琥珀网 - 无限级联动菜单[AJAX版]</title>
<style type="text/css">
body, td
{
font-family: 宋体;
font-size: 12px;
}
</style>
<script language="JavaScript">
function GetResult(str,classid)
{
/*
*--------------- GetResult(str,classid) -----------------
* GetResult(str)
* 功能:通过XMLHTTP发送请求,返回结果.
* 参数:str,字符串,发送条件;classid,数字,菜单级别
* 实例:GetResult(document.all.userid.value,1);
*--------------- GetResult(str,classid) -----------------
*/
//定义菜单级数，菜单ID数组，菜单对应字段数组
var MenuIdArr,MenuFieldArr,MenuClass
MenuIdArr= new Array()
MenuFieldArr=new Array()
MenuClass=4

MenuIdArr[1]="sel1"
MenuIdArr[2]="sel2"
MenuIdArr[3]="sel3"
MenuIdArr[4]="sel4"

MenuFieldArr[1]="name"
MenuFieldArr[2]="name"
MenuFieldArr[3]="name"
MenuFieldArr[4]="name"

if (window.XMLHttpRequest) { // Mozilla, Safari, ...
http_request = new XMLHttpRequest();
} else if (window.ActiveXObject) { // IE
http_request = new ActiveXObject("Microsoft.XMLHTTP");
}

var linkurl="ajax_server.asp?classid="+classid+"&sel="+str+"&fieldname="+MenuFieldArr[classid+1]
http_request.open("GET",linkurl,false);
http_request.send(null);

//服务器端处理返回的是经过escape编码的字符串.
//在页面显示服务器查询结果

var returntxt=unescape(http_request.responseText)
if(returntxt.length>0)
{document.all,ajax.innerHTML="服务器返回结果：<font color='red'>"+returntxt+"</font> [Powered by AJAX]"}
else
{document.all,ajax.innerHTML=""}

//通过XMLHTTP返回数据,开始构建Select.
//BuildSel(returntxt,eval("document.all."+MenuIdArr[classid+1]))
BuildSel(returntxt,document.getElementById(MenuIdArr[classid+1]))

//============更改下下级以下菜单为空==============
var kkk
for(kkk=classid+2;kkk<=MenuClass;kkk++)
{
submenu=document.getElementById(MenuIdArr[kkk])
submenu.length=1
submenu.options[0].selected=true
}
}

function BuildSel(str,sel)
{
/*
*--------------- BuildSel(str,sel) -----------------
* BuildSel(str,sel)
* 功能:通过str构建Select.
* 参数:str,字符串,由服务端返回的.有特定结构"字符串1|,字符串2,字符串3"
* 也可为"字符串1序号|字符串1文本,字符串2序号|字符串2文本,字符串3序号|字符串3文本",如本例
* 参数:sel,要构建的Select
* 实例:BuildSel(unescape(oBao.responseText),document.all.sel2)
*--------------- BuildSel(str,sel) -----------------
*/
//先清空原来的数据.
sel.options.length=0;
var arrstr = new Array();
arrstr = str.split(",");
//开始构建新的Select.
sel.options.add(new Option( "-----请选择-----",""));
if(str.length>0)
{
for(var i=0;i<arrstr.length;i++)
{
//分割字符串
var subarrstr=new Array
subarrstr=arrstr[i].split("|")
//生成下级菜单
sel.options.add(new Option(subarrstr[1],subarrstr[0]));
}
sel.options[0].selected=true
}

}
</script>

<form name="form1" method="post" action="">
<table width="90%" border="0" align="center" cellpadding="2" cellspacing="1" bgcolor="#CCCCCC">
<tr bgcolor="F1F1F1">
<td height="24" colspan="2" align="center">琥珀无限级联动菜单-AJAX版 [HPMenu_AJAX V1.0]</td>
</tr>
<tr bgcolor="#FFFFFF">
<td width="12%" height="24" align="center">所在洲:</td>
<td><select name="sel1" id="sel1" onChange="GetResult(this.value,1)">
<option value="" selected>-----请选择-----</option>
<option value="10">亚洲</option>
<option value="11">欧洲</option>
</select></td>
</tr>
<tr bgcolor="#FFFFFF">
<td height="24" align="center">国　　家:</td>
<td><select name="sel2" id="sel2" onChange="GetResult(this.value,2)">
<option value="" selected>-----请选择-----</option>
</select></td>
</tr>
<tr bgcolor="#FFFFFF">
<td height="24" align="center">城　　市:</td>
<td><select name="sel3" id="sel3" onChange="GetResult(this.value,3)">
<option value="" selected>-----请选择-----</option>
</select></td>
</tr>
<tr bgcolor="#FFFFFF">
<td height="24" align="center">地　　区:</td>
<td><select name="sel4" id="sel4">
<option value="" selected>-----请选择-----</option>
</select></td>
</tr>
<tr bgcolor="F1F1F1">
<td height="24" colspan="2" align="center" id="ajax"> </td>
</tr>
</table>
<br>
<table width="90%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td height="25" align="left"> </td>
</tr>
<tr>
<td height="25" align="left"> </td>
</tr>
<tr>
<td height="25" align="left"> </td>
</tr>
<tr>
<td height="25" align="left"> </td>
</tr>
<tr>
<td height="25" align="left"> </td>
</tr>
<tr>
<td height="50" align="center"> </td>
</tr>
</table>
<script language="javascript">
GetResult(document.getElementById("sel1").value,1)
</script>
</form>
</body>
</html>