Javascript级联操作代码

 js.js
var xmlDoc;
function cleanData(getObj)
{
if(getObj)
{
getObj.options.length = 0;
}
}
function getxmlDoc()
{
xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async=false;
xmlDoc.load("data.xml");
if(xmlDoc.parseError.errorCode!=0)
{
var myErr=xmlDoc.parseError;
alert("出错！"+myErr.reason);
}
}
function InitData()
{
getxmlDoc();
var selectElement1=document.getElementById("Select1");
var selectElement2=document.getElementById("Select2");
cleanData(selectElement1);
cleanData(selectElement2);
var TopNodes = xmlDoc.getElementsByTagName("Root")[0].childNodes;
if(TopNodes.length>0)
{
var College;
var Department;
for(var i=0;i<TopNodes.length;i++)
{
//添加列表项目
College=TopNodes[i];
var createOption=document.createElement("option");
createOption.value=College.getAttribute("id");
createOption.text=College.getAttribute("name");
selectElement1.add(createOption);
}
if(TopNodes[0].childNodes.length>0)
{
for(var j=0 ; j<TopNodes[0].childNodes.length;j++)
{
Department=TopNodes[0];
var createOption=document.createElement("option");
createOption.value=Department.childNodes[j].getAttribute("id");
createOption.text=Department.childNodes[j].getAttribute("name");
selectElement2.add(createOption);
}
}

}
}
function selectColl