// Select Changed
var cmb_CourseClass;
var cmb_Course;
var cmb_Classroom;
var cmb_Month;
var txtKey;
var imgSearch;
var hdCourseId;

function cmb_IndexChanged()
{
	if (cmb_CourseClass.selectedIndex==0)
	{
		cmb_Course.options.length=0;
		var op=new Option("--请先选择课程大类--","0");
		cmb_Course.options[0]=op;
		cmb_Course.disabled=true;
		hdCourseId.value="0";
		return;
	}
	else
	{
		cmb_Course.disabled=false;

	}
	
	var http_Request=AjaxInit();
	http_Request.open("GET","http://www.trycn.com/BackCall/DataAction.aspx?CourseClassId="+cmb_CourseClass.options[cmb_CourseClass.selectedIndex].value,true);
	
	http_Request.onreadystatechange=function()
	{
		if(http_Request.readyState==4)
		{
			if(http_Request.status==200)
			{
				//alert(http_Request.responseText);
				cmb_Course.options.length=0;
				var op;
				var doc=new ActiveXObject("MSXML.DOMDocument");
				doc.loadXML(http_Request.responseText);
				var nodText=doc.selectNodes("//CourseName");
				var nodValue=doc.selectNodes("//CourseId");
				
				op=new Option("--不限--",-1);
				cmb_Course.options.add(op);
				for(var i=0;i<nodText.length;i++)
				{
					op=new Option(nodText[i].text,nodValue[i].text);
					cmb_Course.options.add(op);
				}
				cmb_Course.options[0].selected=true;
				hdCourseId.value=cmb_Course.options[0].value;
			}
			else
				alert('Error');
		}
	}
	http_Request.send(null);
}

function cmb_CourseIndexChanged()
{
    hdCourseId.value=cmb_Course.options[cmb_Course.selectedIndex].value
}

function Validate()
{
    if(txtKey.value=="" && (hdCourseId.value =="0" && cmb_Classroom.options[cmb_Classroom.selectedIndex].value =="0") && cmb_Month.value=="0")
    {
        alertWin('提示','您的选择条件不全，请重新选择！',300,200);
        return false;
    }
    else
        return true;
}

window.onload=function()
{
	cmb_CourseClass=document.getElementById("Header1_ddlCourseClass");
	cmb_Course=document.getElementById("Header1_ddlCourse");
	cmb_Classroom=document.getElementById("Header1_ddlAddress");
	cmb_Month=document.getElementById("Header1_ddlMonth")
    txtKey=document.getElementById("txtKey");
    imgSearch=document.getElementById("Header1_imgSearch");
    hdCourseId=document.getElementById("hdCourseId");
    
	cmb_Course.disabled=true;
	cmb_CourseClass.attachEvent("onchange",cmb_IndexChanged);
	cmb_Course.attachEvent("onchange",cmb_CourseIndexChanged);
	imgSearch.attachEvent("onclick",Validate);
	//var Li=document.getElementById("myTab1_Content0");
    //InitClassList(Li,39);
}