<TITLE>WebForm2</TITLE>
<SCRIPT language='javascript'>
function load(){
var drp2 = document.getElementById('DropDownList2');
drp2.innerText='';
for(var i = 0;i<=drp2.options.length -1;i++){
drp2.remove(i);
}
var drp3 = document.getElementById('DropDownList3');
for(var i = 0;i<=drp3.options.length -1;i++){
drp3.remove(i);
}
var xmlhttp = new ActiveXObject('MSXML2.XMLHTTP');
var oDoc = new ActiveXObject('MSXML2.DOMDocument');
var state=document.getElementById('DropDownList1').value;
xmlhttp.open('POST', 'webform1.aspx?id='+state,false);
xmlhttp.send('');
var res=oDoc.loadXML(xmlhttp.responseText);
var naItems = oDoc.selectNodes('//Market/Table/maName');
var idItems = oDoc.selectNodes('//Market/Table/maId');
var item;
var id;
for (item = naItems.nextNode(),id=idItems.nextNode(); item&&id; item = naItems.nextNode(),id=idItems.nextNode()){
var nastr = item.nodeTypedValue;
var idstr = id.nodeTypedValue;
var newOption = document.createElement('OPTION');
newOption.text =nastr;
newOption.value = idstr;
drp2.options.add(newOption);
}
load2();
}
function load2(){
var drp2 = document.getElementById('DropDownList3');
drp2.innerText='';
for(var i = 0;i<=drp2.options.length -1;i++){
drp2.remove(i);
}
var xmlhttp = new ActiveXObject('MSXML2.XMLHTTP');
var oDoc = new ActiveXObject('MSXML2.DOMDocument');
var state=document.getElementById('DropDownList2').value;
xmlhttp.open('POST', 'webform3.aspx?id='+state,false);
xmlhttp.send('');
var res=oDoc.loadXML(xmlhttp.responseText);
var naItems = oDoc.selectNodes('//Market/Table/maName');
var idItems = oDoc.selectNodes('//Market/Table/maId');
var item;
var id;
for (item = naItems.nextNode(),id=idItems.nextNode(); item&&id; item = naItems.nextNode(),id=idItems.nextNode()){
var nastr = item.nodeTypedValue;
var idstr = id.nodeTypedValue;
var newOption = document.createElement('OPTION');
newOption.text =nastr;
newOption.value = idstr;
drp2.options.add(newOption);
}
}
</SCRIPT>
</HEAD>
<BODY ms_positioning='GridLayout' onload='load()'>
<FORM id='Form1' method='post' runat='server'>
<ASP:DROPDOWNLIST id='DropDownList1' runat='server'></ASP:DROPDOWNLIST>
<ASP:DROPDOWNLIST id='DropDownList2' runat='server'></ASP:DROPDOWNLIST>
<ASP:DROPDOWNLIST id='Dropdownlist3' runat='server'></ASP:DROPDOWNLIST>
</FORM>
</BODY>
</HTML>
-----------------------
namespace dropDown
{
/// <summary>
/// WebForm2 的摘要说明。
/// </summary>
public class WebForm2 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DropDownList DropDownList1;
protected System.Web.UI.WebControls.DropDownList Dropdownlist3;
protected System.Web.UI.WebControls.DropDownList DropDownList2;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!this.IsPostBack)
{
SqlConnection con = new SqlConnection('server=localhost;database=star;uid=sa;pwd=');
SqlDataAdapter da = new SqlDataAdapter('select maId,maName from tabMarket where maCls=0',con);
DataSet ds = new DataSet();
da.Fill(ds,'op');
this.DropDownList1.DataSource=ds.Tables[0];
this.DropDownList1.DataTextField = 'maName';
this.DropDownList1.DataValueField = 'maId';
this.DropDownList1.DataBind();
this.DropDownList1.Attributes.Add('onchange','load()');
this.DropDownList2.Attributes.Add('onchange','load2()');
}
}
}
}
-----------------------
public class WebForm1 : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
// Put user code to initialize the page here
//if(this.Request['state']!=null)
//{
string id =this.Request['id'];
SqlConnection con = new SqlConnection('server=localhost;database=star;uid=sa;pwd=;');
SqlDataAdapter da = new SqlDataAdapter('select maName,maId from tabMarket where maParent=@id and maSt=1 ',con);
da.SelectCommand.Parameters.Add('@id',id);
DataSet ds = new DataSet('Market');
da.Fill(ds);
ds.WriteXml(Response.OutputStream);
Response.Flush ();
Response.End ();
//}
}
}
-----------------------------
public class WebForm3 : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
string id =Request['id'];
SqlConnection con = new SqlConnection('server=localhost;database=star;uid=sa;pwd=;');
SqlDataAdapter da = new SqlDataAdapter('select maName,maId from tabMarket where maParent=@id and maSt=1',con);
da.SelectCommand.Parameters.Add('@id',id);
DataSet ds = new DataSet('Market');
da.Fill(ds);
ds.WriteXml(Response.OutputStream);
Response.Flush ();
Response.End ();
}
}
------------------
