How to get the changed order after using JavaScript to change the values and order of items such as the ListBox control

Control methods:
Each time you change the order or change the value, all the item in the current listbox is saved in the Hidden tab through a for () loop, and this hidden label can only be an HTML control (remember: You cannot use the server control textbox.


Because the visible is set to false, it will not have this element on the page, and JavaScript will also because there is no corresponding element and error, and finally loopback to the server through a decomposition function to decompose the correct order and value

。
Specific:
Script
<script language= "JavaScript" >
<!--
function Remembernow ()
{
Record the current selection and save the values and order in the current list in hidden
Lstresult is the server control listbox
Txtselecteditems is <input type=hidden>.
var count;
var str= "";
Count=form1.lstresult.options.length;
for (Var i=0;i<count;i++)
{
Str+=form1.lstresult.options[i].value + "," + Form1.lstresult.options[i].text + ";";
}
form1.txtselecteditems.value=str;//For example: 1, Leng 2, gently flying;
}
-->
</script>
Server-side code:
private void Page_Load (object sender, System.EventArgs e)
{
Try
{
Fills the modified order and values into the target listbox
The Parseit function is used to decompose the correct values and order
Lstresult.datasource=parseit (Txtselecteditems.value);
Lstresult.datavaluefield= "ID";
Lstresult.datatextfield= "Name";
Lstresult.databind ();
}
catch (Exception ex)
{
Response.Write (ex. message);
}
}
Private ICollection Parseit (String str)
{
DataTable dtl=new DataTable ();
Dtl. Columns.Add (New DataColumn ("ID"));
Dtl. Columns.Add (New DataColumn ("Name"));
int i=0;
Int J;
while (J=str. IndexOf (";", I)) >=0)
{
string tmp;
Tmp=str. Substring (i,j-i);
String Parsenumber,parsename= "";
Parsenumber=tmp. Substring (0,tmp. IndexOf (","));
Parsename=tmp. Substring (TMP. IndexOf (",") +1,tmp. Length-tmp.indexof (",")-1);
Try
{
DataRow Dr=dtl. NewRow ();
dr["ID"]=convert.toint32 (Parsenumber);
dr["Name"]=parsename;
Dtl. Rows.Add (DR);
}
Catch
{}
i=j+1;
}
Dtl. AcceptChanges ();
Return DTL. DefaultView;
}