The Problem
I have an Ajax Tab Container that contains several tabs. On one of those tabs, I have a control. On the client, how do I find out which tab contains the control?
The Solution
Here is the JavaScript function that I used to solve this problem. In the following code, my tab container is called “Main_TabContainer”.
function getContainingTabIndex(targetControl)
{
// Get a reference to the tabs.
var tabs = $find('<%=Main_TabContainer.ClientID %>').get_tabs();
// Start with the control that we want to find.
var testControl = targetControl;
// While we have not got to the top of the control heirarchy, nor found the control...
while (targetControl!=null)
{
// For each of the tab panels...
var tabIndex;
for (tabIndex = 0; tabIndex < tabs.length; tabIndex++)
{
// If this tab panel contains the target control...
if (tabs[tabIndex].get_element() == testControl)
{
return tabIndex;
break;
}
} // Next index.
// Walk up the DOM to seek out the tab panel that contains the target control.
testControl = testControl.parentNode;
} // Wend.
// The control is not contained in a tab panel.
return -1;
}
All Wrong 
HI;
If you want to find clicked index of a in code behind(C#); I hope this will help You:
————————-Code———————————————
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class TabControl : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
TabContainer1_ActiveTabChanged(TabContainer1, null);
}
}
protected void TabContainer1_ActiveTabChanged(object sender, EventArgs e)
{
DataTable dTable_rgstrtn = null;
DataTable dTable_btch = null;
DataTable dTable_crs = null;
try
{
if (TabContainer1.ActiveTabIndex == 0)
{
dTable_rgstrtn = new DataTable();
dTable_rgstrtn.Columns.Add(“stdnt_cd”);
dTable_rgstrtn.Columns.Add(“rgstrtn_cd”);
dTable_rgstrtn.Columns.Add(“sbjct_chsn”);
dTable_rgstrtn.Columns.Add(“stdnt_stts”);
dTable_rgstrtn.Rows.Add(dTable_rgstrtn.NewRow());
dTable_rgstrtn.Rows[0][“stdnt_cd”] = “S0080032003023”;
dTable_rgstrtn.Rows[0][“rgstrtn_cd”] = “R0080032003023”;
dTable_rgstrtn.Rows[0][“sbjct_chsn”] = “ASP.NET 3.0, SQL 2005, XML”;
dTable_rgstrtn.Rows[0][“stdnt_stts”] = “VALID”;
GridView1.DataSource = dTable_rgstrtn;
GridView1.DataBind();
GridView1.Visible = true;
}
if (TabContainer1.ActiveTabIndex == 1)
{
dTable_btch = new DataTable();
dTable_btch.Columns.Add(“btch_cd”);
dTable_btch.Columns.Add(“smstr_cd”);
dTable_btch.Columns.Add(“smstr_vrsn”);
dTable_btch.Columns.Add(“mx_nmbr_stdnt”);
dTable_btch.Rows.Add(dTable_btch.NewRow());
dTable_btch.Rows[0][“btch_cd”] = “B0001”;
dTable_btch.Rows[0][“smstr_cd”] = “SM100”;
dTable_btch.Rows[0][“smstr_vrsn”] = “1.00”;
dTable_btch.Rows[0][“mx_nmbr_stdnt”] = “20”;
GridView2.DataSource = dTable_btch;
GridView2.DataBind();
GridView2.Visible = true;
}
if (TabContainer1.ActiveTabIndex == 2)
{
dTable_crs = new DataTable();
dTable_crs.Columns.Add(“crs_ttl”);
dTable_crs.Columns.Add(“crs_drtn”);
dTable_crs.Columns.Add(“smrt_crd_rqrd”);
dTable_crs.Rows.Add(dTable_crs.NewRow());
dTable_crs.Rows[0][“crs_ttl”] = “Introducing ASP.NET 3.5”;
dTable_crs.Rows[0][“crs_drtn”] = “48 Hrs”;
dTable_crs.Rows[0][“smrt_crd_rqrd”] = “Yes”;
GridView3.DataSource = dTable_crs;
GridView3.DataBind();
GridView3.Visible = true;
}
}
catch
{
throw;
}
finally
{
}
}
}
Copy&Paste Zindabad????
You can also set the tab index from code behind
like in c#
TabContainer1.ActiveTab = TabPanel1;
its easy and working any doubts mail me.