AJAX: TabContainer not maintaining ActiveTabIndex between postbacks
Problems
When I select a row from the GridView on "TabPanel2", the ActiveTabIndex is not maintained and appears to be reset.
ASPX
<%@ page autoeventwireup="true" codefile="Tabs.aspx.cs" inherits="Tabs" language="C#" title="Untitled Page" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <aspx:scriptmanager id="ScriptManager1" runat="server"> </aspx:scriptmanager> <ajax:tabcontainer id="TabContainer1" runat="server"> <ajax:tabpanel id="TabPanel1" runat="server" headertext="TabPanel1"> <contenttemplate> TabPanel1 </contenttemplate> </ajax:tabpanel> <ajax:tabpanel id="TabPanel2" runat="server" headertext="TabPanel2"> <contenttemplate> TabPanel2 <asp:gridview id="GridView1" runat="server" autogenerateselectbutton="true"> </asp:gridview> </contenttemplate> </ajax:tabpanel> </ajax:tabcontainer> </form> </body> </html>
CODE-BEHIND
using System;
using System.Collections.Generic;
public partial class Tabs : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
List<int> numbers = new List<int>();
for (int i = 1; i < 11; i++)
{
numbers.Add(i);
}
GridView1.DataSource = numbers;
GridView1.DataBind();
}
}
}
Solutions
I looked into it. It seems it's caused by not saving client state correctly when the postback is triggered by GridView. My solution is saving it manually.
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
System.Collections.Generic.List<int> numbers = new System.Collections.Generic.List<int>();
for (int i = 1; i < 11; i++)
{
numbers.Add(i);
}
GridView1.DataSource = numbers;
GridView1.DataBind();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>
<script type="text/javascript">
function OnChanged(sender, args)
{
sender.get_clientStateField().value = sender.saveClientState();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:scriptmanager id="ScriptManager1" runat="server">
</asp:scriptmanager>
<ajaxtoolkit:tabcontainer OnClientActiveTabChanged="OnChanged" id="TabContainer1" runat="server" ActiveTabIndex="0">
<ajaxtoolkit:tabpanel id="TabPanel1" runat="server" headertext="TabPanel1">
<contenttemplate>
TabPanel1
</contenttemplate>
</ajaxtoolkit:tabpanel>
<ajaxtoolkit:tabpanel id="TabPanel2" runat="server" headertext="TabPanel2">
<contenttemplate>
TabPanel2<asp:Button ID="Button1" runat="server" Text="Button" />
<asp:gridview id="GridView1" runat="server" autogenerateselectbutton="True">
</asp:gridview>
</contenttemplate>
</ajaxtoolkit:tabpanel>
</ajaxtoolkit:tabcontainer>
</form>
</body>
</html>
