I hope I have done my homework on this one. I have a fairly large web application and when a button is pressed the webpage jumps to the top of the page on postback. I am aware that the page needs the line MaintainScrollPositionOnPostback="true"
So I went back to first principles and built two web pages. One has an ajax control tookit tabcontainer the second one has not.
On the one with the tabcontainer the maintainposition attribute has no affect and the page jumps back to the tabcontainer. On the one without ajax it works fine. Both pages are below.
Can you please tell me why and how I fix this issue?
Webpage that does maintain position on postback
%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="MaintainMyPosition.WebForm1" MaintainScrollPositionOnPostback="true" %>
<!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 runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
This Web Application will maintain the position on postback</div>
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<asp:Button ID="Button1" runat="server" Text="Press me and position will be maintained" />
</form>
</body>
</html>
Webpage that does NOT maintain position on postback
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="MaintainMyPosition.WebForm2" MaintainScrollPositionOnPostback="true" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<!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 runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" LoadScriptsBeforeUI="True">
</asp:ScriptManager>
<div>
This Web Application will NOT maintain the position on postback
</div>
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<asp:TabContainer ID="TabContainerMain" runat="server" ActiveTabIndex="4" Width="100%"
Height="100%" CssClass="" ViewStateMode="Enabled">
<asp:TabPanel ID="Tab_Errors" runat="server" HeaderText="Tab_Errors">
<ContentTemplate>
<div class="TabControls">
<p>
Hello Im an ajax control tab and I'm going to cause this webpage to not maintain position .</p>
</div>
</ContentTemplate>
</asp:TabPanel>
</asp:TabContainer>
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<asp:Button ID="Button1" runat="server" Text="Press me and position will not be maintained" />
</form>
</body>
</html>
This article should explain it:
http://www.eggheadcafe.com/tutorials/asp-net/7dd57635-0587-42ba-ae73-f52449e653bf/aspnet-ajax-maintain-scroll-position-from-a-partial-page-update.aspx