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Missing Data when using with Master Page

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ComboBox

This is a migrated thread and some comments may be shown as answers.

Jason Gajewski asked on 30 Jun 2010, 09:49 PM

When binding data to the RadComboBox utilizing an Ajax panel, the RadComboBox loses its datasource when used within a master page. The RadComboBox is populated on initial load, but after making a selection, it loses the datasource.

My master page markup:

    
            <%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site1.master.cs" Inherits="Management.Web.Site1" %> 
        
            <!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>  
        
                <asp:ContentPlaceHolder ID="head" runat="server">  
        
                </asp:ContentPlaceHolder> 
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server">  
        
                <div> 
        
                    <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">  
        
                    </asp:ContentPlaceHolder> 
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

My content page markup (WebForm1):

    
            <%@ Page Title="" Language="C#" MasterPageFile="~/Site1.Master" AutoEventWireup="true" 
        
                CodeBehind="WebForm1.aspx.cs" Inherits="Management.Web.WebForm1" %> 
        
            <asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">  
        
            </asp:Content> 
        
            <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server" 
        
                ViewStateMode="Enabled">  
        
                <telerik:RadScriptManager ID="RadScriptManager1" runat="server">  
        
                </telerik:RadScriptManager> 
        
                <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server">  
        
                    <telerik:RadComboBox ID="RadComboBox1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="RadComboBox1_SelectedIndexChanged">  
        
                    </telerik:RadComboBox> 
        
                </telerik:RadAjaxPanel> 
        
            </asp:Content>

My non-master page markup (WebForm2):

    
            <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="Management.Web.WebForm2" %> 
        
            <!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> 
        
                    <telerik:RadScriptManager ID="RadScriptManager1" runat="server">  
        
                    </telerik:RadScriptManager> 
        
                    <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server">  
        
                        <telerik:RadComboBox ID="RadComboBox1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="RadComboBox1_SelectedIndexChanged">  
        
                        </telerik:RadComboBox> 
        
                    </telerik:RadAjaxPanel> 
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

My code behind (of both the content and non-master pages):

    
            using System;  
        
            using System.Web.UI;  
        
            namespace Management.Web  
        
            {  
        
                public partial class WebForm1 : System.Web.UI.Page  
        
                {  
        
                    protected void Page_Load(object sender, EventArgs e)  
        
                    {  
        
                        if (!Page.IsPostBack)  
        
                            this.LoadTags();  
        
                    }  
        
                    private void LoadTags()  
        
                    {  
        
                        TagManager mgr = new TagManager();  
        
                        RadComboBox1.DataSource = mgr.GetAllByModuleId(5);  
        
                        RadComboBox1.DataValueField = "Id";  
        
                        RadComboBox1.DataTextField = "Name";  
        
                        RadComboBox1.DataBind();  
        
                    }  
        
                    protected void RadComboBox1_SelectedIndexChanged(object o, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)  
        
                    {  
        
                    }  
        
                }  
        
            }

As you can see, the code is VERY basic. The TagManager is a class that returns the data.

When using the Master Page (WebForm1), you lose the datasource after you make your first selection. If you attempt to click on the drop down arrow, after making your initial selection, the RadComboBox is empty (doesn't even respond to the click).

When using the non Master Page (WebForm2), the datasource is persisted no matter how many times you make a selection in the RadComboBox.

Any thoughts why there is a difference when using a master page?

12 Answers, 1 is accepted

answered on 02 Jul 2010, 01:43 PM

combopostback.zip

Hi Jason,

We tried to reproduce the problem, but without much success. Please find attached a project as part of our local tests.

What might be the difference in your case? Are we missing something?

Kind regards,
Helen
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items

answered on 02 Jul 2010, 04:23 PM

combonet40.zip

Hi Jason,

I'm still unable to reproduce the problem. Please find attached a movie as part of our local tests.

What are we missing?

Greetings,
Helen
the Telerik team

answered on 06 Jul 2010, 11:56 AM

combopostback.zip

Hello Jason,

Please find attached our test project. It works locally.

Greetings,
Helen
the Telerik team

answered on 07 Jul 2010, 04:59 PM

7-7-2010-10-57-23-am.png

The difference is that I am using a web APPLICATION. I have successfully been able to get it to work within a web SITE... now I will try a web APPLICATION utilizing the same code.

answered on 08 Jul 2010, 07:51 PM

Hi, I think I've come across a similar problem. This is the basic example..
master page

<%@ Master Language="VB" CodeFile="MasterPage.master.vb" Inherits="home_MasterPage" %>

<!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>

<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">

</asp:ContentPlaceHolder>

</div>

</form>

</body>

</html>

aspx page

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="home_Default"

MasterPageFile="~/home/MasterPage.master" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">

<telerik:RadScriptManager ID="RadScriptManager1" runat="server">

</telerik:RadScriptManager>

<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" Height="200px" Width="300px">

<telerik:RadComboBox ID="RadComboBox1" runat="server" AutoPostBack="true">

<Items>

<telerik:RadComboBoxItem Text="a" />

<telerik:RadComboBoxItem Text="b" />

<telerik:RadComboBoxItem Text="c" />

</Items>

</telerik:RadComboBox>

</telerik:RadAjaxPanel>

</asp:Content>

running IIS7.5 under the Configuration>System.Web>Pages> section of web.config first set ClientModeID=AutoID
control should respond as expected, now remove the ClinetModeID tag in web.config so the conrolID's are generated in the new Pedictable method and the contol will not respond after the first postback due to a dropped autocomplete="off" element in the rendering...

Are there any plans to incorperate the new default ClientModeID method into the controls?

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Missing Data when using with Master Page

12 Answers, 1 is accepted