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PanelBar DataBinding Subcontrols

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PanelBar

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

itmanager@malibuboats.com asked on 23 Mar 2009, 09:39 PM

I have a PanelBar that is databounded to a list via the code behind. Inside the PanelBar I want a template that has a control inside it and the control is databounded OnItemDataBound of the PanelBar by getting a value from the PanelBarItem. The issue I'm having is that I can't find the control to bind to it. The code throws a null reference exception on line 27 of the code behind below.

Here is the html markup

    
            <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TelerikTest._Default" %> 
        
            <%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %> 
        
            <!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:RadFormDecorator ID="RadFormDecorator1" Runat="server" /> 
        
                        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">  
        
                            <AjaxSettings> 
        
                                <telerik:AjaxSetting AjaxControlID="RadAjaxManager1">  
        
                                    <UpdatedControls> 
        
                                        <telerik:AjaxUpdatedControl ControlID="PanelBar1" /> 
        
                                    </UpdatedControls> 
        
                                </telerik:AjaxSetting> 
        
                            </AjaxSettings> 
        
                        </telerik:RadAjaxManager> 
        
                        <telerik:RadPanelBar      
        
                                ID="PanelBar1"      
        
                                runat="server"      
        
                                OnItemDataBound="PanelBar1_OnItemDataBound"    
        
                                Skin="Vista"    
        
                                DataTextField="Name"    
        
                                DataValueField="ID"    
        
                                ExpandMode="SingleExpandedItem"    
        
                                >    
        
                                <Items>    
        
                                        <telerik:RadPanelItem Value="SubItem" runat="server">     
        
                                                <ItemTemplate>    
        
                                                        <asp:Repeater     
        
                                                                ID="SubItemList"      
        
                                                                runat="server">     
        
                                                                <ItemTemplate>    
        
                                                                        <asp:CheckBox      
        
                                                                                id="uiItem"      
        
                                                                                runat="server"      
        
                                                                                Text='<%# DataBinder.Eval(Container.DataItem, "Name").ToString() %>'      
        
                                                                                />    
        
                                                                        <br />    
        
                                                                </ItemTemplate>    
        
                                                        </asp:Repeater>    
        
                                                </ItemTemplate>    
        
                                        </telerik:RadPanelItem>    
        
                                </Items>    
        
                        </telerik:RadPanelBar>    
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

Code Behind

    
            using System;  
        
            using System.Collections.Generic;  
        
            using System.Linq;  
        
            using System.Web;  
        
            using System.Web.UI;  
        
            using System.Web.UI.WebControls;  
        
            namespace TelerikTest  
        
            {  
        
                public partial class _Default : System.Web.UI.Page  
        
                {  
        
                    protected void Page_Load(object sender, EventArgs e)  
        
                    {  
        
                        List<ParentItem> pLst = new List<ParentItem>();  
        
                        for (int i = 0; i < 10; i++)  
        
                        {  
        
                            pLst.Add(new ParentItem(i, string.Format("Parent {0}", i.ToString())));  
        
                        }  
        
                        PanelBar1.DataSource = pLst;  
        
                        PanelBar1.DataBind();  
        
                    }  
        
                    protected void PanelBar1_OnItemDataBound(object sender, Telerik.Web.UI.RadPanelBarEventArgs e)  
        
                    {  
        
                        Repeater subItem = (Repeater)e.Item.Items.FindItemByValue("SubItem").FindControl("SubItemList");  
        
                        int ID = int.Parse(e.Item.Value);  
        
                        subItem.DataSource = GetItems(ID).Values;  
        
                        subItem.DataBind();  
        
                    }  
        
                    private SortedList<int, CustomItem> GetItems(int ID)  
        
                    {  
        
                        SortedList<int, CustomItem> lst = new SortedList<int, CustomItem>();  
        
                        for (int i = 0; i < 10; i++)  
        
                        {  
        
                            CustomItem item = new CustomItem(i, string.Format("Item {0}", i), ID);  
        
                            lst.Add(i, item);  
        
                        }  
        
                        return lst;  
        
                    }  
        
                }  
        
                public class CustomItem  
        
                {  
        
                    public int ID { get; set; }  
        
                    public string Name { get; set; }  
        
                    public int ParentID { get; set; }  
        
                    public CustomItem(int id, string name, int parentID)  
        
                    {  
        
                        ID = id;  
        
                        Name = name;  
        
                        ParentID = parentID;  
        
                    }  
        
                }  
        
                public class ParentItem  
        
                {  
        
                    public int ID { get; set; }  
        
                    public string Name { get; set; }  
        
                    public ParentItem(int id, string name)  
        
                    {  
        
                        ID = id;  
        
                        Name = name;  
        
                    }  
        
                }  
        
            }

PanelBar DataBinding Subcontrols

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