Question

ITemplate - DataBinding not firing

Asked by: centdevs

I'm implementing ITemplate for a Telerik control and the DataBinding events are not firing.  I've done this in the past with telerik control so I'm familiar with the process.  Can anyone spot an issue? 

<telerik:RadRotator ID="radRotateNews" runat="server" 
Skin="Vista" 
ScrollDuration="3000" FrameDuration="2000" RotatorType="FromCode" 
Width="470px" Height="312px" CssClass="RadRotator_Default" 
AppendDataBoundItems="true" ></telerik:RadRotator> 
 
 
protected void Page_Load(object sender, EventArgs e) 
{
   if (!IsPostBack) 
   {
      DataTable dt = GetScreens(); 
      radRotateNews.DataSource = dt;
      CreateNewsScreens(dt); 
      radRotateNews.DataBind();
   }
}
 
protected void CreateScreens(DataTable dt) 
{ 
   if (dt.Rows.Count > 0) 
   {
      for (int i = 0; i < dt.Rows.Count; i++) 
      {
         string screenType = dt.Rows[i]["ScreenTypeDesc"].ToString();
         RadRotatorItem newsScreen = new RadRotatorItem();  
         newsScreen.ItemTemplate = new NewsRotatorTemplate(screenType, dt.Rows.Count); 
         radRotateNews.Items.Add(newsScreen);
      }
   }
   else 
   {
      //show a default screen/image 
   }
}
 
public class NewsRotatorTemplate : ITemplate 
{
   private string templateType; 
   private int numberScreens; 
 
   public NewsRotatorTemplate(string screenType, int noScreens) 
   {
      this.templateType = screenType; 
      this.numberScreens = noScreens;
   }
 
   public void InstantiateIn(Control container) 
   {
      //...
      Label lblScreenNo = new Label(); 
      lblScreenNo.ID = "lblScreenNo" + screenNo; 
      lblScreenNo.DataBinding += new EventHandler(lblScreenNo_DataBinding); 
      container.Controls.Add(lblScreenNo);
      //...
   }
 
   void lblScreenNo_DataBinding(object sender, EventArgs e) 
   {
      Label lblScreenNo = (Label)sender; 
      RadRotatorItem container = (RadRotatorItem)lblScreenNo.NamingContainer; 
      string fieldValue = DataBinder.Eval(container.DataItem, "ScreenNo").ToString(); 
      lblScreenNo.Text = fieldValue;
   }

                                  
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Asked On
2008-12-24 at 11:11:02ID24008380
Tags

asp.net c#

Topic

C# Programming Language

Participating Experts
1
Points
0
Comments
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Answers

 

by: kaufmedPosted on 2008-12-27 at 23:56:36ID: 23250807

This might be a silly question, but where does "InstantiateIn" get called from?

 

by: centdevsPosted on 2008-12-29 at 07:24:25ID: 23256184

It gets called on line 27, when the template is instantiated.  That part works fine, for instance, I can hard code lblScreenNo.Text = "TEST"; and that will output fine.  It's only the databinding method that is not being called.  One other important distinction, my code is in a user control.

 

by: centdevsPosted on 2008-12-29 at 08:12:34ID: 23256531

I got a response back from the Telerik people, I needed to attach the template to the RadRotator rather than the RadRotatorItem.  

20120131-EE-VQP-002

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