Home / Community & Support / Developer Productivity Tools Forums / ASP.NET AJAX > ListBox > ItemCreated getting called continuously..?

• Andrew Galea

  Posted on Jan 12, 2012 (permalink)

  I am using the ItemCreated event to retrieve a logo from the database for any items that are added to it.  The code also updates a "Point Total" for the items in the ListBox once the new item has been created.  This all is working fine.
  
  However when I step through the code I find that the ItemCreated method is getting called for all existing items in the ListBox as well as the newly added one.  To make it worse it seems the ItemCreated method is called for every existing item in the ListBox whenever the SelectedIndexChanged event is raised as well.  Is this normal behaviour?
  
  Here is my ItemCreated code snippet:
  
  

  protected void listEntity_ItemCreated(object sender, RadListBoxItemEventArgs e)

          {

              RadListBox listBox = (RadListBox)sender;

   

              RadListBoxItem item = e.Item;

   

              LMEntityEntity entity = new LMEntityEntity(int.Parse(item.Value));

   

              RadBinaryImage entityLogo = (RadBinaryImage)item.FindControl("entityLogo");

              if (entity.Logo.Length > 0)

                  entityLogo.DataValue = entity.Logo;

              else

                  entityLogo.ImageUrl = "~/images/faction-icons/" + _factionName.ToLower() + ".jpg";

              item.DataBind();

   

              UpdatePointTotal(listBox);

          }

  
  And here is my ListBox declaration in the HTML:
  
  

  <telerik:RadListBox ID="upgradesListBox" runat="server" width="400px" DataKeyField="LMEntityIdChild"

                                  Height="170px" CssClass="list-box" Skin="Black" AllowDelete="False" DataValueField="LMEntityIdChild"

                                  AllowTransfer="True" TransferToID="listEntityListBox"

                                  AutoPostBack="false" AllowReorder="False"

                                  onitemdatabound="upgrades_ItemDataBound" AllowTransferDuplicates="True"

                                  AllowTransferOnDoubleClick="True" AutoPostBackOnTransfer="True"

                                  ontransferring="upgrades_Transferring" TransferMode="Copy">

                                  <ItemTemplate>

                                      <telerik:RadBinaryImage id="logoImage" runat="server" CssClass="list-box-icon"

                                          DataValue='<%# (int)(Eval("LMEntity.Logo.Length"))>0?Eval("LMEntity.Logo"):null %>' height="20px" ResizeMode="Fit" width="20px" />

                                      <span class="list-box-text"><asp:Label ID="itemLabel" runat="server"></asp:Label></span>

                                  </ItemTemplate>               

                                  <ButtonSettings ShowTransferAll="False" TransferButtons="TransferFrom" />

                              </telerik:RadListBox>

  
  Regards,
  Andrew

  Reply

• Princy MVP

  Posted on Jan 12, 2012 (permalink)

  Hello Andrew,
  
  The ItemCreated event occurs for each new item that is added to the Items collection of the RadListBox.
  
  The following help document explains more on this.
  ItemCreated.
  
  Thanks,
  Princy.

  Reply


• Chris

  Posted on Feb 11, 2012 (permalink)

  I'm also noticing this issue. The support page mentioned above does not address the issue. I think OnItemCreated should only be fired when a new item is added to the ListBox, not for every item already in the ListBox on every postback. Is another event I should be using?
  
  Thanks,
  Chris
  

  Reply

• Peter Filipov Peter Filipov

  Posted on Feb 16, 2012 (permalink)

  Hi Chris,
  
  RadListBox supports only ItemCreated event which is fire for each item. There is no event that is fired only for the newly created items.
  
  All the best,
  Peter Filipov
  the Telerik team

  Sharpen your .NET Ninja skills! Attend Q1 webinar week and get a chance to win a license! Book your seat now >>

  Reply

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