Home / Community & Support / Developer Productivity Tools Forums / ASP.NET AJAX > ListBox > set index from java script

• Dominik

  Posted on Apr 27, 2012 (permalink)

  Hello, I try from client side (java script) set index for RadListBox.
  
  How can I use document.getElementById for finding and set index for RadListBox ?
  
  regards,
  Dominik Kolcio

  Reply

• Shinu MVP

  Posted on Apr 27, 2012 (permalink)

  Hi Dominik,
  
  You can access the RadListBox using $find method and get the index as shown below.
  
  JS:
  

  <script type="text/javascript">

      function pageLoad()

      {

          var list = $find("<%= RadListBox1.ClientID %>");

          var items = list.get_items();

          list.trackChanges();

          var item = new Telerik.Web.UI.RadListBoxItem();

          item.set_text("New");

          item.set_value("Value");

          items.add(item);

          list.commitChanges();

          alert(item.get_index());

      }

  </script>

  
  Thanks,
  Shinu.

  Reply



• Dominik

  Posted on Apr 27, 2012 (permalink)

  Yes, I try this before.
  When try to run app:
  The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).
  
  But this problem I solved with RadScriptBlock.
  
  but I still can't set index in RadListBox from java script :(
  I don't need add any Items, because my RadListtBox is populated with data.
  
  I need select item by index.
  

  Reply

• Dominik

  Posted on Apr 27, 2012 (permalink)

  I solved the problem.
  
  With clearSelection
  getItem and select
  
  thank you Shinu
  
  Dominik

  Reply

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