ListBox.get_checkedItems() is stale

[Jeff]

So, I have scoured the NET and the ListBox release notes and cannot find anyone else having this problem so I am hoping this will be an easy fix by a Telerik Guru. I am using,

• Telerik UI for ASP.NET AJAX ver. 2014.3.1209.45
• browser: Chrome

Behavior: Upon initial load, I write values from the server side to the new control. Upon checking or unchecking, my JavaScript function fires, but the ListBox's get_checkedItems() method returns the items that are checked "before" the "OnClientItemChecking" event fires. I would expect to get the items of the ListBox after I check or uncheck items, in other words, the current state of the ListBox. Anyone have any ideas?

<telerik:RadListBox ID="CMListBox" runat="server" RenderMode="Lightweight" SelectionMode="Multiple"CheckBoxes="true" Width="300px" OnClientItemChecking="CMListBox_ItemChecking" Height="100px">                                <Items></Items></telerik:RadListBox>

function CMListBox_ItemChecking(sender,args)
{
  var Radlb = $find("<%= CMListBox.ClientID %>");
  var txt = "";
  var labelStr = "";
  var iter = Radlb.get_checkedItems().length;
  for (var i = 0; i < iter ; i++)
 {
    txt = Radlb.get_checkedItems()[i].get_text();
    labelStr += txt + "<br>";
 }
  if (labelStr != ""){
    labelStr = labelStr.substring(0, labelStr.length - 4);
 }
  else {
    labelStr = "None";
 }
  var s = document.getElementById("CommManagerID");
 s.innerHTML = labelStr;
}

[Ivan Danchev]

Hello Jeff,

As explained in the documentation the newly checked/unchecked items are not available in the checked items collection in the OnClientItemChecking event handler, because this event fires prior to the items being actually checked/unchecked. One of the purposes of this event is that it can be cancelled and thus prevent the action, so if you want to get the current state after the items are checked/unchecked you can use a different event: OnClientItemChecked.

Regards,
Ivan Danchev
Telerik by Progress

[Jeff]

Thank you!