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OnclientClosing does not fire in Radcombobox control

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Prathap asked on 08 May 2012, 06:50 PM
I am using radcombobox with checkbox options.
I need onclientclosing event to be fired for a web part.
I was able to achieve this using aspx page as shown below

<telerik:RadComboBox ID="cmbSites" CheckBoxes="true" EnableCheckAllItemsCheckBox="true"  runat="server" HighlightTemplatedItems="true" MaxHeight="200" EmptyMessage="+ Select Site +"
                        width="300px" Skin="MySkin_Default" EnableEmbeddedSkins="false" OnClientDropDownClosing="HandleCloseSite" />
java script
function HandleClose(combo) {
          var items = combo.get_items();
          var csv = "";
          for (i = 0; i < items.get_count(); i++) {
              var chk = getItemCheckBox(items.getItem(i));
              if (chk != null && chk.checked) csv += "," + items.getItem(i).get_value();
          if (csv.length > 2) {
              return csv.substring(1);
              return combo.get_value();
Now I need write the same code in code behind for a web part.
in createchildcontrols I am declaring the radcombobox
            cmbChildEntities = new RadComboBox();
            cmbChildEntities.Visible = true;
            cmbChildEntities.AutoPostBack = true;
            cmbChildEntities.EnableCheckAllItemsCheckBox = true;
            cmbChildEntities.HighlightTemplatedItems = true;
            cmbChildEntities.CheckBoxes = true;
            cmbChildEntities.Width = 275;
            cmbChildEntities.EnableEmbeddedSkins = false;
            cmbChildEntities.Skin = "MySkin_Default";
In render I have a javascript call
 string js;
                js = "function HandleCloseRegion(){\n";
                js += "alert('test.');\n";
                js += "}\n";

                Page.ClientScript.RegisterStartupScript(this.GetType(), "PIROptions", js, true);

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Telerik team
answered on 11 May 2012, 11:39 AM
Hi Prathap,

Here is how you could create RadComboBox dynamically and register its client event handlers on the page as well:
protected void Page_PreInit(object sender, EventArgs e)
    RadComboBox combo = new RadComboBox();
    combo.ID = "RadComboBox1";
    combo.CheckBoxes = true;
    combo.EnableCheckAllItemsCheckBox = true;
    combo.AutoPostBack = false;
    combo.HighlightTemplatedItems = true;
    combo.Items.Add(new RadComboBoxItem("111", "111"));
    combo.Items.Add(new RadComboBoxItem("222", "222"));
    combo.Items.Add(new RadComboBoxItem("333", "333"));
    combo.Items.Add(new RadComboBoxItem("444", "444"));
    combo.Items.Add(new RadComboBoxItem("555", "555"));
    combo.OnClientDropDownClosing = "HandleCloseRegion";
    string hanldeCloseRegion = @"function HandleCloseRegion(sender, args){
          var csv = '';
          sender.get_checkedItems().forEach(function(item, index){
            csv += ',' + item.get_value()
          if (csv.length > 2) {
    ScriptManager.RegisterClientScriptBlock(this, GetType(), "handler", hanldeCloseRegion, true);

I hope this will help.

Kind regards,
the Telerik team
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