Value Not Returned On Second Selection

3 posts, 0 answers
  1. Andrew
    Andrew avatar
    2 posts
    Member since:
    Oct 2012

    Posted 17 May 2011 Link to this post

       We are currently using a RadComboBox with loadOnDemand within our MasterPage.   The SelectedValue of the ComboBox and the SelectedText are properly returned to the SelectedIndexChanged Event when a combobox item is selected from the drop down for the first time but not upon the second selection.  To be more clear.  If you have 3 ComboboxItems (in our case "projects")  : Item 1, Item 2 and Item3.  If Item 1 is selected the SelectedIndexChangedEvent works as expected.  Both the Text and Value of the event are populated in the event handler as expected, If Item 2 is selected the same expected behavior occurs.  If however a user were to RE select Item 1 after previously selecting Item 1 during the same session then ONLY the Text of the event handler is populated in the event value is not populated.  To make matters slightly more confusing the SelectedValue of the combo Box is also returning an empty string only on the reselection but appears to be working properly for the initial selection..  I have no idea why everything seems to be working fine for the first iteration of a selection but not the second.  Any advice would be sincerely appreciated.  Relevant Code Below:


      protected void rcbCurrentProject_ItemsRequested(object sender, Telerik.Web.UI.RadComboBoxItemsRequestedEventArgs e)
                var projects = FluxPermissionManager.GetUserProjectAccess(Page.User.Identity.Name).Select(lkj => new { name =, testProjectID = lkj.testProjectID });
                rcbCurrentProject.DataSource = projects.ToList();

                e.Message = "Displaying All Accessible Projects";            

        protected void rcbCurrentProject_SelectedIndexChanged(object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
            //e.Text Is populated Properly.... no issues
            string projectName = e.Text
            //e.Value returns an empty string following the second time selected.
                    int val = Int32.Parse(e.Value);

            . . . ...



        <telerik:RadComboBox ID="rcbCurrentProject" runat="server" ErrorMessage="None Selected" EnableLoadOnDemand="true"
                                    ShowMoreResultsBox="false" AutoPostBack="true" EnableVirtualScrolling="false" OnPreRender="rcbCurrentProject_PreRender"
                                    DataTextField="name" DataValueField="testProjectID" OnItemsRequested="rcbCurrentProject_ItemsRequested"  
                                    MarkFirstMatch="true" Filter="Contains" AllowCustomText="false" OnSelectedIndexChanged="rcbCurrentProject_SelectedIndexChanged"

          function cleanProjectDefaultSelection(sender, args) {
                if (sender.get_text() != "") {
                    sender._filterText = "";
  2. Kalina
    Kalina avatar
    918 posts

    Posted 20 May 2011 Link to this post

    Hello Andrew,

    I used the code provided to create a sample and to reproduce the issue - but on my side RadComboBox works properly and I am able to get the selected text and value correctly. Please find the sample attached.
    I do not know what the implementation of OnPreRender event handler that you have created is, but on my opinion your code is all right.
    Sometimes a similar issue related to item selection can occur if there are RadComboBox items with same values populated in RadComboBox - you can find more details about this topic here.
    Please check if there are items with same values populated in the RadComboBox.

    Best wishes,
    the Telerik team

    Browse the vast support resources we have to jump start your development with RadControls for ASP.NET AJAX. See how to integrate our AJAX controls seamlessly in SharePoint 2007/2010 visiting our common SharePoint portal.

  3. Andrew
    Andrew avatar
    2 posts
    Member since:
    Oct 2012

    Posted 26 May 2011 Link to this post

    Thanks for your response.  It was an issue in the PreRender Event that was utlimately causing the issue.  In the PreRender Event we were inserting a supposedly temporary combobox Item, so the text of the ComboBox always reflected the currently selected Item.  Because we were under the impression that this item was only temporary and getting trashed on the ItemsRequestedEvent we were inserting a blank value.  Your advice pointed me in the right direction and everything is working properly.  Thanks!
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