Combobox Dropdown doesn't show after item is clicked

2 posts, 0 answers
  1. Web Services
    Web Services avatar
    243 posts
    Member since:
    Apr 2008

    Posted 20 Nov 2013 Link to this post

    I have a combo box inside an ajax panel like so
    <telerik:RadScriptManager ID="manager" runat="server"></telerik:RadScriptManager>
                <telerik:RadAjaxPanel ID="RadAjaxPanel3" runat="server" LoadingPanelID="RadAjaxLoadingPanel1">
                <telerik:RadComboBox ID="userInput" runat="server" AllowCustomText="True" CausesValidation="false" ShowToggleImage="False"
                    ShowMoreResultsBox="true" EnableLoadOnDemand="True" MarkFirstMatch="True"
                    ErrorMessage="Value not Found" AutoPostBack="True" Width="300">
                    <CollapseAnimation Duration="1000" Type="InBack" />
            <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" SkinID="Hay"
            Height="25px" Transparency="1" BackgroundPosition="Center" >
            <img alt="Loading..." src="../images/loading.gif" style="border: 0px;" />

    When I click in it, it loads items and if I start typing, it also searches correctly. However, once I select an item, no more items will load. Even if I delete text, nothing comes up. Here's my code behind

    protected void Page_Load(object sender, EventArgs e)
        if (!Page.IsPostBack)
            userInput.DataSource = GetCustomers();
            userInput.DataValueField = "Key";
            userInput.DataTextField = "Value";
        }//if !page.ispost
    protected void LoadSearch(object sender, RadComboBoxItemsRequestedEventArgs e)
        //get the list based on the search
        IEnumerable<Vw_CustomersSearchView> customers = DbRepository.GetCustomersSearchView().Where(c => c.Customer.Contains(e.Text));
        //how many items we'll show
        int itemsPerReq = 10;
        //keep count of the items
        int count = 0;
        RadComboBox box = (RadComboBox)sender;
        //make sure we have at least one record
        if (customers.Count() > 0)
            //now add any customer items
            foreach (var i in customers)
                //if we're above 10, exit the loop
                if (count >= itemsPerReq)
                }//if count > itemsper
                //if we're here, add the items
                box.Items.Add(new RadComboBoxItem(i.Customer, i.UserName));
        }//if customers.count
            e.Message = "No matches";
    /// <summary>
    /// this returns a dictionary of the customers for the customer dropdown
    /// </summary>
    /// <returns></returns>
    protected Dictionary<string, string> GetCustomers()
        Dictionary<string, string> customersList = new Dictionary<string, string>();
        //now add the items
        var cTable = DbRepository.GetActiveCustomers().Where(a => a.LoyaltyCardNumber != null).Select(a => new {a.UserName, a.FirstName, a.LoyaltyCardNumber, a.LastName});
        foreach (var i in cTable)
            string name = String.Format("{0}{1}{2}{3}{4}", i.FirstName, " ", i.LastName, " - ", i.LoyaltyCardNumber);
            customersList.Add(i.UserName, name);
        return customersList;
    /// <summary>
    /// if they picked an item in the combox box, repopulate it
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void userInput_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
        userInput.DataSource = GetCustomers();
        userInput.DataValueField = "Key";
        userInput.DataTextField = "Value";

    Here's a video of what's happening. How do I make it pull the dropdown again, even after you select an item.

  2. Nencho
    Nencho avatar
    1881 posts

    Posted 26 Nov 2013 Link to this post


    I am afraid that after several tests, base on the provided code snippet, I was unable to replicate the demonstrated issue locally. However, I noticed that you are populating the RadComboBox at the PageLoad event, while a LoadOnDemand functionality is enabled. The purpose of the LoadOnDemand functionality is to push the RadComboBox to request its underlying datasource, once the user types in the input of the control or expands the dropdown. Therefore, my suggestion would be to choose one approach for populating the control with data.

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