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Combobox not allowing selections after jquery ajax request inside onclientselecteditemchanged event

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ComboBox
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dd
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dd asked on 17 Sep 2013, 04:36 PM
I have a combobox on a page that loads other comboboxes dynamically when the user selects a value.  After this happens once, the user can no longer make a selection in the original combobox.  I made a simple project to reproduce this behavior.  Any ideas as to what I can do to fix this? 

Edit: Telerik version 2009.3.1314.35. Can't upgrade because of project specs.  Thanks.

WebForm1.aspx
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="TestProject1.WebForm1" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
 
<!DOCTYPE html>
 
<head runat="server">
    <title></title>
    <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.js"> </script>
    <script type="text/javascript">
        var currentIndex = -1;
 
        function changeFilter(sender, args) {
            currentIndex++;
             
            $.ajax({
                type: "POST",
                url: "WebForm1.aspx?action=test&row=" + currentIndex,
                success: function (data) {
                    var arr = data.split("|");  //0 is result, 1 is html to add
                    var result = arr[0];
                    if (result == "success") {
                        var html = arr[1];
                        $(html).appendTo($("#container0"));
                    }
 
                }
            });
 
            return false;
        }
 
 
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <telerik:RadScriptManager id="rsm1" runat="server"></telerik:RadScriptManager>
 
        <div>
            <telerik:RadComboBox ID="cmbxExistingFilters" runat="server" ClientIDMode="Static" AutoPostBack="false"
                     EmptyMessage="Saved Filters" RegisterWithScriptManager="false" AllowCustomText="false"
                    AppendDataBoundItems="true" EnableAutomaticLoadOnDemand="false" OnClientSelectedIndexChanged="changeFilter"
                    EnableVirtualScrolling="false" >
 
            </telerik:RadComboBox>
            <div id="hiddenContainer" runat="server" style="display:none;"></div>
            <div id="container0" runat="server"></div>
        </div>
    </form>
</body>
</html>

WebForm1.aspx.vb
Imports Telerik.Web.UI
Imports System.IO
 
Public Class WebForm1
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If HttpContext.Current.Request.Headers("X-Requested-With") = "XMLHttpRequest" Then ' if ajax postback
            Response.Clear()
            Dim row As String = Request.QueryString("row")
            Response.Write("success|" + RenderCustomControl(BuildStatesTextbox(row)) + _
                           RenderCustomControl(BuildSectorCombobox(row)) + "|")
 
        ElseIf IsPostBack Then
 
        Else
            Me.container0.ClientIDMode = UI.ClientIDMode.Static
            BindToCombo(Me.cmbxExistingFilters)
        End If
 
    End Sub
 
    Private Sub BindToCombo(ctrl As RadComboBox)
        ctrl.Items.Clear()
        For i As Integer = 0 To 5
            Dim rci As New RadComboBoxItem
            rci.Text = "hey_" + i.ToString
            rci.Value = "hey_" + i.ToString
            ctrl.Items.Add(rci)
        Next
        ctrl.DataBind()
    End Sub
 
    Private Function RenderCustomControl(ctrl As Control) As String
        Dim sb As New StringBuilder
        Try
            If ctrl IsNot Nothing Then
                Using sw As New StringWriter(sb)
                    Using html As New HtmlTextWriter(sw)
                        ctrl.Page = Me
                        'hiddenContainer.Controls.Add(ctrl)
                        ctrl.RenderControl(html)
                    End Using
                End Using
            End If
        Catch ex As Exception
            Response.Write(ctrl.ID + " Fail<br>")
        End Try
        Return sb.ToString
    End Function
 
 
 
    ''' <summary>
    ''' Create textbox to display states
    ''' </summary>
    ''' <param name="row"></param>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Private Function BuildStatesTextbox(row As String) As RadTextBox
        Dim txtboxStates As New RadTextBox
        txtboxStates.Width = 150
        txtboxStates.ID = "tbxStates_" + row
        txtboxStates.ClientIDMode = UI.ClientIDMode.Static
        txtboxStates.Attributes("onclick") = "alert('" + row + "');"
        txtboxStates.AutoPostBack = False
        'txtboxStates.Style.Add("display", "none")
        txtboxStates.ReadOnly = True
        txtboxStates.RegisterWithScriptManager = False
        Return txtboxStates
    End Function
 
    ''' <summary>
    ''' Create combobox to let the user choose the sector
    ''' </summary>
    ''' <param name="row"></param>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Private Function BuildSectorCombobox(row As String) As RadComboBox
        Dim cmbxSectors As New RadComboBox
        cmbxSectors.Width = 150
        cmbxSectors.ID = "cmbxSectors_" + row
        cmbxSectors.ClientIDMode = UI.ClientIDMode.Static
        For i = 0 To 5
            Dim cmbxItem As New RadComboBoxItem()
            cmbxItem.Text = "bye_" + i.ToString
            cmbxItem.Value = "bye_" + i.ToString
            cmbxSectors.Items.Add(cmbxItem)
        Next
        cmbxSectors.DataBind()
        cmbxSectors.AutoPostBack = False
        ' cmbxSectors.Style.Add("display", "none")
        cmbxSectors.RegisterWithScriptManager = False
        Return cmbxSectors
    End Function
 
End Class

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Nencho
Telerik team
answered on 20 Sep 2013, 02:32 PM
Hello David,

Thank you for contacting Telerik Support.

I was able to replicate the described issue. It seems that the problem is related with the scripts loaded on the page and with the RadScriptManager. Therefore, I would suggest you to currently use the asp:ScriptManager, until we investigate and troubleshoot the problem.

Hope this would help. Please excuse us for any inconveniences caused.

Regards,
Nencho
Telerik
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dd
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Nencho
Telerik team
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