RadDropDownList OnSelectedIndexChanged doesn't hit event method

[Jeremy]

I added a RadDropDownList to my user control and added a OnSelectedIndexChanged but when I run the project and change the dropdown index, it doesn't hit the OnSelectedIndexChanged method.

<telerik:RadDropDownList ID="RadDropDownList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="RadDropDownList1_SelectedIndexChanged">
    <Items>
        <telerik:DropDownListItem Text="-- ALL --" Value="0" />
        <telerik:DropDownListItem Text="Test 1" Value="1"  />
        <telerik:DropDownListItem Text="Test 2" Value="2" />
    </Items>
</telerik:RadDropDownList>

protected void RadDropDownList1_SelectedIndexChanged(object sender, Telerik.Web.UI.DropDownListEventArgs e)
{
    int x = -1;
    x = e.Index;
}

I put a breakpoint on the first line of the SelectedIndexChanged method and it never gets in there.

[Jeremy]

Clarification:  I realized the event isn't firing because the user control this DropDownList is in is dynamically created in code.  When I move the DropDownList out of that user control and into the one that's creating it, it works.  The problem is, I need the DropDownList to work in the dynamically created user control.

I create a RadTab and RadPageView for each party in my record set.  Then once the tab and page view are created, it inserts a user control with the party's information on it.  The DropDownList filter's the party's information.

ucHistoryTabs.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ucHistoryTabs.ascx.cs" Inherits="ucHistoryTabs" %>

<div style="width: 100%; padding:0px 0px 10px 0px;">
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:Label runat="server" ID="ErrorMessageLabel" Text="" Visible="false" style="font-size: x-large; color:red" />
            <telerik:RadTabStrip ID="PartyTabStrip" runat="server" MultiPageID="HistorysPages" Skin="" Width="100%" ScrollChildren="true" ScrollButtonsPosition="Right">
                <Tabs></Tabs>
            </telerik:RadTabStrip>
            <telerik:RadMultiPage ID="HistorysPages" runat="server" Width="95%"></telerik:RadMultiPage>
        </ContentTemplate>
    </asp:UpdatePanel>
</div>

ucHistoryTabs.ascx.cs

public void BuildTabs(List<PartyInfo> allPartyInfos)
{
    try
    {
        List<int> partyIDs = new List<int>();
        partyIDs = allPartyInfos.Select(i => i.PartyID).Distinct().ToList();

        foreach (int partyID in partyIDs)
        {
            List<PartyInfo> infoByParty = new List<PartyInfo>();
            infoByParty.Clear();
            infoByParty = allPartyInfos.Where(i => i.PartyID == partyID).ToList();

            string partyName = string.Empty;
            if (infoByParty.Count > 0)
                partyName = infoByParty[0].PartyName;

            //first check to see if the tab exists before creating it.
            if (PartyTabStrip.Tabs.Where(t => t.Text == partyName).Count() < 1)
            {
                #region Tab
                Telerik.Web.UI.RadTab tab = new Telerik.Web.UI.RadTab();
                tab.CssClass = "radtab-alltabs";
                tab.SelectedCssClass = "radtab-selectedtab";
                tab.Text = partyName;
                tab.Value = "p_" + partyID.ToString();
                tab.PageViewID = "p_" + partyID.ToString();
                PartyTabStrip.Tabs.Add(tab);
                #endregion

                #region Page
                Telerik.Web.UI.RadPageView page = new Telerik.Web.UI.RadPageView();
                page.ID = "p_" + partyID.ToString();

                if (infoByParty.Count > 0)
                {
                    ucHistoryDisplay ucWHD = (ucHistoryDisplay)LoadControl("~/ucHistoryDisplay.ascx");
                    ucWHD.FillData(infoByParty);
                    ucWHD.ID = "d_" + partyID.ToString();
                    page.Controls.Add(ucWHD);
                }
                else
                {
                    System.Web.UI.WebControls.Label lbl = new System.Web.UI.WebControls.Label();
                    lbl.ID = "d_" + partyID.ToString();
                    lbl.Text = "No records found";
                    page.Controls.Add(lbl);
                }
                #endregion
                HistorysPages.PageViews.Add(page);
            }
        }
        if (PartyTabStrip.Tabs.Count > 0)
            PartyTabStrip.Tabs[0].Selected = true;
        if (HistorysPages.PageViews.Count > 0)
            HistorysPages.PageViews[0].Selected = true;
    }
    catch (Exception ex) { ThrowError(ex, "BuildTabs"); }
}

ucHistoryDisplay.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ucHistoryDisplay.ascx.cs" Inherits="uctHistoryDisplay" %>

<div style="padding-left:20px;">
    <asp:Table runat="server" ID="FilterControls" Width="100%">
        <asp:TableRow>
            <asp:TableCell>Status</asp:TableCell>
            <asp:TableCell>
                <telerik:RadDropDownList runat="server" ID="StatusDropDown" OnSelectedIndexChanged="StatusDropDown_SelectedIndexChanged" AutoPostBack="true" AppendDataBoundItems="true">
                    <Items>
                        <telerik:DropDownListItem Text="-- ALL --" Selected="true" />
                    </Items>
                </telerik:RadDropDownList>
            </asp:TableCell>
            <asp:TableCell>Type</asp:TableCell>
            <asp:TableCell>
                <telerik:RadDropDownList runat="server" ID="TypeDropDown" OnSelectedIndexChanged="TypeDropDown_SelectedIndexChanged" AutoPostBack="true" AppendDataBoundItems="true">
                    <Items>
                        <telerik:DropDownListItem Text="-- ALL --" Selected="true" />
                    </Items>
                </telerik:RadDropDownList>
            </asp:TableCell>
            <asp:TableCell>Number of Records</asp:TableCell>
            <asp:TableCell><asp:label runat="server" ID="Count" /></asp:TableCell>
        </asp:TableRow>
    </asp:Table>
</div>

<telerik:RadGrid ID="HistoryRadGV" runat="server" AutoGenerateColumns="false" ShowHeader="false"
                Skin="" style="padding-left: 0px; width: 100%" ItemStyle-BackColor="#FFFFFF"
                AlternatingItemStyle-BackColor="#F5F5F5" OnItemDataBound="HistoryRadGV_ItemDataBound">
</telerik:RadGrid>

ucHistoryDisplay.ascx.cs

        public void FillData(List<PartyInfo> selectedInfo)
        {
            try
            {
                List<string> myStatuses = new List<string>();
                myStatuses = selectedInfo.Select(w => w.Status).Distinct().OrderBy(q => q).ToList();
                StatusDropDown.DataSource = myStatuses;
                StatusDropDown.DataBind();

                List<string> myTypes = new List<string>();
                myTypes = selectedInfo.Select(w => w.Type).Distinct().OrderBy(q => q).ToList();
                TypeDropDown.DataSource = myTypes;
                TypeDropDown.DataBind();

                Count.Text = selectedInfo.Count.ToString();

                HistoryRadGV.DataSource = selectedInfo;
                HistoryRadGV.DataBind();
            }
            catch (Exception ex)
            {
                ThrowError(ex, "FillData");
            }
        }

        protected void StatusDropDown_SelectedIndexChanged(object sender, Telerik.Web.UI.DropDownListEventArgs e)
        {
//do stuff
}

        protected void WarrantTypeDropDown_SelectedIndexChanged(object sender, Telerik.Web.UI.DropDownListEventArgs e)
        {
//do stuff
}

Presumably, because I create this user control dynamically, the SelectedIndexChanged events never fire when I change the DropDownList.

 

Thoughts?

 

[Ivan Danchev]

Hello Jeremy,

I replied to the identical thread you started in the Ticketing System. If you have any further questions on this subject you can ask them there. 

Regards,
Ivan Danchev
Telerik

[Panayiotis]

Hi,

 

I know that this is an old post but I have the same problem.

 

what was the solution??

[Marin Bratanov]

Hi Panayiotis,

If Jeremy doesn't get a chance to respond and provide details, here is a short summary of the private thread (I cannot go into too much details as it is private) - the issue was coming from the dynamic control generation. The key point was that the controls had to be re-created with the correct IDs (the same with each postback) and to ensure that there is only one control with one ID and the .Clear() method of a Controls collection could be used to remove prior duplicates in case the control createion logic needs to run twice on the same page lifecycle.

Regards,
Marin Bratanov
Progress Telerik