[Solved] RadComboBox items are gone upon Ajax callback

[Chris Shi]

Hi,
I am updating the content of one combo box with another combo box through AjaxManager.

    <asp:ScriptManager ID="ScriptManager1" runat="server" />
    <telerik:RadAjaxManager ID="AjaxManager1" runat="server">
        <AjaxSettings>
            <telerik:AjaxSetting AjaxControlID="ddlProductGroup">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="ddlProductCategory"></telerik:AjaxUpdatedControl>
                    <telerik:AjaxUpdatedControl ControlID="ddlCategory"></telerik:AjaxUpdatedControl>
                </UpdatedControls>
            </telerik:AjaxSetting>
        </AjaxSettings>
    </telerik:RadAjaxManager>

In the code above ddlProductGroup and ddlProductCategory are RadComboBox and ddlCategory is a standard asp:dropdownlist.  Upon callback, I bind the same datasource object to ddlProductCategory and ddlCategory; however only ddlCategory is populated with data and ddlProductCategory has no data. 

Here is the code for binding controls:
        private void ddlProductGroup_SelectedIndexChanged(object o, RadComboBoxSelectedIndexChangedEventArgs e)
        {
            this.ProductCategories = _presenter.EligibleProductCategories();
            this.Categories = _presenter.EligibleProductCategories();
        }

When I replace the Ajax callback with a standard postback, the problem goes away.  Does anyone have a solution for this? 

Thanks,
Chris

[Veselin Vasilev]

Hi Chris Shi,

I tried to reproduce the problem, but to no avail.
Please find attached my test page. Download it and give it a try.


Greetings,
Veskoni
the Telerik team

Instantly find answers to your questions at the new Telerik Support Center

[Chris Shi]

Hi Veskoni,
Thanks for your reply. I tried out your code, and it's having the same problem. Basically, once i click on the first dropdown, the second dropdown is only populated with one item -- "RadComboBoxItem2 child 1".  Another issue I have with Telerik is the intellisense does not show up in my html view. I'm using Telerik.Web.UI.dll (version 2008.1.415.35) and visual studio 2008 pro. Thanks.

[Michael Prosper]

Hi Chris,

Any luck with this problem?  I'm experiencing the same thing with the RadAjaxManager - Multiple databound RadComboBoxes working fine if I do a regular postback or enclosed in a RadAjaxPanel, but as soon as I try to use the Manager, the databound items disappear when the panel refreshes.

I'll submit a support request if there's no resolution here, but I thought I might ping you first.

[Chris Shi]

Michael, I have not found a solution; however the following link points to a demo that provides a workaround for what i'm trying to do:

http://www.telerik.com/DEMOS/ASPNET/Prometheus/ComboBox/Examples/Functionality/MultipleComboBoxes/DefaultCS.aspx

The demo shows how to populate combo boxes upon selecting items in another combo box in a call-back fashion.

chris

[Veselin Vasilev]

Hi guys,

I have created a small video that shows that this scenario works fine on my side.

Please download it and give it a try. What is different in your case?

Kind regards,
Veskoni
the Telerik team

Instantly find answers to your questions at the new Telerik Support Center