Combobox selected value is null

[kd]

Hi All,
I have 2 comboboxes on page both i have bind load on demand, both are working well but i want to get selected value of first combobox on second combobox OnItemsRequested Event but when second combobox event OnItemsRequested fires the selected value of first combobox is null my code is follws

<telerik:RadComboBox ID="rcbCategory" runat="server" EmptyMessage="Select Category"
                            OnItemsRequested="rcbCategory_OnItemsRequested" EnableLoadOnDemand="true" EnableViewState="true">
                        </telerik:RadComboBox>

<telerik:RadComboBox ID="rcbSubCategory" runat="server" OnItemsRequested="rcbSubCategory_OnItemsRequested"
                            EnableLoadOnDemand="true" EmptyMessage="Select Sub-Category">
                        </telerik:RadComboBox>


C#
protected void rcbCategory_OnItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)
        {
            rcbCategory.DataSource = Category.GetAll();
            rcbCategory.DataValueField = "ID";
            rcbCategory.DataTextField = "CategoryName";
            rcbCategory.DataBind();
        }

        protected void rcbSubCategory_OnItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)
        {
            rcbSubCategory.DataSource = SubCategory.GetAll(rcbCategory.SelectedValue);
            rcbSubCategory.DataValueField = "ID";
            rcbSubCategory.DataTextField = "CategoryName";
            rcbSubCategory.DataBind();
        }

[Ivana]

Hi,

You could try the following:

<telerik:RadComboBox ID="rcbCategory" runat="server" EmptyMessage="Select Category"
    OnClientSelectedIndexChanged="OnClientSelectedIndexChanged" OnItemsRequested="rcbCategory_OnItemsRequested"
    EnableLoadOnDemand="true" EnableViewState="true">
</telerik:RadComboBox>
<telerik:RadComboBox ID="rcbSubCategory" runat="server" OnItemsRequested="rcbSubCategory_OnItemsRequested"
    EnableLoadOnDemand="true" EmptyMessage="Select Sub-Category" >
</telerik:RadComboBox>
<asp:HiddenField runat="server" ID="hiddenField1" Value=" " />
<script type="text/javascript">
    function OnClientSelectedIndexChanged(sender, args) {
        $find("<%= rcbSubCategory.ClientID%>").requestItems(args.get_item().get_value());
    }
</script>

protected void rcbSubCategory_OnItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)
{
    string rcbCategory_SelectedValue = e.Text;
}

You could refer to the following help article for more information of load on demand: Load On Demand Overview and the implementation of the online demo: Related ComboBoxes.

Regards,
Ivana
the Telerik team