RadComboBox inside RadWindow

[Mohamed Ramadan]

Hello Sir,

We use RadComboBox inside RadWindow as the following:

<telerik:RadWindow ID="WinFirms" runat="server" Title="Select Firm" Width="500" Height="200" Behaviors="Move"  VisibleStatusbar="false"
    VisibleOnPageLoad="false" Modal="true" EnableShadow="true" DestroyOnClose="false" Skin="Sunset">
    <ContentTemplate>
    <div style="padding:10px;">
        <div style="float:left; width:10px;">
        Firm:
        </div>
        <div>
            <telerik:RadComboBox runat="server" ID="ddlFirm" Width="100%" MarkFirstMatch="True" CausesValidation="false" HighlightTemplatedItems="true">
                <HeaderTemplate>
                        <table style="width:95%" cellspacing="0" cellpadding="0" class="MultiColumnComboBox">
                            <tr>
                                <td style="width: 50px">DFSA No</td>
                                <td style="width: 100px">Firm Name</td>
                                <td style="width: 50px">Capacity</td>
                            </tr>
                        </table>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <table style="width:100%" cellspacing="0" cellpadding="0" class="MultiColumnComboBox">
                            <tr>
                                <td style="width: 20%; color:Gray;"><%#DataBinder.Eval(Container.DataItem, "DfsaNo")%> </td>
                                <td style="width: 70%"><%#DataBinder.Eval(Container.DataItem, "DName")%></td>
                                <td style="width: 10%; color:Gray;"><%#DataBinder.Eval(Container.DataItem, "Capacity")%></td>
                            </tr>
                        </table>
                    </ItemTemplate>
                </telerik:RadComboBox>
        </div>
        </div>
        <div style="text-align:center;">
            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Firm is required" Display="Dynamic" ControlToValidate="ddlFirm"></asp:RequiredFieldValidator>
            <asp:Button runat="server" id="WinOK" OnClientClick="SubmitFirmDialog();return false;" Text="OK" UseSubmitBehavior="False" ValidationGroup="SubmitWindow" CausesValidation="true"/>
            <asp:Button runat="server" id="WinCancel" OnClientClick="Hide();return false;" Text="Cancel" UseSubmitBehavior="False"  />
        </div>
    </ContentTemplate>
</telerik:RadWindow>

We Fill DDL as following

Sub LoadFirmData()
        ddlFirm.DataSource = FirmDetails.GetAfAspRaFirmByVal()
        ddlFirm.DataBind()
End Sub

We set the values inside ItemDataBound even handler after binding it

Protected Sub ddlFirm_ItemDataBound(ByVal sender As Object, ByVal e As Telerik.Web.UI.RadComboBoxItemEventArgs) Handles ddlFirm.ItemDataBound
        e.Item.Text = e.Item.DataItem.DName
        e.Item.Value = e.Item.DataItem.PersonID & "%" & e.Item.DataItem.Capacity
        e.Item.Attributes.Add("FirmID", e.Item.DataItem.PersonID)
        e.Item.Attributes.Add("Capacity", e.Item.DataItem.Capacity)
        e.Item.Attributes.Add("DfsaNo", e.Item.DataItem.DfsaNo)
    End Sub

First page Load the data loads successfully and displayed inside the ComboBox.

 

When a callback happens the ComboBox loads all data as empty as the following HTML:

 

<li class="rcbItem  rcbTemplate">

    <table cellspacing="0" cellpadding="0" class="MultiColumnComboBox" style="width: 100%;">

        <tbody><tr>

            <td style="width: 20%; color: Gray;">&nbsp;</td>

            <td style="width: 70%;"></td>

            <td style="width: 10%; color: Gray;"></td>

        </tr>

    </tbody></table>

</li>

 

At the same time when we assess the list items on client side we get the results of (value + attributes) correctly. But its not displayed in the dropdown.

 

[Simon]

Hello Mohamed Ramadan,

This can happen if the RadComboBox' DataBind method (in LoadFirmData) is not called on this callback you mentioned. Please make sure you always bind the ComboBox whenever you need its Items (and Templates) loaded.

Best wishes,
Simon
the Telerik team