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Validate a nested control

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ComboBox

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Gene asked on 23 Dec 2009, 05:00 PM

I have a RadComboBox that has a RadTreeView. I would like to make the field required and am having a little trouble putting it together in my head. I need to make sure that a non-root level node is selected in the tree. Anyone have any advice on how to accomplish this? I thinking that a RequiredFieldValidator is out of the question and I'll probably need to go the CustomValidator route.
Any help appreciated.

Here is my markup:

    
            <telerik:RadComboBox ID="ProjectRadComboBox" AllowCustomText="True" EmptyMessage="[Choose One...]" 
        
                runat="server" Width="150px">  
        
                <ItemTemplate> 
        
                    <div onclick="StopPropagation(event)">  
        
                        <telerik:RadTreeView ID="ProjectRadTreeView" runat="server" DataTextField="project_name" 
        
                            DataValueField="project_id" DataFieldID="project_id" DataFieldParentID="fk_precinct_id" 
        
                            OnClientNodeClicking="OnClientNodeClickingHandler" OnNodeExpand="ProjectRadComboBox_NodeExpand" 
        
                            Height="300px">  
        
                        </telerik:RadTreeView> 
        
                    </div> 
        
                </ItemTemplate> 
        
                <Items> 
        
                    <telerik:RadComboBoxItem runat="server" Text="[Choose One...]" Value="[Choose One...]" Selected="True" /> 
        
                </Items> 
        
            </telerik:RadComboBox>

1 Answer, 1 is accepted

answered on 23 Dec 2009, 10:01 PM

Well I think it is as simple as adding a RequiredFieldValidator.

    
            <telerik:RadComboBox ID="ProjectRadComboBox" AllowCustomText="True" EmptyMessage="[Choose One...]" 
        
                runat="server" Width="150px">  
        
                <ItemTemplate> 
        
                    <div onclick="StopPropagation(event)">  
        
                        <telerik:RadTreeView ID="ProjectRadTreeView" runat="server" DataTextField="project_name" 
        
                            DataValueField="project_id" DataFieldID="project_id" DataFieldParentID="fk_precinct_id" 
        
                            OnClientNodeClicking="OnClientNodeClickingHandler" OnNodeExpand="ProjectRadComboBox_NodeExpand" 
        
                            Height="300px">  
        
                        </telerik:RadTreeView> 
        
                    </div> 
        
                </ItemTemplate> 
        
                <Items> 
        
                    <telerik:RadComboBoxItem /> 
        
                </Items> 
        
            </telerik:RadComboBox> 
        
            <asp:RequiredFieldValidator ID="rfvProjects" runat="server" ControlToValidate="ProjectRadComboBox" 
        
                CssClass="error_message" Display="Dynamic" ErrorMessage="Required" InitialValue="[Choose One...]" 
        
                SetFocusOnError="True" ValidationGroup="sdg"></asp:RequiredFieldValidator>