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Treeview validation

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Ivan Queiroz
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Ivan Queiroz asked on 27 Apr 2010, 04:54 PM
This should be pretty straightforward, but for some reason, I cannot get treeview to validate properly: the required field validator fails to see when a node is checked, even if ALL nodes are checked. This is a sample code:

    <asp:ValidationSummary ID="ValidationSummary1" runat="server" HeaderText="Please review the following errors:" ShowMessageBox="True" ShowSummary="false" DisplayMode="BulletList" /> 
 
    <telerik:RadTreeView ID="RadTreeViewStates" runat="server" CheckBoxes="true" CheckChildNodes="true" TriStateCheckBoxes="true" LoadingMessage="Loading states" Skin="Office2007"
        <Nodes> 
            <telerik:RadTreeNode Checkable="true" Text="All States" Expanded="true"
                <Nodes> 
                    <telerik:RadTreeNode Checkable="true" Text="Northeast"
                        <Nodes> 
                            <telerik:RadTreeNode Checkable="true" Text="CT" Value="CT"></telerik:RadTreeNode> 
                            <telerik:RadTreeNode Checkable="true" Text="MA" Value="MA"></telerik:RadTreeNode> 
                            <telerik:RadTreeNode Checkable="true" Text="ME" Value="CT"></telerik:RadTreeNode> 
                            <telerik:RadTreeNode Checkable="true" Text="NH" Value="CT"></telerik:RadTreeNode> 
                            <telerik:RadTreeNode Checkable="true" Text="NY" Value="CT"></telerik:RadTreeNode> 
                            <telerik:RadTreeNode Checkable="true" Text="PA" Value="CT"></telerik:RadTreeNode> 
                            <telerik:RadTreeNode Checkable="true" Text="RI" Value="CT"></telerik:RadTreeNode> 
                            <telerik:RadTreeNode Checkable="true" Text="VT" Value="CT"></telerik:RadTreeNode> 
                        </Nodes> 
                    </telerik:RadTreeNode>                   
                </Nodes> 
            </telerik:RadTreeNode> 
        </Nodes> 
    </telerik:RadTreeView> 
 
    <asp:RequiredFieldValidator ID="rvRadTreeViewStates" runat="server" ErrorMessage="Please select at least one state" Display="Dynamic" ControlToValidate="RadTreeViewStates">*</asp:RequiredFieldValidator> 
 
    <asp:Button ID="ButtonSaveSearch" runat="server" Text="Save"  /> 
 

The above is similar to the Validation Selection demo. Am I missing something?

Thanks,

Ivan

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Yana
Telerik team
answered on 29 Apr 2010, 08:57 AM
Hi Ivan,

By default RequiredFieldValidator validates whether a node is selected. This help article explains how you can validate by checked nodes.

Best wishes,
Yana
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Shinu
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answered on 29 Apr 2010, 08:59 AM

Hi Ivan,

The behaviour is expected since the RadTreeViewStates.SelectedValue will be "null" evenif there is some nodes checked. So one suggestion would be selecting/unselecting the node whenever checkbox is checked/unchecked. You can perform this from client side.

JavaScript:

 
<script type="text/javascript">  
    function OnClientNodeChecked(sender, args) {  
        var node = args.get_node()  
        node.set_selected(node.get_checked());  
    }  
</script> 

[Attach the OnClientNodeChecked event to RadTreeView]

-Shinu.

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Michael Love
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answered on 25 Jun 2010, 06:10 PM
So, I really don't want to have to "select" my tree row. Are there other options?

Mike
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Michael Love
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answered on 25 Jun 2010, 07:44 PM
Actually, I looked at the link provided and used a Custom validator.

Thanks, Mike
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Ivan Queiroz
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Yana
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Shinu
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Michael Love
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