RadTreeView for ASP.NET AJAX
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RadControls for ASP.NET AJAX

HOW-TOHave a disabled node which can be expanded and collapsed, but not clicked.

DESCRIPTIONDisabled nodes cannot be selected, expanded and collapsed by design. Sometimes you might need a node which looks like disabled, cannot be selected, but still be expandable and collapsible.

SOLUTIONTo achieve the task we will leave the node enabled, but we will add an additional CSS class ("rtDisabled") to its parentElement. This will give the node a "disabled" look. We will assign a category "Disabled" to the node so we can distinguish it from the others. To prevent selecting that node we will subscribe to the OnClientNodeClicking event and cancel the event if that node is clicked.

CopyASPX
<telerik:RadTreeView ID="RadTreeView1" OnClientNodeClicking="OnClientNodeClickingHandler"
    runat="server">
    <Nodes>
        <telerik:RadTreeNode runat="server" Text="Root RadTreeNode1" Category="Disabled">
            <Nodes>
                <telerik:RadTreeNode runat="server" Text="Child RadTreeNode 1">
                </telerik:RadTreeNode>
                <telerik:RadTreeNode runat="server" Text="Child RadTreeNode 2">
                </telerik:RadTreeNode>
            </Nodes>
        </telerik:RadTreeNode>
    </Nodes>
</telerik:RadTreeView>
CopyJavaScript
        function pageLoad() {
            var tree = $find("<%= RadTreeView1.ClientID %>");
            var nodes = tree.get_allNodes();

            for (var i = 0; i < nodes.length; i++) {
                var node = nodes[i];
                if (node.get_category() == "Disabled") {
                    node.get_textElement().parentElement.className += " rtDisabled";
                }
            }
        }

        function OnClientNodeClickingHandler(sender, eventArgs) {
            var node = eventArgs.get_node();
            if (node.get_category() == "Disabled") {
                eventArgs.set_cancel(true);
            }
        }

Here is how you can add "disabled" nodes from the code-behind.