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

To expand or collapse all nodes:

  • Retrieve a reference to the RadTreeView client side instance using the $find() helper function.

  • Get an collection of all the nodes using the get_allNodes() function.

  • Iterate the collection and check each node. If child nodes exist for the node, call the expand() or collapse() functions.

CopyJavaScript
var treeView = $find("<%= RadTreeView2.ClientID %>");
var nodes = treeView.get_allNodes();
for (var i = 0; i < nodes.length; i++) {
    if (nodes[i].get_nodes() != null) {
        nodes[i].expand();
    }
}

The example below adds a RadTreeView and two links to a form. The links trigger functions get the RadTreeView client instance, retrieve all the nodes for the RadTreeView and iterate the nodes. Nodes with children are expanded or collapsed.

 
RadTreeView How To

CopyASPX
<script language="javascript" type="text/javascript">

    function treeExpandAllNodes() {
        var treeView = $find("<%= RadTreeView2.ClientID %>");
        var nodes = treeView.get_allNodes();
        for (var i = 0; i < nodes.length; iif (nodesi].get_nodes=null) {
                nodesi].expandfunction treeCollapseAllNodesvar treeView=find("<%= RadTreeView2.ClientID");
        var nodes = treeView.get_allNodes();
        for (var i = 0; i < nodes.length; i++) {
            if (nodes[i].get_nodes() != null) {
                nodes[i].collapse();
            }
        }
    }
</script>

<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
    <telerik:RadTreeView ID="RadTreeView2" runat="server" Skin="Hay">
        <nodes>
            <telerik:RadTreeNode runat="server" Text="Products" ExpandMode="ClientSide">
                <Nodes>
                    <telerik:RadTreeNode runat="server" Text="Books" ExpandMode="ClientSide">
                        <Nodes>
                            <telerik:RadTreeNode runat="server" Text="Fiction">
                            </telerik:RadTreeNode>
                            <telerik:RadTreeNode runat="server" Text="Non-Fiction">
                            </telerik:RadTreeNode>
                            <telerik:RadTreeNode runat="server" Text="Biography">
                            </telerik:RadTreeNode>
                            <telerik:RadTreeNode runat="server" Text="Humor">
                            </telerik:RadTreeNode>
                        </Nodes>
                    </telerik:RadTreeNode>
                </Nodes>
            </telerik:RadTreeNode>
        </nodes>
    </telerik:RadTreeView>
    <a href="javascripttreeExpandAllNodes();" class="RadTreeView_Hay">Expand All Nodes</a>
    <a href="javascript: treeCollapseAllNodes();" class="RadTreeView_Hay">Collapse All Nodes</a>
</div>
</form>

See Also