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Expanding and Collapsing All Nodes

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.

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

function treeExpandAllNodes() {
    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();
        }
    }
}

function treeCollapseAllNodes() {
    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].collapse();
        }
    }
}
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
    <telerik:RadTreeView RenderMode="Lightweight" 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="javascript: treeExpandAllNodes();" class="RadTreeView_Hay">Expand All Nodes</a>
    <a href="javascript: treeCollapseAllNodes();" class="RadTreeView_Hay">Collapse All Nodes</a>
</div>
</form>

See Also