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ASPxClientTreeList.ExpandNode(key) Method

Expands the specified node preserving the collapsed state of child nodes.

Declaration

ExpandNode(key: string): void

Parameters

Name Type Description
key string

A String value that uniquely identifies the node.

Remarks

To expand all nodes, use the ASPxClientTreeList.ExpandAll method. To collapse the specified node, use the ASPxClientTreeList.CollapseNode method.

To learn more, see Expanding and Collapsing Nodes.

Examples

This example demonstrates how to use the GetFocusedNodeKey method to expand and collapse tree nodes based on the state of a node (collapsed or expanded). You can get the node state by calling the GetNodeState(nodeKey) method in the FocusedNodeChanged event.

Demo limitation: if you close the topmost parent node and do not have other nodes except that one, you will have to expand this node by clicking the Expand Button.

<script>
    function OnFocusedNodeChange(s, e) {
        var nodeKey = s.GetFocusedNodeKey();
        var nodeState = s.GetNodeState(nodeKey);

        if (nodeState === "Collapsed")
            s.ExpandNode(nodeKey);
        else if (nodeState === "Expanded")
            s.CollapseNode(nodeKey);
    };
</script>
<dx:ASPxTreeList ID="TreeList"
    runat="server"
    AutoGenerateColumns="False" 
    DataSourceID="ProductsDataSource" 
    KeyFieldName="EmployeeID" 
    ParentFieldName="ReportsTo"
    Width="50%">
    <Columns>
        <dx:TreeListTextColumn FieldName="EmployeeID" VisibleIndex="0" ReadOnly="true"></dx:TreeListTextColumn>
        <dx:TreeListTextColumn FieldName="LastName" VisibleIndex="1"></dx:TreeListTextColumn>
        <dx:TreeListTextColumn FieldName="FirstName" VisibleIndex="2"></dx:TreeListTextColumn>
    </Columns>
    <SettingsBehavior AllowFocusedNode="true" FocusNodeOnLoad="false" />
    <ClientSideEvents FocusedNodeChanged="OnFocusedNodeChange" />
</dx:ASPxTreeList>
<br />

<asp:AccessDataSource ID="ProductsDataSource" runat="server"
    DataFile="~/App_Data/nwind.mdb"
    SelectCommand="SELECT [EmployeeID], [LastName], [FirstName], [ReportsTo] FROM [Employees]">
</asp:AccessDataSource>
See Also