DxTreeViewNode.ExpandedChanged Event

Fires when a TreeView’s node expands or collapses.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.2.dll

NuGet Package: DevExpress.Blazor

Declaration

[Parameter]
public EventCallback<bool> ExpandedChanged { get; set; }

Parameters

Type	Description
Boolean	The new Expanded property value.

Remarks

The ExpandedChanged event allows you to handle changes to the node’s Expanded property value. The following code snippet changes the node’s Text when a user expands or collapses the node:

<div style="width: 280px">
    <DxTreeView>
        <Nodes>
            <DxTreeViewNode Name="Overview" Text="Overview" NavigateUrl="https://demos.devexpress.com/blazor/" />
            <DxTreeViewNode ExpandedChanged=@ExpandedChanged
                            Name="Editors" 
                            Text=@NodeText>
                <Nodes>
                    <DxTreeViewNode Text="Combobox" NavigateUrl="https://demos.devexpress.com/blazor/ComboBox" />
                    <DxTreeViewNode Text="Spin Edit" NavigateUrl="https://demos.devexpress.com/blazor/SpinEdit" />
                </Nodes>
            </DxTreeViewNode>
            <DxTreeViewNode Text="Navigation and Layout">
                <Nodes>
                    <DxTreeViewNode Name="FormLayout" Text="Form Layout" NavigateUrl="https://demos.devexpress.com/blazor/FormLayout" BadgeText="Upd" />
                    <DxTreeViewNode Name="TreeView" Text="TreeView" NavigateUrl="https://demos.devexpress.com/blazor/TreeView" BadgeText="New"  />
                    <DxTreeViewNode Name="Tabs" Text="Tabs" NavigateUrl="https://demos.devexpress.com/blazor/Tabs" Visible="false" BadgeText="New" />
                </Nodes>
            </DxTreeViewNode>
        </Nodes>
    </DxTreeView>
</div>

@code {
    string NodeText { get; set; } = "Show Data Editors";
    void ExpandedChanged(bool Expanded) {
        if(Expanded)
            NodeText = "Close Data Editors";
        else
            NodeText = "Show Data Editors";
    }
}