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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

C#
[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:

Razor
<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";
    }
}

See Also