DxTreeView.BeforeExpand Event
Fires when a node is about to be expanded and allows you to cancel the action.
Namespace: DevExpress.Blazor
Assembly: DevExpress.Blazor.v24.2.dll
NuGet Package: DevExpress.Blazor
#Declaration
[Parameter]
public Action<TreeViewNodeCancelEventArgs> BeforeExpand { get; set; }
#Event Data
The BeforeExpand event's data class is TreeViewNodeCancelEventArgs. The following properties provide information specific to this event:
Property | Description |
---|---|
Cancel | Specifies whether the action that raised the event should be canceled. |
Caused |
Obsolete. Specifies whether an event was triggered by a user action or programmatically.
Inherited from Tree |
Node |
Returns information about a node related to the event.
Inherited from Tree |
Reason |
Returns the reason why the Tree |
#Remarks
The BeforeExpand
event fires before a node is expanded. The following code sample handles the BeforeExpand
event.
<DxTreeView BeforeExpand="@BeforeExpand">
...
</DxTreeView>
@code {
void BeforeExpand(TreeViewNodeCancelEventArgs e) {
// your code
// to cancel the node expanding, set the Cancel property to true
// e.Cancel = true;
}
}