DxAccordion.BeforeExpand Event

Fires when an item 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<AccordionItemCancelEventArgs> BeforeExpand { get; set; }

Event Data

The BeforeExpand event's data class is AccordionItemCancelEventArgs. The following properties provide information specific to this event:

Property	Description
Cancel	Specifies whether the action that raised the event should be canceled.
CausedByAPI	Obsolete. Specifies whether an event was triggered by user action or from code. Inherited from AccordionItemStateChangeEventArgs.
ItemInfo	Returns information about an item related to the event. Inherited from AccordionItemEventArgs.
Reason	Returns the reason why the Accordion item’s expansion state changed. Inherited from AccordionItemStateChangeEventArgs.

Remarks

The following code snippet cancels the expand action for root-level nodes:

<DxAccordion BeforeExpand="@BeforeExpand">
    @* ... *@
</DxAccordion>

@code  {
    void BeforeExpand(AccordionItemCancelEventArgs e) {
        if (args.ItemInfo.Level == 0) args.Cancel = true;
    }
}