DxFlyout.Showing Event

Fires before the flyout window is displayed.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v23.2.dll

NuGet Package: DevExpress.Blazor

Declaration

[Parameter]
public EventCallback<FlyoutShowingEventArgs> Showing { get; set; }

Event Data

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

Property	Description
Cancel	Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs.
CancellationToken	Specifies an object that propagates a cancellation notification.

Remarks

The Showing event fires before the flyout window is displayed and allows you to cancel the action. This event occurs in the following cases:

• You set the IsOpen property to true.
• You call the ShowAsync method.

Set the event argument’s Cancel property to true to cancel the action.

You can handle the Shown event that fires after the flyout window is displayed. To process close actions, handle the Closing and Closed events.

The following example allows users to display the flyout window only after they enable the checkbox:

<div>
    <DxCheckBox @bind-Checked="@Checked">Allow flyout Window</DxCheckBox>
    <DxButton Id="button" Text="Show" Click="() => IsOpen = true" />
</div>

<DxFlyout @bind-IsOpen="@IsOpen"
            HeaderText="Header"
            BodyText="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris sit amet metus vel
             nisi blandit tincidunt vel efficitur purus."
            Width="400"
            PositionTarget="#button" Position="FlyoutPosition.LeftStart"
            Showing="WindowShowing"
            Shown="WindowShown">
</DxFlyout>
@code {
    bool Checked { get; set; }
    bool IsOpen { get; set; }

    void WindowShowing(FlyoutShowingEventArgs args) {
        args.Cancel = !Checked;
    }
    void WindowShown(FlyoutShownEventArgs args) {
        Checked = false;
    }
}