DxWindow.Showing Event

Fires before the Window is displayed.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.2.dll

NuGet Package: DevExpress.Blazor

Declaration

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

Event Data

The Showing event's data class is WindowShowingEventArgs. 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

Handle the Showing event to process show actions. You can set the event argument’s Cancel property to true to cancel a show action. This event occurs in the following cases:

• You set the Visible property to true.
• You call the ShowAsync or ShowAtAsync method.

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

The following example displays the window only after users enable the checkbox:

<div>
    <DxCheckBox @bind-Checked="@Checked">
        Allow Window
    </DxCheckBox>
    @*...*@
    <DxButton RenderStyle="ButtonRenderStyle.Secondary"
          Click="OnShowAtPositionClick">SHOW A WINDOW</DxButton>
</div>

<DxWindow HeaderText="Header"
          BodyText="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris sit amet metus vel
             nisi blandit tincidunt vel efficitur purus. Nunc nec turpis tempus, accumsan orci auctor,
             imperdiet mauris. Fusce id purus magna."
          Width="max(25vw, 250px)"
          @ref=WindowRef
          Showing="WindowShowing"
          Shown="WindowShown">
</DxWindow>

@code {
    DxWindow WindowRef;
    bool Checked { get; set; }
    bool WindowVisible { get; set; }

    void WindowShowing(WindowShowingEventArgs args) {
        args.Cancel = !Checked;
    }

    void WindowShown(WindowShownEventArgs args) {
        Checked = false;
    }

    async Task OnShowAtPositionClick(MouseEventArgs args) {
        await WindowRef.ShowAtAsync(args.ClientX, args.ClientY);
    }
}