DxWindow.Closing Event

Fires before the Window is closed.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v23.2.dll

NuGet Package: DevExpress.Blazor

Declaration

[Parameter]
public EventCallback<WindowClosingEventArgs> Closing { get; set; }

Event Data

The Closing event's data class is WindowClosingEventArgs. 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.
CloseReason	Identifies the action that closes the Window.

Remarks

Handle the Closing event to process close actions. Use the event argument’s CloseReason property to identify which action closes the Window. You can set the Cancel property to true to cancel a close action.

Close Reason	Description
CloseButtonClick	A user clicks a custom Close button (if you called the predefined CloseCallback to create this button).
EscapePress	A user presses Escape.
Programmatically	You set the Visible property to false or call the CloseAsync method.

You can also handle the Closed event that fires after the Window is closed. To process show actions, handle the Showing and Shown events.

In the following example, neither the Close button in the header nor the custom OK button closes the Window until a user enables the checkbox in the footer:

<DxButton Id="showDDbtton" Click="() => IsOpen = true">SHOW A WINDOW</DxButton>
<DxWindow Width="400"
            @bind-IsOpen="@IsOpen"
            ShowFooter="true"
            HeaderText="DevExpress EULA"
            Closing="EulaClosing"
            Closed="EulaClosed">
    <BodyTextTemplate>
        <p>
            The terms of our license are fully outlined/described in the Developer Express Inc End User
            License Agreement (EULA) included with our product installations. Before you can install and use
            a Developer Express Inc product, you must read, understand and accept the terms/conditions of
            our EULAs. <a target="" _blank"" rel="" noopener noreferrer"" href="" https: //www.devexpress.com/support/eulas/"">More info...</a>
        </p>
    </BodyTextTemplate>
    <FooterTextTemplate>
        <DxCheckBox style="margin-left: 0; margin-right: auto;" @bind-Checked="@EulaAccepted">
            I accept the terms of the EULA
        </DxCheckBox>
        <DxButton RenderStyle="ButtonRenderStyle.Primary" Text="OK" Click="context.CloseCallback" />
    </FooterTextTemplate>
</DxWindow>

@code {
    bool IsOpen { get; set; } = false;
    bool EulaAccepted { get; set; }

    void EulaClosing(WindowClosingEventArgs args) {
        if (args.CloseReason == WindowCloseReason.Programmatically) {
            args.Cancel = !EulaAccepted;
        }
    }
    void EulaClosed(WindowClosedEventArgs args) {
        EulaAccepted = false;
    }
}