Use NavigationLock on EditServer page to prevent user from navigating away before confirmation.

ServerManagement/Components/Pages/EditServer.razor

@@ -1,9 +1,17 @@
 @page "/servers/{id:int}"
 @* Route constraints: https://learn.microsoft.com/en-us/aspnet/core/fundamentals/routing?view=aspnetcore-9.0#route-constraints *@
 
-@attribute [ExcludeFromInteractiveRouting]
+@* Note that this attribute now needs to be removed, because Routing is globally interactive.
+The navigation manager only will respond correctly if all its behaviours are the same. *@
+@* @attribute [ExcludeFromInteractiveRouting] *@
 
 @inject NavigationManager NavigationManager
+@inject IJSRuntime JSRuntime
+
+<NavigationLock
+  OnBeforeInternalNavigation="OnBeforeInternalNavigation"
+  ConfirmExternalNavigation="true">
+  </NavigationLock>
 
 <h3>Edit server</h3>
 <br/>
@@ -68,4 +76,13 @@
     // An exception is raised when debugging from VS Code, but not when using dotnet watch.
     NavigationManager.NavigateTo("/servers");
   }
+
+  private async Task OnBeforeInternalNavigation(LocationChangingContext context)
+  {
+    var isConfirmed = await JSRuntime.InvokeAsync<bool>("confirm", "Are you sure you want to leave this page?");
+    if (!isConfirmed)
+    {
+      context.PreventNavigation();
+    }
+  }
 }