TreeList: Show ConfirmDialog during OnCreate

[Thomas]

Dear Community!

I have the requirement to show a ConfirmDialog before actually saving objects to the database, because of some conditions that need to meet. Nevertheless my TreeList looks like follows and has the later OnCreate event defined:

 <TelerikTreeList Data="@Data"
                  IdField="Server"
                  ParentIdField="PreServer"
                  Pageable="true"
 Height="100%"
 EditMode="@TreeListEditMode.Inline"
                  OnCreate="@CreateServer"
                  OnUpdate="@UpdateServer"
                  OnDelete="@DeleteServer"
                  OnEdit="@(() => EditAction = !EditAction)"
                  OnAdd="@(() => AddAction = !AddAction)"
                  ConfirmDelete="true">
</TelerikTreeList>

My approach was simply to hook into the OnCreate event, place a Dialogs.ConfirmAsync and await the result before continuing. In fact, the confirm dialog shows up, but gets overlayed by a transparent container that has a higher z-index and prevents the confirm dialog to be clicked. Furthermore a loading spinner appears and the app gets stuck. I also tried to add a Task.Delay(1) but it didn't work out.

    async Task CreateServer(TreeListCommandEventArgs args)
    {
        await Task.Delay(1);

        CancelCreate = await Dialogs.ConfirmAsync("Please confirm.", "Confirmation");

        if(CancelCreate){
        ServerViewModel server = (ServerViewModel)args.Item;

        if (server != null)
        {
            server.PreServer = ((ServerViewModel)args.ParentItem)?.Server;
            var result = await _sdService.CreateServer(server);

            if (result)
            {
                NotificationComponent?.Show("Server created!", NotificationTheme.Success);

                await FetchData();
            }
            else
            {
                NotificationComponent?.Show("An error occurred!", NotificationTheme.Error);
            }
        }
        }
    }

Any help would be much appreciated.
Many thanks!

[Nadezhda Tacheva]

Hi Thomas,

You may use the Class parameter of the TreeList to set a z-index style, which is lower than the default Dialog z-index of 10,000.

For more details on creating a custom confirmation dialog, you may refer to this article: Customize the Delete Confirmation Dialog. It targets the Grid and the delete command, but the same approach can be used for a different command and the TreeList component.

Regards,
Nadezhda Tacheva
Progress Telerik