Ajax binding and AddModelError

[Greg Lynne]

Hi Telerik,

I was hoping that you might be able to confirm that the following should work or not on the initial binding?

Should the OnError event get thrown when you apply ModelState.AddModelError during the initial bind of the grid via ajax, or do I need to set Response.StatusCode = 500 everytime to create the error but this will not create a modelstateerror

I am using version 2012.1.214

Please see the follwing code below:

VIEW

@{
    Html.Telerik().Grid<TaskDto>()
        .Name("Tasks")
        .ClientEvents(events => { events.OnError("Grid_onError"); }
        )
        .Columns(columns =>
        {
            columns.Bound(o => o.Title).Title("Title");
        })
        .Sortable()
        .DataBinding(
            dataBinding => dataBinding.Ajax()
            .Select("_Tasks", "Task")
        )
        .EnableCustomBinding(true)
        .Render();
}

Javascript Handler

function Grid_onError(args) {
    alert(args.textStatus);

    if (args.textStatus == "modelstateerror" && args.modelState) {

        var message = "Errors:\n";
        $.each(args.modelState, function (key, value) {
            if ('errors' in value) {
                $.each(value.errors, function () {
                    message += this + "\n";
                });
            }
        });

        args.preventDefault();
        alert(message);
    }
}

Controller

          [HttpPost]
        [GridAction(EnableCustomBinding = true)]
        public ActionResult _Tasks(GridCommand command)
        {
               try
               {
                   return View(new GridModel<TaskDto>() { Data = _proxy.CurrentTasks() });
               }
               catch(Exception exception)
               {
                  // Response.StatusCode = 500;

                   ModelState.AddModelError("Error", "Proxy error.");
                   return View(new GridModel<TaskDto>() { Data = new List<TaskDto>() {  } });

               }
           }
        }

[Greg Lynne]

Or as an alternative to setting the Response.StatusCode = 500; should I subscripe to the OnComplete event as mentioned in the following thread http://www.telerik.com/community/forums/aspnet-mvc/grid/handle-ajax-delete-error.aspx

PS: I did look really hard through your forum to find an answer for this but was unsure of the correct approach.