[Solved] onComboBoxDataBound(e) view Combobox data

[John]

Hello

Hoping you can help please.

I have a one ComboBox that when selected cascades another combobox which loads it's elements via an AJAX call.
I.e.

<tr>
                        <td>@Html.LabelFor(model => model.CompanyId)</td>
                        <td>@(Html.Telerik().ComboBoxFor(model => model.CompanyId)
                            .BindTo(new SelectList(Lookup.ActiveExternalCompanies(), "Id", "Name"))
                            .Enable(true)
                            .Placeholder("-- Select One --")
                            .CascadeTo("RequestorId"))</td>
                        <td>@Html.ValidationMessageFor(model => model.CompanyId)</td>
                    </tr>
                    <tr>
                        <td>@Html.LabelFor(model => model.RequestorId)</td>
                        <td>@(Html.Telerik().ComboBoxFor(model => model.RequestorId)
                            .DataBinding(binding => binding.Ajax().Select("_CompanyUsers", "Quote"))
                            .ClientEvents(events => events
                                  .OnDataBound("onComboBoxDataBound")
                            )
                            .Placeholder("-- Select One --")
                            .Value("")
                            .CascadeTo("RfqTypeId"))</td>
                        <td>@Html.ValidationMessageFor(model => model.RequestorId)</td>
                    </tr>

I.e. when a selection is made in the first combobox the other makes an AJAX call to retrieve the data.
Everything works perfect, however,
The second combobox remains disabled if no data is returned from the AJAX call.
I would like to inform the user of this because the current situation is not intuitive, it looks like the UI has frozen.

A) Is there a way to alert the user of this when it happens using Telerik syntax?
or (alternatively)
B) in my javascript handler,  'e' is passed in the the function (e.data is always null by the way). Can I count the elements returned or even access the JSON object returned? I don't know what e is as such.

function onComboBoxDataBound(e) {
     //what can 'e' tell me?
 }

Any comments welcome.....

Thanks very much
J

[John]

I found the solution to be:

function onComboBoxDataBound(e) {
     var elementCount = $(this).data("tComboBox").dropDown.$element.find("ul").find('li').size();
      if (elementCount == 0) {
          //This combobox has no elements
      }
 }

I've detailed the entire thing here for anyone who comes against the same problem.

http://outbottle.com/telerik-asp-net-mvc-count-the-number-of-elements-in-a-combobox-dropdownlist-or-autocomplete-ui-component/ 

Thanks