> Although I escaped the brackets, my alert is still displaying
> "Undefined" for the value of radio buttons:
> alert($('input:radio[name=field_submcategory\\[value\\]]:checked').val
> ());
>
> could it be something else?
I don't think you have that selector right.
$('input[name=field_submcategory\\[value\\]]:radio:checked').val();
but the :radio bit is probably redundant, so maybe just this:
$('input[name=field_submcategory\\[value\\]]:checked').val();
If neither of those work then experiment by using the Firebug console
to type in the selector.
