Get selected value of a dropdown without ID

As the headline is short, the work is simple. Look at the following code

$('select').on('change', function () {         
            var ttMailActorTo = $('option:selected', this).attr('ttMailActorTo');
            if (isEmail(ttMailActorTo))
                $('#ttMailActorTo').val(ttMailActorTo);
});

It binds the change function to all select on the page and get the special attribute value "ttMailActorTo" and append it to a hidden field "ttMailActorTo".

Simple as that. Enjoy.