Answers for "select change funtion"

click select option to update div jquery

$('#choose').change(function(event) {
        $.post('info.php', { selected: $('#choose').val() },
            function(data) {
                $('#update').html(data);
            }
        );            
    });

jquery on element change

// On element change.
$('mydiv').bind('DOMSubtreeModified', function () {
  console.log('changed');
});