假設html結構
<table id='item-123'>
  <tr>
    <td>
      <select name='type'>
        <option value='1'>選項1</option>
        <option value='2'>選項2</option>
        <option value='3'>選項3</option>
      </select>
    </td>
  </tr>
</table>
javascript結構
$('table').delegate('select[name="type"]', 'change', function() {
   var id = $(this).parents('table').attr('id');
   console.log(id);
});