jquery - Prevent duplication of first drop down option for each row -

i want prevent duplication of first drop down option each row. tried code below. not worked.

$('table tr').each(function(){  $('select:eq(0)').change(function(){     if($('option[value='+$(this).val()+']:selected').length>1)      {        alert('option selected');        $(this).val($(this).find("option:first").val());         }   });   });  

here want alert message when category drop down each row.

fiddle: http://jsfiddle.net/y00h1j5x/1/

update code follow:

    $(document).ready(function () {         var row="<tr>"+            ' <tr>'+                '<th>category</th>'+                '<th>item1</th>'+                '<th>item2</th>'+            '</tr>';         $("#table").append(row)         $("#button").click(             function () {                 addrow();             }                     );     });          function addrow()     {            var row='<tr>'+                '<td><select>'+                         '<option>--select--</option>'+                         '<option value="1">fruits</option>'+                          '<option value="2">vegi</option>'+                          '<option value="3">flowers</option>'+         '</select></td>'+         '<td><select>'+                         '<option>--select--</option>'+                         '<option value="1">item1</option>'+                          '<option value="2">item2</option>'+                          '<option value="3">item3</option>'+        '</select></td>'+         '<td><select>'+                          '<option>--select--</option>'+                         '<option value="1">item1</option>'+                          '<option value="2">item2</option>'+                          '<option value="3">item3</option>'+        '</select></td></tr>';         row = $(row);         row.find("select:eq(0)").change(function(){        if($('option[value='+$(this).val()+']:selected').length>1){          alert('option selected');          $(this).val($(this).find("option:first").val());           }          });     $("#table").append(row);     } 

http://jsfiddle.net/y00h1j5x/4/

add event element new not previous elements.