javascript - Jquery - Get previous value row in table -

i have dynamic simple table like:

i try previous value cell when click edit button.

example: when click first edit button alert('a1')
when click second edit button alert('a2')

i try

$('.edit').click(function(){         alert($(this).parents('tr').prev().children().eq(1).text()); }); 

it's working first edit button because previous row has 1 row.
, it't not working second edit button.

how can (by dynamic previous row) http://jsfiddle.net/bwjbj/

ps: i'm working next row

alert($(this).parents('tr').nextall(':eq(' + ($(this).parent().siblings().eq(0).attr("rowspan")-1) + ')').children().eq(1).text()); 

http://jsfiddle.net/mblase75/xgdkd/

the problem second edit button, previous table row isn't row want -- want row 2 more before that, because that's rowspans begin.

or, general: want the table row belonging previous edit button. in case of first edit button, though, want previous row.

so, in code:

$('.edit').click(function () {     var idx = $('.edit').index(this); // edit button this?     if (idx > 0) { // first button         var $tr = $('.edit').eq(idx-1).closest('tr'); // previous row     } else { // not first button         var $tr = $(this).closest('tr').prev('tr'); // previous edit button's row     }     var $td = $tr.find('td:nth-child(2)'); // second <td> of row     alert($td.text()); }); 

compact version of same code:

$('.edit').click(function () {     var idx = $('.edit').index(this),         $tr = (idx) ? $('.edit').eq(idx-1).closest('tr') : $(this).closest('tr').prev('tr'),         $td = $tr.find('td:nth-child(2)');     alert($td.text()); });