A few jQuery helpers for working with HTML tables. Adding, removing rows and columns.

/*
  Remove the last/bottom table row
  http://jquery-howto.blogspot.com/2009/05/remove-bottom-table-row-using-jquery.html
*/

function removeTableRow(jQtable) {
  jQtable.each(function () {
    if ($('tbody', this).length > 0) {
      $('tbody tr:last', this).remove();
    } else {
      $('tr:last', this).remove();
    }
  });
}

// Here is how to use it
removeTableRow($('table'));

/*
    Remove n'th table column - jQuery plugin
    http://jquery-howto.blogspot.com/2009/05/remove-nth-table-column-jquery-plugin.html
*/

$.fn.removeCol = function (col) {
  // Make sure col has value
  if (!col) {
    col = 1;
  }
  $('tr td:nth-child(' + col + '), tr th:nth-child(' + col + ')', this).remove();
  return this;
};

/*
    Add a new table row to the bottom of the table
    http://jquery-howto.blogspot.com/2009/02/add-table-row-using-jquery-and.html
*/

function addTableRow(jQtable) {

  jQtable.each(function () {

    var $table = $(this);

    // Number of td's in the last table row
    var n = $('tr:last td', this).length;
    var tds = '<tr>';
    for (var i = 0; i < n; i++) {
      tds += '<td>&nbsp;</td>';
    }

    tds += '</tr>';
    if ($('tbody', this).length > 0) {
      $('tbody', this).append(tds);
    } else {
      $(this).append(tds);
    }
  });
}

addTableRow($('#myTable'));
addTableRow($('.myTables'));

/*
    Remove table row on user click
    http://jquery-howto.blogspot.com/2009/05/remove-table-row-on-user-click.html
*/

/*
  <table>
    <tr>
      <td>row 1, cell 1</td>
      <td><img class="delete" src="del.gif" /></td>
    </tr>
    <tr>
      <td>row 2, cell 1</td>
      <td><img class="delete" src="del.gif" /></td>
    </tr>
  </table>
*/

$('table td img.delete').click(function () {
  $(this).parent().parent().remove();
});

/*
  Dynamically adding table row count number using JavaScript and jQuery
  http://jquery-howto.blogspot.com/2009/01/dynamically-adding-table-row-count.html
*/

(function ($) {
  $.fn.extend({
    addCount: function () {
      return $(this).each(function () {
        if ($(this).is('table')) {
          $('thead th:first, thead td:first', this).each(function () {
            if ($(this).is('td')) {
              $(this).before('<td rowspan="' + $('thead tr').length + '">#</td>');
            } else if ($(this).is('th')) {
              $(this).before('<th rowspan="' + $('thead tr').length + '">#</th>');
            }
          });
          $('tbody td:first-child', this).each(function (i) {
            $(this).before('<td>' + (i + 1) + '</td>');
          });
        }
      });
    }
  });
})(jQuery);

// To apply it to your tables use this code:
$('table').addCount();
$('.some-table-class').addCount();
$('#some-table-id').addCount();