Question

Having some trouble figuring this one out. If both the checkbox in the second and third td is unchecked, then disable the one in the fourth.

$('#allergies tbody tr').each(function () {
  if ($('td:eq(1) input[type="checkbox"]:not(:checked)', $(this)).length > 0 
      && $('td:eq(2) input[type="checkbox"]:not(:checked)', $(this)).length > 0) {
      $("td:eq(3) input", $(this)).attr('disabled', false);
  }
});

Answer 1

$('#allergies tbody tr').each(function () {
  if ($('td:eq(1) input[type="checkbox"]:not(:checked)').length > 0 
      && $('td:eq(2) input[type="checkbox"]:not(:checked)').length > 0) {
      $("td:eq(3) input").prop('disabled', true);
  }
});

to the specific ones in the tr use

$('#allergies tbody tr').each(function () {
  if ($('td:eq(1) input[type="checkbox"]:not(:checked)', $(this)).length > 0 
      && $('td:eq(2) input[type="checkbox"]:not(:checked)', $(this)).length > 0) {
      $("td:eq(3) input", $(this)).prop('disabled', true);
  }
});