Выборка элемента через jquery

$("button.add").click(add_data_mod); 
 
function add_data_mod(e) { 
  var $cell = $(this).closest("td"); 
  var $inp = $cell.find(".datas_mod"); 
  var dataIn = { 
    dmodule: $inp.val(), 
    datanum: $inp.data("num") 
  }; 
  console.log(dataIn); 
 
  $.post("../api/datamodadd", dataIn, function(dataOut) { 
    $cell.find("span.result").text(dataOut); 
  }); 
 
  $inp.val(''); 
  return false; 
} 
 
function keypressed(e) { 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<table border="1"> 
  <tr> 
    <td> 
      <span class="result">None</span> 
      <br/> 
      <input type="text" data-num="1" name="datas_mod" class="datas_mod" onkeypress="keypressed(event)" style="width: 40%"> 
      <button type="submit" class="add">Add</button> 
      <button type="submit" class="del">Del</button> 
      <br/> 
    </td> 
  </tr> 
</table>