想在yii框架中传递javascript中的参数值

In Yii framework using html elements for displaying contents. In that want to pass the ($i) values on the onchange method and calculation done in script. Only the first value is coming always on onchange method. Want to get current value of ($i) which is looping in foreach loop.

<?php $i=0; foreach($sub_marks as $sub) { $i++?>

  <td>
    <?= Html::textInput('reg_cia'.$i,"",['id'=>'reg_cia','style'=>'width:40px']); ?>
  </td>
  <td>

    // Here the onchange method only first value is passing always 
    <?= Html::textInput('reg_ese'.$i,$i,['id'=>'reg_ese','tabindex'=>'1','style'=>'width:40px','onchange'=>'js:alerts()'])?>\

  </td>
  <td>
    <?= Html::textInput('reg_total'.$i,"",['id'=>'reg_total','style'=>'width:40px']); ?>
  </td>

  </tr>
<?php } ?>
<?php } ?>
</table>

<script>
  function alerts()
  {
    var a="reg_cia";
    var b="reg_ese";
    var s=document.getElementById(a).value;
    var g=document.getElementById(b).value;
    alert(s+g);
  }
  </script>