<script type='text/javascript'>

        $('#dryer').keyup(function(){alert($(this).val())});

        </script>
        <?php
        echo "<tr>";
            echo "<td>Dryer</td>";
            echo "<td>";
                echo form_input(array('name'=>'dryer','id'=>'dryer'));
            echo " Buah</td>";
        echo "</tr>";
?>