Columns hide after button click.

Columns hide after button click.

Hi,
I have a code in which when i click button all my previous data removed automatically,

<script>
$(document).ready(function()
{
//$("tr:even").css("background-color","green");
////$("input:even").css("background-color","green");
////$("td:even").css("background-color","green");
//$("tr:odd").css("background-color","red");
$("#save").click(function ()
{
var i=1;
while(i<=29)
{
var val_s=$("#slno_"+i);
var val_a=$("#album_name_"+i);
var val_p=$("#paper_used_"+i);
var val_f=$("#finishing_"+i);
var val_pr=$("#price_"+i);
var val_v=$("#vat_"+i);
var val_t=$("#total_amt_"+i);
var data=val_s;
$("#result").append(data);
$("#result1").append(val_a);

i++;
}

});

});

</script>


<?php
require_once("config.php");
$query_for_result=mysqli_query($con,"SELECT * FROM mytable ORDER BY id ASC");
$num=mysqli_num_rows($query_for_result);
mysqli_close($con);

?>
<table >
<tr>
<td>Sl.No..</td>
    <td  >Item</td>
    <td  >Paper</td>
    <td  >Finish</td>
    <td  >Price</td>
    <td  >Vat</td>
    <td  >Total Amount</td>
   
  </tr>

<?php

$i=0;

while($row = mysqli_fetch_assoc($query_for_result)) 
{
$f1=$row['id'];
$f2=$row['album_name'];
$f3=$row['paper_used'];
$f4=$row['finishing'];
$f5=$row['price'];
$f6=$row['vat'];
$f7=$row['total_amt'];
 
$id=$i+1;
//echo $id;
?>
   <tr>
   <td><input id="<?php echo "slno_".$f1; ?>" name="slno" type="text" value="<?php echo $f1; ?>" style="width:20px;"/></td>
   <td><input id="<?php echo "album_name_".$f1; ?>" name="album_name" value="<?php echo $f2; ?>" type="text" style="width:150px;"/></td>
   <td><input id="<?php echo "paper_used_".$f1; ?>" name="paper_used" type="text" value="<?php echo $f3; ?>" style="width:85px;"/></td>
   <td><input id="<?php echo "finishing_".$f1; ?>" name="finishing"  value="<?php echo $f4; ?>" type="text" style="width:90px;"/></td>
   <td><input id="<?php echo "price_".$f1; ?>"  value="<?php echo $f5; ?>" name="price" type="text" style="width:25px;"/></td>
   <td><input id="<?php echo "vat_".$f1; ?>"  value="<?php echo $f6; ?>" name="vat" type="text" style="width:35px;"/></td>
   <td><input id="<?php echo "total_amt_".$f1; ?>" name="total_amt"  value="<?php echo $f7; ?>" type="text" style="width:50px;"/></td>
       
  </tr>
  <?php
$i++;

}

?>

I have check but unable to find the reason , can anyone of you help me for this.


thanks