*updated*   

I'm using while loop to display checkbox, the value of the checkbox is the amount. The codes can now display the total value when a checkbox is checked through the ajax function. During form submit, how do i obtain the $ID of checked value? As the name of the checkbox is not an array, i have no idea how to do that other way. Please help :'( Thanks in advance! 

PHP:

```
<table>
<form name="listForm">
<?php
while($row=mysql_fetch_assoc($result)){
$ID = $row['ID'];
$amount = $row['amount'];
?>
<tr>
<td><input type="checkbox" name="payID" data-payment-id="<?php echo $ID;?>" value="<?php echo $amount;?>" onclick="calculate();"></td>

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

```

javascript: 

```
function calculate(){
document.listForm.payID.value = '';
var sum = 0;
var count = 0;
for (i=0;i< document.listForm.payID.length ; i++) {
if (document.listForm.payID[i].checked) {
sum = sum + parseInt(document.listForm.payID[i].value);
count = count + 1;
}
}

document.getElementById('payable').innerHTML = "Total record chosen= "+ count +"<br>Total amount= " + sum + "<br>";
}

```