Hello,

I have a custom order form that will add up and show the total but I’m having trouble getting it to subtract the discount. What changes do I need to make to my javascript?

The form is here:

http://www.houston-reviews.com/purchase/order.php

This is the javascript I’m using which is also viewable in the source code of the above form:

```
<script language="JavaScript" type="text/javascript">
<!--
/* This script is Copyright (c) Paul McFedries and
Logophilia Limited (http://www.mcfedries.com/).
Permission is granted to use this script as long as
this Copyright notice remains in place.*/
function CalculateTotal(frm) {
var order_total = 0
// var order_disc = 0
// Run through all the form fields
for (var i=0; i < frm.elements.length; ++i) {
// Get the current field
form_field = frm.elements[i]
// Get the field's name
form_name = form_field.name
/*
// Is it a "discount" field?
if (form_name.substring(0,4) == "DISC") {
// If so, extract the price from the name
item_price2 = parseFloat(form_name.substring(form_name.lastIndexOf("_") + 1))
// Get the quantity
item_quantity2 = parseInt(form_field.value)
// Update the order total
if (item_quantity2 >= 0) {
var order_disc
order_disc += item_quantity2 * item_price2
//alert(order_disc)
}
}
*/
// Is it a "product" field?
if (form_name.substring(0,4) == "PROD") {
// If so, extract the price from the name
item_price = parseFloat(form_name.substring(form_name.lastIndexOf("_") + 1))
// Get the quantity
item_quantity = parseInt(form_field.value)
// Update the order total
if (item_quantity >= 0) {
order_total += item_quantity * item_price
}
}
}
// Display the total rounded to two decimal places
frm.TOTAL.value = round_decimals(order_total, 2)
frm.amount.value = round_decimals(order_total, 2)
}
function round_decimals(original_number, decimals) {
var result1 = original_number * Math.pow(10, decimals)
var result2 = Math.round(result1)
var result3 = result2 / Math.pow(10, decimals)
return pad_with_zeros(result3, decimals)
}
function pad_with_zeros(rounded_value, decimal_places) {
// Convert the number to a string
var value_string = rounded_value.toString()
// Locate the decimal point
var decimal_location = value_string.indexOf(".")
// Is there a decimal point?
if (decimal_location == -1) {
// If no, then all decimal places will be padded with 0s
decimal_part_length = 0
// If decimal_places is greater than zero, tack on a decimal point
value_string += decimal_places > 0 ? "." : ""
}
else {
// If yes, then only the extra decimal places will be padded with 0s
decimal_part_length = value_string.length - decimal_location - 1
}
// Calculate the number of decimal places that need to be padded with 0s
var pad_total = decimal_places - decimal_part_length
if (pad_total > 0) {
// Pad the string with 0s
for (var counter = 1; counter <= pad_total; counter++)
value_string += "0"
}
return value_string
}
//-->
</script>
```

Thanks in advance!

Tim