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add shipping to order total script?

P: n/a
I'm trying to modify this script...

<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

// 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 "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.lastIndex Of("_") + 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)
}

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>

....so that it will provide a shipping cost based on the order total it
calculates.

I tried this approach...

// Update the order total
if (item_quantity >= 0) {
order_total += item_quantity * item_price
}
if (order_total > 1) {
ship_cost = 1
}
}
}

// Display the total rounded to two decimal places
frm.TOTAL.value = round_decimals(order_total, 2)
frm.SHIPPING.value = ship_cost
}

....and it works, but throws an error.

Jan 21 '06 #1
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1 Reply


P: n/a
JRS: In article <11**********************@f14g2000cwb.googlegroups .com>
, dated Sat, 21 Jan 2006 09:41:15 remote, seen in
news:comp.lang.javascript, we*******@yahoo.com posted :
I'm trying to modify this script...

<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.*/


It's Copyright : you have permission to use it, but AFAICS not to
publish it (as you have done) or alter it.

Those considerations apart, it's not code that I would choose to use.

Those posting code to news should not allow their posting agent to wrap
it; that alienates potential readers.

Read the newsgroup FAQ.

--
John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 IE 4
<URL:http://www.jibbering.com/faq/> JL/RC: FAQ of news:comp.lang.javascript
<URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.
Jan 22 '06 #2

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