Session Help...PLEASE!

Question

I have a "Shopping Cart" that i got from a tutorial. I made
it work for our application but i found a problem. If i add a
product to the cart with a product name of 12345 it will add this
product fine. If i add another product with the same product name
of 12345 it will not add it to the cart and only keep the first
product name added of 12345. Basically the same product name cannot
be added to the cart, every product name has to be unique for it to
be added to the cart, we would like the unique data to be the
receiptNo and not the productName but we cannot figure out how to
do this. Please any help would be great. Thanks a lot! heres the
code to the crtAdd.cfm page:
<!--- This script adds a product to the cart or updates
the quantity if the product is already in the cart--->
<!--- Create Session Variables if they are not already
defined--->
<cfset WasQUpdated = 'No'>
<cfif NOT isdefined('session.CrtProductName')>
<cfset session.CrtProductID="">
<cfset session.CrtreceiptNo="">
<cfset session.CrtProductName = "">
<cfset session.CrttaxYear="">
<cfset session.CrtQuantity = "">
<cfset session.CrtPrice = "">
</cfif>
<cfif isdefined('session.CrtProductName')>
<cfif session.CrtProductName IS "">
<cfset session.CrtProductID="">
<cfset session.CrtreceiptNo="">
<cfset session.CrtProductName = "">
<cfset session.CrttaxYear="">
<cfset session.CrtQuantity = "">
<cfset session.CrtPrice = "">
</cfif>
</cfif>
<!--- Now Look in the cart and see if there are any
duplicate items. If so, then
update the product quantities--->
<cfoutput>
<cfif ISDEFINED ('form.quantity')>
<cfif #form.Quantity# IS ''>
<cfset TheQuantity = '1'>
</cfif>
<cfif NOT #form.Quantity# IS ''>
<cfset TheQuantity = '#form.quantity#'>
</cfif>
</cfif>
<cfif NOT #ListLen(session.CrtProductName, "^")# IS 0>
<cfloop index="LoopCount" FROM="1"
TO="#ListLen(session.CrtProductID, "^")#">
<CFIF #ListGetAt(session.CrtProductName, loopcount, "^")#
IS #form.ProductName#>
<CFSET NewQuantity = #ListGetAt(session.CrtQuantity,
LoopCount, "^")# + #TheQuantity#>
<CFSET SetQauntity = ListSetAt(session.CrtQuantity,
LoopCount, #NewQuantity#, "^")>
<CFSET session.CrtQuantity = #SetQauntity#>
<CFSET WasQUpdated = 'Yes'>
</CFIF>
</cfloop>
</cfif>
</cfoutput>
<cfif #WasQUpdated# IS 'Yes'>
<CFLOCATION URL="paycart.cfm?Action=View">
</cfif>
<cfoutput>
<CFSET NewProdID = ListAppend(#session.CrtProductID#,
#form.ProductID#, "^")>
<CFSET Session.CrtProductID = #NewProdID#>
<CFSET NewreceiptNo = ListAppend(#session.CrtreceiptNo#,
#form.receiptNo#, "^")>
<CFSET Session.CrtreceiptNo = #NewreceiptNo#>
<CFSET NewProductName =
ListAppend(#session.CrtProductName#, #form.ProductName#, "^")>
<CFSET Session.CrtProductName = #NewProductName#>
<CFSET NewtaxYear = ListAppend(#session.CrttaxYear#,
#form.taxYear#, "^")>
<CFSET Session.CrttaxYear = #NewtaxYear#>
<CFSET NewQuantity = ListAppend(#session.CrtQuantity#,
#TheQuantity#, "^")>
<CFSET Session.CrtQuantity = #NewQuantity#>
<CFSET NewPrice = ListAppend(#session.CrtPrice#,
#form.Price#, "^")>
<CFSET Session.CrtPrice = #NewPrice#>
</cfoutput>
<CFLOCATION URL="paycart.cfm?action=View">

Answer 1

> Basically the same product name cannot be added to the
cart, every
> product name has to be unique for it to be added to the
cart, we would
> like the unique data to be the receiptNo and not the
productName but
> we cannot figure out how to do this.
Make the add-to-cart process a function called, perhaps,
addToCart(). Use precisely the logic that works for
productName, but let your function add
receiptNo instead.