[back to Anatomy of a Domino e-commerce Web site (Part 3)]

The UpdateCart agent
Here is the code for the UpdateCart agent:

Sub Initialize

Dim s As New NotesSession, db As NotesDatabase
Dim doc As NotesDocument, oiDoc As NotesDocument

Set db = s.CurrentDatabase
Set doc = s.DocumentContext

Dim vCartID As Variant, vPath As Variant, vContent As Variant
Dim vDelete As Variant, vQuantity As Variant, vISBN As Variant, vSessionID As Variant
Dim emptyQuantity As Integer

'Establish the CartID

vCartID= Evaluate({@Middle(@LowerCase(HTTP_COOKIE) + ";";"cartid=";";")}, doc)
If vCartID(0) = "" Then
vCartID = Evaluate ({@Middle (@LowerCase(HTTP_Referer) + "&"; "&cartid="; "&")}, doc)
End If

'Explode Request_Content and then the individual fields within it

vContent = Evaluate({@Explode(Request_Content;"&")}, doc)
'If the customer has accidentally blanked out any quantities, vQunatity and vISBN will get out of
'sync when trimmed. Thus, for each blank QUANTITY value in vContent, we'll simply blank out
'its matching ISBN, which immediately follows the QUANTITY. This will keep us from updating the
'quantity on this particular Order Item doc, but the quantity is already stored there and will simply
'redisplay when the cart is refreshed.

Forall arg In vContent
If emptyQuantity Then
arg = "ISBN="
emptyQuantity = False
End If
If arg = "QUANTITY=" Then
emptyQuantity = True
End If
End Forall

doc.tmpContent = vContent
vDelete=Evaluate({@Trim(@Right(tmpContent;"DELETE="))},doc)
vQuantity=Evaluate({@Trim(@Right(tmpContent;"QUANTITY="))},doc)
vISBN=Evaluate({@Trim(@Right(tmpContent;"ISBN="))},doc)

'Update quantities for all Order Item documents for this customer

For x=0 To Ubound(vISBN)
Set oidoc = db.GetDocumentByUNID(vISBN(x))
If Not oidoc Is Nothing Then
If Cint(vQuantity(x))>0 Then
oidoc.Quantity = Cint(vQuantity(x))
Call oidoc.Save(True,True)
End If
End If
Next

'Delete an Order Item documents this customer has marked for delete

If Not vDelete(0) ="" Then
Forall v In vDelete
Set oidoc = db.GetDocumentByUNID(v)
If Not oidoc Is Nothing Then
Call oidoc.Remove(True)
End If
End Forall
End If

'Set URL path for return - in this case a simple redisplay of the cart
vPath=Evaluate({@ReplaceSubstring (@Subset (@DbName; -1); "\\" : " "; "/" : "+")})
Print "[" + vPath(0) + "/cart?ReadForm&CartID=" + vCartID(0) + "]"

End Sub