<% ' ***** Begin the functions to be called by the runtime script ***** ' To find the actual runtime code scroll WAY DOWN.... ' This function is written to enable the adding of multiples of an item ' but this sample always just adds one. If you wish to add different ' quantities simply replace the value of the Querystring parameter count. ' We didn't do this because we wanted to keep the whole thing simple and ' not get into using forms so it stayed relatively readable. Sub AddItemToCart(iItemID, iItemCount) If dictCart.Exists(iItemID) Then dictCart(iItemID) = dictCart(iItemID) + iItemCount Else dictCart.Add iItemID, iItemCount End If Response.Write iItemCount & " of item # " & iItemID & " have been added to your cart.

" & vbCrLf End Sub Sub RemoveItemFromCart(iItemID, iItemCount) If dictCart.Exists(iItemID) Then If dictCart(iItemID) <= iItemCount Then dictCart.Remove iItemID Else dictCart(iItemID) = dictCart(iItemID) - iItemCount End If Response.Write iItemCount & " of item # " & iItemID & " have been removed from your cart.

" & vbCrLf Else Response.Write "Couldn't find any of that item your cart.

" & vbCrLf End If End Sub Sub ShowItemsInCart() Dim Key Dim aParameters ' as Variant (Array) Dim sTotal, sShipping %> <% sTotal = 0 For Each Key in dictCart aParameters = GetItemParameters(Key) %> <% sTotal = sTotal + (dictCart(Key) * CSng(aParameters(2))) Next 'Calculate shipping - you might want to pull this out into a function if your shipping ' calculations are more complicated then ours. ;) If sTotal <> 0 Then sShipping = 7.5 Else sShipping = 0 End If sTotal = sTotal + sShipping %>
Item # Description Quantity Remove Item From Cart Price Totals
<%= Key %> <%= aParameters(1) %> <%= dictCart(Key) %> Remove One  Remove All $<%= aParameters(2) %> $<%= FormatNumber(dictCart(Key) * CSng(aParameters(2)),2) %>
S+H:$<%= FormatNumber(sShipping,2) %>
Total:$<%= FormatNumber(sTotal,2) %>
<% End Sub Sub ShowFullCatalog() Dim aParameters ' as Variant (Array) Dim I Dim iItemCount ' Number of items we sell ' If you are really going to use this sample this should probably be pulled from a DB iItemCount = 3 %> <% For I = 1 to iItemCount aParameters = GetItemParameters(I) %> <% Next 'I %>
Image Description Price Add Item To Cart
<%= aParameters(1) %> $<%= aParameters(2) %> Add this to my cart!
<% End Sub Sub PlaceOrder() Dim Key Dim aParameters ' as Variant (Array) Dim sTotal, sShipping %> <% sTotal = 0 For Each Key in dictCart aParameters = GetItemParameters(Key) %> <% sTotal = sTotal + (dictCart(Key) * CSng(aParameters(2))) Next 'Calculate shipping - you might want to pull this out into a function if your shipping ' calculations are more complicated then ours. ;) If sTotal <> 0 Then sShipping = 7.5 Else sShipping = 0 End If sTotal = sTotal + sShipping %>
Item # Description Quantity Price Totals
<%= Key %> <%= aParameters(1) %> <%= dictCart(Key) %> $<%= aParameters(2) %> $<%= FormatNumber(dictCart(Key) * CSng(aParameters(2)),2) %>
S+H:$<%= FormatNumber(sShipping,2) %>
Total:$<%= FormatNumber(sTotal,2) %>
<% End Sub ' We implemented this this way so if you attach it to a database you'd only need one call per item Function GetItemParameters(iItemID) Dim aParameters ' Will contain 3 string values : image path, description, price ' However we need to keep price so it can be converted to a ' single for computation hence no currency symbol. This array ' can also be expanded to contain any other information about the ' product that you might want to pull from the DB. Select Case iItemID Case 1 aParameters = Array("./images/shop_shirt.gif", "ASP 101 T-Shirt", "15.00") Case 2 aParameters = Array("./images/shop_kite.gif", "ASP 101 Kite", "17.50") Case 3 aParameters = Array("./images/shop_watch.gif", "ASP 101 Watch", "35.00") Case 4 ' Not in use because we couldn't draw a pen in a few seconds! aParameters = Array("./images/shop_pen.gif", "ASP 101 Pen", "5.00") End Select ' Return array containing product info. GetItemParameters = aParameters End Function %> <% ' ***** Begin the infamous runtime script ***** ' Declare our Vars Dim dictCart ' as dictionary Dim sAction ' as string Dim iItemID ' as integer Dim iItemCount ' as integer ' Get a reference to the cart if it exists otherwise create it If IsObject(Session("cart")) Then Set dictCart = Session("cart") Else ' We use a dictionary so we can name our keys to correspond to our ' item numbers and then use their value to hold the quantity. An ' array would also work, but would be a little more complex and ' probably not as easy for readers to follow. Set dictCart = Server.CreateObject("Scripting.Dictionary") End If ' Get all the parameters passed to the script sAction = CStr(Request.QueryString("action")) iItemID = CInt(Request.QueryString("item")) iItemCount = CInt(Request.QueryString("count")) %>
<% ' Select action based on user input Select Case sAction Case "add" AddItemToCart iItemID, iItemCount ShowItemsInCart %>
Continue Looking Checkout
<% Case "del" RemoveItemFromCart iItemID, iItemCount ShowItemsInCart %>
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<% Case "viewcart" ShowItemsInCart %>
Continue Looking Checkout
<% Case "checkout" PlaceOrder %>

Thank you for your order!

If this had been an actual shopping cart, this is where you would have had them enter their personal information and payment method and then taken care of any backend processing before finalizing their order. However as this is a shopping cart sample and this is where security becomes a problem, we'll leave it for a future sample. <% Case Else ' Shop ShowFullCatalog %>
View Cart Contents <% End Select ' Return cart to Session for storage Set Session("cart") = dictCart %>
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