Question

Problem getting the highest value from a session variable.

Asked by: gordysane

I have created a shopping cart which previously just added all the product postage costs together but the client now wants customers to only be charged the highest postage cost. I don't know how to get it to select the highest number though, the code I have is:


<%
  FOR i = 0 TO UBOUND( localCart, 2 )
  IF localCart( CARTPID, i ) <> "" THEN
  subTotal = subTotal + ( localCart( CARTPPRICE, i ) * localCart( CARTPQUANTITY, i ) )
  postage = ( localCart( CARTPDELIVERY, i ))
  vat = ( ( (subTotal + postage ) * 17.5 )/100 )
  orderTotal = subTotal + postage + vat
  %>
  <tr>
    <td style="border-bottom: 1px solid #666666;"><%=Server.HTMLEncode( localCart( CARTPCODE, i ) )%></td>
    <td style="border-bottom: 1px solid #666666;"><%=Server.HTMLEncode( localCart( CARTPNAME, i ) )%><br />
        <% IF Server.HTMLEncode( localCart( CARTPCOLOUR, i ) ) <> "" THEN %>
        <em><%=Server.HTMLEncode( localCart( CARTPCOLOUR, i ) )%></em>
        <% END IF %>      
    </td style="border-bottom: 1px solid #666666;">
    <td style="border-bottom: 1px solid #666666;"><%=formatCurrency( localCart( CARTPPRICE, i ) )%></td>
    <td style="border-bottom: 1px solid #666666;"><input name="pq<%=localCart( CARTPID, i )%>" type="text" size="4" value="<%=localCart( CARTPQUANTITY, i )%>" /></td>
    <td style="border-bottom: 1px solid #666666;"><input name="pd<%=localCart( CARTPID, i )%>" type="checkbox" value="1" /></td>
  </tr>
  <%
  END IF
  NEXT
  %>

localCart is my session variable and CARTPDELIVERY is my postage cost.
Any help with this specifically or how to make an array of values from a session variable and then select the highest one would be much appreciated.

Many thanks.

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Asked On
2007-10-05 at 04:09:39ID22874426
Tags

highest

,

how

,

many

,

value

,

variables

Topics

Active Server Pages (ASP)

,

E-Commerce

Participating Experts
2
Points
250
Comments
7

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Answers

 

by: topazgPosted on 2007-10-05 at 04:36:00ID: 20020953

I'm going to guess here that CARTPDELIVERY is already a decimal number holding the "added together" postage costs - presumably stored as a single piece of data in a basket table? If so, how are these added into the database in the first place?

From what I can read, that code appears designed to output the contents of the basket, including delivery costs for each time, and display to the page.

I can't see any "summary" or "totalling" lines here?

 

by: gordysanePosted on 2007-10-05 at 05:07:31ID: 20021105

No, CARTPDELIVERY is the postage cost for each product in the session variable, the IF loop goes through each product added and outputs the details into the table.

The totalling lines are at the start of the code block I put up:
<%
  FOR i = 0 TO UBOUND( localCart, 2 )
  IF localCart( CARTPID, i ) <> "" THEN
  subTotal = subTotal + ( localCart( CARTPPRICE, i ) * localCart( CARTPQUANTITY, i ) )
  postage = ( localCart( CARTPDELIVERY, i ))
  vat = ( ( (subTotal + postage ) * 17.5 )/100 )
  orderTotal = subTotal + postage + vat
  %>

the "postage =" is the one I need to return the highest postage value.
At present it only outputs the postage value for the last product added.

Hope this helps.

 

by: savithaPosted on 2007-10-05 at 05:28:32ID: 20021241

MaxPostage = 0
 
FOR i = 0 TO UBOUND( localCart, 2 )
  IF localCart( CARTPID, i ) <> "" THEN
subTotal = subTotal + ( localCart( CARTPPRICE, i ) * localCart( CARTPQUANTITY, i ) )
      postage = (localCart( CARTPDELIVERY, i ))
      IF postage > MaxPostage then
            MaxPostage = postage
      End if
      

 

by: savithaPosted on 2007-10-05 at 05:29:25ID: 20021246

In the above code the variable "MaxPostage " will have the maximum postage value. check if it works

 

by: topazgPosted on 2007-10-05 at 05:35:54ID: 20021289

The problem as I see it is that:

orderTotal = subTotal + postage + vat

is appending the postage for each item as it goes by, and the vat is also calculated based on a postage increased value. In reality, this is going to add a whole bunch of things knocking the price out. Try doing:

<%
  ' Declare maxPostage somewhere if you have option = explicit
  FOR i = 0 TO UBOUND( localCart, 2 )
  IF localCart( CARTPID, i ) <> "" THEN
  subTotal = subTotal + ( localCart( CARTPPRICE, i ) * localCart( CARTPQUANTITY, i ) )
  if ( localCart( CARTPDELIVERY, i )) > postage then
    postage = ( localCart( CARTPDELIVERY, i ))
  end if
  vat = ( ( subTotal * 17.5 )/100 )
  orderTotal = subTotal + vat
  %>

and further down:

<%
  END IF
  NEXT
  postageVat = ( ( postage * 17.5 )/100 )
  orderTotal = orderTotal + postage + postageVat
  %>

This should work...

 

by: topazgPosted on 2007-10-05 at 05:36:54ID: 20021298

sorry, the comment should reference "postage" instead of "maxPostage" -- the second variable shouldn't be necessary so I took it out of the if clause.

 

by: gordysanePosted on 2007-10-05 at 05:41:12ID: 20021318

Thanks for the help guys, think both would work but got it working now.
Excellent work.

20120131-EE-VQP-002

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