Solved

Adding values from a multiselect listbox?

Posted on 2006-06-16
5
515 Views
Last Modified: 2008-02-01
I’m doing a self study in Visual basic. I’m currently working on exercise 13.3.2 of ‘An Introduction to Programming using Visual Basic 6 by David I. Schneider’ with a few adjustments!!

The exercise is about a Fast Food Restaurant.

Here’s what I’ve done so far:

First I created a database in Access called FOCS, I have two tables called MenuItems & DrinkItems  –

MenuItems
--------------
ItemNo (PK)
Item (Text)
Price (Currency)

DrinkItems
--------------
DrinkNo (PK)
DrinkItem (Text)
DrinkPrice (Currency)

Next, I created a form in Visual Basic 6. I have two ADODC controls with connections to FOCS; ADOCMenu & ADOCDrinks.

I placed two DataList boxes onto the form; DataList1 & DataList2

DataList1 source is ADOCMenu & DataList2 source is ADOCDrinks.

Ok, this work perfectly fine. I can display my Food & Drinks Items in DataList1 & DataList2.

Next I created a listbox (lstOrder) for my orders and cmdButtons (button >>> & button <<<)

I want to multi-select items from DataList1 & DataList2 and display these items in lsdOrder – the code I’ve used is:

Private Sub cmdMoveItem_Click()

adoMenu.Recordset.MoveFirst

Do While adoMenu.Recordset.Fields("Items") <> DataList1.Text
adoMenu.Recordset.MoveNext
Loop

lstOrder.AddItem adoMenu.Recordset.Fields("Items") & " " & FormatCurrency(adoMenu.Recordset.Fields("Price"))

End Sub

Ok, so far, all is well. I can multi-select Food & Drink items, click >>> or <<< Button’s and the items and price are then displayed in lstOrder box.

The next pit is where I’m stuck…….I’m tying to create a Total Cost (txtTotalCost) of all the items and price displayed in lstOrder……….can any help??
0
Comment
Question by:irwells
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 23

Accepted Solution

by:
basicinstinct earned 168 total points
ID: 16924457
good book - i learned to program from that book

what you need to do is write a loop to go throgh all of the items in lstOrder and add each price to a variable, a bit like this:

Private Sub AddOrder()
    Dim i, iTotal As Integer
    For i = 0 To lstOrder.ListCount - 1
        iTotal = iTotal + lstOrder.List(i)
    Next
    MsgBox iTotal
End Sub
0
 
LVL 20

Assisted Solution

by:alainbryden
alainbryden earned 166 total points
ID: 16925438
you could even add another label to the form that displays the running total. Turn his sub into a function

Private Function AddOrder() As Integer
...
...
...
     AddOrder = iTotal
End Function

you can have the following.

Private Sub lstOrder_Change() 'This will execute every time it's changed
    lblTotal = AddOrder
    refresh lblTotal
End Sub

since the AddOrder function does not take long to execute, it will be a neat feature and you can watch the total add up in real time as it's being entered. Then when you want to store it just say

..... .Total = val(lblTotal)

And it's yours for the taking


Have fun!

Alain
0
 
LVL 6

Assisted Solution

by:AHMKC1
AHMKC1 earned 166 total points
ID: 16951226
You call following function at your cmdMoveItem_Click


Private Function CalculatePrice()
   
    Dim Rs As Recordset, I, TotalPrice As Integer
   
    For I = 0 To lstOrder.ListCount - 1
    Set Rs = New Recordset
    Rs.open "Select Price  From MenuItems Where Item  & ' ' & Price='" & lstOrder.List(I) & "'", Cnn, OpenStatic
    '******* Cnn is connection string
    If Rs.Recordcount <> 0 Then
        TotalPrice = TotalPrice + Rs!Price
    Else
        Set Rs = Nothing
        Set Rs = New Recordset
        Rs.open "Select DrinkPrice  From MenuItems Where Item  & ' ' & DrinkPrice='" & lstOrder.List(I) & "'", Cnn, OpenStatic
        If Rs.Recordcount <> 0 Then
            TotalPrice = TotalPrice + Rs!DrinkPrice
        End If

    End If
        Set Rs = Nothing
    Next
   
   
   txtTotalCost.Text = TotalPrice


End Function


thanks
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Does the idea of dealing with bits scare or confuse you? Does it seem like a waste of time in an age where we all have terabytes of storage? If so, you're missing out on one of the core tools in every professional programmer's toolbox. Learn how to …
In this post we will learn different types of Android Layout and some basics of an Android App.
In this fourth video of the Xpdf series, we discuss and demonstrate the PDFinfo utility, which retrieves the contents of a PDF's Info Dictionary, as well as some other information, including the page count. We show how to isolate the page count in a…
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question