genexus

How to sum (totalize) a variable in grid using for each?

UI'm new in genexus and I'm trying to make a simple sales system. I'm trying to totalize a variable using a For Each line in Grid

Here's my screen:

SaleScreen

1

My SubTotal works but Total stay one step behind

And here's my code:

Event GridProduct.Load
 For Each Product
  &ProductPicture= ProductPicture
  &ProductPrice = ProductPrice
  GridProduct.Load()
 EndFor
Endevent

Event 'BtnPlus'
 &ProductQty= &ProductQty + 1
 Do 'SubTotal'
 Do 'Total'
EndEvent

Event 'BtnMinus'
 &ProductQty= &ProductQty - 1
 Do 'SubTotal'
 Do 'Total'
EndEvent

Event 'SubTotal'
 &ProductSubTotal = &ProductPrice * &ProductQty
 GridProduct.Load()
EndEvent

Event 'Total'
 &ProductTotal = 0
 For Each line in GridProduct
  &ProductTotal = &ProductTotal + &ProductSubTotal 
 EndFor 
 GridProduct.Load()
EndEvent
Solution

  • I solve this problem using 2 situations: To totalize when use button + and -:

    Event 'BtnPlus'
 &ProductQty = &ProductQty + 1
 &ProductTotal = &ProductTotal - &ProductPrice 
 GridProduct.Load()
EndEvent

Event 'BtnLess'
 &ProductQty = &ProductQty - 1
 &ProductTotal = &ProductTotal - &ProductPrice 
 GridProduct.Load()
EndEvent

    And when the cliente type in &ProductQty

    Event &ProductQty.ControlValueChanging(&ProductQtyValue)
    do 'SubTotal'
    do 'Total'
EndEvent

Sub 'SubTotal'
 &ProductSubTotal = &ProductPrice * &ProductQty
EndSub

Sub 'Total'
 &ProductTotal = 0
 For Each line in GridProduct
  &ProductTotal = &ProductTotal + &ProductSubTotal 
 EndFor 
EndSub