In our previous post on Find and FindNext we saw that in combination they can be used to search through large amounts of data very quickly.
In many cases we need to use Find and FindNext on a worksheet. The best way to implement repeatable and automated worksheet based functions is through User Defined Function (UDF). This is just a function written in VBA code that can be used on a worksheet.
When using Find and FindNext within a UDF some implementation issues need to be considered. FindNext does not operate within a UDF and we must change the way we use the Find call to give us the same functionality we acheived using Find and FindNext inside a Procedure for the previous post.
Another option to the use of Find and FindNext within a UDF is the used of standard Excel formula SUMPRODUCT. We will provide an example of this formula in a future post.
Now as for the previous example
We have a list of transactions by date for a series of account numbers. We want to calculate the total transactions for each account number into a summary report.
As there are a number of transactions for each Account Number we need to use Find within a User Defined Function to search through the whole range. The function will scan the range and then calculate the total for the specified account number.
Function curCalcTotalValue (strAcctNumber As String) As Currency 'This routine will search and calculate the total value for the Account Number Dim intCountItem As Integer Dim myResult As Range Dim myFirstResult As Range intCountItem = 0 curCalculateTotalValue = 0 With Worksheets("Find").Range("a3:c33") Set myResult = .Find(strAcctNumber, LookIn:=xlValues) If Not myResult Is Nothing Then Set myFirstResult = myResult Do intCountItem = intCountItem + 1 curCalcTotalValue = curCalcTotalValue + myResult.Offset(0, 1).Value Set myResult = .Find(myResult, After:=myResult) Loop While Not myResult Is Nothing And myResult.Address <> myFirstResult.Address End If End With End Function
The result of this Macro is shown here, listing the total of the amounts for each account number. The User Defined Function is specified for each account number.
This calculation is performed in a Function and uses Find to search through the range and calculate the total amount for each account number. In this case the account number becomes a parameter to the function call and provides a simple method of extending the use of the function if new account numbers are included to the list.
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