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Part 4 Advanced VBA
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Microsoft Office Excel 2003 Programming Inside Out An Excel password can be up to 15 characters in length, but it s a good idea to require users to use passwords that are at least 8 characters long.
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For more information on using the LEN to verify that a password contains at least one non-alphanumeric character, see Returning Characters from Arbitrary Positions in a String later in this chapter.
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When to Validate, and When to Use an If Then Statement When you re working with values that need to be a certain length, you have a choice of methods to make certain everything falls into line. Way back in 8, you learned how to use the Range object s Validation property to establish criteria that a cell s value must meet before being accepted. You can set the Validation object s Type parameter to xlValidateTextLength to have Excel check a cell s value to ensure it is of the proper length. Of course, you can use an If Then rule to the same effect. So why would you choose one method over the other You should use a Range object s Validation property when You want to create a single rule that is easily expressed using the Validation property s parameters. You want the input box to have a specific title and to be grouped with the validation rules. You want to display a specific type of message box (information, warning, or stop) and have the behavior (whether to move to the next cell or not) programmed as part of the message box type. You want to have all the criteria stored in a single object. You should use an If Then Else statement when You want to have multiple crite ria and find that using multiple If...Then Else constructions is easier than using the Validation object s Modify method. You want to have conditional criteria that change depending on a set of circum stances. For example, the maximum credit limit an employee can assign to a cus tomer could vary by employee.
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Part 4: Advanced VBA
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Some of the procedures you ve encountered so far in this book have generated message boxes using the text from one or more variables or worksheet cells as part of the message box s prompt. The authors of this book admit to playing a bit fast and loose with the order of top ics, but now is the time to bring everything up to date by showing you how to add text from a cell, a variable, or a literal into a single output. You use the & operator.
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Manipulating Data with VBA There is a potential trap here, mainly because many readers will be familiar with the amper sand character, &, as the equivalent of the word and. Also, if you have previous programming experience, you might have used the & operator to indicate a logical "and" in expressions such as
If ((Range("C5").Value >= 1000) & (Range("D5")<=10)) Then
Don t fall into that trap! The VBA concatenation operator & is not the same as the logical And operator, the latter of which is spelled out as the word And. The previous If condition statement is properly written as
If ((Range("C5").Value >= 1000) And (Range("D5")<=10)) Then
The concatenation operator is fairly straightforward to use. For example, you could use the concatenation operator in conjunction with the LEN function described earlier to indicate why the data typed into a cell is invalid.
Public Sub VerifyLength()
If Len(ActiveCell.Value) <> 10 Then
MsgBox ("The produ ct code entered is " & LEN(ActiveCell.Value) & _ " characters, not 10.") ActiveCell.Value = "" End If End Sub
The LEN function and the & operator are also useful if you need to add characters to a cell value or a variable so the text is the expected length for export to a program that requires fixed-length data. To add characters to the beginning or end of a string, you use the REPT function in combination with the & operator. The REPT function has the following syntax:
Application.WorksheetFunction.REPT(string, times)
The string parameter provides the string to be repeated, and times indicates the number of times the character should be repeated. For example, if you worked for a fast-growing com pany that used a variable-length order code to track orders, you might need to change the 5-character code to a 10-character code. That s no problem in Excel all you need to do is repeat a zero at the front of each order code to bring the length up to 10 characters. The fol lowing procedure checks the length of the order code string in the cells the user identifies and adds enough x s to make the string 10 characters long:
Public Sub MakeTen() Dim strFirst, strLast, strAllCells, strPadding, strContents As String Dim intPadding As Integer strFirst = InputBox("Enter the address of the first cell.") strLast = InputBox("Enter the address of the last cell.") strAllCells = strFirst & ":" & strLast
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