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The source code in this issue is designed for all versions of Visual Basic.
We discuss some ways to do keystroke validations. It is geared more towards the beginning VB programmer.
This module contains several short routines that are commonly used in the KeyPress event of various controls, such as the TextBox control. If you want this code to work in VB 3 or earlier you will need to change the return data type from Boolean to Integer.
Function IsAlphaKey(KeyAscii As Integer) As Boolean Function IsNumericKey(KeyAscii As Integer) As Boolean Function IsEditingKey(KeyAscii As Integer) As Boolean Function IsAlphaNumericKey(KeyAscii As Integer) As Boolean
IsAlphaKey checks to make sure KeyAscii is a letter from A to Z. This particular routine will not work for alphabets other than US English. If anyone can modify them appropriately for other languages please email us and we will post them for all our subscribers.
IsNumericKey checks to make sure KeyAscii is a number from 0 to 9. It also checks for a negative sign, decimal character and comma.
IsEditingKey checks to make sure KeyAscii is a backspace character.
IsAlphaNumericKey called IsAlphaKey and IsNumericKey together and therefore validates the character as described in IsAlphaKey and IsNumericKey.
True or False depending on whether keystroke is valid or not.
You would put something like this in the KeyPress event of a control to make sure the user can only enter letters or a backspace.
If IsAlphaKey(KeyAscii) or IsEditingKey(KeyAscii) then Exit Sub Else KeyAscii = 0 ' throw away keystroke End If
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