Making VBA Form TextBox accept Numbers only (including +, - and .)

Question

I have simple textBox and I want to validate its input including \"+\" , \"-\" and \".\" here is what I have tried

Private Sub DisplayValue_TextBox_Change()         


        

Answer 1

I use this. It will allow only numbers with decimals.

Private Sub TextBox1_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger)
    Select Case KeyAscii
        Case vbKey0 To vbKey9, vbKeyBack, vbKeyClear, vbKeyDelete, _
        vbKeyLeft, vbKeyRight, vbKeyUp, vbKeyDown, vbKeyTab
            If KeyAscii = 46 Then If InStr(1, TextBox1.Text, ".") Then KeyAscii = 0
        Case Else
            KeyAscii = 0
            Beep
    End Select
End Sub

Answer 2

use the KeyPress event, and discard any non-numeric entry:

Private Sub txtShift1_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger)
Debug.Print KeyAscii
If KeyAscii >= 48 And KeyAscii <= 57 Then
    Debug.Print "number"
Else
    Debug.Print "other"
    KeyAscii = 0
End If
End Sub

Answer 3

If TextBox1.Value <> "" Then
    Dim N As Boolean
    N = True
    Do While N
        If Not IsNumeric(TextBox1.Value) Then
            TextBox1.Value = Left(TextBox1.Value, Len(TextBox1.Value) - 1)
        Else
            N = False
        End If
    Loop
End If

Answer 4

Having relied up till now on string parsing to do this job, I'm glad I decided to check and see how other people do it and found this Q.

I've refined Ruben Alvarez's excellent answer. The below will allow numerical entries only, and only one decimal point.

Private Sub txtShift1_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger)

    Select Case KeyAscii
        Case 46
            If InStr(1, txtShift1, ".") > 0 Then KeyAscii = 0
        Case 48 To 57
        Case Else
            KeyAscii = 0
    End Select

End Sub

This could be further refined to allow only a single "+", "-" etc. as necessary.

Answer 5

Private Sub TbCout_D_Edlp_Change()

Dim NotNumeric As Boolean

Dim TempValue As String

 If Not IsNumeric(TbCout_D_Edlp.Value) Then

    If TbCout_D_Edlp.Value <> "" Then
    
          NotNumeric = True
          
          MsgBox "Only numbers allowed"
          
          TempValue = Left(Me.TbCout_D_Edlp.Value, Len(Me.TbCout_D_Edlp.Value) - 1)
          
          While NotNumeric = True And TempValue <> ""
          
               If Not IsNumeric(TempValue) Then
          
                    TempValue = Left(TempValue, Len(TempValue) - 1)
                    
               
               Else
                    
                    NotNumeric = False
                    
               End If
    
          Wend
          
          Me.TbCout_D_Edlp.Value = TempValue
            
    End If
    
 End If

End Sub

Answer 6

Further to my comment:

Consider a sample Userform1 with a Textbox1 and a CommandButton1

when you enter anything in the TextBox1 the change event fires - ie. typing one character fires the Change() event and passes the current value so even when you type in the negative sign your current logic fails.

What you need is to use another event like _AfterUpdate() or _Exit() with an amphasis on the second one because your can cancel the event :)

Private Sub TextBox1_Exit(ByVal Cancel As MSForms.ReturnBoolean)
    If Not IsNumeric(TextBox1.Value) Then
        MsgBox "only numbers allowed"
        Cancel = True
    End If
End Sub

You can find events here: