VB - Numeric Textbox input only

[x-ice]

As you type the text

Private Sub Textbox1_KeyPress(index As Integer, KeyAscii As Integer)
'Accepts only numeric input
Select Case KeyAscii
  Case vbKey0 To vbKey9
  Case vbKeyBack, vbKeyClear, vbKeyDelete
  Case vbKeyLeft, vbKeyRight, vbKeyUp, vbKeyDown, vbKeyTab
  Case Else
    KeyAscii = 0
    Beep
End Select
End Sub

Clicking a command button to validate

Private Sub Command1_Click()
    If Not IsNumeric(Text1.Text) Then
        MsgBox "Please enter numbers only.", vbInformation
        'you may also consider erasing it
        Text1.Text = ""
    End If
End Sub

[CVMichael]

You know, every textbox has a "Validate" event...

Private Sub Text1_Validate(Cancel As Boolean)
    If Not IsNumeric(Text1.Text) Then
        MsgBox "Please enter numbers only.", vbInformation
        'you may also consider erasing it
        Text1.Text = ""
        
        Cancel = True
    End If
End Sub

Much better than checking in multiple places...

[x-ice]

My code checks as each character is typed, therefore literally stopping you typing text

[necalabria]

Hi x-ice,

I'm pretty new working with VB. Actually I'm usign your code to have a numeric textbox. Thank you and thank VB Forums. I have another problem: What do I need to to allow negative numbers and limit to specific number of decimals?

Yor help will be highly appreciated.

Necalabria

[laudeniold]

Private Sub txtCTC_KeyPress(KeyAscii As Integer)
If Chr(KeyAscii) Like "[a-z]" And KeyAscii <> 8 Then KeyAscii = 0
End Sub

This works good.

[lavalove]

I think it is also good to mention for newer programmers that you can add as many validations as you want with "If Else" statements to clean up code using your second set of code
ex. from personal project for a POS system for a coffee shop
If Not IsNumeric(CappacinoTextBox.Text) Then
MsgBox("Please enter numbers only.", vbInformation)
'Validate CappacinoTextBox
CappacinoTextBox.Text = ""
ElseIf Not IsNumeric(LatteTextBox.Text) Then
MsgBox("Please enter numbers only.", vbInformation)
'Validate LatteTextBox
LatteTextBox.Text = ""
ElseIf Not IsNumeric(ChaiTeaTextBox.Text) Then
MsgBox("Please enter numbers only", vbInformation)
'Validate ChaiTeaTextBox
ChaiTeaTextBox.Text = ""
End If

Will validate every one of those text boxes in one block of code so anyone who picks up your code later can get all your validations in one place.

[jmsrickland]

Text1_Validate(Cancel As Boolean) doesn't work

[jmsrickland]

laudeniold has a good idea to start with but it doesn't stop typing in special characters

[fifis_flight]

this works really well ♥

[_clint]

My code checks as each character is typed, therefore literally stopping you typing text

But it doesn't consider pasting characters, for instance, when using the edit box's context menu.

Therefore, you will need additional code in the Change or Validate events.