how prevent user writing letters into a textbox

**fabianus** · Jan 2nd, 2007, 01:08 PM

Hello !

Could someone telle me how to prevent a user to write letters into a textbox (to allow only numbers). In general, I would like to solve this, how to define what a user my type into a textbox (Forms.TextBox).

Thanks a lot for any feedback.

Regards,
Fabian

**tarponkeith** · Jan 2nd, 2007, 01:24 PM

This isn't perfect (if the end user starts pressing multiple buttons it will mess up), but it's a start... The easier method might be doing a search for "Masked Edit Control" or "Masked Text Box"...

VB Code:

Private Sub Text1_KeyUp(KeyCode As Integer, Shift As Integer)
  If KeyCode < 48 Or KeyCode > 57 Then
  
    Text1.Text = Left$(Text1.Text, Len(Text1.Text) - 1)
    Text1.SelStart = Len(Text1.Text)
    
  End If
  
End Sub

**RhinoBull** · Jan 2nd, 2007, 01:27 PM

The following will prevent users from typing non-numeric values, however they can still paste it:

VB Code:

Private Sub Text1_KeyPress(KeyAscii As Integer)
    'check if value is numeric
    If Not IsNumeric(Chr(KeyAscii)) Then
        'allow backspace and enter keys only
        If Not (KeyAscii = 8 Or KeyAscii = 13) Then
            KeyAscii = 0
        End If
    End If
End Sub

To prevent from pasting you will have to subclass few messages but this will get you started at least.

**tarponkeith** · Jan 2nd, 2007, 01:29 PM

RhinoBull's way is better

**newprogram** · Jan 2nd, 2007, 01:37 PM

the tread might help http://www.vbforums.com/showthread.p...number+textbox

**fabianus** · Jan 2nd, 2007, 03:35 PM

Hello all,

I can not believe that there is no way to limit input characters without need to code. In the most simpliest programming studios you have such ways. Like telling an "allowedCharacters" property "0-9" (which would only allow numbers) or "0.0" wich will force a number with one digit befor and one after the dot etc.

Certainly the validate methode makes all possible, but it would be so much easier as I told.

Regards,
Fabian

**DigiRev** · Jan 2nd, 2007, 03:58 PM

There's also an easy API method that sets the TextBox to numeric only. I don't remember who posted the code...bushmobile I think...

**RhinoBull** · Jan 2nd, 2007, 04:06 PM

Originally Posted by fabianus

Hello all,

I can not believe that there is no way to limit input characters without need to code...

Unfortunately in VB6 there isn't any property that you can specify so you pretty much on your own.

**RhinoBull** · Jan 2nd, 2007, 04:08 PM

Originally Posted by DigiRev

There's also an easy API method that sets the TextBox to numeric only. I don't remember who posted the code...bushmobile I think...

Sample code was posted numerous times by several members. MartinLiss has a link in his signature to (I think) custom Numeric Textbox control.

**fabianus** · Jan 2nd, 2007, 05:16 PM

Oh guys, excuse-me so much. I posted in the wrong forum ! I need the answer for .NET ! :-(

Excuse me.

Regards,
Fabian

**RhinoBull** · Jan 2nd, 2007, 05:22 PM

Try this thread then.

**GaryMazzone** · Jan 3rd, 2007, 08:51 AM

You could also use a masked edit textbox instead of the standard textbox and set the mask to all numbers.

**RhinoBull** · Jan 3rd, 2007, 08:58 AM

Masked Edit control was already suggested in post #2. Also, not sure of you noticed but he posted in the wrong forum - VB.Net is what he works with.

**GaryMazzone** · Jan 3rd, 2007, 09:34 AM

I didn't notice that in Post #2 but is is still avail in .Net (I use it regularly to ensure numbers only).

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