How to create validation on textbox using Visual Basic?

Asked By johnrick 100 points N/A Posted on - 04/23/2011

I have a textbox that will accept the quantity of products ordered.

It should allow only numbers.

Thanks

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Answered By jhoel 0 points N/A #87646

How to create validation on textbox using Visual Basic?

 

There are different ways to create validations on textbox. heres a simple one.

 

Often, to ensure that users enter only numbers in a text field,

you'll want to validate the text as they enter it. The textbox's

Change() event provides the best place to do so. However, simply

using the Is Numeric() function alone won't do the trick. For

instance, suppose you created the following procedure

private sub text1_change()

 

if not isnumeric(text1.text) then

 

text1.text=""

 

end if

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• Posted on - 04/23/2011
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Answered By johnrick 100 points N/A #87648

How to create validation on textbox using Visual Basic?

Your code does the job. But  if  the user input is not number, the whole text is erased. what I want is that the textbox will not allow other keys except numbers and still not remove previous numbers inputted by the user.

Thanks

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Answered By techgeek 0 points N/A #87649

How to create validation on textbox using Visual Basic?

Aside from the is numeric function, you can also use the keypress. follow this code and give it a try

Private Sub Text1_KeyPress(KeyAscii as Integer) 

'Ignore negatives 
If KeyAscii = 45 then goto EndProc 
'If Key pressed is not numeric then make key Null 
If (KeyAscii < 48) or (Keyascii >57) then KeyAscii = 0 
Endproc: 
End Sub 

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Answered By jhoel 0 points N/A #87650

How to create validation on textbox using Visual Basic?

That's a nice idea Mr Techgeek.. That textbox will look more professional using your code..

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• Posted on - 04/24/2011
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Answered By johnrick 100 points N/A #87651

How to create validation on textbox using Visual Basic?

Thanks for the knowledge you’ve shared with me. It can help a lot for my project. thanks again.

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• Posted on - 04/24/2011
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Answered By techgeek 0 points N/A #87652

How to create validation on textbox using Visual Basic?

You're always welcome.. feel free to ask here in techyv if you have problems.

A lot of expert here will help you..

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