text field validation - Xtreme Visual Basic Talk

12-31-2003, 12:44 AM

fastLearner fastLearner is offline

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Join Date: Sep 2003

Posts: 5

text field validation

i have a question about validation in VBscript.
can anyone help me how to make a code that would only validate the string if it contains only letters A-Z if it contains anything else like "#" "@" $" it doesnt get validated.
I know how to validate for numbers using Isnumeric but this is something beyond my knowledge. Please help.

12-31-2003, 01:32 AM

rajeeshun

Senior Contributor

Join Date: Oct 2002

Location: Dubai & Srilanka (Jaffna)

Posts: 1,151

Quote:
Originally Posted by fastLearner
i have a question about validation in VBscript.
can anyone help me how to make a code that would only validate the string if it contains only letters A-Z if it contains anything else like "#" "@" $" it doesnt get validated.
I know how to validate for numbers using Isnumeric but this is something beyond my knowledge. Please help.

Easy way is Find the Keyascii value for the special characters. You cud find this by putting a break point on Keypress event. (I think it is coming around 33 to 37- But not sure)
Then you can validate as usual (Saying keyascii=0)

12-31-2003, 04:23 AM

thingimijig

Senior Contributor

* Expert *

Join Date: Jul 2003

Posts: 1,300

you will need to loop through each char to check if its a letter or any other char.

Code:

Dim i As Integer, counter As Integer

For i = 1 To Len(Text1.Text)
Select Case Asc(Mid$(Text1.Text, i, 1))
Case 65 To 90, 97 To 122 'doesnt count if letters, uppercase or lowercase
Case Else
counter = counter + 1
End Select
Next i

If counter = 0 Then
MsgBox "Validate"
Else
MsgBox "Not valid"
End If

thingimijig.

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