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to validate text box

Posted on 2000-05-15
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Last Modified: 2008-02-20
well i have a text box for which i need to validate the user to enter first 4 characters and then 5 numbers
the characters should be 4 and numbers should be 5
so please help
thanx
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Question by:sonalchouhan
  • 2
4 Comments
 
LVL 43

Expert Comment

by:TimCottee
ID: 2810505
Use a masked edit box control, you can set the mask to be ">????99999" which will only allow 4 letters then 5 numbers, with the letters converted to upper case.
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Expert Comment

by:BobbyOwens
ID: 2810508
Try setting the maxlength to 9. Then in the Validate event, do the following:

Private Sub txtTest_Validate(Cancel As Boolean)

  On Error GoTo txtTest_Validate_Error
 
  Dim intI          As Integer
  Dim strChar       As String
 
'Check length of string
  If Len(txtTest) <> 9 Then
    MsgBox "Invalid Length"
    Cancel = True
    Exit Sub
  End If
'Check 1st 4 characters are A-Z
  For intI = 1 To 4
    strChar = UCase(Mid$(txtTest, intI, 1))
'Check character is between 'A' and 'Z'
    If strChar < "A" Or strChar > "Z" Then
      MsgBox "Character " & intI & " is invalid"
      Cancel = True
      Exit Sub
    End If
  Next intI
'Check numerics
  For intI = 5 To 9
    strChar = UCase(Mid$(txtTest, intI, 1))
    If Not IsNumeric(strChar) Then
      MsgBox "Number " & intI & " is invalid"
      Cancel = True
      Exit Sub
    End If
  Next intI
 
txtTest_Validate_Exit:
  Exit Sub
 
txtTest_Validate_Error:
  MsgBox Err.Description, , "txtTest_Validate"
  Resume txtTest_Validate_Exit
 
End Sub



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LVL 2

Accepted Solution

by:
richtsteig earned 10 total points
ID: 2810526
You can either

use the maskedit-Control with the mask-property set to "&&&&#####".
In this case the user isn't allowed to enter other than the predefined chracters

or

use the LoastFocus-Event of the text box to check the value when the user wants to set the focus to another control
(eg  

Sub Text1_LostFocus()

If Len(text1) <> 9 Then
   MsgBox("Invalid number of characters")
Else

  If not text1.text like "[a-z][a-z][a-z][a-z][a-z]####"
    MsgBox ("Invalid character format")
  End If

End Sub



or use the Change-Event to check every single character when entered

eg
Sub Text1_Change()
Dim i As Integer
Dim iChar as string
For i=1 To Len(Text1)
   iChar = UCase(Mid(Text1,i,1))
   if (i >= 1 and i <=4 and Not iChar >= "A" and iChar <= "Z") or
     (i >=5 and i<= 9 and Not IsNumeric(ichar))  then
         MsgBox("Invalid character at position " & i)
   End If
End Sub

or use the KeyPress-Event to validate a character before accepting it

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LVL 2

Expert Comment

by:richtsteig
ID: 2810538
Tim, Bobby

Sorry bout that, but your typing rate is at a very high level......

you posted your comments while I was typing an answer, that is just a combination of your two comments

Sorry again

Peter
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