Solved

Text compare

Posted on 2002-05-13
9
200 Views
Last Modified: 2010-05-02
i having problem text compare where user enter value in text box. i need to make sure is alphanumeric format and no (!, @, #, $, %, ^, etc) format.

how to i write a code to check on this. if i found  !,@ #, etc in the text box then will prompt a mesasge "Wrong format".


0
Comment
Question by:cyseng10
  • 3
  • 2
  • 2
  • +2
9 Comments
 
LVL 43

Expert Comment

by:TimCottee
ID: 7005542
Private Sub Text1_KeyPress(KeyAscii As Integer)
    Select Case Chr(KeyAscii)
    Case "0" To "9" 'Numbers
    Case "a" To "z" 'Lower case
    Case "A" To "Z" 'Upper case
    Case " ", Chr(8) 'Space or delete keys
    Case Else 'Not a valid key so set the keyascii = 0 to ignore the keypress
        KeyAscii = 0
    End Select
End Sub
0
 
LVL 43

Expert Comment

by:TimCottee
ID: 7005544
Actually this does the validation as the key is pressed so that you can be sure that it will always include only alphanumeric characters and spaces.
0
 
LVL 45

Expert Comment

by:aikimark
ID: 7005835
TimCottee,

What happens if the user pastes characters into the textbox?
0
Active Directory Webinar

We all know we need to protect and secure our privileges, but where to start? Join Experts Exchange and ManageEngine on Tuesday, April 11, 2017 10:00 AM PDT to learn how to track and secure privileged users in Active Directory.

 
LVL 43

Expert Comment

by:TimCottee
ID: 7005849
Good point though as Ctrl+V is disabled it would have to be done on the context menu and this could be disabled using the mousedown event.


Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    If Button = 2 Then
        MsgBox "Ha Ha"
    End If
End Sub
0
 
LVL 18

Expert Comment

by:deighton
ID: 7006202
Option Explicit

Private Declare Function IsCharAlphaNumeric Lib "user32" Alias "IsCharAlphaNumericA" (ByVal cChar As Byte) As Long

Private Sub Text1_Change()
Dim c As Long
Dim sTest

Dim k

k = Text1.SelStart



For c = 1 To Len(Text1.Text)
    If IsCharAlphaNumeric(Asc(Mid(Text1, c, 1))) = 1 Then
        sTest = sTest & Mid(Text1, c, 1)
    End If
Next

If Len(sTest) <> Len(Text1.Text) Then
    Text1 = sTest
    Text1.SelStart = k
End If



End Sub

Private Sub Text1_KeyPress(KeyAscii As Integer)
If Not (IsCharAlphaNumeric(KeyAscii) <> 0 Or KeyAscii = vbKeyBack) Then
 KeyAscii = 0
End If
End Sub
0
 
LVL 18

Expert Comment

by:deighton
ID: 7006206
Option Explicit

Private Declare Function IsCharAlphaNumeric _
Lib "user32" Alias "IsCharAlphaNumericA" (ByVal cChar As Byte) As Long

Private Sub Text1_Change()
Dim c As Long
Dim sTest

Dim k

k = Text1.SelStart



For c = 1 To Len(Text1.Text)
    If IsCharAlphaNumeric(Asc(Mid(Text1, c, 1))) = 1 Then
        sTest = sTest & Mid(Text1, c, 1)
    End If
Next

If Len(sTest) <> Len(Text1.Text) Then
    Text1 = sTest
    Text1.SelStart = k
End If



End Sub

Private Sub Text1_KeyPress(KeyAscii As Integer)
If Not (IsCharAlphaNumeric(KeyAscii) <> 0 Or KeyAscii = vbKeyBack) Then
 KeyAscii = 0
End If
End Sub

0
 
LVL 45

Expert Comment

by:aikimark
ID: 7006323
Of course, there is a VBA alternative to IsCharAlphaNumeric API.  You only need extra validation if you allow the user to paste into the textbox.

strTemp = Text1.Text
for i=1 to len(strTemp)
  if mid$(strTemp,i,1) like "[A-Z,a-z,0-9]"
next

Also, if you don't want to allow spaces into the textbox, you will need to modify TimCottee's fourth Case clause.
0
 
LVL 1

Expert Comment

by:Moondancer
ID: 7017651
ADMINISTRATION WILL BE CONTACTING YOU SHORTLY.  Moderators Computer101, Netminder or Mindphaser will return to finalize these if they are still open in 7 days.  Experts, please post closing recommendations before that time.

Below are your open questions as of today.  Questions which have been inactive for 21 days or longer are considered to be abandoned and for those, your options are:
1. Accept a Comment As Answer (use the button next to the Expert's name).
2. Close the question if the information was not useful to you, but may help others. You must tell the participants why you wish to do this, and allow for Expert response.  This choice will include a refund to you, and will move this question to our PAQ (Previously Asked Question) database.  If you found information outside this question thread, please add it.
3. Ask Community Support to help split points between participating experts, or just comment here with details and we'll respond with the process.
4. Delete the question (if it has no potential value for others).
   --> Post comments for expert of your intention to delete and why
   --> YOU CANNOT DELETE A QUESTION with comments; special handling by a Moderator is required.

For special handling needs, please post a zero point question in the link below and include the URL (question QID/link) that it regards with details.
http://www.experts-exchange.com/jsp/qList.jsp?ta=commspt
 
Please click this link for Help Desk, Guidelines/Member Agreement and the Question/Answer process.  http://www.experts-exchange.com/jsp/cmtyHelpDesk.jsp

Click you Member Profile to view your question history and please keep them updated. If you are a KnowledgePro user, use the Power Search option to find them.  

Questions which are LOCKED with a Proposed Answer but do not help you, should be rejected with comments added.  When you grade the question less than an A, please comment as to why.  This helps all involved, as well as others who may access this item in the future.  PLEASE DO NOT AWARD POINTS TO ME.

To view your open questions, please click the following link(s) and keep them all current with updates.
http://www.experts-exchange.com/questions/Q.20118966.html
http://www.experts-exchange.com/questions/Q.20119451.html
http://www.experts-exchange.com/questions/Q.20120253.html
http://www.experts-exchange.com/questions/Q.20140923.html
http://www.experts-exchange.com/questions/Q.20149515.html
http://www.experts-exchange.com/questions/Q.20155217.html
http://www.experts-exchange.com/questions/Q.20163789.html
http://www.experts-exchange.com/questions/Q.20299917.html
http://www.experts-exchange.com/questions/Q.20256679.html



*****  E X P E R T S    P L E A S E  ******  Leave your closing recommendations.
If you are interested in the cleanup effort, please click this link
http://www.experts-exchange.com/jsp/qManageQuestion.jsp?ta=commspt&qid=20274643 
POINTS FOR EXPERTS awaiting comments are listed in the link below
http://www.experts-exchange.com/commspt/Q.20277028.html
 
Moderators will finalize this question if in @7 days Asker has not responded.  This will be moved to the PAQ (Previously Asked Questions) at zero points, deleted or awarded.
 
Thanks everyone.
Moondancer
Moderator @ Experts Exchange
0
 

Accepted Solution

by:
ComTech earned 0 total points
ID: 7184033
This question will be placed in PAQ, and points refunded.

Regards,

ComTech
Community Support Administrator  
Experts-Exchange  
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Most everyone who has done any programming in VB6 knows that you can do something in code like Debug.Print MyVar and that when the program runs from the IDE, the value of MyVar will be displayed in the Immediate Window. Less well known is Debug.Asse…
You can of course define an array to hold data that is of a particular type like an array of Strings to hold customer names or an array of Doubles to hold customer sales, but what do you do if you want to coordinate that data? This article describes…
Get people started with the process of using Access VBA to control Excel using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Excel. Using automation, an Access application can laun…
This lesson covers basic error handling code in Microsoft Excel using VBA. This is the first lesson in a 3-part series that uses code to loop through an Excel spreadsheet in VBA and then fix errors, taking advantage of error handling code. This l…

820 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question