SENSING TEXT BOX DATA TYPE? - Visual Basic 4 / 5 / 6

J. C. O'Connell

hi,

I HAVE A TEXT BOX THAT I WANT THE USER TO ENTER A NUMBER IN.
HOW DO I PREVENT RUN TIME ERROR IF THEY ENTER A STRING INSTEAD?
I GUESS I NEED SOME TYPE OF DATA TYPE SENSING COMMAND BUT I
DONT KNOW WHAT IT IS.
jco

Jul 17 '05 #1

Subscribe Reply

4542

Kris M

Private Sub Text1_KeyPress( KeyAscii As Integer) If (KeyAscii < 48 Or
KeyAscii > 57) And KeyAscii <> 46 Then KeyAscii = 0 End IfEnd
Sub"J. C. O'Connell" <hi******@gate. net> wrote in message
news:3f******** ******@news.gat e.net...> hi,

I HAVE A TEXT BOX THAT I WANT THE USER TO ENTER A NUMBER IN.
HOW DO I PREVENT RUN TIME ERROR IF THEY ENTER A STRING INSTEAD?
I GUESS I NEED SOME TYPE OF DATA TYPE SENSING COMMAND BUT I
DONT KNOW WHAT IT IS.
jco

Jul 17 '05 #2

Bruce W. Roeser

Kris,

Whoops ... I left off a conversion (chr$(KeyAscii) ). Use this instead.

It's a few more keystrokes than the other example (which is also valid
except for the backspace) but it is good programming practice to write your
code so if someone else comes along they can understand the intent. While
this is an overly simple section of code, developing that habit will pay
off. The extra time making code clear can pay off big-time later when
trying to find bugs.

Private Sub Text1_KeyPress( KeyAscii As Integer)
'
' Invalidate keystroke if not a digit, decimal point or backspace.
'
If (Not IsNumeric(chr$( KeyAscii)) And (chr$(KeyAscii) <> "." And
KeyAscii <> vbBack)) Then
KeyAscii = 0
Endif

End Sub

HTH,

-bruce

"Kris M" <ma******@yahoo .com> wrote in message
news:bY******** ************@co mcast.com...

Private Sub Text1_KeyPress( KeyAscii As Integer) If (KeyAscii < 48 Or
KeyAscii > 57) And KeyAscii <> 46 Then KeyAscii = 0 End IfEnd
Sub"J. C. O'Connell" <hi******@gate. net> wrote in message
news:3f******** ******@news.gat e.net...> hi,

I HAVE A TEXT BOX THAT I WANT THE USER TO ENTER A NUMBER IN.
HOW DO I PREVENT RUN TIME ERROR IF THEY ENTER A STRING INSTEAD?
I GUESS I NEED SOME TYPE OF DATA TYPE SENSING COMMAND BUT I
DONT KNOW WHAT IT IS.
jco

Jul 17 '05 #3

Bruce W. Roeser

Close ... the user needs to be able to backspace as well. Also - write the
code so someone else can read it.

Private Sub Text1_KeyPress( KeyAscii As Integer)
'
' Invalidate keystroke if not a digit, decimal point or backspace.
'
If (Not IsNumeric(chr$( KeyAscii)) And (KeyAscii <> "." And KeyAscii <>
vbBack)) Then
KeyAscii = 0
Endif

End Sub

"Kris M" <ma******@yahoo .com> wrote in message
news:bY******** ************@co mcast.com...

Private Sub Text1_KeyPress( KeyAscii As Integer) If (KeyAscii < 48 Or
KeyAscii > 57) And KeyAscii <> 46 Then KeyAscii = 0 End IfEnd
Sub"J. C. O'Connell" <hi******@gate. net> wrote in message
news:3f******** ******@news.gat e.net...> hi,

I HAVE A TEXT BOX THAT I WANT THE USER TO ENTER A NUMBER IN.
HOW DO I PREVENT RUN TIME ERROR IF THEY ENTER A STRING INSTEAD?
I GUESS I NEED SOME TYPE OF DATA TYPE SENSING COMMAND BUT I
DONT KNOW WHAT IT IS.
jco

Jul 17 '05 #4

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