Article: Q138499
Product(s): Microsoft FoxPro
Version(s): WINDOWS:3.0
Operating System(s):
Keyword(s):
Last Modified: 11-FEB-2000
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The information in this article applies to:
- Microsoft Visual FoxPro for Windows, version 3.0
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SUMMARY
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You can limit the number of characters that a user can type into a text box by
using the InputMask property. However, this property does not exist for a combo
box. This article shows shows by example how to limit the number of characters
typed in a combo box by placing code in the KeyPress event.
MORE INFORMATION
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Step-by-Step Example
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1. Create a new form.
2. On the Form menu, click New Property, and name the new property numb.
3. Place a combo box on the form, and set its ControlSource, RowSourceType, and
RowSource properties.
4. Place at least one other control on the form.
5. Place the following code in the KeyPress event for the combo box to limit the
number of characters entered into the combo box to 3:
IF nKeyCode=13 OR nKeyCode=9 && test for ENTER or TAB
THISFORM.numb=0 && and reset numb
ELSE
IF !(nkeyCode=127 OR ; && BACKSPACE
nkeyCode=7 OR ; && DELETE
nkeyCode=6 OR ; && END key
nkeyCode=19 OR ; && LEFT ARROW
nkeyCode=4 OR ; && RIGHT ARROW
nkeyCode=1) && HOME key
THISFORM.numb=THISFORM.numb+1 && if not one of the above increment
IF THISFORM.numb=4 && When 4 characters have been entered
THISFORM.numb=0 && reset numb to zero and flash a message
?? CHR(7) && ring the bell
=MESSAGEBOX("Enter only 3 characters")
NODEFAULT && do not enter the character typed.
ENDIF
ENDIF
ENDIF
Additional query words: VFoxWin mask format
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Keywords :
Technology : kbVFPsearch kbAudDeveloper kbVFP300
Version : WINDOWS:3.0
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