BUG: Text Box Value Does Not Change If ControlSource Is .NULL.
ID: Q180615
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The information in this article applies to:
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Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a, 6.0
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Microsoft Visual FoxPro for Macintosh, version 3.0b
SYMPTOMS
When the ControlSource property of a text box control is set to the custom
property of a form and the custom property is .NULL., the text in the
control cannot be changed. If the text in the control is edited, the text
changes to .NULL. when the control loses focus.
RESOLUTION
Change the class definition in the code below to add the KeyPress method as
follows:
DEFINE CLASS NewTextBox AS textbox
PROCEDURE KeyPress
LPARAMETERS nKeyCode, nShiftAltCtrl
*-- Once the text has changed, set the custom
*-- property of the form to the text box.
ThisForm.custom_prop = This.Value
ENDPROC
ENDDEFINE
STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed
at the beginning of this article.
MORE INFORMATIONSteps to Reproduce Behavior
- Create a program using the code below that creates a form with a custom
property and two text boxes. The ControlSource of the first text box is
set to the form's custom property.
frmMain = CREATEOBJECT("frmBase")
frmMain.Show
READ EVENTS
DEFINE CLASS frmBase AS Form
*-- Set the property to a character type.
custom_prop = ""
PROCEDURE Init
ThisForm.custom_prop = .NULL.
ENDPROC
PROCEDURE Unload
CLEAR EVENTS
ENDPROC
*-- Create the text box that gives the problem.
ADD OBJECT text AS NewTextBox WITH ;
Left = 100, ;
Top = 0, ;
Width = 250, ;
Name = "txtText",;
NullDisplay = ".NULL.",;
ControlSource = "thisform.custom_prop"
*-- Create another text box to give you something to tab into.
ADD OBJECT text2 AS TextBox WITH ;
Left = 100, ;
Top = 50, ;
Width = 250, ;
Name = "txtText2"
ENDDEFINE
DEFINE CLASS NewTextBox AS textbox
ENDDEFINE
- Run the program and enter text into the first text box.
- Tab to the next text box.
The text in the control changes to .NULL.
Additional query words:
Keywords : kbcode kbMAC kbVFp kbVFp500abug kbVFp500bug kbVFp600 FxtoolFormdes
Version : MACINTOSH:3.0b; WINDOWS:3.0,3.0b,5.0,5.0a,6.0
Platform : MACINTOSH WINDOWS
Issue type : kbprb
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