FIX: Clicking Page Does Not Call Valid of Text or Edit Box

ID: Q191324

The information in this article applies to:
  • Microsoft Visual FoxPro for Windows, versions 5.0, 5.0a

SYMPTOMS

If you have a text box or an edit box on a pageframe page, and you change the value in the text box, then click the page itself (not the page tab), then click back in the text box, the value in the text box reverts to its value prior to the change you made, and the change is not made to the text box ControlSource.


CAUSE

The Valid event does not get called for the text box, so the new value is never written to the text box's ControlSource.


RESOLUTION

Please see the MORE INFORMATION section for possible workarounds.


STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in Visual FoxPro, 6.0.


MORE INFORMATION

Steps to Reproduce Behavior

  1. RUN THE FOLLOWING CODE FROM A PROGRAM (.PRG) file: 
    
      CREATE TABLE testtab (f1 c(10))
      INSERT INTO testtab VALUE ('abcde')

      PUBLIC oform1
      oform1=CREATEOBJECT("form1")
      oform1.SHOW
      RETURN

      DEFINE CLASS form1 AS FORM
         AUTOCENTER = .T.
         CAPTION = "Form1"
         NAME = "Form1"

         ADD OBJECT pageframe1 AS PAGEFRAME WITH ;
            ERASEPAGE = .T., ;
            PAGECOUNT = 2, ;
            TOP = 20, ;
            LEFT = 20, ;
            WIDTH = 340, ;
            HEIGHT = 215, ;
            NAME = "Pageframe1", ;
            Page1.CAPTION = "Page1", ;
            Page1.NAME = "Page1", ;
            Page2.CAPTION = "Page2", ;
            Page2.NAME = "Page2"

         PROC pageframe1.INIT
            THIS.Page1.ADDOBJECT('text1','textbox')
            WITH THIS.Page1.text1
               .CONTROLSOURCE = "testtab.f1"
               .HEIGHT = 23
               .LEFT = 107
               .TOP = 80
               .WIDTH = 100
               .NAME = "Text1"
               .VISIBLE = .T.
            ENDWITH
         ENDPROC

      ENDDEFINE


  2. Append some text to the text present in the text box, such as "fgh".


  3. Click the page outside of the text box (not on the Page tab). The focus moves to the page.


  4. Click back in the text box.


The appended text disappears. The order in which the events fire follows. Note that the Valid event never fires for the text box. 

   form1.pageframe1.page1.text1.InteractiveChange()
   form1.pageframe1.page1.text1.LostFocus()
   form1.Paint()
   form1.pageframe1.page1.Click()
If you click the tab of the page, rather than the page, then back on the text box, the textbox.Valid fires and the new value is retained. This also happens if the text box is not located on a page, but on the form itself, if you click on a page.

NOTE: This behavior also occurs with an edit box control.

Possible Workarounds

Here are two workarounds:

  • If the text box uses a table or view field as a ControlSource, issue a REPLACE of the text box ControlSource with the textbox Value in the LostFocus method of the text box as follows: 
    
      REPLACE (This.ControlSource) WITH (This.Value)


    • If the text box uses a property or variable as its ControlSource, store its Value to the ControlSource in the LostFocus method of the text box. For example: 
    
   STORE this.Value TO (This.ControlSource)
  • Add a shape control to the page. Make the shape the same size as the page, set its BorderStyle to 0 - Transparent. Add a NODEFAULT command to the shape's Click method. Select Format from the menu, and then choose Send to Back to place the shape behind the text box. After doing this, when you click the page outside the text box, the focus does not move from the text box, and the problem does not occur.



REFERENCES

(c) Microsoft Corporation 1998, All Rights Reserved. Contributions by Jim Saunders, Microsoft Corporation

Additional query words: kbVFp600fix kbVFp500abug kbOOP

Keywords :
Version : WINDOWS:5.0,5.0a
Platform : WINDOWS
Issue type : kbbug


Last Reviewed: August 16, 1999
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