PRB: Controls in a Page Frame Are Not Refreshed

• Microsoft Visual FoxPro for Windows, versions 3.0, 5.0, 5.0a

SYMPTOMS

In a page frame, you observe that only the controls placed on the active page are refreshed when data changes. Controls in underlying pages are not refreshed until they receive the focus.

CAUSE

For performance reasons, only the active page in a page frame is refreshed when a form is refreshed. This is by design.

WORKAROUND

Alternatives include explicitly calling the Refresh method for each page that is to be refreshed. For example, it is possible to define a method that loops through the pages in a page frame and refreshes all the pages. The following code sample illustrates this method.

Code Sample

* Call this method ,and pass the name of the page frame as a
* parameter.
* For example,
*    Thisform.RefreshAllPages('PageFrame1')
*
PROCEDURE RefreshAllPages
PARAMETER tcPageFrameName
oRef=EVAL('thisform.'+tcPageFrameName)
FOR I=1 TO oRef.PageCount
   oRef.Pages(I).Refresh
ENDFOR
Thisform.Refresh 

Alternative Workaround

   This.Refresh 

STATUS

This behavior is by design.

MORE INFORMATION

Steps to Reproduce Behavior

1. Create a Form.



2. Place a page frame on the Form.



3. Using the secondary (right) mouse button, click the form. Then select Data Environment. Add the Employee table, located in the Samples\Data directory, to the Data Environment.



4. Click Page1 on the Object menu in the Property sheet.



5. Select the text box control from the Form Controls toolbar, and place the text box on Page1. Modify the ControlSource property to be:

   
      Employee.Emp_id 




6. Place another text box on Page1, and modify the ControlSource property to be:

   
      Employee.Last_name 

   NOTE: This step is important as the controls that do not have the focus when the page is activated are not refreshed.



7. Select Page2, and place two text boxes on that page. Change the ControlSource property of the controls to Employee.Address and Employee.City, respectively.



8. Place a command button on the form, and place the following code in its Click event method:

   
      SKIP
      ThisForm.Refresh 




9. Save and run the form. Click the command button to skip through the table, and activate each page. The data on the second text box is not refreshed.

Additional query words: VFoxWin

Keywords :
Version : WINDOWS: 3.0,5.0,5.0a
Platform :
Issue type :