PRB: SetFocus Doesn't Work When Called in the Valid Event

• Microsoft Visual FoxPro for Windows, version 3.0

SYMPTOMS

The SetFocus method does not set the focus to the specified control if placed in the Valid event procedure code of the following controls: list box, text box, combo box, spinner, and edit box. Instead, the focus is placed on the next control in the Tab order.

This behavior happens only with list box, edit box, text box, spinner, and combo box controls. The SetFocus method can be called from the Valid event of command buttons, option buttons, and check boxes.

CAUSE

Control is passed from the current control to the control whose SetFocus method is called, then returns to execute the LostFocus event of the current control. Then the LostFocus by default sets the focus to the next control in the Tab order.

WORKAROUND

Call the SetFocus method for the desired control in the LostFocus event of the current control, rather than in the Valid event.

NOTE: The NODEFAULT command can be used to skip the default behavior in any event or method code, including the LostFocus event. In the case of the LostFocus event, use of NODEFAULT causes the focus to stay on the current control rather than moving to the next control in the Tab order.

STATUS

This behavior is by design.

MORE INFORMATION

In FoxPro version 2.x, the _CUROBJ system variable was used to select the object where the cursor was to be moved. This was often placed in the Valid code snippet of an object. The SetFocus method is used in Visual FoxPro to perform the same functionality, but will not work as expected in the Valid event of certain controls.

Steps to Reproduce Behavior

1. Create a new form, and place four text boxes on it.



2. Place the following command in the Valid event code for Text1:

   
      THISFORM.Text3.SETFOCUS 




3. Save and run the form. Enter some text into Text1, and press ENTER.



4. The focus moves to Text2 rather than Text3. To set the focus to Text3, follow these steps:
   
   
   1. Open the form in design mode.
   
   
   
   2. Double-click the Text1 box.
   
   
   
   3. In the Object combo box, make sure Text1 is selected. In the Procedure combo box, select LostFocus.
   
   
   
   4. Place the following command in the LostFocus event code for Text1:

      
            THISFORM.Text3.SETFOCUS 

   
   
   
   5. In the Procedure combo box, select Valid. Select all the code in the Valid event, and choose Cut from the Edit menu.
   
   
   
   6. Save and run the form.
   
   
   

Additional query words: VFoxWin

Keywords : kbVFp300 FxprgGeneral
Version : WINDOWS:3.0
Platform : WINDOWS
Issue type :