Microsoft KB Archive/105977

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PRB: Setting OnEnter to TAB and OnExit to SHIFT+TAB Loops

Article ID: Q105977
Creation Date: 28-OCT-1993
Revision Date: 01-DEC-1996 The information in this article applies to:

  • Microsoft Access versions 1.0, 1.1, 2.0, 7.0, 97

SYMPTOMS


Moderate: Requires basic macro, coding, and interoperability skills.

If you set the OnEnter property of text box on a form to run a macro that sends a TAB, and you set the OnExit property of the text box to run a macro that sends a SHIFT+TAB, an infinite loop occurs when you view the form in Form view.

CAUSE


When you view the form in Form view, the text box control's OnEnter property runs a macro that sends a TAB. The TAB triggers the control's OnExit property, which runs a macro that sends a SHIFT+TAB. The SHIFT+TAB triggers the OnEnter property again, and so on.

RESOLUTION


The macros are performing as they should. Press CTRL+BREAK to cause the macros to stop running.

MORE INFORMATION


Steps to Reproduce Behavior


  1. Create the following macros:

          Macro Name       Action
          -------------------------
          Tab              SendKeys
          ShiftTab         SendKeys
          Tab Actions
          --------------------
          SendKeys
             Keystrokes: {tab}
             Wait: No
          ShiftTab Actions
          ---------------------
          SendKeys
             Keystrokes: +{tab}
             Wait: No
  2. Create a new form. Add two text boxes to the form.
  3. Set the first text box's OnEnter property to Tab, and its OnExit property to ShiftTab.
  4. View the form in Form view. Note that an infinite loop occurs.



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©1997 Microsoft Corporation. All rights reserved. Legal Notices.


KBCategory: kbusage
KBSubcategory: FmsEvnt
Additional reference words: 1.00 1.10 2.00 7.00 97 8.00 on enter exit