ACC: Macro on Subform Control Executed by Main Form
ID: Q100150
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The information in this article applies to:
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Microsoft Access versions 1.0, 1.1, 2.0, 7.0, 97
SYMPTOMS
Moderate: Requires basic macro, coding, and interoperability skills.
If a macro is attached to the OnEnter or OnExit property of the first
control in the tab order of a subform, the macro will run each time
you move from one record to another in the main form.
In addition, a macro attached to the OnEnter property of the first
control in the tab order of the subform will run when the main form is
opened, and a macro attached to the OnExit property of the first
control in the tab order of the subform will run when the main form is
closed.
NOTE: This behavior is also true for Visual Basic for Applications code
(or Access Basic code in Microsoft Access 2.0 or earlier) attached to the
OnEnter or OnExit property.
CAUSE
To cause a macro to run only when you are actually moving in and out
of the subform, use a test condition with a flag. A macro can set a flag on
the main form to indicate whether the subform was entered by moving into
the subform from the main form. The macro attached to the subform's OnEnter
and OnExit properties can check this flag to see if you really did move
into the subform and continue running if appropriate. The following steps
demonstrate how to set up and test for this condition.
RESOLUTION- Create the following macro called Subform Flag:
Macro Name Action
-----------------------
Set SetValue
UnSet SetValue
Subform Flag Actions
-----------------------
SetValue
Item: [Subform Flag]
Expression: True
SetValue
Item: [Subform Flag]
Expression: False
- For a form named MyForm, add an unbound text box to the main form with
the following properties:
Form: MyForm
Text Box: Subform Flag
Name: Subform Flag (in version 1.x, ControlName: Subform Flag)
Visible: No
Default Value: False
- Select the subform control on the main form and change the following
properties:
Form: MyForm Subform
On Enter: Subform Flag.Set
On Exit: Subform Flag.UnSet
- Add the following macro action to the top of the macro that is
attached to the OnEnter or OnExit property of the first control in
the tab order of the subform. The macro will not perform any other
actions if the subform flag is not set.
Condition Action
-----------------------------------------
Parent![Subform Flag] = False StopMacro
The macro attached to the OnEnter property of the first control in the
subform will not run if you enter the control from the main form and the
control is in the selected record on the subform (denoted by a triangle in
the record selector). As a result, the macro will not run when you enter
the subform by pressing TAB, or by clicking the first control in the
selected record on the subform. However, the macro will run if you click
this control on a different record in the subform.
MORE INFORMATIONSteps to Reproduce Behavior
- Open the sample database Northwind.mdb (or NWIND.MDB in Microsoft Access
versions 1.x and 2.0) and create the following macro called Test:
MacroName Action
--------------------
Test MsgBox
Test Actions
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MsgBox
Message: Testing!
- Open the Orders Subform form and change the OnEnter and OnExit
properties of the PropertyID box ( or Property ID box in versions
1.x and 2.0) box to Test, as follows:
Form: Orders Subform
OnEnter: Test
OnExit: Test
- Save the Orders Subform form, open the Orders form, and move among the
records. Note that the message "Testing!" appears twice for each record.
Additional query words:
exit enter
Keywords : FmsEvnt
Version : 1.0 1.1 2.0 7.0 97
Platform : WINDOWS
Issue type : kbprb
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