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Part 5: Automating an Access Application
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Understanding Event Processing Event Property (Event Name)
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Runs the specified macro, Visual Basic function, or Visual Basic event procedure whenever the user first changes the contents of a bound control on a bound form (a form that has a record source). This event also occurs if your code changes the value of a bound control from a macro (SetValue) or a Visual Basic procedure. Your code that responds to this event can verify that the current record can be updated. Your code can cancel this event to prevent the update. After this event occurs, the Dirty property of the form is True until the record is saved. Runs the specified macro, Visual Basic function, or Visual Basic event procedure when the user types an entry in a combo box that does not exist in the current recordset defined by the Row Source property for the combo box. Your code cannot cancel this event. Your code can allow the user to create a new entry for the combo box (perhaps by adding a record to the table on which the Row Source property is based). In a Visual Basic procedure, you can examine a parameter passed to the event procedure that contains the unmatched text. Your code can also set a return value to cause Access to display the standard error message, display no error message (after your code has issued a custom message), or requery the list after your code has added data to the Row Source property. Runs the specified macro, Visual Basic function, or Visual Basic event procedure when the user undoes a change in a form or a text box or combo box control that has been committed to the form s record buffer. See the following section, Understanding Event Sequence and Form Editing, for details. The Undo event does not occur when the user chooses the Undo Typing command. Your code that responds to the event can examine both the current and previous values of the control and cancel the event if the change should not be undone. Runs the specified macro, Visual Basic function, or Visual Basic event procedure after the data in a form s object frame control changes. Your code cannot cancel this event. In a Visual Basic procedure, your code can examine a status parameter to determine how the change occurred.
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You can cause an endless loop if your code changes the contents of a control within the event procedure for the control s Change event.
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Part 5: Automating an Access Application
Microsoft Office Access 2003 Inside Out
Detecting Focus Changes
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Part 1: Part Title
Event Property (Event Name)
On Activate (Activate)
Description
Runs the specified macro, Visual Basic function, or Visual Basic event procedure in a form or a report when the Form or Report window receives the focus and becomes the active window. This event does not occur for pop-up or modal forms. This event also does not occur when a normal Form or Report window regains the focus from a pop-up or modal form unless the focus moves to another form or report. This event is most useful for displaying custom toolbars when a form or a report receives the focus. Your code cannot cancel this event. Runs the specified macro, Visual Basic function, or Visual Basic event procedure in a bound form when the focus moves from one record to another but before Access displays the new record. Access also triggers the Current event when the focus moves to the first record as a form opens. This event is most useful for keeping two open and related forms synchronized. Your code cannot cancel this event. Your code can, however, use GoToRecord or similar action to move to another record if it decides that the form display should not move to the new record. Runs the specified macro, Visual Basic function, or Visual Basic event procedure when a form or a report loses the focus to a window within the Access application that is not a pop-up or modal window. This event is useful for closing custom toolbars. Your code cannot cancel this event. Runs the specified macro, Visual Basic function, or Visual Basic event procedure when the focus moves to a bound object frame, a combo box, a command button, a list box, an option group, or a text box, as well as when the focus moves to a check box, an option button, or a toggle button that is not part of an option group. Your code cannot cancel this event. This event occurs only when the focus moves from another control on the same form. If the user changes the focus to another control with the mouse, this event occurs before LostFocus in the current control and before the Enter, GotFocus, MouseDown, MouseUp, and Click events for the new control. If the user changes the focus to a control using the keyboard, this event occurs after the KeyDown and Exit events in the control that previously had the focus but before the Enter, GotFocus, KeyPress, and KeyUp events in the control that is receiving the focus.
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