c# barcode scanner usb Understanding Events and the Event Model in Microsoft Office

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Understanding Events and the Event Model
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Event AfterInsert AfterUpdate
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Applies To Forms Forms, controls
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When It Occurs After a record is added to the database After a control or record is updated with modified data Also occurs when the control or record loses focus or you choose Save in the Records group on the Home tab to update the current record without moving to another Occurs for both new and existing records When you begin to type the new data in a new record, but before you add the record to the database Before a control or record is updated with modified data Occurs when the control or record loses focus or you choose Save in the Records group on the Home tab Occurs for both new and existing records When the contents of a text box control or the text box portion of a combo box control changes When you type a character in the control or change its Text property with a macro or procedure When focus moves to a record and it becomes the current record When the form is first opened and when the focus moves from one record to another in the form Also when you requery the form s record source by removing the filter or the sort order, or with a macro action When you enter a value in a combo box that isn t in the combo box list
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BeforeInsert BeforeUpdate
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PART III
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Forms
NotInList
Controls
TABLE 18-1 Common Data Events
matches a value in the list You can also simply delete the extra ston characters Then the NotInList event occurs when you move to the next control
C AUTION The Change event can result in cascading events a never-ending loop If the Change
event procedure alters the contents of the control, the Change event occurs again, which triggers the Change event procedure again, and so on If you plan to use the Change event, don t create two or more controls that affect the contents of each other
Error and Timer Events
One error event, Error, is important in an application for handling errors during operation The Error event is often used to intercept Access error messages and replace them with more helpful messages that relate to the application The other error event, Timer, is used for synchronizing data on forms and reports by refreshing the data at regular intervals This event occurs when the interval specified in the form s Timer Interval property has elapsed
Part III:
Improving the Workplace
Filter Events
Filter events apply only to forms and occur when you apply an existing filter or create a new filter for the form The ApplyFilter event occurs when you apply or remove a filter using any of the filter commands The ApplyFilter event can be used to change a form display, so it hides or disables controls, depending on the filter criteria The Filter event occurs when you choose one of the filter methods to create a new filter You can use the Filter event to remove an earlier filter, so extraneous criteria are not carried over to the next filter To do this, set the form s Filter property to a zero-length string using a macro or an event procedure that completely clears the filter criteria
Focus Events
Focus events (see Table 18-2) occur when a form or control gets or loses focus Two Focus events apply to both forms and reports, and they occur when the object becomes active or inactive Some other Focus events apply only to forms or controls in forms The Enter event occurs before focus moves to a control, so you can use the event to display instructions for entering data in the control or other information You can use the GotFocus and LostFocus events to set the control s Visible and Enabled properties These events are also used to display a message in the status bar when a control, such as an Option button, has focus The message clears when the control loses focus
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