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What Are Events
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An event is something that happens to a certain object, a recognized action that occurs and triggers some type of response For example, when you click a command button, the Click event occurs and the command button s event property specifies a response Access is an event-driven program, which means it responds to a variety of events as they occur In fact, if no event occurs, nothing happens at all Events are usually triggered by the user, but Access also responds to events resulting from system changes or external influences For example, a specified timer interval expires, data in the table changes, linked data is updated, or a filter finds no records that match the criteria When an event occurs, you can have Access respond with a specific action by running a macro or executing a VBA procedure The macro or VBA procedure is attached to an event property of the object to which the event occurs For example, suppose that when the user clicks a command button, you want the Alpha Entry form to open You would create a macro or VBA procedure that opens the form and specifies it as the On Click event property for the command button
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TIP When you create a command button using the Command Button Wizard, the wizard
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automatically creates a VBA procedure and adds it to the button s On Click property The next chapter discusses creating macros that respond to events For now, let s take a close look at events and when they occur
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Types of Events
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Events are grouped into eight categories, depending on the effects of the event For example, some events relate to the data, others to filters, and still others to keyboard actions The following sections describe each type of event and list the commonly used events that fall into each classification Each event corresponds to a property of the object to which it applies The property usually has the same name or a name similar to the event (but with spaces and sometimes beginning with On) For example, the Change event corresponds to the On Change property of several controls You can set the property to respond to the event in a specified way
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Data Events
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A Data event occurs when data is entered, edited, or deleted in a datasheet or a form For example, when the user enters data into a text box control in a form or selects a value from a combo box, a Data event occurs In addition, when the entry focus moves from one record to another, this is classified as a Data event A control has focus when it can receive user input by means of the mouse or keyboard action Table 18-1 describes some of the more common Data events and the Access objects to which each applies Here s some additional information about Data events and their uses: The BeforeUpdate and AfterUpdate events don t occur when the value in a calculated field changes You can use the BeforeUpdate record event to validate data, especially with complex validation rules that involve more than one value You can display different error messages for different data, giving the user the opportunity to override the rule violation, if desired Use the Validation Rule property for controls in a form, as well as the Validation Rule and Required properties specified in the table design for fields and records in forms The BeforeUpdate event can also be used to cancel updating the record before moving to another record in case of an error It can also check to see whether a value was already entered in the control You can use the AfterInsert event to requery the underlying recordset (the datasheet result of running the query) to incorporate new data when a record is added to the form The Change event can be used to coordinate data among several controls in the form A problem can occur when you use the NotInList event to enable the user to add a value to the combo box list If you set the AutoExpand property for the combo box control to Yes, Access selects matching values from the list as you enter characters in the text box part of the control So, if you want to add the name John to the list, but Johnston is already on the list, the AutoExpand property fills out the complete Johnston value and the NotInList event doesn t occur The cure for this is to enter a space after you enter the new value, so it no longer
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