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Workbook events
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Events that occur for a particular workbook. Some examples are the Open, Activate, and NewSheet events. Events that occur for a particular worksheet. Some common exam ples used at the worksheet level are the Calculate, Change, and BeforeRightClick events.
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Worksheet events Chart Events
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Events that occur for a particular chart. Some examples are the Select, Activate, and SeriesChange events. Events that occur for the application, Excel. Several examples would be the SheetChange, NewWorkbook, and WorkbookBeforeClose events.
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Application Events UserForm Events
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Events that occur for a particular User Form or an object contained on the User Form. Some commonly used events are Click and Initialize. 265
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Part 4: Advanced VBA
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Microsoft Office Excel 2003 Programming Inside Out Not all events are defined by all objects. In general, if an object has an event, its parent object will also have the same event. For example, the Change event is contained at the lowest level by the Worksheet object. The Worksheet object s parent is the Workbook object; it also has the same event called Workbook_SheetSelectionChange. The Workbook object s parent, the Application, also has a Change event. The lower event does not need to be programmed in order to receive the event at a higher level. For example, the Workbook_SheetChange event is triggered regardless of whether you have a Worksheet_Change event coded. When evaluating the results you want to achieve with your event procedure, keep in mind at which level it should occur. A common mistake is programming the event procedure in the wrong location. The Visual Basic Editor window displays all open projects, arranging all components in a collapsible list, as shown in Figure 12-1. Ensure you have the correct object active before programming your event procedure.
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Figure 12-1.
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The components for each VBA Project are displayed in an expandable list.
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Enabling and Disabling Events
The Excel Application object has an EnableEvents property that you can use to enable or disable event triggers. Because VBA code, including event procedures, can cause events to be trig gered, you might find situations where you will be required to disable events. For example, changing a cell s value from VBA will trigger the Change events in all object levels. If you have code in the Worksheet_Change event procedure that modifies another cell, you must disable events to prevent Worksheet_Change from calling itself repeatedly. If the procedure continu ally called itself, Excel would either overflow its call stack (an internal record of the pending jobs within Excel) or run out of memory. By default all events are enabled. To disable all events, add the following line of code to your VBA procedure:
Application.EnableEvents = False
Part 4: Advanced VBA
12
To enable the events, use this line of code:
Application.EnableEvents = True
Understanding and Using Events Note This setting is for the entire Excel application, so setting it to False will affect all your open workbooks, not just the active workbook containing the code. Also, remember that Excel doesn t restore the setting when your code ends, so be sure to set it back to True to reactivate the events. The primary reason to disable events is to prevent an infinite loop of continuous events. For example, let s say you have developed a timesheet and the maximum number of hours an employee is allowed to work is 40 hours per week. You can write the code to validate the cell contents whenever data is entered into the cell containing the total hours of work for each employee. In this example, you would monitor the Change event for the worksheet using a procedure named Worksheet_Change. Your procedure would check the user s entry to verify that it is less than 40. If the entry exceeds 40, the procedure will display a message informing the user that he or she has exceeded the allowed hours of work and then clear the entry in the cell. The problem with this scenario is that when the cell contents are cleared, the VBA code generates a new Change event, so the event is executed again. This is not what you want to happen, so you need to disable events before you clear the cell, and then reactivate the events so that you can monitor the next user entry. The following Worksheet_Change event displays the required code to validate the users input in a range named Hours. For this example you can replace the range name Hours with a specific cell address to test this code in any workbook. Because this Event procedure refers to the worksheet level, the code needs to be added to the module of the worksheet that you want to trigger the Change event.
Private Sub Worksheet_Change(ByVal Target As Excel.Range) Dim VRange As Range Set VRange = Range("Hours") If Intersect(Target, VRange).Value > 40 Then MsgBox "The weekly hours cannot exceed 40." Application.EnableEvents = False ActiveCell.Value = "" Application.EnableEvents = True End If End Sub
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