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Your application may rely on various events running when they should. Consider, for example, the following code: Do the same for the Workbook and Application objects. Name End Sub Order Of Events If you have event code in the sheet, the workbook, and the application classes, the event will be raised in all three of these objects. Doing so may cause the event not to work. Once you have declared your events, one Public Event declaration for each event , you need raise the event at the appropriate location in your class. Event Hierarchy As noted above, events are generated by: The easiest way to do this is with the Intersect method. Now that the WS object has been set to a specific worksheet, it will respond to events generated by the newly created worksheet. EnableEvents is properly reset to True. This method is about approximately 25 times faster than using the Copy method. Once you decide on a method, stick with that method across projects. You cannot create new events for an Excel object. You can save time and improve performance by using the With statement to perform several actions on a given object in one shot. If you were to copy cell A1 and paste it into cell B1 while recording a macro, the Macro Recorder would capture this: Besides setting the EnableEvents property, there is nothing related to events in a standard code module; every thing is in an object module. VBA will automatically insert the proper procedure shell for that event.
Thus, the counter gets a value of 3, not 1 as you might expect. Preventing Event Loops Without proper coding, your event procedures can end up in infinite recursive loops. The term Superior object refers to an object that is higher up in the hierarchy of event-generating objects. This will add the event procedure declaration for the Change event to the code module, as shown below: You can give your macros a slight boost by cutting out the middle man and performing a direct copy from one cell to a destination cell. Instead, you must use either of the techniques described later for the Application object -- just substitute "As Chart" for "As Application" and set the event class variable to Sheet1. If it is that range, you'll do something. It is important to note that the event procedures of a subordinate object e. Remember, never change the code that VBA inserts for you. If you do change it, it is quite likely that the code will not work properly, if at all. ManualUpdate property to True to defer recalculation, run your macro code, and then set the PivotTable. If you have no compelling reason to put other code in the sheet or ThisWorkbook modules and there are a few quite legitimate reasons to do so, but they are beyond the scope of this article you should put it in a standard code module. As before, do not change the code generated by VBA. Yet again, the Change event runs, changing the 4 to a 5. Since the Worksheet is at the bottom of the hierarchy and has no subordinate objects at least no objects that have events, that have events , so the Worksheet contains only events for itself. It is important to remember that in addition to user input, events may run as the results of actions taken by other VBA code. You should assume the opposite -- the events of the superior object will not yet have run. Introduction Event programming is a very powerful tool that you can use within your VBA code to monitor user actions, take appropriate action when a user does something, or monitor the state of the application as it changes. VBA will automatically insert the proper declarations for that event. You can examine that variable to determine if your code needs to carry out some action or whether it can ignore the change and get out with an Exit Sub statement. Besides setting the EnableEvents property, there is nothing related to events in a standard code module; every thing is in an object module. Creating Your Own Events In Class Modules If you are writing your own class modules see Introduction To Classes for an introduction to working with and creating classes , you may want a class to raise an event when a specified action or condition occurs. On this page, we will cover Application events in only in general terms, but not in much detail since they require a different coding model. This change, however, raises the Change event again and the code will run to change the 2 to a 3. For example, Worksheet is a subordinate object, to both the Workbook and Application object. This will open the VBA Editor to the code module associated with that worksheet. In order to prevent this runaway looping, you can use the EnableEvents property of the Application object.
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