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The Object Browser
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You can view the various types of objects, methods, and properties available to Excel by switching to the VBE. To do so, select Tools, Macro, Visual Basic Editor (or press Alt+F11). Then choose View, Object Browser (or press F2). The window displayed on the right of the screen shown in Figure 31-6 appears. Select Excel from the dropdown list of libraries at the top of the Object Browser screen.
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Figure 31-6. The Object Browser shows the classes of objects that belong to the Excel application.
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On the left is a list of the various classes of objects available to Excel. You can think of a class as a template or description for a type of object; a specific chart, for example, would be an object that is an instance of the Chart class. In VBA, classes belong to a project or library. As shown in Figure 31-6, the Object Browser lists the object classes belonging to the library Excel. If you scroll down the classes and select a class the Range class, for example the right side of the Object Browser lists the properties and methods (called the members of the class) that belong to that object. Figure 31-7 shows the members of the Range class.
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Figure 31-7. Here the Object Browser shows the Range object and some of the Range object s methods and properties.
Collections of Objects
You can have more than one instance of the same VBA object. Together, such instances comprise a collection. Each instance in a collection of objects can be identified by either its index value (its position within the collection) or its name. For example, the collection of all sheets in a workbook is
Sheets()
and a specific instance of a sheet, the third one in the collection, is
Sheets(3)
If the third sheet were named Summary, it could also be identified as
Sheets("Summary")
Manipulating Collections with For Each In VBA, each item in a collection has its own index, but the index numbers for an entire collection are not necessarily consecutive. If you delete one instance of an object in a collection, the index values of the remaining instances might not be renumbered. For example, if you delete Sheets(3) from a collection of 12 sheets in a workbook, there s no guarantee that Excel will renumber Sheets(4) through Sheets(12) to fill the gap.
Recording Macros In other programming languages, you might use a For Next construction such as the following to repeat an operation many times:
For n = 1 to 12 ' Activate each sheet Sheets(n).Activate Next n Sheets(n).Activate Next n
If you run this code in a VBA macro after deleting Sheets(3), VBA displays an error message and stops the macro because Sheets(3) no longer exists. To allow for nonconsecutive indexes, VBA offers For Each Next, a control structure that applies a series of statements to each item in a collection, regardless of the index numbers. For example, suppose you d like to label each sheet in the active workbook by entering the text Sheet 1, Sheet 2, and so on, in cell A1 of each sheet. As you won t, in general, know how many sheets there are in any given workbook, you might use the following VBA macro:
Sub EnterSheetNum() n = 0 for Each Sheet In Sheets() n = n + 1 Sheet.Activate Range("A1").Select ActiveCell.FormulaR1C1 = "Sheet" + Str(n) Next End Sub
Manipulating an Object s Properties Without Selecting the Object
The code just listed activates each sheet in turn, then selects cell A1 on that sheet, and finally assigns a new value to that cell s FormulaR1C1 property. This sequence of steps mimics the steps that most users would follow if they were working manually. In VBA, everything but the last step in the sequence is unnecessary. That is, you can replace the following instructions:
Sheet.Activate Range("A1").Select ActiveCell.FormulaR1C1 = "Sheet" + Str(n)
with a single instruction:
Sheet.Range("A1").FormulaR1C1 = "Sheet" + Str(n)
The benefit of this change is that it enables the macro to run faster because Excel is no longer required to activate sheets and select cells.
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