XL97: How to Verify the Value of a CheckBox on a UserForm

• Microsoft Excel 97 for Windows

SUMMARY

In Microsoft Excel, a CheckBox control on a UserForm can have one of three values: True, False or Null. This article contains a sample macro that programmatically retrieves the value of a CheckBox control.

MORE INFORMATION

CheckBox Behavior

By default, Microsoft Excel 97 allows you to set the value of a CheckBox control to True or False. A True value indicates that the CheckBox control is selected, False indicates that the CheckBox control is cleared.

You can also set a CheckBox control to a third value called Null. Note that before you can set the Null value, you must set the TripleState property of a CheckBox control to True.

A CheckBox control set to Null is shaded. Note that when you set the TripleState property of a CheckBox control to True, the Value of the check box is set to the following values in the following order: False, Null, and True.

When you set the value of a CheckBox control to Null, the Click event for the check box is not executed. If you want to check for a Null value when you click a CheckBox control, use the Change event.

Visual Basic for Applications Macro Example

Microsoft provides examples of Visual Basic for Applications procedures for illustration only, without warranty either expressed or implied, including, but not limited to the implied warranties of merchantability and/or fitness for a particular purpose. The Visual Basic procedures in this article are provided 'as is' and Microsoft does not guarantee that they can be used in all situations. While Microsoft support engineers can help explain the functionality of a particular macro, they will not modify these examples to provide added functionality, nor will they help you construct macros to meet your specific needs. If you have limited programming experience, you may want to consult one of the Microsoft Solution Providers. Solution Providers offer a wide range of fee-based services, including creating custom macros. For more information about Microsoft Solution Providers, call Microsoft Customer Information Service at (800) 426-9400.

1. Close and save any open workbooks, and then open a new workbook.

2. Start the Visual Basic Editor (press ALT+F11).

3. If the Properties window is not visible, click Properties on the View menu (or press F4).

4. On the Insert menu, click UserForm.

5. Draw a CheckBox control on the UserForm.

6. Activate the Properties window (press F4).

7. Change the value of the TripleState property to True.

8. Draw a Label control on the UserForm.

9. Double-click the CheckBox to display the Code window for the UserForm.

10. Click Change in the Procedure list.

11. In the module, type the following code for the CheckBox1 Change event:

    Private Sub CheckBox1_Change()

               'Evaluate the value of the CheckBox
               Select Case CheckBox1.Value
                   Case True, False
    
                       'Set the caption of the Label to the value of the 
                       'CheckBox.
                       Label1.Caption = CheckBox1.Value
    
                   Case Else
                       'If Null, set the Label's caption appropriately.
                       Label1.Caption = "Null"
    
               End Select
    
           End Sub
    
    

12. Run the UserForm.

REFERENCES

For more information about CheckBoxes, click the Index tab in Visual Basic for Applications Help, type the following text

   check

For more information about the TripleState property, click the Index tab in Visual Basic for Applications Help, type the following text

   triple