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

ID: Q161326

The information in this article applies to:

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

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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

 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.

When you click the CheckBox control, the value of the label changes. When you are finished, close the UserForm.

REFERENCES

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

   check
and then double-click the selected text to go to the "CheckBox control" topic.

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

   triple
and then double-click the selected text to go to the "TripleState Property" topic.

Additional query words: XL97 

Keywords          : kbprg kbdta kbdtacode KbVBA 
Version           : WINDOWS:97
Platform          : WINDOWS

Last Reviewed: May 18, 1999