This article was previously published under Q213760
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.
By default, Microsoft Excel 2000 allows you to set the value of a CheckBox control to True or False. A True value indicates that the CheckBox control is selected. A False value indicates that the CheckBox control is cleared.
You can also set a CheckBox control to a third value called Null.
NOTE: Before you can set the Null value, you must set the TripleState property of a CheckBox control to True.
NOTE: 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.
If you set a CheckBox control to Null, it appears shaded.
When you set the value of a CheckBox control to Null, the Click event for the check box is not run. If you want to check for a Null value when you click a CheckBox control, use the Change event.
Microsoft Visual Basic for Applications Macro Example
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Close and save any open workbooks, and then open a new workbook.
Start the Visual Basic Editor (press ALT+F11).
If the Properties window is not visible, click Properties on the View menu (or press F4).
On the Insert menu, click UserForm.
Draw a CheckBox control on the UserForm.
Activate the Properties window (press F4).
Change the value of the TripleState property to True.
Draw a Label control on the UserForm.
Double-click the CheckBox control to display the Code window for the UserForm.
Click Change in the Procedure list.
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 SelectEnd Sub
Run the UserForm.
When you click the CheckBox control, the value of the label changes. When you are finished, close the UserForm.
For more information about CheckBoxes, in the Visual Basic Editor, click Microsoft Visual Basic Help on the Help menu, type checkbox in the Office Assistant or the Answer Wizard, and then click Search to view the topic.
For more information about the TripleState property, in the Visual Basic Editor, click Microsoft Visual Basic Help on the Help menu, type triplestate in the Office Assistant or the Answer Wizard, and then click Search to view the topic.