XL98: How to Verify the Value of a CheckBox on a UserForm

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CheckBox Behavior

By default, Microsoft Excel 98 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 programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements. To use this example, follow these steps:

1. Close and save any open workbooks, and then create a new workbook.
2. Start the Visual Basic Editor (press OPTION+F11).
3. On the Insert menu, click UserForm.
4. Draw a CheckBox control on the UserForm.
5. Switch to the Properties window (press F6).
6. Change the value of the TripleState property to True.
7. Draw a Label control on the UserForm.
8. Double-click the CheckBox to display the Code window for the UserForm.
9. Click Change in the Procedure list.
10. 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
    						

11. Run the UserForm.

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