Mixed checkboxes in LabVIEW can display a TRUE, FALSE, or MIXED value. Use mixed checkboxes to convey the selection status of a set of selectable options.

Mixed checkboxes are available only from the Controls » System palette.

To create and configure a mixed checkbox, complete the following steps.

  1. Add a mixed checkbox to the front panel window from the System palette.
  2. Configure settings for the mixed checkbox: right-click the control and select Properties.
    On the Appearance page, you can configure the enabled state; strings that LabVIEW displays when the value of the control is on, off, or mixed; and so on.
  3. Optional: To prevent a user from setting the MIXED value of a mixed checkbox directly, do either of the following:
    • Interactive: Right-click the control and select Allow Mixed.
    • Programmatic: Use the Allow Mixed.
    When you remove the checkmark from Allow Mixed, LabVIEW can assign the value of the mixed checkbox as MIXED based on the block diagram logic, but you cannot operate to MIXED by clicking on it.

Mixed Checkbox Example

For an example that demonstrates the MIXED value of a mixed checkbox, refer to the System Mixed Checkbox VI in the labview\examples\Controls and Indicators\Boolean directory.