However I disagree update while typing should be on, as then the user would be displayed error message while typing. The best way to actually do it would be to 1) update the state of the Ok button while typing but 2) update the error message on control unfocus or large enough typing delay, say a few seconds. This would guarantee that the error message would not be displayed the user who is correctly typing in an IP address. An application should never distract the user as long the user is on correct track. Displaying an error while user is correctly typing in an IP address would be distracting.

Does anyone has an idea how to cleanly implement “onUnfocus” and “onStopTyping” events in LabVIEW? If you have ideas, please post your code to the discussion forum thread.

Just two small remarks:
- Update Value while Typing should be turned on for input string (seems to be turned off in the given example).
- Example with IP incompleted (because allowed addresses like 999.0.0.1). Of course, this is just illustration for the idea, but check should be more robust.

But in general the idea is correct.

Andrey.