What does the boolean returnvalue of onFocusLost mean?

Classic Servoy
1

When creating an onFocusLost event, the following header is generated:

/**
 * Handle focus element loosing focus.
 *
 * @param {JSEvent} event the event that triggered the action
 *
 * @returns {Boolean}
 *
 * @properties={typeid:24,uuid:"CECF72E1-908F-491D-9E9D-F826BA65175E"}
 */

As you can see it returns a boolean. But what is the difference between a true and a false returnvalue?
I don’t find anything about this returnvalue on the Wiki pages

2

I’d say a false will prevent that the user can leave the field…

3

no don’t think it is used for that (thats ondatachange)

You can have multiply focuslost events (one on the field and one on the forum level) and if you return false on the form level variant then the element focus lost will not be executed