Executes as a page closes and before the OnClosePage Trigger executes.
true to close the page; otherwise false. This value is checked after each function call.
If the page that is closing and all its child pages return true in the OnQueryClosePage trigger, then the OnClosePage Trigger is called for all child pages and then for the parent page.
If an error occurs in the OnQueryClosePage trigger or it returns false, then the page is not closed.
You can use this trigger to write to the database.