How can I know in my triggering code that preventDefault has been called?
preventDefault
$(document).trigger(\'customEvent\', params); if (/* ??? */) doDefault
If you're asking how to find out whether or not the default has been prevented, use:
event.isDefaultPrevented()
This will return 'true' or 'false' based on whether or not preventDefault() was called.
EDIT: http://api.jquery.com/event.isDefaultPrevented/