"hasEventListener" is a (about 2kB minified and 1kB gzipped) jQuery plugin which checks if an Object or a DOM element actually has a particular/live/delegated event listener bound to it.
As a bonus, "hasEventListener" also exposes two new jQuery methods called "getEventsData" whose can be used as a 1.2.3+ compatible way to get events data internally stored on an element by jQuery (please, see related examples and API/documentation).