event_debug_helpers.js

Event.allHandlers = function(eventName){
  return $H(Element.Storage).inject([], function(m, p){
    var registry;

    if (!p.value.get || !(registry = p.value.get('prototype_event_registry'))){
      return m;
    }

    if (!eventName){
      return m.concat(registry.values().flatten().pluck('handler'));
    }

    if (registry.get(eventName)){
      return m.concat(registry.get(eventName).pluck('handler'));
    }

    return m;
  });
};

Element.addMethods({
  allHandlers: function(element, eventName){
    var registry = Element.retrive(element, 'prototype_event_registry');

    if (!registry){
      return null;
    }

    if (!eventName){
      return registry.inject({}, function(m, p){
        m[p.key] = p.value.pluck('handler');
        return m;
      });
    }

    return registry.get(eventName).pluck('handler');
  }
});