Get CanJS Control from DOM elements

gistfile1.js

function handlers($el) {
   $el = $($el);
   var events = $._data(document.body).events;
   var matched_handlers = [];
   Object.keys(events).forEach(function(event_type) {
      var handlers = events[event_type].filter(function (handler) {
         if (!handler.selector) { return false; }
         return $el.is(handler.selector) || $el.has(handler.selector).length;
      });
      matched_handlers = matched_handlers.concat(handlers)
   });
   return matched_handlers;
}

function controls_for_handler(handler) {
   return $(document.body).controls().filter(function (control) {
      var actions = control.constructor.actions;
      var action = handler.selector + ' ' + handler.origType;
      return actions[action];
   });
}

var obs = new MutationObserver(function(mutations) {
   mutations.forEach(function (mutation) {
      [].forEach.call(mutation.addedNodes, function (node) {
         var h = handlers(node);
         if (!h.length) {
            return;
         }
         var controls = [];
         h.forEach(function (handler) {
            controls = controls.concat(controls_for_handler(handler));
         });
         controls = controls.reduce(function (prev, current, i, arr) {
console.log(current, prev.indexOf(current), prev);
            if (prev.indexOf(current) === -1) {
               prev.push(current);
            }
            return prev;
         }, []);
         console.log('node has handler(s), control(s)', node, h, controls);
      });
   });
});
obs.observe(document.body, {childList: true})