Direct and indirect signalling (a.k.a. channels a.k.a. Signal & Slot a.k.a. publisher/pubscriber model)

Channel.js

var Channel = (function () {
  var channels = {}, PREFIX = 'Channel:';

  return {
    connect: function (id, handler, indirect) {
      indirect = indirect || false;
      if (indirect) {
        window.addEventListener(PREFIX + id, handler, false);
      }
      else {
        if (!channels.hasOwnProperty(id))
          channels[id] = [];
        channels[id].push(handler);
      }
    },
    disconnect: function (id, handler, indirect) {
      indirect = indirect || false;
      if (indirect) {
        window.removeEventListener(PREFIX + id, handler, false);
      }
      else {
        if (channels.hasOwnProperty(id)) {
          channels[id].splice(channels[id].indexOf(handler), 1);
        }
      }
    },
    send: function (id, message) {
      if (channels.hasOwnProperty(id)) {
        channels[id].forEach(function (fn) {
          fn.call(null, {
            detail: message
          });
        });
      }
      else { // id not registered, try to trigger event
        window.dispatchEvent(new CustomEvent(PREFIX + id, {
          detail: message,
          bubbles: false,
          cancalable: false
        }));
      }
    }
  };
})();

// subscribe to channel "foo"
Channel.connect('foo', function(message) {
  var data = message.detail;
  // ...
});

// broadcast message to all subscribers of channel "foo"
Channel.send('foo', { message: data });