extensions to HTMLDocument for setting up click and keypress events

gistfile1.js

//Helper extension for setting up document.on('click') and document.on('keypress') if escape...
//I think it's pretty stupid code, inspired by having eaten absolutely too much, watcha gonna do.

//usage:
//  document.on('escape', hide);
//  document.on('click', hide);

(function(){
  var events = {'escape': [], 'click': [], 'enter': []};

  HTMLDocument.prototype.on = function(e, callback) {
    events[e].push(callback);
    if (events[e].length > 1) { return; }
    if (e == 'escape') { return setupOnKeyPress('escape', 27); }
    if (e == 'enter') { return setupOnKeyPress('enter', 13); }
    if (e == 'click') { return setupOnClick(); }
  }
  function setupOnKeyPress(name, code) {
    $(document).on('keydown', function(e) {
      if (e.keyCode != code) { return }
      fireEvents(name);
    });
    return true;
  }

  function setupOnClick() {
    $(document).on('click', function() {
      fireEvents('click');
    });
    return true;
  }

  function fireEvents(name) {
    for(var i = 0; i < events[name].length; ++i) {
      events[name][i]();
    }
  }
})();