KeyHook

keyhook.js

(function() {
  var KeyHook = {
    init: function(e) {
      if (e.keyCode == 13) {
        if (!e.target || !e.target.form) return;

        var button;

        if (this.isSubmitButton(e.target)) {
          button = e.target;
        } else {
          button = this.getSubmitButton(e.target.form);
        }

        if (button) {
          var e = document.createEvent('HTMLEvents');

          e.initEvent('click', true, true);

          button.dispatchEvent(e);
        }
      }
    },

    getSubmitButton: function(form) {
      var els = form.querySelectorAll('button, input');

      for (var i = 0; i < els.length; i++) {
        if (this.isSubmitButton(els[i])) return els[i];
      }

      return null;
    },

    isSubmitButton: function(el) {
      var tag = el.tagName.toLowerCase();
      var type = el.getAttribute('type') ? el.getAttribute('type').toLowerCase() : undefined;

      return tag == 'button' && type == 'submit' || tag == 'input' && (type == 'image' || type == 'submit');
    },

    bind: function() {
      var els = document.querySelectorAll('input, button, select');

      for (var x = 0; x < els.length; x++) {
        els[x].addEventListener('keydown', listener, false);
      }
    },

    unbind: function() {
      var els = document.querySelectorAll('input, button, select');

      for (var x = 0; x < els.length; x++) {
        els[x].removeEventListener('keydown', listener, false);
      }
    }
  };

  function listener(e){
    KeyHook.init(e);
  }
	
  KeyHook.bind();
})()