Separate initialize, update and destroy functions.

src/js/lib/class.js

@@ -35,3 +35,11 @@ exports.remove = function (element, className) {
     oldRemove(element, className);
   }
 };
+
+exports.list = function (element) {
+  if (element.classList) {
+    return element.classList;
+  } else {
+    return element.className.split(' ');
+  }
+};

src/js/lib/guid.js

@@ -0,0 +1,16 @@
+/* Copyright (c) 2015 Hyunje Alex Jun and other contributors
+ * Licensed under the MIT License
+ */
+'use strict';
+
+module.exports = (function() {
+  function s4() {
+    return Math.floor((1 + Math.random()) * 0x10000)
+               .toString(16)
+               .substring(1);
+  }
+  return function() {
+    return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
+           s4() + '-' + s4() + s4() + s4();
+  };
+})();

src/js/lib/helper.js

@@ -3,7 +3,8 @@
  */
 'use strict';
 
-var d = require('./dom');
+var cls = require('./class')
+  , d = require('./dom');
 
 exports.toInt = function (x) {
   if (typeof x === 'string') {
@@ -42,6 +43,16 @@ exports.isEditable = function (el) {
          d.matches(el, "button,[contenteditable]");
 };
 
+exports.removePsClass = function (element) {
+  var clsList = cls.list(element);
+  for (var i = 0; i < clsList.length; i++) {
+    var className = clsList[i];
+    if (className.indexOf('ps-') === 0) {
+      cls.remove(className);
+    }
+  }
+};
+
 exports.env = {
   isWebKit: 'WebkitAppearance' in document.documentElement.style,
   supportsTouch: (('ontouchstart' in window) || window.DocumentTouch && document instanceof window.DocumentTouch),