Refactored web-app

remoting/webapp/me2mom/util.js

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview
+ * Simple utility functions for Chromoting.
+ */
+
+/**
+ * @param {string} classes A space-separated list of classes.
+ * @param {string} cls The class to check for.
+ * @return {boolean} True if |cls| is found within |classes|.
+ */
+function hasClass(classes, cls) {
+  return classes.match(new RegExp('(\\s|^)' + cls + '(\\s|$)')) != null;
+}
+
+/**
+ * @param {Element} element The element to which to add the class.
+ * @param {string} cls The new class.
+ * @return {void} Nothing.
+ */
+function addClass(element, cls) {
+  if (!hasClass(element.className, cls)) {
+    var padded = element.className == '' ? '' : element.className + ' ';
+    element.className = padded + cls;
+  }
+}
+
+/**
+ * @param {Element} element The element from which to remove the class.
+ * @param {string} cls The new class.
+ * @return {void} Nothing.
+ */
+function removeClass(element, cls) {
+  element.className =
+      element.className.replace(new RegExp('\\b' + cls + '\\b', 'g'), '')
+                       .replace('  ', ' ');
+}