81 lines
2.3 KiB
JavaScript
81 lines
2.3 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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/* Copyright 2012 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/** @license Copyright 2012 Mozilla Foundation
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* Copyright 2013 Lu Wang <coolwanglu@gmail.com>
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* Apache License Version 2.0
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*/
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'use strict';
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// HTMLElement classList property
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(function checkClassListProperty() {
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var div = document.createElement('div');
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if ('classList' in div)
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return; // classList property exists
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function changeList(element, itemName, add, remove) {
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var s = element.className || '';
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var list = s.split(/\s+/g);
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if (list[0] === '') list.shift();
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var index = list.indexOf(itemName);
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if (index < 0 && add)
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list.push(itemName);
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if (index >= 0 && remove)
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list.splice(index, 1);
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element.className = list.join(' ');
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return (index >= 0);
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}
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var classListPrototype = {
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add: function(name) {
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changeList(this.element, name, true, false);
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},
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contains: function(name) {
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return changeList(this.element, name, false, false);
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},
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remove: function(name) {
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changeList(this.element, name, false, true);
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},
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toggle: function(name) {
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changeList(this.element, name, true, true);
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}
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};
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Object.defineProperty(HTMLElement.prototype, 'classList', {
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get: function() {
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if (this['_classList'])
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return this['_classList'];
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var classList = Object.create(classListPrototype, {
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element: {
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value: this,
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writable: false,
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enumerable: true
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}
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});
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Object.defineProperty(this, '_classList', {
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value: classList,
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writable: false,
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enumerable: false
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});
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return classList;
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},
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enumerable: true
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});
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})();
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