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108 lines
3.6 KiB
108 lines
3.6 KiB
/** |
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* Copyright 2013-2015, Facebook, Inc. |
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* All rights reserved. |
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* |
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* This source code is licensed under the BSD-style license found in the |
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* LICENSE file in the root directory of this source tree. An additional grant |
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* of patent rights can be found in the PATENTS file in the same directory. |
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* |
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* @providesModule CSSCore |
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* @typechecks |
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*/ |
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var invariant = require("./invariant"); |
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/** |
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* The CSSCore module specifies the API (and implements most of the methods) |
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* that should be used when dealing with the display of elements (via their |
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* CSS classes and visibility on screen. It is an API focused on mutating the |
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* display and not reading it as no logical state should be encoded in the |
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* display of elements. |
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*/ |
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var CSSCore = { |
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/** |
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* Adds the class passed in to the element if it doesn't already have it. |
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* |
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* @param {DOMElement} element the element to set the class on |
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* @param {string} className the CSS className |
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* @return {DOMElement} the element passed in |
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*/ |
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addClass: function(element, className) { |
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("production" !== process.env.NODE_ENV ? invariant( |
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!/\s/.test(className), |
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'CSSCore.addClass takes only a single class name. "%s" contains ' + |
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'multiple classes.', className |
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) : invariant(!/\s/.test(className))); |
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if (className) { |
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if (element.classList) { |
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element.classList.add(className); |
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} else if (!CSSCore.hasClass(element, className)) { |
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element.className = element.className + ' ' + className; |
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} |
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} |
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return element; |
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}, |
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/** |
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* Removes the class passed in from the element |
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* |
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* @param {DOMElement} element the element to set the class on |
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* @param {string} className the CSS className |
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* @return {DOMElement} the element passed in |
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*/ |
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removeClass: function(element, className) { |
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("production" !== process.env.NODE_ENV ? invariant( |
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!/\s/.test(className), |
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'CSSCore.removeClass takes only a single class name. "%s" contains ' + |
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'multiple classes.', className |
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) : invariant(!/\s/.test(className))); |
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if (className) { |
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if (element.classList) { |
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element.classList.remove(className); |
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} else if (CSSCore.hasClass(element, className)) { |
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element.className = element.className |
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.replace(new RegExp('(^|\\s)' + className + '(?:\\s|$)', 'g'), '$1') |
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.replace(/\s+/g, ' ') // multiple spaces to one |
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.replace(/^\s*|\s*$/g, ''); // trim the ends |
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} |
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} |
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return element; |
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}, |
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/** |
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* Helper to add or remove a class from an element based on a condition. |
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* |
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* @param {DOMElement} element the element to set the class on |
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* @param {string} className the CSS className |
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* @param {*} bool condition to whether to add or remove the class |
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* @return {DOMElement} the element passed in |
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*/ |
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conditionClass: function(element, className, bool) { |
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return (bool ? CSSCore.addClass : CSSCore.removeClass)(element, className); |
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}, |
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/** |
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* Tests whether the element has the class specified. |
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* |
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* @param {DOMNode|DOMWindow} element the element to set the class on |
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* @param {string} className the CSS className |
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* @return {boolean} true if the element has the class, false if not |
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*/ |
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hasClass: function(element, className) { |
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("production" !== process.env.NODE_ENV ? invariant( |
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!/\s/.test(className), |
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'CSS.hasClass takes only a single class name.' |
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) : invariant(!/\s/.test(className))); |
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if (element.classList) { |
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return !!className && element.classList.contains(className); |
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} |
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return (' ' + element.className + ' ').indexOf(' ' + className + ' ') > -1; |
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} |
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}; |
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module.exports = CSSCore;
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