119 lines
4.3 KiB
JavaScript
119 lines
4.3 KiB
JavaScript
'use strict';
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/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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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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/* Slow implementation for browsers that don't natively support .matches() */
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function matchesSelector_SLOW(element, selector) {
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var root = element;
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while (root.parentNode) {
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root = root.parentNode;
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}
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var all = root.querySelectorAll(selector);
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return Array.prototype.indexOf.call(all, element) !== -1;
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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 addClass(element, className) {
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!!/\s/.test(className) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'CSSCore.addClass takes only a single class name. "%s" contains ' + 'multiple classes.', className) : invariant(false) : void 0;
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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 removeClass(element, className) {
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!!/\s/.test(className) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'CSSCore.removeClass takes only a single class name. "%s" contains ' + 'multiple classes.', className) : invariant(false) : void 0;
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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.replace(new RegExp('(^|\\s)' + className + '(?:\\s|$)', 'g'), '$1').replace(/\s+/g, ' ') // multiple spaces to one
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.replace(/^\s*|\s*$/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 conditionClass(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 check 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 hasClass(element, className) {
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!!/\s/.test(className) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'CSS.hasClass takes only a single class name.') : invariant(false) : void 0;
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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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* Tests whether the element matches the selector specified
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*
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* @param {DOMNode|DOMWindow} element the element that we are querying
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* @param {string} selector the CSS selector
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* @return {boolean} true if the element matches the selector, false if not
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*/
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matchesSelector: function matchesSelector(element, selector) {
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var matchesImpl = element.matches || element.webkitMatchesSelector || element.mozMatchesSelector || element.msMatchesSelector || function (s) {
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return matchesSelector_SLOW(element, s);
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};
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return matchesImpl.call(element, selector);
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}
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};
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module.exports = CSSCore; |