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121 Zeilen
2.3 KiB
121 Zeilen
2.3 KiB
var domEach = require('../utils').domEach,
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_ = {
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pick: require('lodash.pick'),
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};
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var toString = Object.prototype.toString;
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/**
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* Set / Get css.
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*
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* @param {String|Object} prop
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* @param {String} val
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* @return {self}
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* @api public
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*/
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exports.css = function(prop, val) {
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if (arguments.length === 2 ||
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// When `prop` is a "plain" object
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(toString.call(prop) === '[object Object]')) {
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return domEach(this, function(idx, el) {
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setCss(el, prop, val, idx);
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});
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} else {
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return getCss(this[0], prop);
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}
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};
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/**
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* Set styles of all elements.
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*
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* @param {String|Object} prop
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* @param {String} val
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* @param {Number} idx - optional index within the selection
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* @return {self}
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* @api private
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*/
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function setCss(el, prop, val, idx) {
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if ('string' == typeof prop) {
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var styles = getCss(el);
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if (typeof val === 'function') {
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val = val.call(el, idx, styles[prop]);
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}
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if (val === '') {
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delete styles[prop];
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} else if (val != null) {
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styles[prop] = val;
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}
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el.attribs.style = stringify(styles);
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} else if ('object' == typeof prop) {
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Object.keys(prop).forEach(function(k){
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setCss(el, k, prop[k]);
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});
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}
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}
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/**
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* Get parsed styles of the first element.
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*
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* @param {String} prop
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* @return {Object}
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* @api private
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*/
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function getCss(el, prop) {
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var styles = parse(el.attribs.style);
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if (typeof prop === 'string') {
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return styles[prop];
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} else if (Array.isArray(prop)) {
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return _.pick(styles, prop);
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} else {
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return styles;
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}
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}
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/**
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* Stringify `obj` to styles.
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*
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* @param {Object} obj
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* @return {Object}
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* @api private
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*/
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function stringify(obj) {
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return Object.keys(obj || {})
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.reduce(function(str, prop){
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return str += ''
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+ (str ? ' ' : '')
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+ prop
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+ ': '
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+ obj[prop]
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+ ';';
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}, '');
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}
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/**
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* Parse `styles`.
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*
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* @param {String} styles
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* @return {Object}
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* @api private
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*/
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function parse(styles) {
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styles = (styles || '').trim();
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if (!styles) return {};
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return styles
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.split(';')
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.reduce(function(obj, str){
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var n = str.indexOf(':');
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// skip if there is no :, or if it is the first/last character
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if (n < 1 || n === str.length-1) return obj;
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obj[str.slice(0,n).trim()] = str.slice(n+1).trim();
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return obj;
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}, {});
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}
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