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63 lines
1.4 KiB
63 lines
1.4 KiB
/* @flow */
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const whitespaceRE = /\s+/
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/**
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* Add class with compatibility for SVG since classList is not supported on
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* SVG elements in IE
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*/
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export function addClass (el: HTMLElement, cls: ?string) {
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/* istanbul ignore if */
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if (!cls || !(cls = cls.trim())) {
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return
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}
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/* istanbul ignore else */
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if (el.classList) {
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if (cls.indexOf(' ') > -1) {
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cls.split(whitespaceRE).forEach(c => el.classList.add(c))
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} else {
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el.classList.add(cls)
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}
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} else {
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const cur = ` ${el.getAttribute('class') || ''} `
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if (cur.indexOf(' ' + cls + ' ') < 0) {
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el.setAttribute('class', (cur + cls).trim())
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}
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}
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}
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/**
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* Remove class with compatibility for SVG since classList is not supported on
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* SVG elements in IE
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*/
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export function removeClass (el: HTMLElement, cls: ?string) {
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/* istanbul ignore if */
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if (!cls || !(cls = cls.trim())) {
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return
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}
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/* istanbul ignore else */
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if (el.classList) {
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if (cls.indexOf(' ') > -1) {
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cls.split(whitespaceRE).forEach(c => el.classList.remove(c))
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} else {
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el.classList.remove(cls)
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}
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if (!el.classList.length) {
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el.removeAttribute('class')
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}
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} else {
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let cur = ` ${el.getAttribute('class') || ''} `
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const tar = ' ' + cls + ' '
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while (cur.indexOf(tar) >= 0) {
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cur = cur.replace(tar, ' ')
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}
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cur = cur.trim()
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if (cur) {
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el.setAttribute('class', cur)
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} else {
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el.removeAttribute('class')
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}
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}
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}
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