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polyfill.js 5.03 KiB
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import Util from '../util'
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/**
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 * --------------------------------------------------------------------------
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 * Bootstrap (v4.1.3): dom/polyfill.js
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 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
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 * --------------------------------------------------------------------------
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 */
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/* istanbul ignore next */
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const Polyfill = (() => {
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  // defaultPrevented is broken in IE
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  const workingDefaultPrevented = (() => {
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    const e = document.createEvent('CustomEvent')
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    e.initEvent('Bootstrap', true, true)
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    e.preventDefault()
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    return e.defaultPrevented
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  })()
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  if (!workingDefaultPrevented) {
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    const origPreventDefault = Event.prototype.preventDefault
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    Event.prototype.preventDefault = function () {
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      if (!this.cancelable) {
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        return
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      }
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      origPreventDefault.call(this)
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      Object.defineProperty(this, 'defaultPrevented', {
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        get() {
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          return true
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        },
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        configurable: true
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      })
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    }
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  }
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  // CustomEvent polyfill for IE (see: https://mzl.la/2v76Zvn)
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  if (typeof window.CustomEvent !== 'function') {
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    window.CustomEvent = (event, params) => {
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      params = params || {
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        bubbles: false,
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        cancelable: false,
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        detail: null
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      }
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      const evt = document.createEvent('CustomEvent')
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      evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail)
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      return evt
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    }
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    window.CustomEvent.prototype = window.Event.prototype
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  }
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  // MSEdge resets defaultPrevented flag upon dispatchEvent call if at least one listener is attached
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  const defaultPreventedPreservedOnDispatch = (() => {
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    const e = new CustomEvent('Bootstrap', {
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      cancelable: true
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    })
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    const element = document.createElement('div')
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    element.addEventListener('Bootstrap', () => null)
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    e.preventDefault()
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    element.dispatchEvent(e)
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    return e.defaultPrevented
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  })()
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  // Event constructor shim
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  if (!window.Event || typeof window.Event !== 'function') {
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    const origEvent = window.Event
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    window.Event = (inType, params) => {
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params = params || {} const e = document.createEvent('Event') e.initEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable)) return e } window.Event.prototype = origEvent.prototype } // matches polyfill (see: https://mzl.la/2ikXneG) if (!Element.prototype.matches) { Element.prototype.matches = Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector } // closest polyfill (see: https://mzl.la/2vXggaI) let closest if (!Element.prototype.closest) { closest = (element, selector) => { let ancestor = element do { if (ancestor.matches(selector)) { return ancestor } ancestor = ancestor.parentElement } while (ancestor !== null && ancestor.nodeType === Node.ELEMENT_NODE) return null } } else { closest = (element, selector) => element.closest(selector) } const supportScopeQuery = (() => { const element = document.createElement('div') try { element.querySelectorAll(':scope *') } catch (e) { return false } return true })() const scopeSelectorRegex = /:scope\b/ let find = Element.prototype.querySelectorAll let findOne = Element.prototype.querySelector if (!supportScopeQuery) { find = function (selector) { if (!scopeSelectorRegex.test(selector)) { return this.querySelectorAll(selector) } const hasId = Boolean(this.id) if (!hasId) { this.id = Util.getUID('scope') } let nodeList = null try { selector = selector.replace(scopeSelectorRegex, `#${this.id}`) nodeList = this.querySelectorAll(selector) } finally { if (!hasId) { this.removeAttribute('id') } }
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return nodeList } findOne = function (selector) { if (!scopeSelectorRegex.test(selector)) { return this.querySelector(selector) } const matches = find.call(this, selector) if (typeof matches[0] !== 'undefined') { return matches[0] } return null } } if (typeof Object.assign !== 'function') { Object.defineProperty(Object, 'assign', { value: (target, ...args) => { if (target === null || typeof target === 'undefined') { throw new TypeError('Cannot convert undefined or null to object') } const to = Object(target) for (let index = 1; index < args.length; index++) { const nextSource = args[index] if (nextSource !== null || !nextSource) { for (const nextKey in nextSource) { if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) { to[nextKey] = nextSource[nextKey] } } } } return to }, writable: true, configurable: true }) } return { defaultPreventedPreservedOnDispatch, focusIn: typeof window.onfocusin === 'undefined', closest, find, findOne } })() export default Polyfill