vc-popup/src/utils/dom.js

vue popup components with power position and animation support and back key support as well

import Vue from 'vue'

const isServer = Vue.prototype.$isServer
const SPECIAL_CHARS_REGEXP = /([:\-_]+(.))/g
const MOZ_HACK_REGEXP = /^moz([A-Z])/
const ieVersion = isServer ? 0 : Number(document.documentMode)

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const trim = function (string) {
  return (string || '').replace(/^[\s\uFEFF]+|[\s\uFEFF]+$/g, '')
}
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const camelCase = function (name) {
  return name.replace(SPECIAL_CHARS_REGEXP, function (_, separator, letter, offset) {
    return offset ? letter.toUpperCase() : letter
  }).replace(MOZ_HACK_REGEXP, 'Moz$1')
}

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export const on = (function () {
  if (!isServer && document.addEventListener) {
    return function (element, event, handler) {
      if (element && event && handler) {
        element.addEventListener(event, handler, false)
      }
    }
  } else {
    return function (element, event, handler) {
      if (element && event && handler) {
        element.attachEvent('on' + event, handler)
      }
    }
  }
})()

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export const off = (function () {
  if (!isServer && document.removeEventListener) {
    return function (element, event, handler) {
      if (element && event) {
        element.removeEventListener(event, handler, false)
      }
    }
  } else {
    return function (element, event, handler) {
      if (element && event) {
        element.detachEvent('on' + event, handler)
      }
    }
  }
})()

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export const once = function (el, event, fn) {
  var listener = function () {
    if (fn) {
      fn.apply(this, arguments)
    }
    off(el, event, listener)
  }
  on(el, event, listener)
}

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export function hasClass (el, cls) {
  if (!el || !cls) return false
  if (cls.indexOf(' ') !== -1) throw new Error('className should not contain space.')
  if (el.classList) {
    return el.classList.contains(cls)
  } else {
    return (' ' + el.className + ' ').indexOf(' ' + cls + ' ') > -1
  }
};

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export function addClass (el, cls) {
  if (!el) return
  var curClass = el.className
  var classes = (cls || '').split(' ')

  for (var i = 0, j = classes.length; i < j; i++) {
    var clsName = classes[i]
    if (!clsName) continue

    if (el.classList) {
      el.classList.add(clsName)
    } else {
      if (!hasClass(el, clsName)) {
        curClass += ' ' + clsName
      }
    }
  }
  if (!el.classList) {
    el.className = curClass
  }
};

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export function removeClass (el, cls) {
  if (!el || !cls) return
  var classes = cls.split(' ')
  var curClass = ' ' + el.className + ' '

  for (var i = 0, j = classes.length; i < j; i++) {
    var clsName = classes[i]
    if (!clsName) continue

    if (el.classList) {
      el.classList.remove(clsName)
    } else {
      if (hasClass(el, clsName)) {
        curClass = curClass.replace(' ' + clsName + ' ', ' ')
      }
    }
  }
  if (!el.classList) {
    el.className = trim(curClass)
  }
};

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export const getStyle = ieVersion < 9 ? function (element, styleName) {
  if (isServer) return
  if (!element || !styleName) return null
  styleName = camelCase(styleName)
  if (styleName === 'float') {
    styleName = 'styleFloat'
  }
  try {
    switch (styleName) {
      case 'opacity':
        try {
          return element.filters.item('alpha').opacity / 100
        } catch (e) {
          return 1.0
        }
      default:
        return (element.style[styleName] || element.currentStyle ? element.currentStyle[styleName] : null)
    }
  } catch (e) {
    return element.style[styleName]
  }
} : function (element, styleName) {
  if (isServer) return
  if (!element || !styleName) return null
  styleName = camelCase(styleName)
  if (styleName === 'float') {
    styleName = 'cssFloat'
  }
  try {
    var computed = document.defaultView.getComputedStyle(element, '')
    return element.style[styleName] || computed ? computed[styleName] : null
  } catch (e) {
    return element.style[styleName]
  }
}

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export function setStyle (element, styleName, value) {
  if (!element || !styleName) return

  if (typeof styleName === 'object') {
    for (var prop in styleName) {
      if (styleName.hasOwnProperty(prop)) {
        setStyle(element, prop, styleName[prop])
      }
    }
  } else {
    styleName = camelCase(styleName)
    if (styleName === 'opacity' && ieVersion < 9) {
      element.style.filter = isNaN(value) ? '' : 'alpha(opacity=' + value * 100 + ')'
    } else {
      element.style[styleName] = value
    }
  }
};