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jQuery scrollToTop v0.4.3\n* https://github.com/amazingSurge/jquery-scrollToTop\n*\n* Copyright (c) amazingSurge\n* Released under the LGPL-3.0 license\n*/\nimport $ from 'jquery';\n\nvar DEFAULTS = {\n  distance: 200,\n  speed: 1000,\n  easing: 'linear',\n  animation: 'fade', // fade, slide, none\n  animationSpeed: 500,\n\n  mobile: {\n    width: 768,\n    distance: 100,\n    speed: 1000,\n    easing: 'easeInOutElastic',\n    animation: 'slide',\n    animationSpeed: 200\n  },\n\n  trigger: null, // Set a custom triggering element. Can be an HTML string or jQuery object\n  target: null, // Set a custom target element for scrolling to. Can be element or number\n  text: 'Scroll To Top', // Text for element, can contain HTML\n\n  skin: null,\n  throttle: 250,\n\n  namespace: 'scrollToTop'\n};\n\nfunction transition() {\n  let e;\n  let end;\n  let prefix = '';\n  let supported = false;\n  const el = document.createElement(\"fakeelement\");\n\n  const transitions = {\n    \"WebkitTransition\": \"webkitTransitionEnd\",\n    \"MozTransition\": \"transitionend\",\n    \"OTransition\": \"oTransitionend\",\n    \"transition\": \"transitionend\"\n  };\n\n  for (e in transitions) {\n    if (el.style[e] !== undefined) {\n      end = transitions[e];\n      supported = true;\n      break;\n    }\n  }\n  if (/(WebKit)/i.test(window.navigator.userAgent)) {\n    prefix = '-webkit-';\n  }\n  return {\n    prefix,\n    end,\n    supported\n  };\n}\n\nfunction throttle(func, wait) {\n  const _now = Date.now || function() {\n    return new Date().getTime();\n  };\n\n  let timeout;\n  let context;\n  let args;\n  let result;\n  let previous = 0;\n  let later = function() {\n    previous = _now();\n    timeout = null;\n    result = func.apply(context, args);\n    if (!timeout) {\n      context = args = null;\n    }\n  };\n\n  return (...params) => {\n    /*eslint consistent-this: \"off\"*/\n    let now = _now();\n    let remaining = wait - (now - previous);\n    context = this;\n    args = params;\n    if (remaining <= 0 || remaining > wait) {\n      if (timeout) {\n        clearTimeout(timeout);\n        timeout = null;\n      }\n      previous = now;\n      result = func.apply(context, args);\n      if (!timeout) {\n        context = args = null;\n      }\n    } else if (!timeout) {\n      timeout = setTimeout(later, remaining);\n    }\n    return result;\n  };\n}\n\n/**\n * Plugin constructor\n **/\nclass ScrollToTop {\n  constructor(options = {}) {\n    this.$doc = $('body');\n    this.options = $.extend(true, {}, DEFAULTS, options);\n\n    const namespace = this.options.namespace;\n\n    if (this.options.skin === null) {\n      this.options.skin = 'default';\n    }\n\n    this.classes = {\n      skin: `${namespace}_${this.options.skin}`,\n      trigger: namespace,\n      animating: `${namespace}_animating`,\n      show: `${namespace}_show`\n    };\n\n    this.disabled = false;\n    this.useMobile = false;\n    this.isShow = false;\n\n    this._init();\n  }\n\n  _init() {\n    this.transition = transition();\n    this._build();\n\n    if (this.options.target) {\n      if (typeof this.options.target === 'number') {\n        this.target = this.options.target;\n      } else if (typeof this.options.target === 'string') {\n        this.target = Math.floor($(this.options.target).offset().top);\n      }\n    } else {\n      this.target = 0;\n    }\n\n    this._bindEvents();\n\n    this._toggle();\n  }\n\n  _bindEvents() {\n    this.$trigger.on('click.scrollToTop', () => {\n      this.$doc.trigger('ScrollToTop::jump');\n      return false;\n    });\n\n    // bind events\n    this.$doc.on('ScrollToTop::jump', () => {\n      if (this.disabled) {\n        return;\n      }\n\n      this.checkMobile();\n\n      let speed;\n      let easing;\n\n      if (this.useMobile) {\n        speed = this.options.mobile.speed;\n        easing = this.options.mobile.easing;\n      } else {\n        speed = this.options.speed;\n        easing = this.options.easing;\n      }\n\n      this.$doc.addClass(this.classes.animating);\n\n      if (this.transition.supported) {\n        const pos = $(window).scrollTop();\n\n        this.$doc.css({\n          'margin-top': `${-pos + this.target}px`\n        });\n        $(window).scrollTop(this.target);\n\n        this._insertRule(`.duration_${speed}{${this.transition.prefix}transition-duration: ${speed}ms;}`);\n\n        this.$doc.addClass(`easing_${easing} duration_${speed}`).css({\n          'margin-top': ''\n        }).one(this.transition.end, () => {\n          this.$doc.removeClass(`${this.classes.animating} easing_${easing} duration_${speed}`);\n        });\n      } else {\n        $('html, body').stop(true, false).animate({\n          scrollTop: this.target\n        }, speed, () => {\n          this.$doc.removeClass(this.classes.animating);\n        });\n        return;\n      }\n    })\n      .on('ScrollToTop::show', () => {\n        if (this.isShow) {\n          return;\n        }\n        this.isShow = true;\n\n        this.$trigger.addClass(this.classes.show);\n      })\n      .on('ScrollToTop::hide', () => {\n        if (!this.isShow) {\n          return;\n        }\n        this.isShow = false;\n        this.$trigger.removeClass(this.classes.show);\n      })\n      .on('ScrollToTop::disable', () => {\n        this.disabled = true;\n        this.$doc.trigger('ScrollToTop::hide');\n      })\n      .on('ScrollToTop::enable', () => {\n        this.disabled = false;\n        this._toggle();\n      });\n\n    $(window).on('scroll.ScrollToTop', throttle(() => {\n      if (this.disabled) {\n        return;\n      }\n\n      this._toggle();\n    }, this.options.throttle));\n\n    if (this.options.mobile) {\n      $(window).on('resize.ScrollToTop orientationchange.ScrollToTop', throttle(() => {\n        if (this.disabled) {\n          return;\n        }\n\n        this.checkMobile();\n      }, this.options.throttle));\n    }\n  }\n\n  _build() {\n    if (this.options.trigger) {\n      this.$trigger = $(this.options.trigger);\n    } else {\n      this.$trigger = $(`<a href=\"#\" class=\"${this.classes.trigger} ${this.classes.skin}\">${this.options.text}</a>`).appendTo($('body'));\n    }\n\n    this._insertRule(`.${this.classes.show}{${this.transition.prefix}animation-duration: ${this.options.animationSpeed}ms;${this.transition.prefix}animation-name: ${this.options.namespace}_${this.options.animation};}`);\n\n    if (this.options.mobile) {\n      this._insertRule(`@media (max-width: ${this.options.mobile.width}px){.${this.classes.show}{${this.transition.prefix}animation-duration: ${this.options.mobile.animationSpeed}ms !important;${this.transition.prefix}animation-name: ${this.options.namespace}_${this.options.mobile.animation}  !important;}}`);\n    }\n  }\n\n  checkMobile() {\n    const width = $(window).width();\n\n    if (width < this.options.mobile.width) {\n      this.useMobile = true;\n    } else {\n      this.useMobile = false;\n    }\n  }\n\n  can() {\n    let distance;\n    if (this.useMobile) {\n      distance = this.options.mobile.distance;\n    } else {\n      distance = this.options.distance;\n    }\n    if ($(window).scrollTop() > distance) {\n      return true;\n    }\n    return false;\n  }\n\n  _toggle() {\n    if (this.can()) {\n      this.$doc.trigger('ScrollToTop::show');\n    } else {\n      this.$doc.trigger('ScrollToTop::hide');\n    }\n  }\n\n  _insertRule(rule) {\n    if (this.rules && this.rules[rule]) {\n      return;\n    } else if (this.rules === undefined) {\n      this.rules = {};\n    } else {\n      this.rules[rule] = true;\n    }\n\n    if (document.styleSheets && document.styleSheets.length) {\n      document.styleSheets[0].insertRule(rule, 0);\n    } else {\n      const style = document.createElement('style');\n      style.innerHTML = rule;\n      document.head.appendChild(style);\n    }\n  }\n\n  jump() {\n    this.$doc.trigger('ScrollToTop::jump');\n  }\n\n  disable() {\n    this.$doc.trigger('ScrollToTop::disable');\n  }\n\n  enable() {\n    this.$doc.trigger('ScrollToTop::enable');\n  }\n\n  destroy() {\n    this.$trigger.remove();\n    this.$doc.data('ScrollToTop', null);\n    this.$doc.off('ScrollToTop::enable')\n      .off('ScrollToTop::disable')\n      .off('ScrollToTop::jump')\n      .off('ScrollToTop::show')\n      .off('ScrollToTop::hide');\n    $(window).off('.ScrollToTop');\n  }\n\n  static setDefaults(options) {\n    $.extend(true, DEFAULTS, $.isPlainObject(options) && options);\n  }\n}\n\nvar info = {\n  version:'0.4.3'\n};\n\nconst NAMESPACE = 'scrollToTop';\nconst OtherScrollToTop = $.fn.scrollToTop;\n\nconst jQueryScrollToTop = function(options, ...args) {\n  if (typeof options === 'string') {\n    const method = options;\n\n    if (/^_/.test(method)) {\n      return false;\n    } else if ((/^(get)/.test(method))) {\n      const instance = this.first().data(NAMESPACE);\n      if (instance && typeof instance[method] === 'function') {\n        return instance[method](...args);\n      }\n    } else {\n      return this.each(function() {\n        const instance = $.data(this, NAMESPACE);\n        if (instance && typeof instance[method] === 'function') {\n          instance[method](...args);\n        }\n      });\n    }\n  }\n\n  return this.each(function() {\n    if (!$(this).data(NAMESPACE)) {\n      $(this).data(NAMESPACE, new ScrollToTop(options));\n    }\n  });\n};\n\n$.fn.scrollToTop = jQueryScrollToTop;\n\n$.scrollToTop = $.extend({\n  setDefaults: ScrollToTop.setDefaults,\n  noConflict: function() {\n    $.fn.scrollToTop = OtherScrollToTop;\n    return jQueryScrollToTop;\n  }\n}, info);\n"]}