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Edit File: affix.js

/* ========================================================================
 * Bootstrap: affix.js v3.3.7
 * http://getbootstrap.com/javascript/#affix
 * ========================================================================
 * Copyright 2011-2016 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * ======================================================================== */

+function ($) {
  'use strict';

// AFFIX CLASS DEFINITION
  // ======================

var Affix = function (element, options) {
    this.options = $.extend({}, Affix.DEFAULTS, options)

this.$target = $(this.options.target)
      .on('scroll.bs.affix.data-api', $.proxy(this.checkPosition, this))
      .on('click.bs.affix.data-api',  $.proxy(this.checkPositionWithEventLoop, this))

this.$element     = $(element)
    this.affixed      = null
    this.unpin        = null
    this.pinnedOffset = null

this.checkPosition()
  }

Affix.VERSION  = '3.3.7'

Affix.RESET    = 'affix affix-top affix-bottom'

Affix.DEFAULTS = {
    offset: 0,
    target: window
  }

Affix.prototype.getState = function (scrollHeight, height, offsetTop, offsetBottom) {
    var scrollTop    = this.$target.scrollTop()
    var position     = this.$element.offset()
    var targetHeight = this.$target.height()

if (offsetTop != null && this.affixed == 'top') return scrollTop < offsetTop ? 'top' : false

if (this.affixed == 'bottom') {
      if (offsetTop != null) return (scrollTop + this.unpin <= position.top) ? false : 'bottom'
      return (scrollTop + targetHeight <= scrollHeight - offsetBottom) ? false : 'bottom'
    }

var initializing   = this.affixed == null
    var colliderTop    = initializing ? scrollTop : position.top
    var colliderHeight = initializing ? targetHeight : height

if (offsetTop != null && scrollTop <= offsetTop) return 'top'
    if (offsetBottom != null && (colliderTop + colliderHeight >= scrollHeight - offsetBottom)) return 'bottom'

return false
  }

Affix.prototype.getPinnedOffset = function () {
    if (this.pinnedOffset) return this.pinnedOffset
    this.$element.removeClass(Affix.RESET).addClass('affix')
    var scrollTop = this.$target.scrollTop()
    var position  = this.$element.offset()
    return (this.pinnedOffset = position.top - scrollTop)
  }

Affix.prototype.checkPositionWithEventLoop = function () {
    setTimeout($.proxy(this.checkPosition, this), 1)
  }

Affix.prototype.checkPosition = function () {
    if (!this.$element.is(':visible')) return

var height       = this.$element.height()
    var offset       = this.options.offset
    var offsetTop    = offset.top
    var offsetBottom = offset.bottom
    var scrollHeight = Math.max($(document).height(), $(document.body).height())

if (typeof offset != 'object')         offsetBottom = offsetTop = offset
    if (typeof offsetTop == 'function')    offsetTop    = offset.top(this.$element)
    if (typeof offsetBottom == 'function') offsetBottom = offset.bottom(this.$element)

var affix = this.getState(scrollHeight, height, offsetTop, offsetBottom)

if (this.affixed != affix) {
      if (this.unpin != null) this.$element.css('top', '')

var affixType = 'affix' + (affix ? '-' + affix : '')
      var e         = $.Event(affixType + '.bs.affix')

this.$element.trigger(e)

if (e.isDefaultPrevented()) return

this.affixed = affix
      this.unpin = affix == 'bottom' ? this.getPinnedOffset() : null

this.$element
        .removeClass(Affix.RESET)
        .addClass(affixType)
        .trigger(affixType.replace('affix', 'affixed') + '.bs.affix')
    }

if (affix == 'bottom') {
      this.$element.offset({
        top: scrollHeight - height - offsetBottom
      })
    }
  }

// AFFIX PLUGIN DEFINITION
  // =======================

function Plugin(option) {
    return this.each(function () {
      var $this   = $(this)
      var data    = $this.data('bs.affix')
      var options = typeof option == 'object' && option

if (!data) $this.data('bs.affix', (data = new Affix(this, options)))
      if (typeof option == 'string') data[option]()
    })
  }

var old = $.fn.affix

$.fn.affix             = Plugin
  $.fn.affix.Constructor = Affix

// AFFIX NO CONFLICT
  // =================

$.fn.affix.noConflict = function () {
    $.fn.affix = old
    return this
  }

// AFFIX DATA-API
  // ==============

$(window).on('load', function () {
    $('[data-spy="affix"]').each(function () {
      var $spy = $(this)
      var data = $spy.data()

data.offset = data.offset || {}

if (data.offsetBottom != null) data.offset.bottom = data.offsetBottom
      if (data.offsetTop    != null) data.offset.top    = data.offsetTop

Plugin.call($spy, data)
    })
  })

}(jQuery);

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