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Edit File: bootstrap-affix.js

/* ==========================================================
 * bootstrap-affix.js v2.3.1
 * http://twitter.github.com/bootstrap/javascript.html#affix
 * ==========================================================
 * Copyright 2012 Twitter, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ========================================================== */

!function ($) {

"use strict"; // jshint ;_;

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

var Affix = function (element, options) {
    this.options = $.extend({}, $.fn.affix.defaults, options)
    this.$window = $(window)
      .on('scroll.affix.data-api', $.proxy(this.checkPosition, this))
      .on('click.affix.data-api',  $.proxy(function () { setTimeout($.proxy(this.checkPosition, this), 1) }, this))
    this.$element = $(element)
    this.checkPosition()
  }

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

var scrollHeight = $(document).height()
      , scrollTop = this.$window.scrollTop()
      , position = this.$element.offset()
      , offset = this.options.offset
      , offsetBottom = offset.bottom
      , offsetTop = offset.top
      , reset = 'affix affix-top affix-bottom'
      , affix

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

affix = this.unpin != null && (scrollTop + this.unpin <= position.top) ?
      false    : offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ?
      'bottom' : offsetTop != null && scrollTop <= offsetTop ?
      'top'    : false

if (this.affixed === affix) return

this.affixed = affix
    this.unpin = affix == 'bottom' ? position.top - scrollTop : null

this.$element.removeClass(reset).addClass('affix' + (affix ? '-' + affix : ''))
  }

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

var old = $.fn.affix

$.fn.affix = function (option) {
    return this.each(function () {
      var $this = $(this)
        , data = $this.data('affix')
        , options = typeof option == 'object' && option
      if (!data) $this.data('affix', (data = new Affix(this, options)))
      if (typeof option == 'string') data[option]()
    })
  }

$.fn.affix.Constructor = Affix

$.fn.affix.defaults = {
    offset: 0
  }

/* 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)
        , data = $spy.data()

data.offset = data.offset || {}

data.offsetBottom && (data.offset.bottom = data.offsetBottom)
      data.offsetTop && (data.offset.top = data.offsetTop)

$spy.affix(data)
    })
  })

}(window.jQuery);