/* ========================================================================

  * Bootstrap: scrollspy.js v3.0.3

  * http://getbootstrap.com/javascript/#scrollspy

  * ========================================================================

  * Copyright 2013 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";

   // SCROLLSPY CLASS DEFINITION

   // ==========================

   function ScrollSpy(element, options) {

     var href

     var process  = $.proxy(this.process, this)

     this.$element       = $(element).is('body') ? $(window) : $(element)

     this.$body          = $('body')

     this.$scrollElement = this.$element.on('scroll.bs.scroll-spy.data-api', process)

     this.options        = $.extend({}, ScrollSpy.DEFAULTS, options)

     this.selector       = (this.options.target

       || ((href = $(element).attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7

       || '') + ' .nav li > a'

     this.offsets        = $([])

     this.targets        = $([])

     this.activeTarget   = null

     this.refresh()

     this.process()

   }

   ScrollSpy.DEFAULTS = {

     offset: 10

   }

   ScrollSpy.prototype.refresh = function () {

     var offsetMethod = this.$element[0] == window ? 'offset' : 'position'

     this.offsets = $([])

     this.targets = $([])

     var self     = this

     var $targets = this.$body

       .find(this.selector)

       .map(function () {

         var $el   = $(this)

         var href  = $el.data('target') || $el.attr('href')

         var $href = /^#\w/.test(href) && $(href)

         return ($href

           && $href.length

           && [[ $href[offsetMethod]().top + (!$.isWindow(self.$scrollElement.get(0)) && self.$scrollElement.scrollTop()), href ]]) || null

       })

       .sort(function (a, b) { return a[0] - b[0] })

       .each(function () {

         self.offsets.push(this[0])

         self.targets.push(this[1])

       })

   }

   ScrollSpy.prototype.process = function () {

     var scrollTop    = this.$scrollElement.scrollTop() + this.options.offset

     var scrollHeight = this.$scrollElement[0].scrollHeight || this.$body[0].scrollHeight

     var maxScroll    = scrollHeight - this.$scrollElement.height()

     var offsets      = this.offsets

     var targets      = this.targets

     var activeTarget = this.activeTarget

     var i

     if (scrollTop >= maxScroll) {

       return activeTarget != (i = targets.last()[0]) && this.activate(i)

     }

     for (i = offsets.length; i--;) {

       activeTarget != targets[i]

         && scrollTop >= offsets[i]

         && (!offsets[i + 1] || scrollTop <= offsets[i + 1])

         && this.activate( targets[i] )

     }

   }

   ScrollSpy.prototype.activate = function (target) {

     this.activeTarget = target

     $(this.selector)

       .parents('.active')

       .removeClass('active')

     var selector = this.selector

       + '[data-target="' + target + '"],'

       + this.selector + '[href="' + target + '"]'

     var active = $(selector)

       .parents('li')

       .addClass('active')

     if (active.parent('.dropdown-menu').length)  {

       active = active

         .closest('li.dropdown')

         .addClass('active')

     }

     active.trigger('activate.bs.scrollspy')

   }

   // SCROLLSPY PLUGIN DEFINITION

   // ===========================

   var old = $.fn.scrollspy

   $.fn.scrollspy = function (option) {

     return this.each(function () {

       var $this   = $(this)

       var data    = $this.data('bs.scrollspy')

       var options = typeof option == 'object' && option

       if (!data) $this.data('bs.scrollspy', (data = new ScrollSpy(this, options)))

       if (typeof option == 'string') data[option]()

     })

   }

   $.fn.scrollspy.Constructor = ScrollSpy

   // SCROLLSPY NO CONFLICT

   // =====================

   $.fn.scrollspy.noConflict = function () {

     $.fn.scrollspy = old

     return this

   }

   // SCROLLSPY DATA-API

   // ==================

   $(window).on('load', function () {

     $('[data-spy="scroll"]').each(function () {

       var $spy = $(this)

       $spy.scrollspy($spy.data())

     })

   })

 }(jQuery);