https://www.tredess.com/sites/all/themes/tr_bootstrap/bootstrap/js/scrollspy.js?tmogjk

1/* ========================================================================
2 * Bootstrap: scrollspy.js v3.0.0
3 * http://twbs.github.com/bootstrap/javascript.html#scrollspy
4 * ========================================================================
5 * Copyright 2012 Twitter, Inc.
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ======================================================================== */
19
20
21+function ($) { "use strict";
22
23  // SCROLLSPY CLASS DEFINITION
24  // ==========================
25
26  function ScrollSpy(element, options) {
27    var href
28    var process  = $.proxy(this.process, this)
29
30    this.$element       = $(element).is('body') ? $(window) : $(element)
31    this.$body          = $('body')
32    this.$scrollElement = this.$element.on('scroll.bs.scroll-spy.data-api', process)
33    this.options        = $.extend({}, ScrollSpy.DEFAULTS, options)
34    this.selector       = (this.options.target
35      || ((href = $(element).attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7
36      || '') + ' .nav li > a'
37    this.offsets        = $([])
38    this.targets        = $([])
39    this.activeTarget   = null
40
41    this.refresh()
42    this.process()
43  }
44
45  ScrollSpy.DEFAULTS = {
46    offset: 10
47  }
48
49  ScrollSpy.prototype.refresh = function () {
50    var offsetMethod = this.$element[0] == window ? 'offset' : 'position'
51
52    this.offsets = $([])
53    this.targets = $([])
54
55    var self     = this
56    var $targets = this.$body
57      .find(this.selector)
58      .map(function () {
59        var $el   = $(this)
60        var href  = $el.data('target') || $el.attr('href')
61        var $href = /^#\w/.test(href) && $(href)
62
63        return ($href
64          && $href.length
65          && [[ $href[offsetMethod]().top + (!$.isWindow(self.$scrollElement.get(0)) && self.$scrollElement.scrollTop()), href ]]) || null
66      })
67      .sort(function (a, b) { return a[0] - b[0] })
68      .each(function () {
69        self.offsets.push(this[0])
70        self.targets.push(this[1])
71      })
72  }
73
74  ScrollSpy.prototype.process = function () {
75    var scrollTop    = this.$scrollElement.scrollTop() + this.options.offset
76    var scrollHeight = this.$scrollElement[0].scrollHeight || this.$body[0].scrollHeight
77    var maxScroll    = scrollHeight - this.$scrollElement.height()
78    var offsets      = this.offsets
79    var targets      = this.targets
80    var activeTarget = this.activeTarget
81    var i
82
83    if (scrollTop >= maxScroll) {
84      return activeTarget != (i = targets.last()[0]) && this.activate(i)
85    }
86
87    for (i = offsets.length; i--;) {
88      activeTarget != targets[i]
89        && scrollTop >= offsets[i]
90        && (!offsets[i + 1] || scrollTop <= offsets[i + 1])
91        && this.activate( targets[i] )
92    }
93  }
94
95  ScrollSpy.prototype.activate = function (target) {
96    this.activeTarget = target
97
98    $(this.selector)
99      .parents('.active')
100      .removeClass('active')
101
102    var selector = this.selector
103      + '[data-target="' + target + '"],'
104      + this.selector + '[href="' + target + '"]'
105
106    var active = $(selector)
107      .parents('li')
108      .addClass('active')
109
110    if (active.parent('.dropdown-menu').length)  {
111      active = active
112        .closest('li.dropdown')
113        .addClass('active')
114    }
115
116    active.trigger('activate')
117  }
118
119
120  // SCROLLSPY PLUGIN DEFINITION
121  // ===========================
122
123  var old = $.fn.scrollspy
124
125  $.fn.scrollspy = function (option) {
126    return this.each(function () {
127      var $this   = $(this)
128      var data    = $this.data('bs.scrollspy')
129      var options = typeof option == 'object' && option
130
131      if (!data) $this.data('bs.scrollspy', (data = new ScrollSpy(this, options)))
132      if (typeof option == 'string') data[option]()
133    })
134  }
135
136  $.fn.scrollspy.Constructor = ScrollSpy
137
138
139  // SCROLLSPY NO CONFLICT
140  // =====================
141
142  $.fn.scrollspy.noConflict = function () {
143    $.fn.scrollspy = old
144    return this
145  }
146
147
148  // SCROLLSPY DATA-API
149  // ==================
150
151  $(window).on('load', function () {
152    $('[data-spy="scroll"]').each(function () {
153      var $spy = $(this)
154      $spy.scrollspy($spy.data())
155    })
156  })
157
158}(window.jQuery);