https://mxdm999.com/usr/themes/Joe-master/assets/plugin/twitter-bootstrap/3.4.1/js/scrollspy.js?version=1.3294

1/* ========================================================================
2 * Bootstrap: scrollspy.js v3.4.1
3 * https://getbootstrap.com/docs/3.4/javascript/#scrollspy
4 * ========================================================================
5 * Copyright 2011-2019 Twitter, Inc.
6 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
7 * ======================================================================== */
8
9
10+function ($) {
11	'use strict';
12
13	// SCROLLSPY CLASS DEFINITION
14	// ==========================
15
16	function ScrollSpy(element, options) {
17		this.$body = $(document.body)
18		this.$scrollElement = $(element).is(document.body) ? $(window) : $(element)
19		this.options = $.extend({}, ScrollSpy.DEFAULTS, options)
20		this.selector = (this.options.target || '') + ' .nav li > a'
21		this.offsets = []
22		this.targets = []
23		this.activeTarget = null
24		this.scrollHeight = 0
25
26		this.$scrollElement.on('scroll.bs.scrollspy', $.proxy(this.process, this))
27		this.refresh()
28		this.process()
29	}
30
31	ScrollSpy.VERSION = '3.4.1'
32
33	ScrollSpy.DEFAULTS = {
34		offset: 10
35	}
36
37	ScrollSpy.prototype.getScrollHeight = function () {
38		return this.$scrollElement[0].scrollHeight || Math.max(this.$body[0].scrollHeight, document.documentElement.scrollHeight)
39	}
40
41	ScrollSpy.prototype.refresh = function () {
42		var that = this
43		var offsetMethod = 'offset'
44		var offsetBase = 0
45
46		this.offsets = []
47		this.targets = []
48		this.scrollHeight = this.getScrollHeight()
49
50		if (!$.isWindow(this.$scrollElement[0])) {
51			offsetMethod = 'position'
52			offsetBase = this.$scrollElement.scrollTop()
53		}
54
55		this.$body
56			.find(this.selector)
57			.map(function () {
58				var $el = $(this)
59				var href = $el.data('target') || $el.attr('href')
60				var $href = /^#./.test(href) && $(href)
61
62				return ($href
63					&& $href.length
64					&& $href.is(':visible')
65					&& [[$href[offsetMethod]().top + offsetBase, href]]) || null
66			})
67			.sort(function (a, b) { return a[0] - b[0] })
68			.each(function () {
69				that.offsets.push(this[0])
70				that.targets.push(this[1])
71			})
72	}
73
74	ScrollSpy.prototype.process = function () {
75		var scrollTop = this.$scrollElement.scrollTop() + this.options.offset
76		var scrollHeight = this.getScrollHeight()
77		var maxScroll = this.options.offset + scrollHeight - this.$scrollElement.height()
78		var offsets = this.offsets
79		var targets = this.targets
80		var activeTarget = this.activeTarget
81		var i
82
83		if (this.scrollHeight != scrollHeight) {
84			this.refresh()
85		}
86
87		if (scrollTop >= maxScroll) {
88			return activeTarget != (i = targets[targets.length - 1]) && this.activate(i)
89		}
90
91		if (activeTarget && scrollTop < offsets[0]) {
92			this.activeTarget = null
93			return this.clear()
94		}
95
96		for (i = offsets.length; i--;) {
97			activeTarget != targets[i]
98				&& scrollTop >= offsets[i]
99				&& (offsets[i + 1] === undefined || scrollTop < offsets[i + 1])
100				&& this.activate(targets[i])
101		}
102	}
103
104	ScrollSpy.prototype.activate = function (target) {
105		this.activeTarget = target
106
107		this.clear()
108
109		var selector = this.selector +
110			'[data-target="' + target + '"],' +
111			this.selector + '[href="' + target + '"]'
112
113		var active = $(selector)
114			.parents('li')
115			.addClass('active')
116
117		if (active.parent('.dropdown-menu').length) {
118			active = active
119				.closest('li.dropdown')
120				.addClass('active')
121		}
122
123		active.trigger('activate.bs.scrollspy')
124	}
125
126	ScrollSpy.prototype.clear = function () {
127		$(this.selector)
128			.parentsUntil(this.options.target, '.active')
129			.removeClass('active')
130	}
131
132
133	// SCROLLSPY PLUGIN DEFINITION
134	// ===========================
135
136	function Plugin(option) {
137		return this.each(function () {
138			var $this = $(this)
139			var data = $this.data('bs.scrollspy')
140			var options = typeof option == 'object' && option
141
142			if (!data) $this.data('bs.scrollspy', (data = new ScrollSpy(this, options)))
143			if (typeof option == 'string') data[option]()
144		})
145	}
146
147	var old = $.fn.scrollspy
148
149	$.fn.scrollspy = Plugin
150	$.fn.scrollspy.Constructor = ScrollSpy
151
152
153	// SCROLLSPY NO CONFLICT
154	// =====================
155
156	$.fn.scrollspy.noConflict = function () {
157		$.fn.scrollspy = old
158		return this
159	}
160
161
162	// SCROLLSPY DATA-API
163	// ==================
164
165	$(window).on('load.bs.scrollspy.data-api', function () {
166		$('[data-spy="scroll"]').each(function () {
167			var $spy = $(this)
168			Plugin.call($spy, $spy.data())
169		})
170	})
171
172}(jQuery);