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

* Bootstrap: scrollspy.js v3.3.2

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

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

* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)

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

/**

* Custom by iissnan

* - Add a `clear.bs.scrollspy` event.

* - Esacpe targets selector.

+function ($) {

'use strict';

// SCROLLSPY CLASS DEFINITION

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

function ScrollSpy(element, options) {

this.$body = $(document.body)

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

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

this.selector = (this.options.target || '') + ' .nav li > a'

this.offsets = []

this.targets = []

this.activeTarget = null

this.scrollHeight = 0

this.$scrollElement.on('scroll.bs.scrollspy', $.proxy(this.process, this))

this.refresh()

this.process()

}

ScrollSpy.VERSION = '3.3.2'

ScrollSpy.DEFAULTS = {

offset: 10

}

ScrollSpy.prototype.getScrollHeight = function () {

return this.$scrollElement[0].scrollHeight || Math.max(this.$body[0].scrollHeight, document.documentElement.scrollHeight)

}

ScrollSpy.prototype.refresh = function () {

var that = this

var offsetMethod = 'offset'

var offsetBase = 0

this.offsets = []

this.targets = []

this.scrollHeight = this.getScrollHeight()

if (!$.isWindow(this.$scrollElement[0])) {

offsetMethod = 'position'

offsetBase = this.$scrollElement.scrollTop()

}

this.$body

.find(this.selector)

.map(function () {

var $el = $(this)

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

var $href = /^#./.test(href) && $(escapeSelector(href)) // Need to escape selector.

return ($href

&& $href.length

&& $href.is(':visible')

&& [[$href[offsetMethod]().top + offsetBase, href]]) || null

})

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

.each(function () {

that.offsets.push(this[0])

that.targets.push(this[1])

})

}

ScrollSpy.prototype.process = function () {

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

var scrollHeight = this.getScrollHeight()

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

var offsets = this.offsets

var targets = this.targets

var activeTarget = this.activeTarget

var i

if (this.scrollHeight != scrollHeight) {

this.refresh()

}

if (scrollTop >= maxScroll) {

return activeTarget != (i = targets[targets.length - 1]) && this.activate(i)

}

if (activeTarget && scrollTop < offsets[0]) {

$(this.selector).trigger('clear.bs.scrollspy') // Add a custom event.

this.activeTarget = null

return this.clear()

}

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.clear()

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.prototype.clear = function () {

$(this.selector)

.parentsUntil(this.options.target, '.active')

.removeClass('active')

}

// SCROLLSPY PLUGIN DEFINITION

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

function Plugin(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]()

})

}

var old = $.fn.scrollspy

$.fn.scrollspy = Plugin

$.fn.scrollspy.Constructor = ScrollSpy

// SCROLLSPY NO CONFLICT

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

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

$.fn.scrollspy = old

return this

}

// SCROLLSPY DATA-API

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

$(window).on('load.bs.scrollspy.data-api', function () {

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

var $spy = $(this)

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

})

}(jQuery);