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-
-
-
- +function ($) {
- 'use strict';
-
-
-
-
- function ScrollSpy(element, options) {
- this.$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', $.proxy(this.process, this))
- this.refresh()
- this.process()
- }
-
- ScrollSpy.VERSION = '3.3.7'
-
- ScrollSpy.DEFAULTS = {
- offset: 10
- }
-
- ScrollSpy.prototype.getScrollHeight = function () {
- return this.$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) && $(href)
-
- return ($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.activeTarget = null
- return this.clear()
- }
-
- for (i = offsets.length; i--;) {
- activeTarget != targets[i]
- && scrollTop >= offsets[i]
- && (offsets[i + 1] === undefined || 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')
- }
-
-
-
-
-
- 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
-
-
-
-
-
- $.fn.scrollspy.noConflict = function () {
- $.fn.scrollspy = old
- return this
- }
-
-
-
-
-
- $(window).on('load.bs.scrollspy.data-api', function () {
- $('[data-spy="scroll"]').each(function () {
- var $spy = $(this)
- Plugin.call($spy, $spy.data())
- })
- })
-
- }(jQuery);
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