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172 lines
4.6 KiB
172 lines
4.6 KiB
/* ========================================================================
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* Bootstrap: scrollspy.js v3.3.7
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* http://getbootstrap.com/javascript/#scrollspy
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* ========================================================================
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* Copyright 2011-2016 Twitter, Inc.
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* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
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* ======================================================================== */
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+function ($) {
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'use strict';
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// SCROLLSPY CLASS DEFINITION
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// ==========================
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function ScrollSpy(element, options) {
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this.$body = $(document.body)
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this.$scrollElement = $(element).is(document.body) ? $(window) : $(element)
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this.options = $.extend({}, ScrollSpy.DEFAULTS, options)
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this.selector = (this.options.target || '') + ' .nav li > a'
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this.offsets = []
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this.targets = []
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this.activeTarget = null
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this.scrollHeight = 0
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this.$scrollElement.on('scroll.bs.scrollspy', $.proxy(this.process, this))
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this.refresh()
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this.process()
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}
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ScrollSpy.VERSION = '3.3.7'
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ScrollSpy.DEFAULTS = {
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offset: 10
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}
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ScrollSpy.prototype.getScrollHeight = function () {
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return this.$scrollElement[0].scrollHeight || Math.max(this.$body[0].scrollHeight, document.documentElement.scrollHeight)
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}
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ScrollSpy.prototype.refresh = function () {
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var that = this
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var offsetMethod = 'offset'
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var offsetBase = 0
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this.offsets = []
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this.targets = []
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this.scrollHeight = this.getScrollHeight()
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if (!$.isWindow(this.$scrollElement[0])) {
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offsetMethod = 'position'
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offsetBase = this.$scrollElement.scrollTop()
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}
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this.$body
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.find(this.selector)
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.map(function () {
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var $el = $(this)
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var href = $el.data('target') || $el.attr('href')
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var $href = /^#./.test(href) && $(href)
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return ($href
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&& $href.length
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&& $href.is(':visible')
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&& [[$href[offsetMethod]().top + offsetBase, href]]) || null
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})
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.sort(function (a, b) { return a[0] - b[0] })
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.each(function () {
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that.offsets.push(this[0])
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that.targets.push(this[1])
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})
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}
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ScrollSpy.prototype.process = function () {
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var scrollTop = this.$scrollElement.scrollTop() + this.options.offset
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var scrollHeight = this.getScrollHeight()
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var maxScroll = this.options.offset + scrollHeight - this.$scrollElement.height()
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var offsets = this.offsets
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var targets = this.targets
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var activeTarget = this.activeTarget
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var i
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if (this.scrollHeight != scrollHeight) {
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this.refresh()
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}
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if (scrollTop >= maxScroll) {
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return activeTarget != (i = targets[targets.length - 1]) && this.activate(i)
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}
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if (activeTarget && scrollTop < offsets[0]) {
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this.activeTarget = null
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return this.clear()
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}
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for (i = offsets.length; i--;) {
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activeTarget != targets[i]
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&& scrollTop >= offsets[i]
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&& (offsets[i + 1] === undefined || scrollTop < offsets[i + 1])
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&& this.activate(targets[i])
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}
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}
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ScrollSpy.prototype.activate = function (target) {
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this.activeTarget = target
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this.clear()
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var selector = this.selector +
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'[data-target="' + target + '"],' +
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this.selector + '[href="' + target + '"]'
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var active = $(selector)
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.parents('li')
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.addClass('active')
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if (active.parent('.dropdown-menu').length) {
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active = active
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.closest('li.dropdown')
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.addClass('active')
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}
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active.trigger('activate.bs.scrollspy')
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}
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ScrollSpy.prototype.clear = function () {
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$(this.selector)
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.parentsUntil(this.options.target, '.active')
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.removeClass('active')
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}
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// SCROLLSPY PLUGIN DEFINITION
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// ===========================
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function Plugin(option) {
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return this.each(function () {
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var $this = $(this)
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var data = $this.data('bs.scrollspy')
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var options = typeof option == 'object' && option
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if (!data) $this.data('bs.scrollspy', (data = new ScrollSpy(this, options)))
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if (typeof option == 'string') data[option]()
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})
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}
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var old = $.fn.scrollspy
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$.fn.scrollspy = Plugin
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$.fn.scrollspy.Constructor = ScrollSpy
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// SCROLLSPY NO CONFLICT
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// =====================
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$.fn.scrollspy.noConflict = function () {
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$.fn.scrollspy = old
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return this
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}
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// SCROLLSPY DATA-API
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// ==================
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$(window).on('load.bs.scrollspy.data-api', function () {
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$('[data-spy="scroll"]').each(function () {
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var $spy = $(this)
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Plugin.call($spy, $spy.data())
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})
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})
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}(jQuery);
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