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/* ============================================================= * bootstrap-scrollspy.js v2.3.1 * http://twitter.github.com/bootstrap/javascript.html#scrollspy
* ============================================================= * Copyright 2012 Twitter, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0
* * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ============================================================== */
!function ($) {
"use strict"; // jshint ;_;
/* SCROLLSPY CLASS DEFINITION * ========================== */
function ScrollSpy(element, options) { var process = $.proxy(this.process, this) , $element = $(element).is('body') ? $(window) : $(element) , href this.options = $.extend({}, $.fn.scrollspy.defaults, options) this.$scrollElement = $element.on('scroll.scroll-spy.data-api', process) this.selector = (this.options.target || ((href = $(element).attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7
|| '') + ' .nav li > a' this.$body = $('body') this.refresh() this.process() }
ScrollSpy.prototype = {
constructor: ScrollSpy
, refresh: function () { var self = this , $targets
this.offsets = $([]) this.targets = $([])
$targets = this.$body .find(this.selector) .map(function () { var $el = $(this) , href = $el.data('target') || $el.attr('href') , $href = /^#\w/.test(href) && $(href) return ( $href && $href.length && [[ $href.position().top + (!$.isWindow(self.$scrollElement.get(0)) && self.$scrollElement.scrollTop()), href ]] ) || null }) .sort(function (a, b) { return a[0] - b[0] }) .each(function () { self.offsets.push(this[0]) self.targets.push(this[1]) }) }
, process: function () { var scrollTop = this.$scrollElement.scrollTop() + this.options.offset , scrollHeight = this.$scrollElement[0].scrollHeight || this.$body[0].scrollHeight , maxScroll = scrollHeight - this.$scrollElement.height() , offsets = this.offsets , targets = this.targets , activeTarget = this.activeTarget , i
if (scrollTop >= maxScroll) { return activeTarget != (i = targets.last()[0]) && this.activate ( i ) }
for (i = offsets.length; i--;) { activeTarget != targets[i] && scrollTop >= offsets[i] && (!offsets[i + 1] || scrollTop <= offsets[i + 1]) && this.activate( targets[i] ) } }
, activate: function (target) { var active , selector
this.activeTarget = target
$(this.selector) .parent('.active') .removeClass('active')
selector = this.selector + '[data-target="' + target + '"],' + this.selector + '[href="' + target + '"]'
active = $(selector) .parent('li') .addClass('active')
if (active.parent('.dropdown-menu').length) { active = active.closest('li.dropdown').addClass('active') }
active.trigger('activate') }
}
/* SCROLLSPY PLUGIN DEFINITION * =========================== */
var old = $.fn.scrollspy
$.fn.scrollspy = function (option) { return this.each(function () { var $this = $(this) , data = $this.data('scrollspy') , options = typeof option == 'object' && option if (!data) $this.data('scrollspy', (data = new ScrollSpy(this, options))) if (typeof option == 'string') data[option]() }) }
$.fn.scrollspy.Constructor = ScrollSpy
$.fn.scrollspy.defaults = { offset: 10 }
/* SCROLLSPY NO CONFLICT * ===================== */
$.fn.scrollspy.noConflict = function () { $.fn.scrollspy = old return this }
/* SCROLLSPY DATA-API * ================== */
$(window).on('load', function () { $('[data-spy="scroll"]').each(function () { var $spy = $(this) $spy.scrollspy($spy.data()) }) })
}(window.jQuery);
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