| /* ============================================================= | |
| * bootstrap-scrollspy.js v2.1.0 | |
| * 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 | |
| && [[ $href.position().top, href ]] ) || null | |
| }) | |
| .sort(function (a, b) { return a[0] - b[0] }) | |
| .each(function () { | |
| self.offsets.push(this[0]) | |
| self.targets.push(this[1]) | |
| }) | |
| } | |
| , process: function () { | |
| var scrollTop = this.$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 | |
| * =========================== */ | |
| $.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 DATA-API | |
| * ================== */ | |
| $(window).on('load', function () { | |
| $('[data-spy="scroll"]').each(function () { | |
| var $spy = $(this) | |
| $spy.scrollspy($spy.data()) | |
| }) | |
| }) | |
| }(window.jQuery); |