| /* ========================================================== | |
| * bootstrap-affix.js v2.1.0 | |
| * http://twitter.github.com/bootstrap/javascript.html#affix | |
| * ========================================================== | |
| * 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 ;_; | |
| /* AFFIX CLASS DEFINITION | |
| * ====================== */ | |
| var Affix = function (element, options) { | |
| this.options = $.extend({}, $.fn.affix.defaults, options) | |
| this.$window = $(window).on('scroll.affix.data-api', $.proxy(this.checkPosition, this)) | |
| this.$element = $(element) | |
| this.checkPosition() | |
| } | |
| Affix.prototype.checkPosition = function () { | |
| if (!this.$element.is(':visible')) return | |
| var scrollHeight = $(document).height() | |
| , scrollTop = this.$window.scrollTop() | |
| , position = this.$element.offset() | |
| , offset = this.options.offset | |
| , offsetBottom = offset.bottom | |
| , offsetTop = offset.top | |
| , reset = 'affix affix-top affix-bottom' | |
| , affix | |
| if (typeof offset != 'object') offsetBottom = offsetTop = offset | |
| if (typeof offsetTop == 'function') offsetTop = offset.top() | |
| if (typeof offsetBottom == 'function') offsetBottom = offset.bottom() | |
| affix = this.unpin != null && (scrollTop + this.unpin <= position.top) ? | |
| false : offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ? | |
| 'bottom' : offsetTop != null && scrollTop <= offsetTop ? | |
| 'top' : false | |
| if (this.affixed === affix) return | |
| this.affixed = affix | |
| this.unpin = affix == 'bottom' ? position.top - scrollTop : null | |
| this.$element.removeClass(reset).addClass('affix' + (affix ? '-' + affix : '')) | |
| } | |
| /* AFFIX PLUGIN DEFINITION | |
| * ======================= */ | |
| $.fn.affix = function (option) { | |
| return this.each(function () { | |
| var $this = $(this) | |
| , data = $this.data('affix') | |
| , options = typeof option == 'object' && option | |
| if (!data) $this.data('affix', (data = new Affix(this, options))) | |
| if (typeof option == 'string') data[option]() | |
| }) | |
| } | |
| $.fn.affix.Constructor = Affix | |
| $.fn.affix.defaults = { | |
| offset: 0 | |
| } | |
| /* AFFIX DATA-API | |
| * ============== */ | |
| $(window).on('load', function () { | |
| $('[data-spy="affix"]').each(function () { | |
| var $spy = $(this) | |
| , data = $spy.data() | |
| data.offset = data.offset || {} | |
| data.offsetBottom && (data.offset.bottom = data.offsetBottom) | |
| data.offsetTop && (data.offset.top = data.offsetTop) | |
| $spy.affix(data) | |
| }) | |
| }) | |
| }(window.jQuery); |