mirror of https://github.com/twbs/bootstrap.git
104 lines
3.1 KiB
JavaScript
104 lines
3.1 KiB
JavaScript
/* ==========================================================
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* bootstrap-affix.js v2.1.2
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* http://twitter.github.com/bootstrap/javascript.html#affix
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* ==========================================================
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* Copyright 2012 Twitter, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* ========================================================== */
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!function ($) {
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"use strict"; // jshint ;_;
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/* AFFIX CLASS DEFINITION
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* ====================== */
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var Affix = function (element, options) {
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this.options = $.extend({}, $.fn.affix.defaults, options)
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this.$window = $(window).on('scroll.affix.data-api', $.proxy(this.checkPosition, this))
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this.$element = $(element)
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this.checkPosition()
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}
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Affix.prototype.checkPosition = function () {
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if (!this.$element.is(':visible')) return
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var scrollHeight = $(document).height()
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, scrollTop = this.$window.scrollTop()
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, position = this.$element.offset()
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, offset = this.options.offset
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, offsetBottom = offset.bottom
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, offsetTop = offset.top
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, reset = 'affix affix-top affix-bottom'
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, affix
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if (typeof offset != 'object') offsetBottom = offsetTop = offset
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if (typeof offsetTop == 'function') offsetTop = offset.top()
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if (typeof offsetBottom == 'function') offsetBottom = offset.bottom()
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affix = this.unpin != null && (scrollTop + this.unpin <= position.top) ?
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false : offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ?
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'bottom' : offsetTop != null && scrollTop <= offsetTop ?
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'top' : false
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if (this.affixed === affix) return
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this.affixed = affix
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this.unpin = affix == 'bottom' ? position.top - scrollTop : null
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this.$element.removeClass(reset).addClass('affix' + (affix ? '-' + affix : ''))
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}
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/* AFFIX PLUGIN DEFINITION
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* ======================= */
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$.fn.affix = function (option) {
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return this.each(function () {
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var $this = $(this)
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, data = $this.data('affix')
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, options = typeof option == 'object' && option
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if (!data) $this.data('affix', (data = new Affix(this, options)))
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if (typeof option == 'string') data[option]()
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})
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}
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$.fn.affix.Constructor = Affix
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$.fn.affix.defaults = {
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offset: 0
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}
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/* AFFIX DATA-API
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* ============== */
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$(window).on('load', function () {
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$('[data-spy="affix"]').each(function () {
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var $spy = $(this)
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, data = $spy.data()
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data.offset = data.offset || {}
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data.offsetBottom && (data.offset.bottom = data.offsetBottom)
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data.offsetTop && (data.offset.top = data.offsetTop)
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$spy.affix(data)
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})
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})
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}(window.jQuery); |