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- /* ========================================================================
- * Bootstrap: affix.js v3.0.3
- * http://getbootstrap.com/javascript/#affix
- * ========================================================================
- * Copyright 2013 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";
- // AFFIX CLASS DEFINITION
- // ======================
- var Affix = function (element, options) {
- this.options = $.extend({}, Affix.DEFAULTS, options)
- this.$window = $(window)
- .on('scroll.bs.affix.data-api', $.proxy(this.checkPosition, this))
- .on('click.bs.affix.data-api', $.proxy(this.checkPositionWithEventLoop, this))
- this.$element = $(element)
- this.affixed =
- this.unpin = null
- this.checkPosition()
- }
- Affix.RESET = 'affix affix-top affix-bottom'
- Affix.DEFAULTS = {
- offset: 0
- }
- Affix.prototype.checkPositionWithEventLoop = function () {
- setTimeout($.proxy(this.checkPosition, this), 1)
- }
- Affix.prototype.checkPosition = function () {
- if (!this.$element.is(':visible')) return
- var scrollHeight = $(document).height()
- var scrollTop = this.$window.scrollTop()
- var position = this.$element.offset()
- var offset = this.options.offset
- var offsetTop = offset.top
- var offsetBottom = offset.bottom
- if (typeof offset != 'object') offsetBottom = offsetTop = offset
- if (typeof offsetTop == 'function') offsetTop = offset.top()
- if (typeof offsetBottom == 'function') offsetBottom = offset.bottom()
- var affix = this.unpin != null && (scrollTop + this.unpin <= position.top) ? false :
- offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ? 'bottom' :
- offsetTop != null && (scrollTop <= offsetTop) ? 'top' : false
- if (this.affixed === affix) return
- if (this.unpin) this.$element.css('top', '')
- this.affixed = affix
- this.unpin = affix == 'bottom' ? position.top - scrollTop : null
- this.$element.removeClass(Affix.RESET).addClass('affix' + (affix ? '-' + affix : ''))
- if (affix == 'bottom') {
- this.$element.offset({ top: document.body.offsetHeight - offsetBottom - this.$element.height() })
- }
- }
- // AFFIX PLUGIN DEFINITION
- // =======================
- var old = $.fn.affix
- $.fn.affix = function (option) {
- return this.each(function () {
- var $this = $(this)
- var data = $this.data('bs.affix')
- var options = typeof option == 'object' && option
- if (!data) $this.data('bs.affix', (data = new Affix(this, options)))
- if (typeof option == 'string') data[option]()
- })
- }
- $.fn.affix.Constructor = Affix
- // AFFIX NO CONFLICT
- // =================
- $.fn.affix.noConflict = function () {
- $.fn.affix = old
- return this
- }
- // AFFIX DATA-API
- // ==============
- $(window).on('load', function () {
- $('[data-spy="affix"]').each(function () {
- var $spy = $(this)
- var data = $spy.data()
- data.offset = data.offset || {}
- if (data.offsetBottom) data.offset.bottom = data.offsetBottom
- if (data.offsetTop) data.offset.top = data.offsetTop
- $spy.affix(data)
- })
- })
- }(jQuery);
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