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affix.js 3.9KB

    /* ======================================================================== * Bootstrap: affix.js v3.1.1 * http://getbootstrap.com/javascript/#affix * ======================================================================== * Copyright 2011-2014 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/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 = $(element) this.affixed = this.unpin = this.pinnedOffset = null this.checkPosition() } Affix.RESET = 'affix affix-top affix-bottom' Affix.DEFAULTS = { offset: 0 } Affix.prototype.getPinnedOffset = function () { if (this.pinnedOffset) return this.pinnedOffset this.$element.removeClass(Affix.RESET).addClass('affix') var scrollTop = this.$window.scrollTop() var position = this.$element.offset() return (this.pinnedOffset = position.top - scrollTop) } 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.$element.offset() var offset = this.options.offset var offsetTop = offset.top var offsetBottom = offset.bottom if (this.affixed == 'top') position.top += scrollTop if (typeof offset != 'object') offsetBottom = offsetTop = offset if (typeof offsetTop == 'function') offsetTop = offset.top(this.$element) if (typeof offsetBottom == 'function') offsetBottom = offset.bottom(this.$element) var affix = this.unpin != null && (scrollTop + this.unpin <= position.top) ? false : offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ? 'bottom' : offsetTop != null && (scrollTop <= offsetTop) ? 'top' : false if (this.affixed === affix) return if (this.unpin) this.$element.css('top', '') var affixType = 'affix' + (affix ? '-' + affix : '') var e = $.Event(affixType + '.bs.affix') this.$element.trigger(e) if (e.isDefaultPrevented()) return this.affixed = affix this.unpin = affix == 'bottom' ? this.getPinnedOffset() : null this.$element .removeClass(Affix.RESET) .addClass(affixType) .trigger($.Event(affixType.replace('affix', 'affixed'))) if (affix == 'bottom') { this.$element.offset({ top: scrollHeight - offsetBottom - this.$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);