/bower_components/bootstrap/js/affix.js |
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/* ======================================================================== |
* Bootstrap: affix.js v3.3.7 |
* http://getbootstrap.com/javascript/#affix |
* ======================================================================== |
* Copyright 2011-2016 Twitter, Inc. |
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE) |
* ======================================================================== */ |
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+function ($) { |
'use strict'; |
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// AFFIX CLASS DEFINITION |
// ====================== |
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var Affix = function (element, options) { |
this.options = $.extend({}, Affix.DEFAULTS, options) |
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this.$target = $(this.options.target) |
.on('scroll.bs.affix.data-api', $.proxy(this.checkPosition, this)) |
.on('click.bs.affix.data-api', $.proxy(this.checkPositionWithEventLoop, this)) |
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this.$element = $(element) |
this.affixed = null |
this.unpin = null |
this.pinnedOffset = null |
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this.checkPosition() |
} |
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Affix.VERSION = '3.3.7' |
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Affix.RESET = 'affix affix-top affix-bottom' |
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Affix.DEFAULTS = { |
offset: 0, |
target: window |
} |
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Affix.prototype.getState = function (scrollHeight, height, offsetTop, offsetBottom) { |
var scrollTop = this.$target.scrollTop() |
var position = this.$element.offset() |
var targetHeight = this.$target.height() |
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if (offsetTop != null && this.affixed == 'top') return scrollTop < offsetTop ? 'top' : false |
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if (this.affixed == 'bottom') { |
if (offsetTop != null) return (scrollTop + this.unpin <= position.top) ? false : 'bottom' |
return (scrollTop + targetHeight <= scrollHeight - offsetBottom) ? false : 'bottom' |
} |
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var initializing = this.affixed == null |
var colliderTop = initializing ? scrollTop : position.top |
var colliderHeight = initializing ? targetHeight : height |
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if (offsetTop != null && scrollTop <= offsetTop) return 'top' |
if (offsetBottom != null && (colliderTop + colliderHeight >= scrollHeight - offsetBottom)) return 'bottom' |
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return false |
} |
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Affix.prototype.getPinnedOffset = function () { |
if (this.pinnedOffset) return this.pinnedOffset |
this.$element.removeClass(Affix.RESET).addClass('affix') |
var scrollTop = this.$target.scrollTop() |
var position = this.$element.offset() |
return (this.pinnedOffset = position.top - scrollTop) |
} |
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Affix.prototype.checkPositionWithEventLoop = function () { |
setTimeout($.proxy(this.checkPosition, this), 1) |
} |
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Affix.prototype.checkPosition = function () { |
if (!this.$element.is(':visible')) return |
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var height = this.$element.height() |
var offset = this.options.offset |
var offsetTop = offset.top |
var offsetBottom = offset.bottom |
var scrollHeight = Math.max($(document).height(), $(document.body).height()) |
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if (typeof offset != 'object') offsetBottom = offsetTop = offset |
if (typeof offsetTop == 'function') offsetTop = offset.top(this.$element) |
if (typeof offsetBottom == 'function') offsetBottom = offset.bottom(this.$element) |
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var affix = this.getState(scrollHeight, height, offsetTop, offsetBottom) |
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if (this.affixed != affix) { |
if (this.unpin != null) this.$element.css('top', '') |
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var affixType = 'affix' + (affix ? '-' + affix : '') |
var e = $.Event(affixType + '.bs.affix') |
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this.$element.trigger(e) |
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if (e.isDefaultPrevented()) return |
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this.affixed = affix |
this.unpin = affix == 'bottom' ? this.getPinnedOffset() : null |
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this.$element |
.removeClass(Affix.RESET) |
.addClass(affixType) |
.trigger(affixType.replace('affix', 'affixed') + '.bs.affix') |
} |
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if (affix == 'bottom') { |
this.$element.offset({ |
top: scrollHeight - height - offsetBottom |
}) |
} |
} |
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// AFFIX PLUGIN DEFINITION |
// ======================= |
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function Plugin(option) { |
return this.each(function () { |
var $this = $(this) |
var data = $this.data('bs.affix') |
var options = typeof option == 'object' && option |
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if (!data) $this.data('bs.affix', (data = new Affix(this, options))) |
if (typeof option == 'string') data[option]() |
}) |
} |
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var old = $.fn.affix |
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$.fn.affix = Plugin |
$.fn.affix.Constructor = Affix |
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// AFFIX NO CONFLICT |
// ================= |
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$.fn.affix.noConflict = function () { |
$.fn.affix = old |
return this |
} |
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// AFFIX DATA-API |
// ============== |
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$(window).on('load', function () { |
$('[data-spy="affix"]').each(function () { |
var $spy = $(this) |
var data = $spy.data() |
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data.offset = data.offset || {} |
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if (data.offsetBottom != null) data.offset.bottom = data.offsetBottom |
if (data.offsetTop != null) data.offset.top = data.offsetTop |
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Plugin.call($spy, data) |
}) |
}) |
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}(jQuery); |