+function ($){
'use strict';
var Affix=function (element, options){
this.options=$.extend({}, Affix.DEFAULTS, options)
this.$target=$(this.options.target)
.on('scroll.bs.affix.data-api', $.proxy(this.checkPosition, this))
.on('click.bs.affix.data-api',  $.proxy(this.checkPositionWithEventLoop, this))
this.$element=$(element)
this.affixed=null
this.unpin=null
this.pinnedOffset=null
this.checkPosition()
}
Affix.VERSION='3.3.7'
Affix.RESET='affix affix-top affix-bottom'
Affix.DEFAULTS={
offset: 0,
target: window
}
Affix.prototype.getState=function (scrollHeight, height, offsetTop, offsetBottom){
var scrollTop=this.$target.scrollTop()
var position=this.$element.offset()
var targetHeight=this.$target.height()
if(offsetTop!=null&&this.affixed=='top') return scrollTop < offsetTop ? 'top':false
if(this.affixed=='bottom'){
if(offsetTop!=null) return (scrollTop + this.unpin <=position.top) ? false:'bottom'
return (scrollTop + targetHeight <=scrollHeight - offsetBottom) ? false:'bottom'
}
var initializing=this.affixed==null
var colliderTop=initializing ? scrollTop:position.top
var colliderHeight=initializing ? targetHeight:height
if(offsetTop!=null&&scrollTop <=offsetTop) return 'top'
if(offsetBottom!=null&&(colliderTop + colliderHeight >=scrollHeight - offsetBottom)) return 'bottom'
return false
}
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.$element.offset()
return (this.pinnedOffset=position.top - scrollTop)
}
Affix.prototype.checkPositionWithEventLoop=function (){
setTimeout($.proxy(this.checkPosition, this), 1)
}
Affix.prototype.checkPosition=function (){
if(!this.$element.is(':visible')) return
var height=this.$element.height()
var offset=this.options.offset
var offsetTop=offset.top
var offsetBottom=offset.bottom
var scrollHeight=Math.max($(document).height(), $(document.body).height())
if(typeof offset!='object')         offsetBottom=offsetTop=offset
if(typeof offsetTop=='function')    offsetTop=offset.top(this.$element)
if(typeof offsetBottom=='function') offsetBottom=offset.bottom(this.$element)
var affix=this.getState(scrollHeight, height, offsetTop, offsetBottom)
if(this.affixed!=affix){
if(this.unpin!=null) this.$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.$element
.removeClass(Affix.RESET)
.addClass(affixType)
.trigger(affixType.replace('affix', 'affixed') + '.bs.affix')
}
if(affix=='bottom'){
this.$element.offset({
top: scrollHeight - height - offsetBottom
})
}}
function Plugin(option){
return this.each(function (){
var $this=$(this)
var data=$this.data('bs.affix')
var options=typeof option=='object'&&option
if(!data) $this.data('bs.affix', (data=new Affix(this, options)))
if(typeof option=='string') data[option]()
})
}
var old=$.fn.affix
$.fn.affix=Plugin
$.fn.affix.Constructor=Affix
$.fn.affix.noConflict=function (){
$.fn.affix=old
return this
}
$(window).on('load', function (){
$('[data-spy="affix"]').each(function (){
var $spy=$(this)
var data=$spy.data()
data.offset=data.offset||{}
if(data.offsetBottom!=null) data.offset.bottom=data.offsetBottom
if(data.offsetTop!=null) data.offset.top=data.offsetTop
Plugin.call($spy, data)
})
})
}(jQuery);