/*!
* headhesive v1.1.1 - An on-demand sticky header
* Url: http://markgoodyear.com/labs/headhesive
* Copyright (c) Mark Goodyear ? @markgdyr ? http://markgoodyear.com
* License: MIT
*/
!function(t,s,e){"use strict";function i(t){for(var s=0;t;)s+=t.offsetTop,t=t.offsetParent;return s}var o=function(t,s){for(var e in s)s.hasOwnProperty(e)&&(t[e]="object"==typeof s[e]?o(t[e],s[e]):s[e]);return t},n=function(t,s){var e,i,o,n=Date.now||function(){return(new Date).getTime()},l=null,c=0,h=function(){c=n(),l=null,o=t.apply(e,i),e=i=null};return function(){var r=n(),f=s-(r-c);return e=this,i=arguments,0>=f?(clearTimeout(l),l=null,c=r,o=t.apply(e,i),e=i=null):l||(l=setTimeout(h,f)),o}},l=function(){return t.pageYOffset!==e?t.pageYOffset:(s.documentElement||s.body.parentNode||s.body).scrollTop},c=function(e,i){"querySelector"in s&&"addEventListener"in t&&(this.visible=!1,this.options={offset:300,classes:{clone:"headhesive",stick:"headhesive--stick",unstick:"headhesive--unstick"},throttle:250,onInit:function(){},onStick:function(){},onUnstick:function(){},onDestroy:function(){}},this.elem="string"==typeof e?s.querySelector(e):e,this.options=o(this.options,i),this.init())};c.prototype={constructor:c,init:function(){if(this.clonedElem=this.elem.cloneNode(!0),this.clonedElem.className+=" "+this.options.classes.clone,s.body.insertBefore(this.clonedElem,s.body.firstChild),"number"==typeof this.options.offset)this.scrollOffset=this.options.offset;else{if("string"!=typeof this.options.offset)throw new Error("Invalid offset: "+this.options.offset);this.scrollOffset=i(s.querySelector(this.options.offset))}this._throttleUpdate=n(this.update.bind(this),this.options.throttle),t.addEventListener("scroll",this._throttleUpdate,!1),this.options.onInit.call(this)},destroy:function(){s.body.removeChild(this.clonedElem),t.removeEventListener("scroll",this._throttleUpdate),this.options.onDestroy.call(this)},stick:function(){this.visible||(this.clonedElem.className=this.clonedElem.className.replace(new RegExp("(^|\\s)*"+this.options.classes.unstick+"(\\s|$)*","g"),""),this.clonedElem.className+=" "+this.options.classes.stick,this.visible=!0,this.options.onStick.call(this))},unstick:function(){this.visible&&(this.clonedElem.className=this.clonedElem.className.replace(new RegExp("(^|\\s)*"+this.options.classes.stick+"(\\s|$)*","g"),""),this.clonedElem.className+=" "+this.options.classes.unstick,this.visible=!1,this.options.onUnstick.call(this))},update:function(){l()>this.scrollOffset?this.stick():this.unstick()}},t.Headhesive=c}(window,document);
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