student/ISIP22-maslennikova/js/jquery.sticky.js

// Sticky Plugin v1.0.0 for jQuery
// =============
// Author: Anthony Garand
// Improvements by German M. Bravo (Kronuz) and Ruud Kamphuis (ruudk)
// Improvements by Leonardo C. Daronco (daronco)
// Created: 2/14/2011
// Date: 2/12/2012
// Website: http://labs.anthonygarand.com/sticky
// Description: Makes an element on the page stick on the screen as you scroll
//       It will only set the 'top' and 'position' of your element, you
//       might need to adjust the width in some cases.

(function($){var defaults={topSpacing:0,bottomSpacing:0,className:'is-sticky',wrapperClassName:'sticky-wrapper',center:false,getWidthFrom:''},$window=$(window),$document=$(document),sticked=[],windowHeight=$window.height(),scroller=function(){var scrollTop=$window.scrollTop(),documentHeight=$document.height(),dwh=documentHeight-windowHeight,extra=(scrollTop>dwh)?dwh-scrollTop:0;for(var i=0;i<sticked.length;i++){var s=sticked[i],elementTop=s.stickyWrapper.offset().top,etse=elementTop-s.topSpacing-extra;if(scrollTop<=etse){if(s.currentTop!==null){s.stickyElement.css('position','').css('top','');s.stickyElement.parent().removeClass(s.className);s.currentTop=null;}}
else{var newTop=documentHeight-s.stickyElement.outerHeight()-s.topSpacing-s.bottomSpacing-scrollTop-extra;if(newTop<0){newTop=newTop+s.topSpacing;}else{newTop=s.topSpacing;}
if(s.currentTop!=newTop){s.stickyElement.css('position','fixed').css('top',newTop);if(typeof s.getWidthFrom!=='undefined'){s.stickyElement.css('width',$(s.getWidthFrom).width());}
s.stickyElement.parent().addClass(s.className);s.currentTop=newTop;}}}},resizer=function(){windowHeight=$window.height();},methods={init:function(options){var o=$.extend(defaults,options);return this.each(function(){var stickyElement=$(this);var stickyId=stickyElement.attr('id');var wrapper=$('<div></div>').attr('id',stickyId+'-sticky-wrapper').addClass(o.wrapperClassName);stickyElement.wrapAll(wrapper);if(o.center){stickyElement.parent().css({width:stickyElement.outerWidth(),marginLeft:"auto",marginRight:"auto"});}
if(stickyElement.css("float")=="right"){stickyElement.css({"float":"none"}).parent().css({"float":"right"});}
var stickyWrapper=stickyElement.parent();stickyWrapper.css('height',stickyElement.outerHeight());sticked.push({topSpacing:o.topSpacing,bottomSpacing:o.bottomSpacing,stickyElement:stickyElement,currentTop:null,stickyWrapper:stickyWrapper,className:o.className,getWidthFrom:o.getWidthFrom});});},update:scroller,unstick:function(options){return this.each(function(){var unstickyElement=$(this);removeIdx=-1;for(var i=0;i<sticked.length;i++)
{if(sticked[i].stickyElement.get(0)==unstickyElement.get(0))
{removeIdx=i;}}
if(removeIdx!=-1)
{sticked.splice(removeIdx,1);unstickyElement.unwrap();unstickyElement.removeAttr('style');}});}};if(window.addEventListener){window.addEventListener('scroll',scroller,false);window.addEventListener('resize',resizer,false);}else if(window.attachEvent){window.attachEvent('onscroll',scroller);window.attachEvent('onresize',resizer);}
$.fn.sticky=function(method){if(methods[method]){return methods[method].apply(this,Array.prototype.slice.call(arguments,1));}else if(typeof method==='object'||!method){return methods.init.apply(this,arguments);}else{$.error('Method '+method+' does not exist on jQuery.sticky');}};$.fn.unstick=function(method){if(methods[method]){return methods[method].apply(this,Array.prototype.slice.call(arguments,1));}else if(typeof method==='object'||!method){return methods.unstick.apply(this,arguments);}else{$.error('Method '+method+' does not exist on jQuery.sticky');}};$(function(){setTimeout(scroller,0);});})(jQuery);