jquery.hash-magic.min.js

;(function($,undefined){var
linkList=[],anchorList=[],eventFlag=false;$('a[href^="#"]').each(function(){linkList.push(this);var anchor=$('*[data-anchor="'+$(this).attr('href').replace('#','')+'"]');if(anchor.length>0){anchorList.push(anchor);}});function blockEvent(){eventFlag=true;}
function unblockEvent(){setTimeout(function(){eventFlag=false;},250);}
function isBlockedEvent(){return eventFlag==true;}
function updateLinkClass(hash){$.each(linkList,function(){if(hash==$(this).attr('href')){$(this).addClass('active');}else{$(this).removeClass('active');}});}
function updateWindowPosition(hash){blockEvent();$.each(anchorList,function(){if(hash=='#'+this.data('anchor')){$('html,body').animate({scrollTop:this.offset().top},'250');return false;}});unblockEvent();}
function init(){var hash=window.location.hash;if(hash.length){updateLinkClass(hash);updateWindowPosition(hash);}}
$('a[href^="#"]').click(function(){var hash=$(this).attr('href');window.location.replace(hash);updateLinkClass(hash);updateWindowPosition(hash);});$(document).scroll(function(){if(isBlockedEvent()){return false;}
var windowY=window.pageYOffset;$.each(anchorList,function(){if(windowY<=0){window.location.replace('#top');updateLinkClass('#top');return false;}
var thisTop=this.offset().top;if(windowY-20<thisTop&&thisTop<windowY+20&&window.location.hash!='#'+this.data('anchor')){var hash='#'+this.data('anchor');window.location.replace(hash);updateLinkClass(hash);return false;}});});init();})(jQuery);