lkarch.org/tools/mathisfun/www.mathsisfun.com/games/a/mahjong/lib/sparouter.js

window.sparouter=(function(){function RootingError(message){this.message=message;this.toString=function(){"The following error occured: "+message;};}
function Sparouter(newurl,oldurl){this.newurl=newurl;this.oldurl=oldurl;this.pagesListeners={};}
Sparouter.prototype.changePage=function(page){this.allPagesInvisible();this.showPage(page);};Sparouter.prototype.showPage=function(page){this.page(page).style.display="block";};Sparouter.prototype.hidePage=function(page){this.page(page).style.display="none";};Sparouter.prototype.page=function(page){return window.document.querySelector("div[data-page="+page+"]");};Sparouter.prototype.allPagesInvisible=function(){var datapages=window.document.querySelectorAll("div[data-page]");for(var i=0;i<datapages.length;i++){datapages[i].style.display="none";}};Sparouter.prototype.onpage=function(page,callback){this.pagesListeners[page]=callback;return this;};Sparouter.prototype.init=function(callback){this.initpage=callback();return this;};Sparouter.prototype.start=function(){var that=this;initRouter();handleLinks();handleBackLinks();function initRouter(){if(this.initpage)
window.location.replace("#"+this.initpage());else
loadDefaultPage();}
function loadDefaultPage(){var pages=window.document.querySelectorAll("div[data-page]");if(pages.length>0){var hash=pages[0].getAttribute("data-page");window.location.replace("#"+hash);}
else
throw new RootingError("No div[data-page] elements exist in the HTML");}
function handleLinks(){var aLinks=window.document.querySelectorAll("a[href^='#']");for(var i=0;i<aLinks.length;i++){new FastButton(aLinks[i],function(e){e.preventDefault();var hash=this.getAttribute("href");var options=this.getAttribute("data-page-options");var effect=this.getAttribute("data-transition-effect");that.goToHash=hash;that.options=options;that.transitionEffect=effect;window.location.hash=hash;});}}
function handleBackLinks(){var backbuttons=window.document.querySelectorAll("a[data-back]");for(var i=0;i<backbuttons.length;i++){addBackButtonListener(backbuttons[i]);}
function addBackButtonListener(backButton){new FastButton(backButton,function(e){e.preventDefault();var options=this.getAttribute("data-page-options");var effect=this.getAttribute("data-transition-effect");var dataBack=backButton.getAttribute("data-back");if(dataBack!==""){var dataBackAsInt=parseInt(dataBack);that.options=options;that.transitionEffect=effect;that.backLinkPressed=true;history.go(dataBackAsInt);}});}}
window.onhashchange=function(event){console.log("onhashchange: ",+document.location+", hash:"+document.location.hash+
", oldurl:"+event.oldURL+", newurl:"+event.newURL+", state: "+JSON.stringify(event.state));event.preventDefault();if(wasBackButtonPressed()){console.log("back button pressed!");var index=event.oldURL.indexOf("#");if(index!==-1){var oldHash=event.oldURL.substring(index+1);var oldpage=window.document.querySelector("div[data-page='"+oldHash+"']");if(oldpage!==null){that.options=oldpage.getAttribute("data-back-options");}}}
that.backLinkPressed=false;changePageOrCallPageListener(document.location.hash.substring(1));function defaultChangePageBehaviorOveridden(hash){return that.pagesListeners[hash];}
function changePageOrCallPageListener(hash){if(defaultChangePageBehaviorOveridden(hash))
callCustomChangePageListener(hash);else
that.changePage(hash);}
function wasBackButtonPressed(){if(that.backLinkPressed===true)
return false;return document.location.hash!==that.goToHash;}
function callCustomChangePageListener(hash){var callbackfunc=that.pagesListeners[hash];var newPage=callbackfunc({hash:hash,effect:null,options:that.options});if(newPage)
that.changePage(newPage);}};};return new Sparouter();}());