https://hashizumen.co.jp/common/js/smooth-scroll.polyfills.js

1/*
2 MIT
3 SmoothScroll v16.1.4 | (c) 2020 Chris Ferdinandi | MIT License | http://github.com/cferdinandi/smooth-scroll */
4(function(global,factory){typeof exports==="object"&&typeof module!=="undefined"?module.exports=factory():typeof define==="function"&&define.amd?define(factory):(global=global||self,global.SmoothScroll=factory())})(this,function(){if(window.Element&&!Element.prototype.closest)Element.prototype.closest=function(s){var matches=(this.document||this.ownerDocument).querySelectorAll(s),i,el=this;do{i=matches.length;while(--i>=0&&matches.item(i)!==el);}while(i<0&&(el=el.parentElement));return el};(function(){if(typeof window.CustomEvent===
5"function")return false;function CustomEvent(event,params){params=params||{bubbles:false,cancelable:false,detail:undefined};var evt=document.createEvent("CustomEvent");evt.initCustomEvent(event,params.bubbles,params.cancelable,params.detail);return evt}CustomEvent.prototype=window.Event.prototype;window.CustomEvent=CustomEvent})();(function(){var lastTime=0;var vendors=["ms","moz","webkit","o"];for(var x=0;x<vendors.length&&!window.requestAnimationFrame;++x){window.requestAnimationFrame=window[vendors[x]+
6"RequestAnimationFrame"];window.cancelAnimationFrame=window[vendors[x]+"CancelAnimationFrame"]||window[vendors[x]+"CancelRequestAnimationFrame"]}if(!window.requestAnimationFrame)window.requestAnimationFrame=function(callback,element){var currTime=(new Date).getTime();var timeToCall=Math.max(0,16-(currTime-lastTime));var id=window.setTimeout(function(){callback(currTime+timeToCall)},timeToCall);lastTime=currTime+timeToCall;return id};if(!window.cancelAnimationFrame)window.cancelAnimationFrame=function(id){clearTimeout(id)}})();
7var defaults={ignore:"[data-scroll-ignore]",header:null,topOnEmptyHash:true,speed:500,speedAsDuration:false,durationMax:null,durationMin:null,clip:true,offset:0,easing:"easeInOutCubic",customEasing:null,updateURL:true,popstate:true,emitEvents:true};var supports=function(){return"querySelector"in document&&"addEventListener"in window&&"requestAnimationFrame"in window&&"closest"in window.Element.prototype};var extend=function(){var merged={};Array.prototype.forEach.call(arguments,function(obj){for(var key in obj){if(!obj.hasOwnProperty(key))return;
8merged[key]=obj[key]}});return merged};var reduceMotion=function(){if("matchMedia"in window&&window.matchMedia("(prefers-reduced-motion)").matches)return true;return false};var getHeight=function(elem){return parseInt(window.getComputedStyle(elem).height,10)};var escapeCharacters=function(id){if(id.charAt(0)==="#")id=id.substr(1);var string=String(id);var length=string.length;var index=-1;var codeUnit;var result="";var firstCodeUnit=string.charCodeAt(0);while(++index<length){codeUnit=string.charCodeAt(index);
9if(codeUnit===0)throw new InvalidCharacterError("Invalid character: the input contains U+0000.");if(codeUnit>=1&&codeUnit<=31||codeUnit==127||index===0&&codeUnit>=48&&codeUnit<=57||index===1&&codeUnit>=48&&codeUnit<=57&&firstCodeUnit===45){result+="\\"+codeUnit.toString(16)+" ";continue}if(codeUnit>=128||codeUnit===45||codeUnit===95||codeUnit>=48&&codeUnit<=57||codeUnit>=65&&codeUnit<=90||codeUnit>=97&&codeUnit<=122){result+=string.charAt(index);continue}result+="\\"+string.charAt(index)}return"#"+
10result};var easingPattern=function(settings,time){var pattern;if(settings.easing==="easeInQuad")pattern=time*time;if(settings.easing==="easeOutQuad")pattern=time*(2-time);if(settings.easing==="easeInOutQuad")pattern=time<.5?2*time*time:-1+(4-2*time)*time;if(settings.easing==="easeInCubic")pattern=time*time*time;if(settings.easing==="easeOutCubic")pattern=--time*time*time+1;if(settings.easing==="easeInOutCubic")pattern=time<.5?4*time*time*time:(time-1)*(2*time-2)*(2*time-2)+1;if(settings.easing===
11"easeInQuart")pattern=time*time*time*time;if(settings.easing==="easeOutQuart")pattern=1- --time*time*time*time;if(settings.easing==="easeInOutQuart")pattern=time<.5?8*time*time*time*time:1-8*--time*time*time*time;if(settings.easing==="easeInQuint")pattern=time*time*time*time*time;if(settings.easing==="easeOutQuint")pattern=1+--time*time*time*time*time;if(settings.easing==="easeInOutQuint")pattern=time<.5?16*time*time*time*time*time:1+16*--time*time*time*time*time;if(!!settings.customEasing)pattern=
12settings.customEasing(time);return pattern||time};var getDocumentHeight=function(){return Math.max(document.body.scrollHeight,document.documentElement.scrollHeight,document.body.offsetHeight,document.documentElement.offsetHeight,document.body.clientHeight,document.documentElement.clientHeight)};var getEndLocation=function(anchor,headerHeight,offset,clip){var location=0;if(anchor.offsetParent){do{location+=anchor.offsetTop;anchor=anchor.offsetParent}while(anchor)}location=Math.max(location-headerHeight-
13offset,0);if(clip)location=Math.min(location,getDocumentHeight()-window.innerHeight);return location};var getHeaderHeight=function(header){return!header?0:getHeight(header)+header.offsetTop};var getSpeed=function(distance,settings){var speed=settings.speedAsDuration?settings.speed:Math.abs(distance/1E3*settings.speed);if(settings.durationMax&&speed>settings.durationMax)return settings.durationMax;if(settings.durationMin&&speed<settings.durationMin)return settings.durationMin;return parseInt(speed,
1410)};

14var setHistory=function(options){if(!history.replaceState||!options.updateURL||history.state)return;var hash=window.location.hash;hash=hash?hash:"";history.replaceState({smoothScroll:JSON.stringify(options),anchor:hash?hash:window.pageYOffset},document.title,hash?hash:window.location.href)};var updateURL=function(anchor,isNum,options){if(isNum)return;if(!history.pushState||!options.updateURL)return;history.pushState({smoothScroll:JSON.stringify(options),anchor:anchor.id},document.title,anchor===
15document.documentElement?"#top":"#"+anchor.id)};var adjustFocus=function(anchor,endLocation,isNum){if(anchor===0)document.body.focus();if(isNum)return;anchor.focus();if(document.activeElement!==anchor){anchor.setAttribute("tabindex","-1");anchor.focus();anchor.style.outline="none"}window.scrollTo(0,endLocation)};var emitEvent=function(type,options,anchor,toggle){if(!options.emitEvents||typeof window.CustomEvent!=="function")return;var event=new CustomEvent(type,{bubbles:true,detail:{anchor:anchor,
16toggle:toggle}});document.dispatchEvent(event)};var SmoothScroll=function(selector,options){var smoothScroll={};var settings,toggle,fixedHeader,animationInterval;smoothScroll.cancelScroll=function(noEvent){cancelAnimationFrame(animationInterval);animationInterval=null;if(noEvent)return;emitEvent("scrollCancel",settings)};smoothScroll.animateScroll=function(anchor,toggle,options){smoothScroll.cancelScroll();var _settings=extend(settings||defaults,options||{});var isNum=Object.prototype.toString.call(anchor)===
17"[object Number]"?true:false;var anchorElem=isNum||!anchor.tagName?null:anchor;if(!isNum&&!anchorElem)return;var startLocation=window.pageYOffset;if(_settings.header&&!fixedHeader)fixedHeader=document.querySelector(_settings.header);var headerHeight=getHeaderHeight(fixedHeader);var endLocation=isNum?anchor:getEndLocation(anchorElem,headerHeight,parseInt(typeof _settings.offset==="function"?_settings.offset(anchor,toggle):_settings.offset,10),_settings.clip);var distance=endLocation-startLocation;
18var documentHeight=getDocumentHeight();var timeLapsed=0;var speed=getSpeed(distance,_settings);var start,percentage,position;var stopAnimateScroll=function(position,endLocation){var currentLocation=window.pageYOffset;if(position==endLocation||currentLocation==endLocation||(startLocation<endLocation&&window.innerHeight+currentLocation)>=documentHeight){smoothScroll.cancelScroll(true);adjustFocus(anchor,endLocation,isNum);emitEvent("scrollStop",_settings,anchor,toggle);start=null;animationInterval=
19null;return true}};var loopAnimateScroll=function(timestamp){if(!start)start=timestamp;timeLapsed+=timestamp-start;percentage=speed===0?0:timeLapsed/speed;percentage=percentage>1?1:percentage;position=startLocation+distance*easingPattern(_settings,percentage);window.scrollTo(0,Math.floor(position));if(!stopAnimateScroll(position,endLocation)){animationInterval=window.requestAnimationFrame(loopAnimateScroll);start=timestamp}};if(window.pageYOffset===0)window.scrollTo(0,0);updateURL(anchor,isNum,_settings);
20if(reduceMotion()){adjustFocus(anchor,Math.floor(endLocation),false);return}emitEvent("scrollStart",_settings,anchor,toggle);smoothScroll.cancelScroll(true);window.requestAnimationFrame(loopAnimateScroll)};var clickHandler=function(event){if(event.defaultPrevented)return;if(event.button!==0||event.metaKey||event.ctrlKey||event.shiftKey)return;if(!("closest"in event.target))return;toggle=event.target.closest(selector);if(!toggle||toggle.tagName.toLowerCase()!=="a"||event.target.closest(settings.ignore))return;
21if(toggle.hostname!==window.location.hostname||toggle.pathname!==window.location.pathname||!/#/.test(toggle.href))return;var hash;try{hash=escapeCharacters(decodeURIComponent(toggle.hash))}catch(e){hash=escapeCharacters(toggle.hash)}var anchor;if(hash==="#"){if(!settings.topOnEmptyHash)return;anchor=document.documentElement}else anchor=document.querySelector(hash);anchor=!anchor&&hash==="#top"?document.documentElement:anchor;if(!anchor)return;event.preventDefault();setHistory(settings);smoothScroll.animateScroll(anchor,
22toggle)};var popstateHandler=function(){if(history.state===null)return;if(!history.state.smoothScroll||history.state.smoothScroll!==JSON.stringify(settings))return;var anchor=history.state.anchor;

22if(typeof anchor==="string"&&anchor){anchor=document.querySelector(escapeCharacters(history.state.anchor));if(!anchor)return}smoothScroll.animateScroll(anchor,null,{updateURL:false})};smoothScroll.destroy=function(){if(!settings)return;document.removeEventListener("click",clickHandler,false);window.removeEventListener("popstate",
23popstateHandler,false);smoothScroll.cancelScroll();settings=null;toggle=null;fixedHeader=null;animationInterval=null};var init=function(){if(!supports())throw"Smooth Scroll: This browser does not support the required JavaScript methods and browser APIs.";smoothScroll.destroy();settings=extend(defaults,options||{});fixedHeader=settings.header?document.querySelector(settings.header):null;document.addEventListener("click",clickHandler,false);if(settings.updateURL&&settings.popstate)window.addEventListener("popstate",
24popstateHandler,false)};init();return smoothScroll};return SmoothScroll});