scrollnav/dist/scrollnav.min.mjs

A small, dependency free JavaScript plugin for auto generating single page navigation

function f(f,h){var y,E={};for(y in f)Object.prototype.hasOwnProperty.call(f,y)&&(E[y]=f[y]);for(y in h)Object.prototype.hasOwnProperty.call(h,y)&&(E[y]=h[y]);return E}function h(f,h){if("object"!=typeof f)return Promise.reject(new Error("First argument must be an object"));if("object"!=typeof(h=h||document.body))return Promise.reject(new Error("Second argument must be an object"));var y=h.getBoundingClientRect();return f.getBoundingClientRect().top-y.top}function y(f,E,w){void 0===w&&(w="scroll-nav");var L=[];return w+="__",f.forEach(function(f,O){var x=[],j=function(f,h){if("object"!=typeof f)return Promise.reject(new Error("First argument must be an object"));var y=f.id;if(!y){if("string"!=typeof h)return Promise.reject(new Error("Second argument must be a string"));f.id=y=h}return y}(f,w+(O+1));E.subSections&&f.matches(E.sections)&&(x=y(function(f,h,y){var E=[];for(f=f.nextElementSibling;f&&!f.matches(h);)!y||f.matches(y)?(E.push(f),f=f.nextElementSibling):f=f.nextElementSibling;return E}(f,E.sections,E.subSections),E,j));L.push({id:j,text:f.innerText||f.textContent,offsetTop:h(f),subSections:x})}),L}function E(f){var h=document.createElement("nav");return h.className="scroll-nav",h.innerHTML=function f(h,y){void 0===y&&(y=!1);var E="scroll-nav"+(y?"__sub-":"__"),w="\n    "+h.map(function(h){return'<li class="'+E+'item" data-sn-section="'+h.id+'">\n            <a class="'+E+'link" href="#'+h.id+'">'+h.text+"</a>\n            "+(h.subSections&&h.subSections.length?""+f(h.subSections,!0):"")+"\n          </li>"}).join("")+"\n  ";return'\n    <ol class="'+E+'list">\n      '+w+"\n    </ol>\n  "}(f),h}function w(f){return f.forEach(function(f){var y=document.querySelector("#"+f.id);f.offsetTop=h(y),f.subSections.length&&(f.subSections=w(f.subSections))}),f}function L(f,h){var y=f.getAttribute("href");return"#"===y.charAt(0)&&(y=y.substr(1)),function f(h,y){var E;h.forEach(function(h){h.id===y&&(E=h),h.subSections&&void 0===E&&(E=f(h.subSections,y))});return E}(h,y).offsetTop}var O,x,j,_=function(f){return function(h){return Math.pow(h,f)}},M=function(f){return function(h){return 1-Math.abs(Math.pow(h-1,f))}},I=function(f){return function(h){return h<.5?_(f)(2*h)/2:M(f)(2*h-1)/2+.5}},Q={linear:I(1),easeInQuad:_(2),easeOutQuad:M(2),easeInOutQuad:I(2),easeInCubic:_(3),easeOutCubic:M(3),easeInOutCubic:I(3),easeInQuart:_(4),easeOutQuart:M(4),easeInOutQuart:I(4),easeInQuint:_(5),easeOutQuint:M(5),easeInOutQuint:I(5)};function C(f,h){return new Promise(function(y,E){if("number"!=typeof f)return E(new Error("First argument must be a number"));if("string"!=typeof(h=h||"linear"))return E(new Error("Second argument must be a string"));var w,L=window.pageYOffset,O=f-L,x=function(f){var h=Math.abs(f/2);return Math.min(Math.max(h,250),1200)}(O),j=20,_=0;!function f(){w=Q[h]((_+=j)/x),window.scroll(0,w*O+L),_<x?setTimeout(f,j):y(window.pageYOffset)}()})}function q(f){function h(){var h=window.scrollY||window.pageYOffset||document.body.scrollTop,y=h+.4*window.innerHeight,E=function f(h,y,E){var w,L;h.forEach(function(f){f.offsetTop>E?!w&&f.offsetTop<y&&(w=f):w=f}),w&&w.subSections.length&&(L=f(w.subSections,y,E))&&(w=L);return w}(f.data,h,y);return function(f,h){var y=h.querySelector("[data-sn-active]");if(f){var E=h.querySelector("[data-sn-section="+f.id+"]");E&&E!==y&&(y&&(y.classList.remove("scroll-nav__item--active"),y.removeAttribute("data-sn-active")),E.classList.add("scroll-nav__item--active"),E.setAttribute("data-sn-active",!0))}else y&&(y.classList.remove("scroll-nav__item--active"),y.removeAttribute("data-sn-active"))}(E,f.nav),E}return window.addEventListener("scroll",h),h}function B(f){return f instanceof Element}Element.prototype.matches||(Element.prototype.matches=Element.prototype.msMatchesSelector||Element.prototype.webkitMatchesSelector);export default{init:function(h,_){if(this.settings=f({sections:"h2",insertTarget:h,insertLocation:"before",easingStyle:"easeOutQuad",updateHistory:!0},_),B(h))if(!this.settings.insertTarget||B(this.settings.insertTarget))if(["append","prepend","after","before"].includes(this.settings.insertLocation)){var M,I,Q,F,R=h.querySelectorAll(this.settings.sections);if(R.length)return this.data=y(R,this.settings),this.nav=E(this.data),I=(M=this).settings.insertTarget,"append"===(Q=M.settings.insertLocation)?I.appendChild(M.nav):"prepend"===Q?I.insertBefore(M.nav,I.firstChild):"before"===Q?I.parentNode.insertBefore(M.nav,I):"after"===Q&&I.parentNode.insertBefore(M.nav,I.nextSibling),O=function(f){var h=f.settings;function y(y){y.preventDefault();var E=.39*window.innerHeight;return C(L(y.target,f.data)-E,h.easingStyle).then(function(){h.updateHistory&&history.replaceState({},"",y.target.getAttribute("href")),h.onScroll&&h.onScroll()})}return f.nav.querySelectorAll("a").forEach(function(f){f.addEventListener("click",y)}),y}(this),x=q(this),j=function(f){function h(){f.data=w(f.data)}return window.addEventListener("resize",h),h}(this),this.settings.debug&&((F=document.createElement("div")).className="snDebugger",F.setAttribute("style","\n      position: fixed;\n      top: 40%;\n      height: 0px;\n      border-bottom:5px solid red;\n      border-top: 5px solid blue;\n      width: 100%;\n      opacity: .5;\n      pointer-events: none;\n    "),document.body.appendChild(F)),this.settings.onInit?this.settings.onInit():void 0;this.settings.debug&&console.error('\n        scrollnav build failed, could not find any "'+this.settings.sections+'"\n        elements inside of "'+h+'"\n      ')}else this.settings.debug&&console.error('\n        scrollnav build failed, options.insertLocation "'+this.settings.insertLocation+'" is not a valid option\n      ');else this.settings.debug&&console.error('\n        scrollnav build failed, options.insertTarget "'+h+'" is not an HTML Element\n      ');else this.settings.debug&&console.error('\n        scrollnav build failed, content argument "'+h+'" is not an HTML Element\n      ')},destroy:function(h){if(this.settings=f(this.settings,h),function(f,h){f.querySelectorAll("a").forEach(function(f){f.removeEventListener("click",h)})}(this.nav,O),function(f){window.removeEventListener("scroll",f)}(x),function(f){window.removeEventListener("resize",f)}(j),this.nav.remove(),this.settings.onDestroy)return this.settings.onDestroy()},updatePositions:function(h){if(this.settings=f(this.settings,h),this.data=w(this.data),this.settings.onUpdatePositions)return this.settings.onUpdatePositions()}};
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