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(function () {
const cookiesDisabled = !navigator.cookieEnabled;
if (cookiesDisabled) {
document.cookie = "disabled";
document.cookie.indexOf("disabled");
return console.warn("WARNING: Pager disabled due to cookie restrictions");
}
let url;
let seek;
let pager = {};
const key = "config.scroll.pager.urls";
if (!localStorage[key]) localStorage[key] = JSON.stringify(pager);
const link = function () { url = self.location.href.split("#")[0].split("?")[0]; };
const scrollHash = function (url, load = false) {
const hash = self.location.hash;
const fragment = hash.slice(1) && document.getElementById(hash.slice(1));
const fragmented = hash.length > 0;
const hashed = fragmented && document.body.contains(fragment);
if (hashed) {
self.location.hash = hash;
self.location.href = hash;
if (load) fragment.scrollIntoView();
}
return hashed;
};
const scrollRestore = function (url) {
if (history.scrollRestoration) history.scrollRestoration = "manual";
if (scrollHash(url)) return;
pager = JSON.parse(localStorage[key]);
if (pager[url] > 0) {
clearInterval(seek);
self.scrollTo(0, pager[url]);
let i = 0; return seek = setInterval(function (position) {
i++; if (i > 100) clearInterval(seek);
if (document.documentElement.scrollHeight >= position + document.documentElement.clientHeight) {
clearInterval(seek); self.scrollTo(0, position);
}
}, 4, pager[url]);
} else self.scrollTo(0, 0);
pager[url] = self.pageYOffset;
localStorage[key] = JSON.stringify(pager);
};
const scrollTrack = function (url) {
const currentPosition = self.pageYOffset;
pager = JSON.parse(localStorage[key]);
pager[url] = currentPosition;
localStorage[key] = JSON.stringify(pager);
};
const scrollReverse = function (back, up, event) {
if (document.body.contains(up) && up.contains(event.target)) {
event.preventDefault();
window.scrollTo(0, 0);
}
if (document.body.contains(back) && back.contains(event.target)) {
if (history.length < 2) return;
event.preventDefault();
history.go(-1);
}
};
["DOMContentLoaded", "pageshow", "hashchange", "URLChangedCustomEvent"].forEach(
function (event) {
self.addEventListener(event, function (event) {
if (event.type === "pageshow") {
return event.persisted && self.scrollTo(0, pager[url]);
}
if (event.type === "DOMContentLoaded") {
self.addEventListener("click", function (event) {
const up = document.getElementById("top");
const back = document.getElementById("back");
scrollReverse(back, up, event);
});
}
link(); scrollRestore(url);
});
},
);
["click", "touchstart", "scroll"].forEach(function (event) {
self.addEventListener(event, function () {
link(); scrollTrack(url);
});
});
})();
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