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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 seek;
let settings = { pager: {} };
const key = "settings";
const url = self.location.href.split("#")[0].split("?")[0];
if (!localStorage[key]) localStorage[key] = JSON.stringify(settings);
const scrollRestore = function (url) {
if (history.scrollRestoration) history.scrollRestoration = "manual";
settings = JSON.parse(localStorage[key]);
const hash = self.location.hash;
const fragment = hash.slice(1) && document.getElementById(hash.slice(1));
const fragmentInURL = hash.length > 0;
if (fragmentInURL && document.body.contains(fragment)) {
settings["pager"][url] = self.pageYOffset;
localStorage[key] = JSON.stringify(settings);
fragment.scrollIntoView();
return self.addEventListener("DOMContentLoaded", function () {
fragment.scrollIntoView();
});
}
if (settings["pager"][url] > 0) {
self.scrollTo(0, settings["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, settings["pager"][url]);
}
settings["pager"][url] = self.pageYOffset;
localStorage[key] = JSON.stringify(settings);
};
const scrollTrack = function (url) {
const currentPosition = self.pageYOffset;
settings = JSON.parse(localStorage[key]);
settings["pager"][url] = currentPosition;
localStorage[key] = JSON.stringify(settings);
};
const reverseTrack = 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);
}
};
self.addEventListener("DOMContentLoaded", function () {
self.addEventListener("click", function (event) {
const up = document.getElementById("top");
const back = document.getElementById("back");
reverseTrack(back, up, event);
});
});
["DOMContentLoaded", "pageshow", "hashchange"].forEach(function (event) {
self.addEventListener(event, function (event) {
if (event.type === "pageshow") {
return event.persisted && self.scrollTo(0, settings["pager"][url]);
}
scrollRestore(url);
});
});
["click", "touchstart", "scroll"].forEach(function (event) {
self.addEventListener(event, function () {
scrollTrack(url);
});
});
})();
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