diff options
Diffstat (limited to 'static/js/pager.ts')
-rw-r--r-- | static/js/pager.ts | 107 |
1 files changed, 65 insertions, 42 deletions
diff --git a/static/js/pager.ts b/static/js/pager.ts index 01d40d7..ebaf67a 100644 --- a/static/js/pager.ts +++ b/static/js/pager.ts @@ -4,44 +4,60 @@ if (cookiesDisabled) { document.cookie = "disabled"; document.cookie.indexOf("disabled"); - return console.log("Pager is disabled due to cookie restrictions."); + return console.warn("WARNING: Pager disabled due to cookie restrictions"); } - let settings = { pager: {} }; + let seek; + let pager = {}; - const url = self.location.href.split("#")[0].split("?")[0]; + const state = "on"; + const key = "config.scroll.pager.urls"; - const scrollRestore = (url) => { - if (history.scrollRestoration) history.scrollRestoration = "manual"; - if (localStorage["settings"]) { - settings = JSON.parse(localStorage["settings"]); - } - const fragment = document.getElementById(location.hash.slice(1)); - const fragmentInURL = self.location.hash.length > 0; - if (fragmentInURL && document.body.contains(fragment)) { - settings["pager"][url] = self.pageYOffset; - localStorage["settings"] = JSON.stringify(settings); - fragment.scrollIntoView(); - self.addEventListener("load", function () { - fragment.scrollIntoView(); - }); - return; - } - if (settings["pager"][url] > 0) { - self.scrollTo(0, settings["pager"][url]); - return; + if (!localStorage[key]) localStorage[key] = JSON.stringify(pager); + + let url = function () { return self.location.href.split("#")[0].split("?")[0]; }; + + const scrollHash = function (url) { + 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 ("scroll-margin-top" in document.body.style === false && fragment.textContent !== "") { + self.scrollBy(0, -6 * parseFloat(getComputedStyle(document.documentElement).fontSize)); + } } - settings["pager"][url] = self.pageYOffset; - localStorage["settings"] = JSON.stringify(settings); + return hashed; }; - const scrollTrack = (url) => { + 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; - settings["pager"][url] = currentPosition; - localStorage["settings"] = JSON.stringify(settings); + pager = JSON.parse(localStorage[key]); + pager[url] = currentPosition; + localStorage[key] = JSON.stringify(pager); }; - const backTrack = (back, up, event) => { + const scrollReverse = function (back, up, event) { if (document.body.contains(up) && up.contains(event.target)) { event.preventDefault(); window.scrollTo(0, 0); @@ -53,20 +69,27 @@ } }; - self.addEventListener("DOMContentLoaded", function () { - scrollRestore(url); - self.addEventListener("click", function (event) { - const up = document.getElementById("top"); - const back = document.getElementById("back"); - backTrack(back, up, event); - }); - }); - - self.addEventListener("scroll", function () { - scrollTrack(url); - }); + ["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); + }); + } + scrollRestore(url()); + }); + }, + ); - self.addEventListener("hashchange", function () { - scrollRestore(url); + ["click", "touchstart", "scroll"].forEach(function (event) { + self.addEventListener(event, function () { + scrollTrack(url()); + }); }); })(); |