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/* ============================================================================
SillyLaird scroll-to-top (network-wide).
Injected by nginx before </body> on HTML responses across *.sillylaird.ca
(see /etc/nginx/snippets/sillylaird-visit-counter.conf). Also loaded as a
fallback from site.js / nav.js. Runs once (window.__slScrollTopInit).
Shows a fixed "▲ TOP" control after the page has been scrolled, and only
when the document is actually taller than the viewport. Works without the
host page loading site.css (styles come from scroll-to-top.css).
============================================================================ */
(function () {
"use strict";
if (window.__slScrollTopInit) return;
window.__slScrollTopInit = true;
// Embedded forms / comments / changelog iframe: the parent page owns scroll.
try {
if (window.self !== window.top) return;
} catch (_) {
return;
}
var path = location.pathname || "/";
if (/\/(admin|api|login|logout|auth|captcha|relay|meta|submit)(\/|$|\.)/i.test(path)) {
return;
}
if (/\.(xml|json|m3u|pls|css|js|map|ico|png|jpe?g|gif|webp|svg|woff2?|mp3|flac|webm|mp4)(\?|$)/i.test(path)) {
return;
}
var CSS_HREF = "https://www.sillylaird.ca/assets/css/scroll-to-top.css?v=20260821b";
var THRESHOLD = 280;
var MIN_OVERFLOW = 240;
function labelForLang() {
var lang = (document.documentElement.lang || "").toLowerCase();
if (lang.indexOf("ja") === 0) return "先頭へ戻る";
if (lang.indexOf("zh") === 0) return "回到顶部";
return "Scroll to top";
}
function prefersReducedMotion() {
return window.matchMedia && window.matchMedia("(prefers-reduced-motion: reduce)").matches;
}
function scrollY() {
return window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
}
function overflowPx() {
var el = document.scrollingElement || document.documentElement;
return (el ? el.scrollHeight : 0) - (window.innerHeight || 0);
}
function ensureCss() {
var links = document.getElementsByTagName("link");
var i;
for (i = 0; i < links.length; i++) {
if (links[i].rel === "stylesheet" && (links[i].href || "").indexOf("scroll-to-top.css") !== -1) {
return;
}
}
var l = document.createElement("link");
l.rel = "stylesheet";
l.href = CSS_HREF;
document.head.appendChild(l);
}
function ensureTopTarget() {
if (document.getElementById("top")) return;
document.documentElement.id = "top";
}
function dodgeVisitCounter() {
var c = document.getElementById("site-visit-counter");
if (!c) return;
var pos = (c.style && c.style.position) || "";
var computed = window.getComputedStyle ? window.getComputedStyle(c).position : "";
if (pos === "fixed" || computed === "fixed") {
c.setAttribute("data-stt-docked", "1");
// Inline bottom from visit-counter.js wins over the stylesheet, so
// move it here or the two chips sit on top of each other.
c.style.bottom = "4.65rem";
}
}
function ensureButton() {
var existing = document.getElementById("scroll-to-top");
if (existing) return existing;
var a = document.createElement("a");
a.id = "scroll-to-top";
a.className = "scroll-to-top";
a.href = "#top";
var label = labelForLang();
a.setAttribute("aria-label", label);
a.title = label;
var caret = document.createElement("span");
caret.className = "scroll-to-top-caret";
caret.setAttribute("aria-hidden", "true");
caret.appendChild(document.createTextNode("\u25B2"));
var text = document.createElement("span");
text.className = "scroll-to-top-label";
text.setAttribute("aria-hidden", "true");
text.appendChild(document.createTextNode("TOP"));
a.appendChild(caret);
a.appendChild(text);
document.body.appendChild(a);
return a;
}
function goTop(e) {
if (e) e.preventDefault();
if (prefersReducedMotion() || typeof window.scrollTo !== "function") {
if (typeof window.scrollTo === "function") {
window.scrollTo(0, 0);
} else {
document.documentElement.scrollTop = 0;
document.body.scrollTop = 0;
}
return;
}
try {
window.scrollTo({ top: 0, behavior: "smooth" });
} catch (_) {
window.scrollTo(0, 0);
}
}
function init() {
ensureCss();
ensureTopTarget();
var btn = ensureButton();
if (!btn) return;
document.body.className = (document.body.className ? document.body.className + " " : "") + "has-scroll-to-top";
dodgeVisitCounter();
window.setTimeout(dodgeVisitCounter, 50);
window.setTimeout(dodgeVisitCounter, 400);
var ticking = false;
function update() {
ticking = false;
var show = overflowPx() > MIN_OVERFLOW && scrollY() > THRESHOLD;
if (show) {
if (btn.className.indexOf("is-visible") === -1) {
btn.className += " is-visible";
}
} else {
btn.className = btn.className.replace(/\s*is-visible\b/g, "");
}
}
function onScroll() {
if (ticking) return;
ticking = true;
if (window.requestAnimationFrame) {
window.requestAnimationFrame(update);
} else {
window.setTimeout(update, 16);
}
}
window.addEventListener("scroll", onScroll, false);
window.addEventListener("resize", onScroll, false);
btn.addEventListener("click", goTop);
update();
}
if (document.readyState === "loading") {
document.addEventListener("DOMContentLoaded", init);
} else {
init();
}
})();
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