60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
(function () {
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var content = document.querySelector("main");
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if (!content) return;
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var headings = content.querySelectorAll("h1, h2, h3");
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if (headings.length < 2) return;
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var nav = document.createElement("nav");
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nav.className = "toc";
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var header = document.createElement("div");
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header.className = "panel-header";
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header.textContent = "Contents";
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nav.appendChild(header);
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var list = document.createElement("ul");
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headings.forEach(function (h) {
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if (!h.id) return;
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var li = document.createElement("li");
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li.className = "toc-" + h.tagName.toLowerCase();
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var a = document.createElement("a");
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a.href = "#" + h.id;
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var clone = h.cloneNode(true);
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clone.querySelectorAll(".btn, .muted").forEach(function (el) { el.remove(); });
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a.textContent = clone.textContent.trim();
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li.appendChild(a);
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list.appendChild(li);
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});
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nav.appendChild(list);
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var toggle = document.createElement("button");
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toggle.type = "button";
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toggle.className = "panel-toggle";
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toggle.textContent = "Contents";
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toggle.setAttribute("aria-expanded", "false");
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toggle.addEventListener("click", function () {
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var open = nav.classList.toggle("is-open");
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toggle.setAttribute("aria-expanded", open ? "true" : "false");
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});
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var main = document.querySelector("main");
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if (main) {
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main.parentNode.insertBefore(toggle, main);
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main.parentNode.insertBefore(nav, main);
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} else {
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document.body.appendChild(toggle);
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document.body.appendChild(nav);
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}
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var pageHeader = document.querySelector("header");
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function updateTop() {
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if (!pageHeader || getComputedStyle(nav).position !== "fixed") return;
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var rect = pageHeader.getBoundingClientRect();
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nav.style.top = Math.max(8, rect.bottom + 8) + "px";
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}
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window.addEventListener("scroll", updateTop, { passive: true });
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window.addEventListener("resize", updateTop);
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updateTop();
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})();
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