80 lines
2.5 KiB
JavaScript
80 lines
2.5 KiB
JavaScript
for (const el of document.querySelectorAll("[id]")) {
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el.classList.add("haspara");
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const pilcrow = document.createElement("a");
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pilcrow.className = "pilcrow";
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pilcrow.href = "#" + el.id;
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pilcrow.innerHTML = "¶";
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el.prepend(pilcrow);
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}
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const foldable = (root, children) => {
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let state = true;
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root.addEventListener("click", (e) => {
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if (e.target.classList.contains("pilcrow")) state = true;
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else state = !state;
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children.style.height = state ? "auto" : "0";
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children.style.overflow = state ? "visible" : "hidden";
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if (state) root.classList.remove("closed");
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else root.classList.add("closed");
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});
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root.classList.add("toggle-root");
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};
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const make_foldable = (root) => {
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const child_stacks = new Array(10).fill(null).map(() => ({ children: [], root: null }));
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const flush_header = (this_level, sibling) => {
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for (let level = 9; level >= this_level; level--) {
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const stack = child_stacks[level];
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if (!stack.root) continue;
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const new_e = document.createElement("div");
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for (const old_e of stack.children) {
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old_e.remove();
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new_e.appendChild(old_e);
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}
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if (stack.root.tagName !== "H1") foldable(stack.root, new_e);
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let parent_level;
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for (parent_level = level - 1; parent_level > 0; parent_level--) if (child_stacks[parent_level].root) break;
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if (parent_level === -1) {
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if (sibling) root.insertBefore(new_e, sibling);
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else root.appendChild(new_e);
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} else {
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stack.root.remove();
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child_stacks[parent_level].children.push(stack.root);
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child_stacks[parent_level].children.push(new_e);
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}
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stack.root = null;
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stack.children.length = 0;
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}
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};
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for (const child of [...root.children]) {
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if (/^H\d$/.test(child.tagName)) {
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const this_level = parseInt(child.tagName[1]) - 1;
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flush_header(this_level, child);
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child_stacks[this_level].root = child;
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continue;
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}
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for (let level = 9; level >= 0; level--) {
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if (child_stacks[level].root) {
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child_stacks[level].children.push(child);
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break;
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}
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}
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}
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for (let level = 9; level >= 0; level--) {
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flush_header(level, null);
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}
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};
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make_foldable(document.body);
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