Add Collapsible/Expandable Side Nav (TOC)

toc.css

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+/* General TOC container */
+#table-of-contents-content {
+    padding-left: 0;
+}
+
+/* Each TOC item */
+#table-of-contents-content .toc-item {
+    list-style: none;
+    padding: 2px 0;
+}
+
+/* Flex container for anchor and toggle */
+#table-of-contents-content .toc-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    width: 100%;
+}
+
+/* Anchor link styling */
+#table-of-contents-content .toc-row a {
+    flex-grow: 1; /* Allow anchor to take available space */
+    text-decoration: none;
+    color: inherit;
+    word-wrap: break-word;
+    white-space: normal;
+}
+
+/* Toggle button styling */
+.toc-toggle {
+    background: transparent;
+    border: none;
+    cursor: pointer;
+    color: inherit;
+    padding: 0 0.5rem;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    flex-shrink: 0; /* Prevent toggle from shrinking */
+}
+
+.toc-toggle:focus {
+    outline: none;
+    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.4);
+    border-radius: 4px;
+}
+
+/* Chevron icon transition */
+.toc-toggle svg {
+    transition: transform 150ms ease-in-out;
+}
+
+/* Rotated state for chevron when collapsed */
+.toc-toggle.rotated svg {
+    transform: rotate(-90deg);
+}

toc.js

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+// This script enhances the Table of Contents (TOC) / right side navigation of Mintliffy by adding collapsible/expandable sections based on header depth.
+// It also fixes issues with incorrect depth values for custom anchor tags and ensures proper indentation and visibility of TOC items.
+// But custom anchor tags are not used anymore in our repository. So that part is not needed anymore.
+
+// toc-fix-v2.js
+(function () {
+    let observer;
+
+    function run() {
+        const toc = document.getElementById('table-of-contents-content');
+        if (!toc || toc.dataset.enhanced === 'true') {
+            return;
+        }
+        toc.dataset.enhanced = 'true';
+
+        // Disconnect the observer while we modify the DOM to prevent infinite loops
+        if (observer) observer.disconnect();
+
+        const items = Array.from(toc.querySelectorAll('.toc-item'));
+
+        // Normalize depths, fix NaN, and set initial styles
+        items.forEach(li => {
+            let depthNum = Number(li.getAttribute('data-depth'));
+            if (!Number.isFinite(depthNum)) {
+                depthNum = 2; // Fix for h4 headers producing NaN
+            }
+            li.dataset.depth = String(depthNum);
+            li.style.display = 'list-item'; // Ensure all items are visible initially
+
+            const a = li.querySelector('a');
+            if (a) {
+                const indentStep = 1; // rem per depth level
+                a.style.marginLeft = `${depthNum * indentStep}rem`;
+            }
+        });
+
+        // Add toggle buttons and functionality
+        items.forEach((li, idx) => {
+            const depth = Number(li.dataset.depth);
+
+            // Detect if this item has children
+            const hasChild = idx + 1 < items.length && Number(items[idx + 1].dataset.depth) > depth;
+            if (!hasChild) return;
+
+            // Prevent adding duplicate toggles if script re-runs
+            if (li.querySelector('.toc-toggle')) return;
+
+            const toggle = document.createElement('button');
+            toggle.type = 'button';
+            toggle.className = 'toc-toggle';
+            toggle.setAttribute('aria-expanded', 'true');
+            toggle.innerHTML = `
+                <svg viewBox="0 0 24 24" width="14" height="14" aria-hidden="true" focusable="false">
+                  <path d="M8.5 10.5 L12 14 L15.5 10.5" stroke="currentColor" stroke-width="1.6" fill="none"
+                        stroke-linecap="round" stroke-linejoin="round"/>
+                </svg>
+              `;
+
+            const anchor = li.querySelector('a');
+            if (anchor) {
+                const wrapper = document.createElement('div');
+                wrapper.className = 'toc-row';
+                // Insert wrapper before the anchor, then move anchor and toggle into it
+                anchor.parentNode.insertBefore(wrapper, anchor);
+                wrapper.appendChild(anchor);
+                wrapper.appendChild(toggle);
+            } else {
+                li.appendChild(toggle);
+            }
+
+            li.dataset.collapsed = 'false';
+
+            toggle.addEventListener('click', e => {
+                e.preventDefault();
+                const isCollapsed = li.dataset.collapsed === 'true';
+
+                // Toggle the state
+                li.dataset.collapsed = String(!isCollapsed);
+                toggle.setAttribute('aria-expanded', String(!isCollapsed));
+                toggle.classList.toggle('rotated', !isCollapsed);
+
+                // Update visibility of all descendant items
+                for (let k = idx + 1; k < items.length; k++) {
+                    const childItem = items[k];
+                    const childDepth = Number(childItem.dataset.depth);
+
+                    if (childDepth <= depth) {
+                        break; // Exited the subtree of the clicked item
+                    }
+
+                    if (!isCollapsed) {
+                        // If we are COLLAPSING, hide all descendants
+                        childItem.style.display = 'none';
+                    } else {
+                        // If we are EXPANDING, only reveal direct children
+                        // Deeper children remain hidden if their own parent is collapsed
+                        if (childDepth === depth + 1) {
+                            childItem.style.display = 'list-item';
+                        }
+                    }
+                }
+            });
+        });
+
+        // Reconnect the observer after DOM modifications are complete
+        if (observer) {
+            observer.observe(document.body, { childList: true, subtree: true });
+        }
+    }
+
+    function init() {
+        run(); // Run on initial load
+
+        // Set up an observer to re-run the script on SPA navigation
+        observer = new MutationObserver((mutations) => {
+            for (const mutation of mutations) {
+                if (mutation.addedNodes.length > 0) {
+                    const toc = document.getElementById('table-of-contents-content');
+                    // If a TOC exists and it hasn't been enhanced yet, run the script
+                    if (toc && !toc.dataset.enhanced) {
+                        run();
+                        break; // Found and processed a new TOC, no need to check other mutations
+                    }
+                }
+            }
+        });
+        observer.observe(document.body, { childList: true, subtree: true });
+    }
+
+    if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', init);
+    } else {
+        init();
+    }
+})();