Table of contents from headings
Builds a floating table of contents from H2 and H3 headings with links to each section.
Code to copy
var heads = document.querySelectorAll('h2, h3');
if (heads.length) {
var box = document.createElement('nav');
box.style.cssText = 'position:fixed;top:60px;right:10px;max-height:70vh;overflow:auto;background:#fff;color:#111;border:1px solid #ccc;padding:8px 12px;font:13px sans-serif;z-index:99999;max-width:240px';
heads.forEach(function (h, i) {
if (!h.id) { h.id = 'nv-toc-' + i; }
var a = document.createElement('a');
a.href = '#' + h.id;
a.textContent = h.textContent.trim();
a.style.cssText = 'display:block;padding:2px 0;color:#006870;text-decoration:none;' + (h.tagName === 'H3' ? 'margin-left:12px' : '');
box.appendChild(a);
});
document.body.appendChild(box);
}How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Paste the code into the rule's JavaScript panel and save — it runs on every page visit.
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