Hacker News: reading progress bar
Shows a thin bar at the top indicating how far through a long comment thread you have scrolled.
Code to copy
// Show a reading-progress bar at the top of long threads
(function () {
if (document.getElementById('jz-hn-progress')) { return; }
const bar = document.createElement('div');
bar.id = 'jz-hn-progress';
bar.style.cssText = 'position:fixed;top:0;left:0;height:4px;width:0;' +
'background:#ff6600;z-index:99999;transition:width 0.1s ease-out;';
document.body.appendChild(bar);
function update() {
const doc = document.documentElement;
const max = doc.scrollHeight - doc.clientHeight;
const pct = max > 0 ? (window.scrollY / max) * 100 : 0;
bar.style.width = pct + '%';
}
window.addEventListener('scroll', update);
window.addEventListener('resize', update);
update();
})();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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