Hacker News: j/k keyboard navigation
Lets you step between comments and stories with the j and k keys, outlining the current item.
Code to copy
// Navigate between comments with the j and k keys
(function () {
const items = Array.prototype.slice.call(
document.querySelectorAll('.comtr, .athing')
);
if (!items.length) { return; }
let idx = -1;
function focus(n) {
if (n < 0 || n >= items.length) { return; }
idx = n;
const el = items[idx];
el.scrollIntoView({ block: 'center', behavior: 'smooth' });
items.forEach(function (i) { i.style.outline = ''; });
el.style.outline = '2px solid #ff6600';
}
document.addEventListener('keydown', function (e) {
const t = e.target.tagName;
if (t === 'INPUT' || t === 'TEXTAREA') { return; }
if (e.key === 'j') { focus(idx + 1); }
else if (e.key === 'k') { focus(idx - 1); }
});
})();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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