Stack Overflow: J/K keyboard answer navigation
Lets the J and K keys jump sequentially between answers so you can read without reaching for the mouse.
Code to copy
/* Use J / K keys to jump between answers */
(function () {
var idx = -1;
function answers() {
return Array.prototype.slice.call(document.querySelectorAll('#answers .answer'));
}
document.addEventListener('keydown', function (e) {
if (e.ctrlKey || e.altKey || e.metaKey) return;
var tag = (e.target.tagName || '').toLowerCase();
if (tag === 'input' || tag === 'textarea' || e.target.isContentEditable) return;
var list = answers();
if (!list.length) return;
if (e.key === 'j') { idx = Math.min(idx + 1, list.length - 1); }
else if (e.key === 'k') { idx = Math.max(idx - 1, 0); }
else { return; }
list[idx].scrollIntoView({ behavior: 'smooth', block: 'start' });
e.preventDefault();
});
})();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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