Medium: scroll with J and K keys
Lets you scroll the article down with J and up with K without reaching for the mouse.
Code to copy
// Use J and K keys to scroll the article down and up
(function () {
document.addEventListener('keydown', function (e) {
const t = e.target;
if (t && (t.isContentEditable ||
/^(INPUT|TEXTAREA|SELECT)$/.test(t.tagName))) { return; }
if (e.key === 'j' || e.key === 'J') {
window.scrollBy({ top: window.innerHeight * 0.85, behavior: 'smooth' });
} else if (e.key === 'k' || e.key === 'K') {
window.scrollBy({ top: -window.innerHeight * 0.85, behavior: 'smooth' });
}
});
})();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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