How to detect Period (.)
document.addEventListener('keydown', (event) => {
if (event.key === ".") {
// Period (.) was pressed
}
});Use event.key to react to what the key means (it follows the keyboard layout) and event.code for its physical position, for example WASD in games. keyCode and which are deprecated: they still work, but their values differ between browsers and layouts.
How browsers treat Period (.)
Use event.key === "."; the numpad decimal key has code NumpadDecimal and, on some European layouts, types a comma.
In React
<input onKeyDown={(e) => { if (e.key === ".") { /* … */ } }} />JavaScript Keycode FinderPress any key and instantly see every property of the keyboard event, with a copy-ready keydown snippet for shortcuts.
Open the tool Frequently asked questions
What is the keyCode for Period (.)?
190. It’s deprecated, though: use event.key (“. (or > with Shift)”) or event.code (Period) in new code.
What is the difference between event.key and event.code?
event.key is the character or action the key produces with the current layout; event.code is the physical key position, the same on every layout.
Should I use keydown or keypress?
keydown. The keypress event is deprecated and doesn’t fire for keys that don’t produce characters, such as Escape or the arrow keys.