GlobalEventHandlers.onkeyup

The onkeyup property of the GlobalEventHandlers mixin is an event handler that processes keyup events.

The keyup event fires when the user releases a key that was previously pressed.

Syntax

target.onkeyup = functionRef;

Value

functionRef is a function name or a function expression. The function receives a KeyboardEvent object as its sole argument.

Example

This example logs the KeyboardEvent.code value whenever you release a key inside the <input> element.

HTML

<input>
<p id="log"></p>

JavaScript

const input = document.querySelector('input');
const log = document.getElementById('log');

input.onkeyup = logKey;

function logKey(e) {
  log.textContent += ` ${e.code}`;
}

Result

Specifications

Specification
HTML Standard (HTML)
# handler-onkeyup

Browser compatibility

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Compatibility notes

Since Firefox 65, the keyup and keydown events are now fired during IME composition, to improve cross-browser compatibility for CJKT users (bug 354358. To ignore all keyup events that are part of composition, do something like this (229 is a special value set for a keyCode relating to an even that has been processed by an IME):

eventTarget.addEventListener("keyup", event => {
  if (event.isComposing || event.keyCode === 229) {
    return;
  }
  // do something
});

See also