GlobalEventHandlers.onkeyup - Web APIs 编辑

The onkeyup property of the GlobalEventHandlers mixin is an EventHandler 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

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, also see keydown and keyup events are now fired during IME composition for more useful details). 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

• keyup event
• Related event handlers
  • GlobalEventHandlers.onkeydown
  • GlobalEventHandlers.onkeypress