Element: compositionstart event

The compositionstart event is fired when a text composition system such as an input method editor starts a new composition session.

For example, this event could be fired after a user starts entering a Chinese character using a Pinyin IME.

Bubbles Yes
Cancelable Yes
Interface CompositionEvent
Event handler property None


const inputElement = document.querySelector('input[type="text"]');

inputElement.addEventListener('compositionstart', (event) => {
  console.log(`generated characters were: ${event.data}`);

Live example


<div class="control">
  <label for="name">First select textbox, then to open IME:<ul><li>on macOS type <kbd>option</kbd> + <kbd>`</kbd></li><li>on Windows type <kbd>windows</kbd> + <kbd>.</kbd></li></ul></label>
  <input type="text" id="example" name="example">

<div class="event-log">
  <label>Event log:</label>
  <textarea readonly class="event-log-contents" rows="8" cols="25"></textarea>
  <button class="clear-log">Clear</button>


const inputElement = document.querySelector('input[type="text"]');
const log = document.querySelector('.event-log-contents');
const clearLog = document.querySelector('.clear-log');

clearLog.addEventListener('click', () => {
    log.textContent = '';

function handleEvent(event) {
    log.textContent = log.textContent + `${event.type}: ${event.data}\n`;

inputElement.addEventListener('compositionstart', handleEvent);
inputElement.addEventListener('compositionupdate', handleEvent);
inputElement.addEventListener('compositionend', handleEvent);



UI Events
# event-type-compositionstart

Browser compatibility

BCD tables only load in the browser

See also