HTML compositionend DOM Event: Reference and Examples

When someone interacts with a webpage, the browser sends events to the relevant JavaScript code. The compositionend event happens when an input method editor finishes composing text.

When compositionend happens

An input method editor finishes composing text.

You can listen for it using addEventListener(). That keeps event handling separate from HTML attributes such as onclick and works well with modern code organization.

A small working example

<label for="demo-target">Try the input</label>
<input id="demo-target" name="sample" type="text" required>
<p id="event-status" role="status">Waiting for compositionend...</p>
<script>
    const eventTarget = document.getElementById("demo-target");
    const eventStatus = document.getElementById("event-status");

    if (eventTarget) {
        eventTarget.addEventListener("compositionend", (eventDetails) => {
            eventStatus.textContent = "compositionend event received";
            console.log(eventDetails.type, eventDetails.target);
        });
    }
</script>

Reading the code

The browser listens for compositionend on the relevant target. When the event occurs, the callback receives eventDetails, updates the status message and logs the event name and target in Developer Tools.

Type with an IME for languages requiring composition.

The form example is for learning. HTML constraint validation is helpful feedback, but the server must still validate submitted values and handle requests safely.

Try it in your browser

Open the page, show the Console panel, and follow this test: Type with an IME for languages requiring composition. Then change one thing in the example and observe whether the event still fires.

Common Beginner Mistakes

• Expecting compositionend to fire without its required user action or browser condition.
• Type with an IME for languages requiring composition.
• Adding repeated event listeners without considering cleanup or unwanted side effects.

Key Takeaways

• compositionend reports an input method editor finishes composing text.
• addEventListener("compositionend", ...) listens for the event on the appropriate target.
• Type with an IME for languages requiring composition.