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Element: focus event

The focus event fires when an element has received focus. The event does not bubble, but the related focusin event that follows does bubble.

The opposite of focus is the blur event, which fires when the element has lost focus.

The focus event is not cancelable.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js

addEventListener("focus", (event) => {});

onfocus = (event) => {};

Event type

A FocusEvent. Inherits from Event.

Event UIEvent FocusEvent

Event properties

This interface also inherits properties from its parent UIEvent, and indirectly from Event.

FocusEvent.relatedTarget

The element losing focus, if any.

Examples

Simple example

HTML

html

<form id="form">
  <label>
    Some text:
    <input type="text" placeholder="text input" />
  </label>
  <label>
    Password:
    <input type="password" placeholder="password" />
  </label>
</form>

JavaScript

js

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

password.addEventListener("focus", (event) => {
  event.target.style.background = "pink";
});

password.addEventListener("blur", (event) => {
  event.target.style.background = "";
});

Result

Event delegation

There are two ways of implementing event delegation for this event: by using the focusin event, or by setting the useCapture parameter of addEventListener() to true.

HTML

html

<form id="form">
  <label>
    Some text:
    <input type="text" placeholder="text input" />
  </label>
  <label>
    Password:
    <input type="password" placeholder="password" />
  </label>
</form>

JavaScript

js

const form = document.getElementById("form");

form.addEventListener(
  "focus",
  (event) => {
    event.target.style.background = "pink";
  },
  true,
);

form.addEventListener(
  "blur",
  (event) => {
    event.target.style.background = "";
  },
  true,
);

Result

Specifications

Specification
UI Events
# event-type-focus
HTML Standard
# handler-onfocus

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
focus_event 1 12 24
6–24The interface for this event is Event, not FocusEvent.
 9 11.6 3.1 4.4 18 24
6–24The interface for this event is Event, not FocusEvent.
 12.1 2 1.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Element/focus_event