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web api event

Element: focus event

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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.

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

onfocus = (event) => { }

Event type

A FocusEvent. Inherits from UIEvent and Event.

Examples

Simple example

HTML

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

JavaScript

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

Interactive exampleOpen the canonical MDN source to run this embedded demo.

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

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

JavaScript

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

Interactive exampleOpen the canonical MDN source to run this embedded demo.

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.

See also