Window: blur event - Web APIs 编辑

The blur event fires when an element has lost focus.

The opposite of blur is focus.

BubblesNo
CancelableNo
InterfaceFocusEvent
Event handler propertyonblur
Sync / AsyncSync
ComposedYes

Examples

Live example

This example changes the appearance of a document when it loses focus. It uses addEventListener() to monitor focus and blur events.

HTML

<p id="log">Click on this document to give it focus.</p>

CSS

.paused {
  background: #ddd;
  color: #555;
}

JavaScript

function pause() {
  document.body.classList.add('paused');
  log.textContent = 'FOCUS LOST!';
}

function play() {
  document.body.classList.remove('paused');
  log.textContent = 'This document has focus. Click outside the document to lose focus.';
}

const log = document.getElementById('log');

window.addEventListener('blur', pause);
window.addEventListener('focus', play);

Result

Specifications

SpecificationStatusComment
UI EventsWorking DraftAdded info that this event is composed.
Document Object Model (DOM) Level 3 Events SpecificationObsoleteInitial definition

Browser compatibility

BCD tables only load in the browser

The value of Document.activeElement varies across browsers while this event is being handled (bug 452307): IE10 sets it to the element that the focus will move to, while Firefox and Chrome often set it to the body of the document.

See also

  • Related event: focus
  • This event on Element targets: blur event

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