Element: focus event
The focus
event fires when an element has received focus. The main difference between this event and focusin
is that focusin
bubbles while focus
does not.
The opposite of focus
is blur
.
This event is not cancelable and does not bubble.
Syntax
Use the event name in methods like addEventListener()
, or set an event handler property.
addEventListener('focus', event => { });
onfocus = event => { };
Event type
An FocusEvent
. Inherits from Event
.
Event properties
This interface also inherits properties from its parent UIEvent
, and indirectly from Event
.
-
An
EventTarget
representing a secondary target for this event. In some cases (such as when tabbing in or out a page), this property may be set tonull
for security reasons.
Examples
Simple example
HTML
<form id="form">
<input type="text" placeholder="text input">
<input type="password" placeholder="password">
</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
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">
<input type="text" placeholder="text input">
<input type="password" placeholder="password">
</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
Specifications
Specification |
---|
UI Events # event-type-focus |
Browser compatibility
BCD tables only load in the browser
See also
- Related events:
blur
,focusin
,focusout
- This event on
Window
targets:focus
event - Focusing: focus/blur