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
.
Bubbles | No |
---|---|
Cancelable | No |
Interface | FocusEvent |
Event handler property | onfocus |
Sync / Async | Sync |
Composed | Yes |
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 | Status | Comment |
---|---|---|
UI Events | Working Draft | Added info that this event is composed. |
Document Object Model (DOM) Level 3 Events Specification | Obsolete | Initial definition |
Browser compatibility
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