The onfocus
property of the GlobalEventHandlers
mixin is an EventHandler
that processes focus
events on the given element.
The focus
event is raised when the user sets focus on an element.
For onfocus
to fire on non-input elements, they must be given the tabindex
attribute (see Building keyboard accessibility back in for more details).
Note: The opposite of onfocus
is onblur
.
Syntax
target.onfocus = functionRef;
Value
functionRef
is a function name or a function expression. The function receives a FocusEvent
object as its sole argument.
Example
This example uses onblur
and onfocus
to change the text within an <input>
element.
HTML
<input type="text" value="CLICK HERE">
JavaScript
let input = document.querySelector('input');
input.onblur = inputBlur;
input.onfocus = inputFocus;
function inputBlur() {
input.value = 'Focus has been lost';
}
function inputFocus() {
input.value = 'Focus is here';
}
Result
Try clicking in and out of the form field, and watch its contents change accordingly.
Specifications
Specification | Status | Comment |
HTML Living StandardThe definition of 'onfocus' in that specification. | Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
onfocus
|
Chrome
Full support Yes |
Edge
Full support 12 |
Firefox
Full support Yes |
IE
Full support Yes |
Opera
Full support Yes |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support Yes |
Firefox Android
Full support Yes |
Opera Android
Full support Yes |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support Yes |
Legend
- Full support
- Full support
In contrast to IE, in which almost all kinds of elements receive the focus
event, almost all kinds of elements on Gecko browsers do NOT work with this event.
See also
focus
event- Related event handler:
GlobalEventHandlers.onblur
GlobalEventHandlers.onfocus by Mozilla Contributors is licensed under CC-BY-SA 2.5.