GlobalEventHandlers.onfocus
The onfocus
property of the
GlobalEventHandlers
mixin is an event handler 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
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 |
---|
HTML Standard # handler-onfocus |
Browser compatibility
BCD tables only load in the browser
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