Example
Find out whether or not the "ALT" key was pressed when a keyboard key is pressed:
var x = document.getElementById("demo");
if (event.altKey) {
x.innerHTML = "The ALT key was pressed!";
} else {
x.innerHTML = "The ALT key was NOT pressed!";
}
Try it Yourself »
Definition and Usage
The altKey property returns a Boolean value that indicates whether or not the "ALT" key was pressed when a key event was triggered.
Note: On some Mac keyboards, the "ALT" key is displayed as "Option" or "Opt".
Note: This property is read-only.
Browser Support
| Property | |||||
|---|---|---|---|---|---|
| altKey | Yes | Yes | Yes | Yes | Yes |
Syntax
event.altKey
Technical Details
| Return Value: |
A Boolean, indicating whether the "ALT" key was pressed when the key event occured.
Possible values:
|
|---|---|
| DOM Version: | DOM Level 2 Events |
Related Pages
HTML DOM reference: KeyboardEvent ctrlKey Property
HTML DOM reference: KeyboardEvent metaKey Property
HTML DOM reference: KeyboardEvent shiftKey Property
< Event Object