MouseEvent altKey Property
Example
Find out whether or not the "ALT" key was pressed when a mouse button is clicked:
if (event.altKey) {
alert("The ALT key was pressed!");
} else {
alert("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 mouse 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 mouse event occured.
Possible values:
|
|---|---|
| DOM Version: | DOM Level 2 Events |
Related Pages
HTML DOM reference: MouseEvent ctrlKey Property
HTML DOM reference: MouseEvent metaKey Property
HTML DOM reference: MouseEvent shiftKey Property
