MouseEvent.which
Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The MouseEvent.which
read-only property indicates which
button was pressed on the mouse to trigger the event. The standard alternatives to this
property are MouseEvent.button
and MouseEvent.buttons
.
Syntax
var buttonPressed = instanceOfMouseEvent.which
Return value
A number representing a given button:
0
: No button1
: Left button2
: Middle button (if present)3
: Right button
For a mouse configured for left-handed use, the button actions are reversed. In this case, the values are read from right to left.
Specifications
This is not part of any specification.
Browser compatibility
BCD tables only load in the browser