event.which : Event Object « Event « JavaScript Tutorial

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JavaScript Tutorial » Event » Event Object 
15. 1. 12. event.which

The which property refers to which key or mouse button was pressed or clicked.

The value returned for mouse events is a numeric value 1, 2, or 3, representing the left, middle, and right mouse buttons, respectively.

The value returned for keyboard events is a character representation for the key that was pressed.

<html>
    <head>
    <title>Using the which property of the event object</title>
    </head>
    <body>
    <form>
    This example uses the which property of the event object to determine
    which mouse button is pressed.
    <br><br>
    <input type="radio" onClick = 'alert("Mouse button Number " + event.which + "was pressed.")'>
    </form>
    </body>
    </html>
15. 1. Event Object
15. 1. 1. Event
15. 1. 2. event.data
15. 1. 3. event.height
15. 1. 4. event.layerX
15. 1. 5. event.layerY
15. 1. 6. event.pageX
15. 1. 7. event.pageY
15. 1. 8. event.screenX
15. 1. 9. event.screenY
15. 1. 10. event.target
15. 1. 11. event.type
15. 1. 12. event.which
15. 1. 13. event.width
15. 1. 14. Event.ABORT
15. 1. 15. Event.CHANGE
15. 1. 16. Add event handler to form
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