JavaScript MouseEvent button Property

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JavaScript MouseEvent button Property

The event.button property indicates which mouse button was pressed on the mouse to trigger the event.

Note: This property is read-only.

Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <div onmousedown="myFunction(event)"> </div> <script> function myFunction(event){ alert("You pressed button: "+ event.button); } </script> </body> </html>

Syntax

event.button

Return Value

ValueExplanation
0When mouse left button is clicked.
1When mouse middle button is clicked.
2When mouse right button is clicked.

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