MouseEvent button Property

Which mouse button was pressed?

let text = "You pressed button: " + event.button;

Description

The button property returns which mouse button is pressed when a mouse event occurs.

The button property is mostly used with the onmousedown event.

The button property is read-only.

event.button

Return Value:	A Number. Which mouse button that was pressed: 0 : Left button 1 : Wheel or middle button (if present) 2 : Right button For a left-hand configured mouse, the values are reversed.
DOM Version:	DOM Level 2 Events

event.button is a DOM Level 2 (2001) feature.

It is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	9-11