MouseEvent buttons Property

Which mouse button(s) was pressed?

let value = event.buttons;

Description

The buttons property returns which mouse buttons are pressed when a mouse event occurs.

The buttons property is mostly used with the onmousedown event.

The buttons property is read-only.

event.buttons

Return Value:	A Number. The mouse buttons that were pressed when the mouse event occured. If more than one button is pressed, the values are added. 1 : Left mouse button 2 : Right mouse button 4 : Wheel or middle button 8 : Fourth button (Browser Back) 16 : Fifth button (Browser Forward) For a left-hand configured mouse, the values are reversed.
DOM Version:	DOM Level 3 Events

event.buttons is a DOM Level 3 (2004) feature.

It is fully supported in all modern browsers:


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