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Événements DOM MouseEvent

MouseEvent which attribute

Definition and usage

which attribute returns a number indicating which mouse button was pressed when the mouse event was triggered.

Note :This attribute is mainly used with the onmousedown event. The value returned by this attribute is equal to button attribute

Note :The return value is incremented by one.

This property is read-only.

Example

Find out which mouse button was pressed when the mouse event was triggered:

alert("You pressed button: " + event.which)

Try it yourself

Syntax

Technical details

Return value :

Numeric values representing the mouse button pressed when the mouse event occurs.

Possible values :

  • 0: No button
  • 1: Left mouse button
  • 2: Scroll wheel button or middle button (if any)
  • 3: Right mouse button

Note :For a left-handed mouse configuration, the return value is reversed.
DOM version : DOM Level 2 Events

Compatibilité des navigateurs

Les numéros dans le tableau indiquent la version du navigateur qui prend en charge cette propriété pour la première fois.

Propriétés Chrome IE Firefox Safari Opera
which 1.0 9.0 1.0 1.0 5.0

Pages associées

Manuel de référence DOM HTML :Propriété button de MouseEvent

Manuel de référence DOM HTML :Propriété buttons de MouseEvent

Événements DOM MouseEvent