IE doesn't get an event.which property when fixing click events

[larholm]

When you leftclick in IE any assigned click handlers will never have a "which" property on their event objects, despite having been through jQuery.event.fix().

The code in question is the following:

Add which for click: 1 == left; 2 == middle; 3 == right Note: button is not normalized, so don't use it if ( !event.which && event.button )

event.which = (event.button & 1 ? 1 : ( event.button & 2 ? 3 : ( event.button & 4 ? 2 : 0 ) ));

Since leftclicking sets the button property to 0 the above will never be triggered in IE, and IE will not get a which property on click events.

[dmethvin]

So it sounds like the fix is something like:

   if ( !event.which && event.button!=undefined )

[jpsimons]

Yeah surprising this bug is still around. event.which should be a reliable way to get the mouse button but it's currently returning "undefined" for the left mouse button.

[brandon]

Unfortunately the event.button property is not set for click events. It is however set for mouseup/down/move ... but not click.