Get the previous selectable item. It selects the last item if no item is active or if the first item is active. It returns null if no previous item is selectable.

$(function () {
    var returnsValue; // Type:  any
    // Parameters
    var event; // Type:  event
    
    returnsValue = $(".selector").wijmenu("previous", event);
});

function previous( 
   event : event
) : any;