Question

Is there a way to assign a multiple event types in MooTools like jQuery?

Mootools:
$$('#id').addEvents({
    keyup: fn,
    click: fn
});

jQuery:
$('#id).bind('keyup click' ,fn);

Answer 1

Yes, there is a way, through the powerful implement:

Element.implement({
    fakeBind : function(evtsStr, callback){
        var events = evtsStr.split(' '), 
            i = 0, 
            l = events.length;
        for (; i < l; i++){
            this.addEvent(events[i], callback);
        }
    }
});

$$('div.myClass').fakeBind('click mouseleave', function(event){
    console.log(event.type);
});

Demo