Gallery

<script src="http://yui.yahooapis.com/3.3.0/build/yui/yui-min.js"></script>

YUI({
    //Last Gallery Build of this module
    gallery: 'gallery-2011.03.09-21-14'
}).use('event-custom', 'gallery-patch-330-event-preventedfn', function(Y) {
 
    // Create two EventTargets (typically, these will be class instances that inherit from EventTarget
    var a = new Y.EventTarget({ emitFacade: true, prefix: 'a' }),
        b = new Y.EventTarget({ emitFacade: true, prefix: 'b', bubbles: true });
 
    // Events from b will bubble to a, allowing a.on('b:foo', fn)
    b.addTarget(a);
 
    // The child publishes an event with a preventedFn, so when e.preventDefault() is called from a
    // subscriber, this function should execute instead of the defaultFn
    b.publish('foo', {
        defaultFn: function () { Y.log('default'); },
        preventedFn: function () { Y.log('prevented'); }
    });
 
    // Set up event subscribers to every phase of the event lifecycle
    b.on('foo', function () { Y.log('b on foo'); });
    b.after('foo', function () { Y.log('b after foo'); });
    a.on('b:foo', function () { Y.log('a on foo'); });
    a.after('b:foo', function () { Y.log('a after foo'); });
 
    // If the event is not prevented, the following messages should be logged in order:
    // b on foo
    // a on foo
    // default
    // a after foo
    // b after foo
 
    // Preventing the event from a bubble target subscriber should trigger the preventedFn.
    // This is not happening in 3.3.0 without this patch
    a.on('b:foo', function (e) { e.preventDefault(); });
 
    b.fire('foo');
 
    // output before (notice no defaultFn, but also no preventedFn):
    // b on foo
    // a on foo
 
    // output with patch
    // b on foo
    // a on foo
    // prevented
 
});