event-handler.js

/**
 * Adds a method to the Y.Base prototype to handle events so that when a widget
 * or plugin becomes destroyed all events attached are detached.
 *
 * Requires Y.Lang & Y.Array
 */
YUI.add('event-handler', function(Y) {

    Y.Plugin.EventManager = Y.Base.create('eventManager', Y.Base, [], {
        initializer: function () {
            this._subs = [];
            this.get('host').on('destroy', this.clean);
        },
        register: function (sub) {
            if (Y.Lang.isArray(sub)) {
                Y.Array.each(sub, this.register, this);
            } else if (sub.detach) {
                this._subs.push(sub);
            }

            return this;
        },
        clean: function () {
            new Y.EventHandle(this._subs).detach();
        }
    }, {
        NS: 'events'
    });

    Y.Base.ATTRS.monitorEvents = {
        setter: function (val) {
            var method = (val) ? 'plug' : 'unplug';
            this[method](Y.Plugin.EventManager);
        }
    };
}, '0.1', { requires: ['plugin'] });

gistfile2.js

-= To Use Within Widget Or Plugin=-
var thing = new Y.BaseDerivedClass({
    monitorEvents: true,
    ...
});


-=To Add=-
            this.events.register([
                Y.one('window').on('resize', function, this),
                Y.one('#loginform').on('submit', function, this)
            ]);

-=OR=-

            this.events.register(
                Y.one('#loginform').on('submit', this._formSubmit, this)
            );

-=To Destroy=-

            this.destroy();

-=OR=-

            this.events.clean();