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    <p>Incorporating Joe's suggestion, this is what I eventually ended up with:</p> <pre><code>function subject() { var callbacks = {} this.register = function(name, callback) { callbacks[name] = callback; } this.unregister = function(name) { delete callbacks[name]; } trigger = function() { var a = arguments; var t = this; $.each(callbacks, function(name, callback) { callback.apply(t, a); }); } } //without the following line, 'this' in firefox is 'subject' instead of 'list' (in chrome it is) list.prototype = new subject() //without these, 'list' is not an instanceof 'subject' list.constructor = subject; list.prototype.constructor = list; function list(n) { this.name = n; subject.call(this); //as suggested by Joe var items = {} this.add = function(name, item) { items[name] = item; trigger.call(this, 'add', name); //no way to do this without using call/apply } this.remove = function(name) { delete items[name]; trigger.call(this, 'remove', name); //no way to do this without using call/apply } this.getitems = function() { return items } } //without the following line, 'this' in firefox is 'subject' instead of 'queue' queue.prototype = new subject() //without these, 'queue' is not an instanceof 'subject' queue.constructor = subject; queue.prototype.constructor = queue; function queue(n) { this.name = n; subject.call(this); //as suggested by Joe var items = []; this.enqueue = function(item) { items.push(item); trigger.call(this, 'enqueue', item); //no way to do this without using call/apply } this.dequeue = function() { var d = items.shift(); trigger.call(this, 'dequeue', d); //no way to do this without using call/apply return d; } this.getitems = function() { return items } } var l1 = new list('l1') l1.register('observer1', function() { console.log('l1', this, arguments) }); l1.add('item1', 'value1'); // ^ 'l1', list { name = 'l1' ... }, ['add', 'item1'] var l2 = new list('l2') l2.register('observer2', function() { console.log('l2', this, arguments) }); l2.add('item2', 'value2'); // ^ 'l2', list { name = 'l2' ... }, ['add', 'item2'] var q1 = new queue('q1') q1.register('observer3', function() { console.log('q1', this, arguments) }); q1.enqueue('item3'); // ^ 'q1', queue { name = 'q1' ... }, ['enqueue', 'item3'] console.log(l1 instanceof list, l1 instanceof subject, l1 instanceof queue); // ^ true, true, false console.log(q1 instanceof list, q1 instanceof subject, q1 instanceof queue); // ^ false, true, true </code></pre> <p>This ticks all of my boxes (except for the use of call, but I can live with that).</p> <p>Thanks for all the help,</p> <p>Mattie</p> <p><strong>EDIT: appearantly this does not work as expected. creating a new object overwrites the other objects callbacks</strong></p>
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