Is it possible to listen for changes to an object's attributes in JavaScript?

Question

I\'m working on a fiddly web interface which is mostly built with JavaScript. Its basically one (very) large form with many sections. Each section is built based on options

Answer 1

jQuery is just amazing. Although you could take a look to ASP.NET AJAX Preview.

Some features are just .js files, no dependency with .NET. May be you could find usefull the observer pattern implementation.

var o = { foo: "Change this string" };

Sys.Observer.observe(o);

o.add_propertyChanged(function(sender, args) {
    var name = args.get_propertyName();
    alert("Property '" + name + "' was changed to '" + sender[name] + "'.");
});

o.setValue("foo", "New string value.");

Also, Client Side templates are ready to use for some interesting scenarios.

A final note, this is fully compatible with jQuery (not problem with $)

Links: Home page, Version I currently use