document.observe('dom:loaded', function() {

Question

Is there a way to have this prototype js trigger only when dom is changed and not loaded?

Answer 1

The 'change' method is defined only for 'input', 'textarea' and select elements, not for general elements.

The "dom:loaded" event is a user-defined event (as far as the browser is concerned) defined by the Prototype library. I don't believe that it is usable as any kind of template for a dom:changed event.

What you are looking for are DOM mutation events, such as DomSubtreeModified (see 1). But I don't believe these are widely supported in browsers yet.