Rails spinoffs - Nov 2006 - observe_form, observe_field, dynamic forms help

I made a pretty lengthy post on what I''m doing here:
http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/89a2b8e54a874dd9

Short version:

I have a radio_button group of two. If one is clicked another pair of
radio buttons is added, if the other is clicked it is removed.

observe_form does not work for elements added after initial page load.
observe_field does not work for radio_buttons except on the first
''click''

It was suggested that I stop observe_field before changes are made to
the form then restart it.

With much searching I found a Event.stopObserving method, but I''m not
certain how to apply this to my observe_form observer.
>From the source:
new Form.EventObserver(''process_call_form'', function(element,
value)
{new Ajax.Request(''/rails/assistant/add_element'',
{asynchronous:true,
evalScripts:true,
parameters:''Form.serialize(process_call_form)='' +
value})})
>From this I did:
function = "function(element, value) {new
Ajax.Request(''/rails/assistant/add_element'',
{asynchronous:true,
evalScripts:true,
parameters:''Form.serialize(process_call_form)='' +
value})}"

page << "Event.stopObserving(''process_call_form'',
''change'',
#{function})"

This doesn''t throw an error, but it doesn''t stop or
"reset" the
observer as far as I can tell either. new element are still unobserved
and old elements still are.

I tried using ''click'' instead of ''change'' as
well since the api docs
indicate that the default :on => option varies from buttons to other
elements.


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krunk- wrote:
> ...
> >From the source:
> new Form.EventObserver(''process_call_form'',
function(element, value)
> {new Ajax.Request(''/rails/assistant/add_element'',
{asynchronous:true,
> evalScripts:true,
parameters:''Form.serialize(process_call_form)='' +
> value})})
> ...
> page <<
"Event.stopObserving(''process_call_form'',
''change'',
> #{function})"
>   
The third parameter in Event.stopObserving() should be a handle from the 
original Event.observe() call.  For example:

var handle = Event.observe(element,''click'',myFunc);
Event.stopObserving(element,''click'',handle);

 From what I can see in the source of the parent class 
Abstract.EventObserver() there is no returning or caching of the 
Event.observe() handles.

Perhaps this is a limitation or am I missing something?

--Ken



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