observe_field in rails (2.3.4)

The last two days I was busy finding out why my field observer didn't work. I followed the book (AWDR3) but somehow it failed.

I used a controller on a sublevel (pim/offers) and that made things a bit harder. I wanted to add an action which wasn't found. I had to add it to the routes.rb (via the :collection argument!). The default expected method is :post, so take care of that.

For the observer I needed, I had to provide the year and month fields. The book gave a option of concatenating some things. This is by the way where I lost a lot of time, the books "encodeURIComponent(value)" part was not copied exactly by me I started with an Uppercase E. After more then a day I found it, yeah!
After I found that nasty error I was looking for a way to pass multiple parameters. I found this: "Form.serializeElements($('month_date', 'year_date'))". You provide a comma seperated list of id's and their values are serialized for you.

Below the copied part of a working piece of a rails based field observer.

<%= observe_field :month_date,   :update => "list",
 :before => "Element.show('spinner')",
 :complete => "Element.hide('spinner')",
 :url => {:action => :month_offers, :only_path => false},
 :with => "Form.serializeElements($('month_date', 'year_date'))"
%>

Hope I helped some people with this post. Good luck!

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