Rails - Jul 2006 - RJS - Getting and Setting Form Element Values Question

I''m still a beginner with RJS so forgive me if this is a simple one - 
but certainly it doesn''t seem logical and googling has not led to .

Given a field with an id of ''posting_subject'' I can do the
following in
my controller with RJS.

    render :update do | page |
      subject = ''this is really something
      page[''posting_subject''].value = subject
    end

And we sing and rejoice. But why can''t I do

    render :update do | page |
      page[''comment_subject''].value =
page[''posting_subject''].value
    end

At the Javascript level the error is that we get

    ${''posting_subject''}.value()

instead of

    ${''posting_subject''}.value

And value is not a function. So, how can I *get* a value of a form 
element!?

-- 
Posted via http://www.ruby-forum.com/.

Ian Cottee wrote:
>     render :update do | page |
>       page[''comment_subject''].value =
page[''posting_subject''].value
>     end
I want to know how to do this too.


-- 
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Nanyang Zhan wrote:
> Ian Cottee wrote:
> 
>>     render :update do | page |
>>       page[''comment_subject''].value =
page[''posting_subject''].value
>>     end
> 
> I want to know how to do this too.
I have just figured out how to do it!!!
>render :update do |page|
>  page<<
"$(''comment_subject'').value=$(''posting_subject'').value"
>end
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