Converting observe_field to UJS in Rails 3

I am trying to rewrite my website in Rails 3 and Ruby 1.9.2.
Can some one help me convert my observe_field which is working under
Rails 2.3.5 to Rails 3. I would like to avoid using JQuery as over the
last year everything I have tried in JQuery has failed, including this
one. Perhaps due to my lack of knowledge. I would not like to install
the legacy upgrade.
What I have in my website is several pages(models) which use the same
search text field. Each controller has an action “search” which
renders a partial “_searchresults” on the page with the text field.
The code which works well in Rails 2.3.5 along with one typical
example search action from a controller and the “_searchresults” is
shown below:-

In the searches index.heml.erb:-
***************************************…

Just type the word or part of the word and wait two seconds


<% if params[:area] != nil%>

<% form_tag({:action => “foo”},{:id => “search”}) do %>
<%= label_tag(:query, “Search for:”) %>
<%= text_field_tag(“query”, params[:query], :autocomplete =>
“off” , :onKeyPress=>“return disableEnterKey(event)”) %>
<% end %>

<%= observe_field 'query',  :frequency => 2,
            :update => "search_results",
            :url => {:controller => params[:area], :action =>

“search”,:area => params[:area]},
:method=>:get,
:with => “query” %>

(Search results will be listed here)

<%end%>
<%= set_focus_to_id 'query' %>

In one of the controller:-
******************************…
def search
session[:query] = params[:query].strip if params[:query]

if session[:query] and request.xhr?
@plants_sn = Plant.find(:all, :conditions => [“scientificname
LIKE ?”, “%#{session[:query]}%”], :order => “commonname ASC”)
@plants_cm =Plant.find(:all, :conditions => [“commonname LIKE ?”,
“%#{session[:query]}%”], :order => “commonname ASC”)
@plants_desc =Plant.find(:all, :conditions => [“description
LIKE ?”, “%#{session[:query]}%”], :order => “commonname ASC”)

@plants = (@plants_cm + @plants_sn + @plants_desc).uniq
render :partial => "shared/searchresults", :layout =>

false, :locals => {:searchresults => @plants}
end
end

In Views/Shared/_searchresults:-
**********************…
<% if searchresults.length == 0 %>

Sorry! No articles found...

<% elsif params[:query] == “” %>

<p>You must enter a search term.</p>

<% else %>

<% if params[:area] == "plants" %>
  <table>
  <tr>**************.............elseif,elsfif etc,etc.

At the moment I am trying with a submit_tag, but I am getting a
missing template error. So I must solve this before I can continue
with the observe field.:-

<% end %>

Just type the word or part of the word and wait two seconds


<% if params[:area] != nil%>

<% form_tag url_for({:controller => params[:area], :action
=> :search, :area => params[:area] }), :method => “get”, :remote =>
true do %>
<%= label_tag(:query, “Search for:”) %>
<%= text_field_tag(“query”, params[:query], :autocomplete =>
“off” , :onKeyPress=>“return disableEnterKey(event)”) %>
<%= submit_tag(“Search”, :name => nil) %>
<% end %>

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