[Rails] Ajax - the Rails way!

I find the Rails online documentation at
"http://guides.rubyonrails.org/form_helpers.html#dealing-with-ajax"
difficult to follow, due to the way the information is organized. For
example, I wanted to look for Ajax, so I looked under "View". But,
because the material is organized in the MVC format, I can always see
half of the solution, and not an entire one. I don't know if anyone
experienced the same thing.

Back to Ajax, under View, I can see how the form is formed. But, what
is missing is what happened after the form is submitted. Ajax is about
interacting between client side and server side. I realized that I had
to look under "Controller" for the other half of the solution,
especially how Rails renders the result before going back to the client
side. Long story short, here I have a simple form:

<% form_tag({:controller => "main", :action => "contact"}, :remote =>
true, :update => "result") do %>
Name:<br/><%= text_field_tag(:name, :"", :id => "name") %><br/><br/>
Message:<br/><%= text_area_tag(:message, :"", :id => "message")
%><br/>
<%= submit_tag "Send" %>
<% end %>
<div id="result"></div>

First problem, my form now disappeared. It appeared when it was

<%= form_tag("/main/contact", :method => "post", :id => "contactForm")
do %>

What's wrong with the above code ?

Actually, what I really wanted to ask is more on the server side for
this code to work:

def contact
...
end

Anyway, one problem at a time. Thanks so much.

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