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A Rails plugin for forms, in an ordered list. Exactly as it says on the tin.
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README

AjaxValidation
==============

This is a basic extension to provide inline AJAX powered validation of your models it is currently
a very early version so there are a number of assumptions.

* It assumes that your model/controller are singular/plural post/posts
* It assumes you are using the form_for helper

Example
--------------
In routes.rb add the following, this extra action allows us to validate the model

  map.resources :posts, :collection => [:validate]

In your controller add the following

class PostsController < ApplicationController
  ajax_validation_for :post
  ...
end

Lets take a look at an example view, the new.rhtml. As you can see we are using a custom form builder 
ajax_validation_form_for, this will generate some html around the form elements. A number of elements will have
to be defined manually however, their html should looks something like the user_id field. Note the id specified
in the form_for, is referenced in the call to observe_form. 

If ordered list forms aren't your taste, it's not to hard to override the form builder to produce something different.
There is an example css file that will help as a starter.


<h1>New Post</h1>
<%= error_messages_for :post %>
<%- ajax_validation_form_for(:post, :url => posts_url, :html => {:id => "post_form"}) do |f| -%>
  <%= f.text_field :title %>        
  <%= f.text_area :body %>
  <li id="post_user_id_item">
      <label for="post_user_id">Author<span class="hint"></span></label>
      <%= f.collection_select :user_id, @users, :id, :display_name %>
      <span id="post_user_id_validation"></span>
  </li>
  <%= f.datetime_select :published_at %>   
  <%= f.date_select :expires_on %>   
  <%= f.check_box :live %>
  <%= submit_tag "Create" %>
<%- end -%>
<%= observe_form :post_form, :url => validate_posts_path, :frequency => 2 %>
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