If you are considering the upgrade to Rails 3.1.x and you wish to include the JQuery-UI in your web application follow these simple steps:
//= require jquery //= require jquery_ujs //= require jquery-ui //= require_tree .
Pick and download a nice theme from: JQuery-UI themes site
Copy jquery-ui-1.8.16.custom.css(version number could differ) to your vendor/assets/stylesheets folder as jquery-ui.css (This will save you time later when you are updating or changing the theme) and include it in your app/assets/stylesheets/application.css
*= require_self *= require jquery-ui *= require_tree .
Copy images from the images folder to vendor/assets/images
Modify vendor/assets/stylesheets/jquery-ui.css and replace “images/” to “/assets/”
Now that you have everything set up and ready, go ahead and use the fancy JQuery-UI plugins