Today I found two best API sites. One is http://www.gotapi.com.
This site provides APIs of almost all languages.
The other API site which is only focused on Rails is http://www.railsbrain.com/. I like this most. You can also download this API. It is AJAX based fast, useful.

I have provided the source code of the ajax based drag drop tree in rubyonrails in one of my previous posts.
I found some of the people are getting problems to incorporate the code into their running applications so i am providing a sample rails application in which all the code for tree is already been […]

There is no way to upload files using AJAX. How Gmail does it then? Well, the answer is using <iframe>. Here is a post that describe this technique in detail. Infact we are using this technique from months, obviously inspired by Gmail. ;-)
update: Technically speaking, it’s not Ajax. Just an iframe hack. You are […]

While surfing on net I came across a javascript library(animator.js) based on prototype library written by Bernie Sumption.
I found this library a bit interesting. One that appeals me is the ability to define start state and end state through CSS
See in action here.

Ajaxified Drag Drop Tree in RoR
CASE STUDY
I m providing a very generalized use case where the tree fits in a good position. Here it is…
Consider a model Item, a controller Items. Item model is using a fabulous acts_as_tree and we are going to put a seed for Item to grow it in an ajax tree […]