A thin wrapper around https://github.com/hakimel/Ladda .
If you copy files from the interwebs into your project, kittens die.
Do this instead (in your Gemfile):
And, in your application.js and application.css:
//= require "spin" //= require "ladda" //= require "ladda.jquery" // only when you use jQuery already, see Ladda docs for usage *= require ladda *= require ladda-themed // this is optional - when you leave this out, it's equivalent to the "ladda-themeless.min.css from the Ladda project
original source https://github.com/Promptus/ladda-rails
I have forked that cause I am in a hurry to build a gem on rubygems.org
And I have updated the ladda version to 0.9.7