Simple and clean calculator, which is written on jQuery.
Place these 2 files in your assets folders
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assets/javascripts
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assets/styles
Add to your gemfile:
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gem ‘jquery-rails’
Link these files in your <head> tag:
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<script src=“calculator.js” type=“text/javascript”></script>
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<link href=“calculator.css” media=“all” rel=“stylesheet” type=“text/css” />
Also make sure, that you linked jQquery or Jquery-min to your site (latest version jquery.com/download):
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e.g. <script src=“code.jquery.com/jquery-1.9.0.min.js”></script>
Good luck :)