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Unobtrusive scripting adapter for jQuery

This unobtrusive scripting support file is developed for the Ruby on Rails framework, but is not strictly tied to any specific backend. You can drop this into any application to:

  • force confirmation dialogs for various actions;
  • make non-GET requests from hyperlinks;
  • make forms or hyperlinks submit data asynchronously with Ajax;
  • have submit buttons become automatically disabled on form submit to prevent double-clicking.

These features are achieved by adding certain "data" attributes to your HTML markup. In Rails, they are added by the framework's template helpers.

Full documentation is on the wiki, including the list of published Ajax events.

Requirements

If you don't use HTML5, adding "data" attributes to your HTML4 or XHTML pages might make them fail W3C markup validation. However, this shouldn't create any issues for web browsers or other user agents.

Installation

For automated installation in Rails, use the "jquery-rails" gem. Place this in your Gemfile:

gem 'jquery-rails', '~> 2.1'

And run:

$ bundle install

This next step depends on your version of Rails.

a. For Rails 3.1, add these lines to the top of your app/assets/javascripts/application.js file:

//= require jquery
//= require jquery_ujs

b. For Rails 3.0, run this command (add --ui if you want jQuery UI):

Be sure to get rid of the rails.js file if it exists, and instead use the new jquery_ujs.js file that gets copied to the public directory. Choose to overwrite jquery_ujs.js if prompted.

$ rails generate jquery:install

Manual installation (including Rails 2)

Download jQuery and "rails.js" and place them in your "javascripts" directory.

Configure the following in your application startup file (for Rails 3):

  config.action_view.javascript_expansions[:defaults] = %w(jquery rails)

Or create an initializer (for Rails 2):

module ActionView::Helpers::AssetTagHelper
  remove_const :JAVASCRIPT_DEFAULT_SOURCES
  JAVASCRIPT_DEFAULT_SOURCES = %w(jquery.js rails.js)

  reset_javascript_include_default
end

Now the template helper javascript_include_tag :defaults will generate SCRIPT tags to load jQuery and rails.js.

For Rails 2, you will need to manually implement the csrf_meta_tag helper and include it inside the <head> of your application layout.

The csrf_meta_tags (Rails 3.1) and csrf_meta_tag (Rails 3.0) helpers generate two meta tags containing values necessary for the cross-site request forgery protection built into Rails. Here is how to implement that helper in Rails 2:

  # app/helpers/application_helper.rb
  def csrf_meta_tag
    if protect_against_forgery?
      out = %(<meta name="csrf-param" content="%s"/>\n)
      out << %(<meta name="csrf-token" content="%s"/>)
      out % [ Rack::Utils.escape_html(request_forgery_protection_token),
              Rack::Utils.escape_html(form_authenticity_token) ]
    end
  end