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jquery-ui-rails-cdn

NOTE: use v0.1.5 to use jquery-ui less then v1.11.0

Add CDN support to

• jquery-ui-rails.

This gem is designed to be used with jquery-rails-cdn

Serving javascripts and stylesheets from a publicly available CDN has clear benefits:

• Speed: Users will be able to download jQuery UI from the closest physical location.
• Caching: CDN is used so widely that potentially your users may not need to download jQuery UI and others at all.
• Parallelism: Browsers have a limitation on how many connections can be made to a single host. Using CDN for jQuery UI offloads a big one.

Features

This gem offers the following features:

• Supports multiple CDN. (Google, Microsoft, Yandex and jqueryui.com)
• jQuery-UI version is automatically detected via jquery-ui-rails.
• Automatically fallback to jquery-ui-rails' bundled jQuery UI when:
  • You're on a development environment so that you can work offline.
  • The CDN is down or unavailable.

On top of that, if you're using asset pipeline, you may have noticed that the major chunks of the code in application.js is jQuery UI. Implications of externalizing jQuery UI from application.js are:

• Updating your js code won't evict the entire cache in browsers - your code changes more often than jQuery UI upgrades, right?
• rake assets:precompile takes less peak memory usage.

Changelog:

• v0.2.0: Lock jquery-ui-rails to >= 5.0 due to major changes in jquery-ui v1.11.0
• v0.1.5: Lock jquery-ui-rails to < 5.0 due to major changes in jquery-ui v1.11.0
• v0.1.4: Stop exposing force: true to the tag
• v0.1.3: Various bugfixes
• v0.1.2: Compatibility fix + various gem spec changes
• v0.1.1: Readme fix
• v0.1.0: Initial release

Installation

Add this line to your application's Gemfile:

gem 'jquery-ui-rails-cdn'

WARNING

From jquery-ui-rails 4.1.0 onward, Jquery::Ui::Rails::JQUERY_UI_VERSION is defiend and auto updated on each release.

• See this commit

If you are using version lower than 4.1.0, you will need to use forked version of jquery-ui-rails

• techbang-jquery-ui-rails or any other which defines Jquery::Ui::Rails::JQUERY_UI_VERSION.

Usage

This gem adds these methods to generate a script tag to the jQuery on a CDN of your preference: jQuery_ui_include_tag and jquery_ui_url

If you're using asset pipeline with Rails 3.1+, first remove //= require jquery-ui (or other special files if you are using not full version) from application.js.

Then in layout:

= jquery_include_tag :google
= jquery_ui_include_tag :google
= javascript_include_tag 'application'

Note that valid CDN symbols for jQuery and jQuery-UI are:

:google
:microsoft
:jquery
:yandex

Note that valid CDN symbols for bootstrap are:

:default

It will generate the following for jQuery-UI on production:

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.4/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
//<![CDATA[
window.jQuery || document.write(unescape('%3Cscript src="/assets/jquery-ui-3aaa3fa0b0207a1abcd30555987cd4cc.js" type="text/javascript">%3C/script>'))
//]]>
</script>

on development:

<script src="/assets/jquery.js?body=1" type="text/javascript"></script>

If you want to check the production URL, you can pass :force => true as an option.

jquery_ui_include_tag :google, :force => true

To fallback to rails assets when CDN is not available, add jquery-ui.js in config/environments/production.rb

config.assets.precompile += %w( jquery.js jquery-ui.js )