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javascript_tag_helpers.rb
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javascript_tag_helpers.rb
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require 'active_support/concern'
require 'active_support/core_ext/file'
require 'action_view/helpers/asset_tag_helpers/asset_include_tag'
module ActionView
module Helpers
module AssetTagHelper
class JavascriptIncludeTag < AssetIncludeTag
def asset_name
'javascript'
end
def extension
'js'
end
def asset_tag(source, options)
content_tag("script", "", { "type" => Mime::JS, "src" => path_to_asset(source) }.merge(options))
end
def custom_dir
config.javascripts_dir
end
private
def expand_sources(sources, recursive = false)
if sources.include?(:all)
all_asset_files = (collect_asset_files(custom_dir, ('**' if recursive), "*.#{extension}") - ['application']) << 'application'
((determine_source(:defaults, expansions).dup & all_asset_files) + all_asset_files).uniq
else
expanded_sources = sources.inject([]) do |list, source|
determined_source = determine_source(source, expansions)
update_source_list(list, determined_source)
end
add_application_js(expanded_sources, sources)
expanded_sources
end
end
def add_application_js(expanded_sources, sources)
if sources.include?(:defaults) && File.exist?(File.join(custom_dir, "application.#{extension}"))
expanded_sources.delete('application')
expanded_sources << "application"
end
end
end
module JavascriptTagHelpers
extend ActiveSupport::Concern
module ClassMethods
# Register one or more javascript files to be included when <tt>symbol</tt>
# is passed to <tt>javascript_include_tag</tt>. This method is typically intended
# to be called from plugin initialization to register javascript files
# that the plugin installed in <tt>public/javascripts</tt>.
#
# ActionView::Helpers::AssetTagHelper.register_javascript_expansion :monkey => ["head", "body", "tail"]
#
# javascript_include_tag :monkey # =>
# <script type="text/javascript" src="/javascripts/head.js"></script>
# <script type="text/javascript" src="/javascripts/body.js"></script>
# <script type="text/javascript" src="/javascripts/tail.js"></script>
def register_javascript_expansion(expansions)
js_expansions = JavascriptIncludeTag.expansions
expansions.each do |key, values|
js_expansions[key] = (js_expansions[key] || []) | Array(values)
end
end
end
# Computes the path to a javascript asset in the public javascripts directory.
# If the +source+ filename has no extension, .js will be appended (except for explicit URIs)
# Full paths from the document root will be passed through.
# Used internally by javascript_include_tag to build the script path.
#
# ==== Examples
# javascript_path "xmlhr" # => /javascripts/xmlhr.js
# javascript_path "dir/xmlhr.js" # => /javascripts/dir/xmlhr.js
# javascript_path "/dir/xmlhr" # => /dir/xmlhr.js
# javascript_path "http://www.example.com/js/xmlhr" # => http://www.example.com/js/xmlhr
# javascript_path "http://www.example.com/js/xmlhr.js" # => http://www.example.com/js/xmlhr.js
def javascript_path(source)
asset_paths.compute_public_path(source, 'javascripts', :ext => 'js')
end
alias_method :path_to_javascript, :javascript_path # aliased to avoid conflicts with a javascript_path named route
# Returns an HTML script tag for each of the +sources+ provided.
#
# Sources may be paths to JavaScript files. Relative paths are assumed to be relative
# to <tt>public/javascripts</tt>, full paths are assumed to be relative to the document
# root. Relative paths are idiomatic, use absolute paths only when needed.
#
# When passing paths, the ".js" extension is optional.
#
# If the application is not using the asset pipeline, to include the default JavaScript
# expansion pass <tt>:defaults</tt> as source. By default, <tt>:defaults</tt> loads jQuery,
# and that can be overridden in <tt>config/application.rb</tt>:
#
# config.action_view.javascript_expansions[:defaults] = %w(foo.js bar.js)
#
# When using <tt>:defaults</tt>, if an <tt>application.js</tt> file exists in
# <tt>public/javascripts</tt> it will be included as well at the end.
#
# You can modify the HTML attributes of the script tag by passing a hash as the
# last argument.
#
# ==== Examples
# javascript_include_tag "xmlhr"
# # => <script type="text/javascript" src="/javascripts/xmlhr.js?1284139606"></script>
#
# javascript_include_tag "xmlhr.js"
# # => <script type="text/javascript" src="/javascripts/xmlhr.js?1284139606"></script>
#
# javascript_include_tag "common.javascript", "/elsewhere/cools"
# # => <script type="text/javascript" src="/javascripts/common.javascript?1284139606"></script>
# # <script type="text/javascript" src="/elsewhere/cools.js?1423139606"></script>
#
# javascript_include_tag "http://www.example.com/xmlhr"
# # => <script type="text/javascript" src="http://www.example.com/xmlhr"></script>
#
# javascript_include_tag "http://www.example.com/xmlhr.js"
# # => <script type="text/javascript" src="http://www.example.com/xmlhr.js"></script>
#
# javascript_include_tag :defaults
# # => <script type="text/javascript" src="/javascripts/jquery.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/rails.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/application.js?1284139606"></script>
#
# * = The application.js file is only referenced if it exists
#
# You can also include all JavaScripts in the +javascripts+ directory using <tt>:all</tt> as the source:
#
# javascript_include_tag :all
# # => <script type="text/javascript" src="/javascripts/jquery.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/rails.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/application.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/shop.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/checkout.js?1284139606"></script>
#
# Note that your defaults of choice will be included first, so they will be available to all subsequently
# included files.
#
# If you want Rails to search in all the subdirectories under <tt>public/javascripts</tt>, you should
# explicitly set <tt>:recursive</tt>:
#
# javascript_include_tag :all, :recursive => true
#
# == Caching multiple JavaScripts into one
#
# You can also cache multiple JavaScripts into one file, which requires less HTTP connections to download
# and can better be compressed by gzip (leading to faster transfers). Caching will only happen if
# <tt>config.perform_caching</tt> is set to true (which is the case by default for the Rails
# production environment, but not for the development environment).
#
# ==== Examples
#
# # assuming config.perform_caching is false
# javascript_include_tag :all, :cache => true
# # => <script type="text/javascript" src="/javascripts/jquery.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/rails.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/application.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/shop.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/checkout.js?1284139606"></script>
#
# # assuming config.perform_caching is true
# javascript_include_tag :all, :cache => true
# # => <script type="text/javascript" src="/javascripts/all.js?1344139789"></script>
#
# # assuming config.perform_caching is false
# javascript_include_tag "jquery", "cart", "checkout", :cache => "shop"
# # => <script type="text/javascript" src="/javascripts/jquery.js?1284139606"></script>
# # <script type="text/javascript" src="/javascripts/cart.js?1289139157"></script>
# # <script type="text/javascript" src="/javascripts/checkout.js?1299139816"></script>
#
# # assuming config.perform_caching is true
# javascript_include_tag "jquery", "cart", "checkout", :cache => "shop"
# # => <script type="text/javascript" src="/javascripts/shop.js?1299139816"></script>
#
# The <tt>:recursive</tt> option is also available for caching:
#
# javascript_include_tag :all, :cache => true, :recursive => true
def javascript_include_tag(*sources)
@javascript_include ||= JavascriptIncludeTag.new(config, asset_paths)
@javascript_include.include_tag(*sources)
end
end
end
end
end