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impress/app/helpers/head_js_helper.rb

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Ruby
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2010-12-05 18:18:52 -08:00
module HeadJsHelper
JAVASCRIPT_LIBRARIES = {}
YAML.load_file(Rails.root.join('config', 'javascript_libraries.yml')).each do |name, src|
JAVASCRIPT_LIBRARIES[name.to_sym] = src
end
def html5
content_for :html5, "<!--[if lt IE 9]>#{javascript_tag(JAVASCRIPT_LIBRARIES[:html5])}<![endif]-->".html_safe
end
def javascript_chain(*javascripts)
# two-dimensional array: list of chains
@javascript_chains ||= []
@javascript_chains << javascripts
end
def javascript_chains
if @javascript_chains
javascript_include_tag('head') + "\n" + javascript_chains_tag(@javascript_chains)
end
end
def javascript_chain_line(chain)
chain_args = chain.map {
|script_name| javascript_library_path(script_name).inspect
}.join(', ')
"head.js(#{chain_args});"
end
def javascript_chains_tag(chains)
output_js do |js|
chains.each do |chain|
js << javascript_chain_line(chain)
end
end
end
private
def javascript_library_path(script_name)
script_name.is_a?(Symbol) ? JAVASCRIPT_LIBRARIES[script_name] : javascript_path(script_name)
end
def output_js(&block)
javascript_tag(safe_output(&block))
end
def safe_output(&block)
[].tap(&block).join("\n").html_safe
end
end