Hi!
For a faster initial render of my pages, I have added a script relocator
initializer that scans the page and moves all script tags to the bottom of
the body tag. Order is kept, and the script tags in the `head` tag are
marked with data-turbolinks-eval="false" so they are not executed again on
new pages when using turbolinks.
It seems to work well and do exactly what I want. Can anybody see anything
wrong with it? Any reason NOT to use it? What can it break?
# cat config/initializers/rack-script_relocator.rb
require 'nokogiri'
module Rack
class ScriptRelocator
def initialize(app)
@app = app
end
def call(env)
status, headers, response = @app.call(env)
if headers['Content-Type'] !~ %r{^text/html}
return status, headers, response
end
response_body = ''
response.each { |part| response_body << part }
doc = Nokogiri::HTML(response_body)
scripts = doc.css('script')
return status, headers, response if scripts.empty?
scripts.each do |s|
s['data-turbolinks-eval'] = 'false' if s.parent.name == 'head'
s.remove
doc.at('body') << s
end
transformed_body = doc.to_html
if headers.key?('Content-Length') &&
headers['Content-Length'].to_i != transformed_body.length
headers['Content-Length'] = transformed_body.length.to_s
end
return status, headers, [transformed_body]
end
end
end
Rails.application.config.middleware.use Rack::ScriptRelocator
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