Add *_url helpers to get the full assets URL

Adds `image_url`, `javascript_url`, `stylesheet_url`, `audio_url`,
`video_url`, and `font_url` to assets tag helper. These URL helpers will
return the full path to your assets. This is useful when you are going
to reference this asset from external host.

1 files changed, 7 insertions, 0 deletions

diff --git a/actionpack/lib/action_view/helpers/asset_tag_helpers/javascript_tag_helpers.rb b/actionpack/lib/action_view/helpers/asset_tag_helpers/javascript_tag_helpers.rb
index d9f1f88ade..c67f81dcf4 100644
--- a/actionpack/lib/action_view/helpers/asset_tag_helpers/javascript_tag_helpers.rb
+++ b/actionpack/lib/action_view/helpers/asset_tag_helpers/javascript_tag_helpers.rb
@@ -87,6 +87,13 @@ module ActionView
         end
         alias_method :path_to_javascript, :javascript_path # aliased to avoid conflicts with a javascript_path named route
 
+        # Computes the full URL to a javascript asset in the public javascripts directory.
+        # This will use +javascript_path+ internally, so most of their behaviors will be the same.
+        def javascript_url(source)
+          URI.join(current_host, path_to_javascript(source)).to_s
+        end
+        alias_method :url_to_javascript, :javascript_url # aliased to avoid conflicts with a javascript_url 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