diff options
Diffstat (limited to 'actionpack/lib/action_view/helpers/capture_helper.rb')
-rw-r--r-- | actionpack/lib/action_view/helpers/capture_helper.rb | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/actionpack/lib/action_view/helpers/capture_helper.rb b/actionpack/lib/action_view/helpers/capture_helper.rb index b4197479a0..c90acc5ac2 100644 --- a/actionpack/lib/action_view/helpers/capture_helper.rb +++ b/actionpack/lib/action_view/helpers/capture_helper.rb @@ -111,15 +111,32 @@ module ActionView # # WARNING: content_for is ignored in caches. So you shouldn't use it # for elements that will be fragment cached. - # - # The deprecated way of accessing a content_for block is to use an instance variable - # named <tt>@content_for_#{name_of_the_content_block}</tt>. The preferred usage is now - # <tt><%= yield :footer %></tt>. def content_for(name, content = nil, &block) - ivar = "@content_for_#{name}" content = capture(&block) if block_given? - instance_variable_set(ivar, "#{instance_variable_get(ivar)}#{content}") - nil + return @_content_for[name] << content if content + @_content_for[name] + end + + # content_for? simply checks whether any content has been captured yet using content_for + # Useful to render parts of your layout differently based on what is in your views. + # + # ==== Examples + # + # Perhaps you will use different css in you layout if no content_for :right_column + # + # <%# This is the layout %> + # <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> + # <head> + # <title>My Website</title> + # <%= yield :script %> + # </head> + # <body class="<%= content_for?(:right_col) ? 'one-column' : 'two-column' %>"> + # <%= yield %> + # <%= yield :right_col %> + # </body> + # </html> + def content_for?(name) + @_content_for[name].present? end # Use an alternate output buffer for the duration of the block. |