diff options
Diffstat (limited to 'actionpack/lib/action_view/helpers/capture_helper.rb')
-rw-r--r-- | actionpack/lib/action_view/helpers/capture_helper.rb | 44 |
1 files changed, 32 insertions, 12 deletions
diff --git a/actionpack/lib/action_view/helpers/capture_helper.rb b/actionpack/lib/action_view/helpers/capture_helper.rb index 8abd85c3a3..397738dd98 100644 --- a/actionpack/lib/action_view/helpers/capture_helper.rb +++ b/actionpack/lib/action_view/helpers/capture_helper.rb @@ -13,7 +13,6 @@ module ActionView # The capture method allows you to extract part of a template into a # variable. You can then use this variable anywhere in your templates or layout. # - # ==== Examples # The capture method can be used in ERB templates... # # <% @greeting = capture do %> @@ -81,8 +80,8 @@ module ActionView # <%# This is the layout %> # <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> # <head> - # <title>My Website</title> - # <%= yield :script %> + # <title>My Website</title> + # <%= yield :script %> # </head> # <body> # <%= yield %> @@ -96,7 +95,7 @@ module ActionView # Please login! # # <% content_for :script do %> - # <script type="text/javascript">alert('You are not authorized to view this page!')</script> + # <script>alert('You are not authorized to view this page!')</script> # <% end %> # # Then, in another view, you could to do something like this: @@ -110,7 +109,7 @@ module ActionView # That will place +script+ tags for your default set of JavaScript files on the page; # this technique is useful if you'll only be using these scripts in a few views. # - # Note that content_for concatenates the blocks it is given for a particular + # Note that content_for concatenates (default) the blocks it is given for a particular # identifier in order. For example: # # <% content_for :navigation do %> @@ -127,16 +126,37 @@ module ActionView # # <ul><%= content_for :navigation %></ul> # + # If the flush parameter is true content_for replaces the blocks it is given. For example: + # + # <% content_for :navigation do %> + # <li><%= link_to 'Home', :action => 'index' %></li> + # <% end %> + # + # <%# Add some other content, or use a different template: %> + # + # <% content_for :navigation, true do %> + # <li><%= link_to 'Login', :action => 'login' %></li> + # <% end %> + # + # Then, in another template or layout, this code would render only the last link: + # + # <ul><%= content_for :navigation %></ul> + # # Lastly, simple content can be passed as a parameter: # # <% content_for :script, javascript_include_tag(:defaults) %> # # WARNING: content_for is ignored in caches. So you shouldn't use it # for elements that will be fragment cached. - def content_for(name, content = nil, &block) + def content_for(name, content = nil, flush = false, &block) if content || block_given? - content = capture(&block) if block_given? - @view_flow.append(name, content) if content + if block_given? + flush = content if content + content = capture(&block) + end + if content + flush ? @view_flow.set(name, content) : @view_flow.append(name, content) + end nil else @view_flow.get(name) @@ -164,8 +184,8 @@ module ActionView # <%# This is the layout %> # <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> # <head> - # <title>My Website</title> - # <%= yield :script %> + # <title>My Website</title> + # <%= yield :script %> # </head> # <body class="<%= content_for?(:right_col) ? 'one-column' : 'two-column' %>"> # <%= yield %> @@ -181,7 +201,7 @@ module ActionView def with_output_buffer(buf = nil) #:nodoc: unless buf buf = ActionView::OutputBuffer.new - buf.force_encoding(output_buffer.encoding) if output_buffer.respond_to?(:encoding) && buf.respond_to?(:force_encoding) + buf.force_encoding(output_buffer.encoding) if output_buffer end self.output_buffer, old_buffer = buf, output_buffer yield @@ -194,7 +214,7 @@ module ActionView def flush_output_buffer #:nodoc: if output_buffer && !output_buffer.empty? response.body_parts << output_buffer - self.output_buffer = output_buffer[0,0] + self.output_buffer = output_buffer.respond_to?(:clone_empty) ? output_buffer.clone_empty : output_buffer[0, 0] nil end end |