= ContentFor
Small extension for the Sinatra[http://sinatrarb.com] web framework
that allows you to use the following helpers in your views:
<% content_for :some_key do %>
<chunk of="html">...</chunk>
<% end %>
<% yield_content :some_key %>
This allows you to capture blocks inside views to be rendered later
in this request. For example, to populate different parts of your
layout from your view.
When using this with the Haml rendering engine, you should do the
following:
- content_for :some_key do
%chunk{ :of => "html" } ...
= yield_content :some_key
<b>Note</b> that with ERB <tt>yield_content</tt> is called <b>without</b>
an '=' block (<tt><%= %></tt>), but with Haml it uses <tt>= yield_content</tt>.
Using an '=' block in ERB will output the content twice for each block,
so if you have problems with that, make sure to check for this.
== Usage
If you're writing "classic" style apps, then requring
<tt>sinatra/content_for</tt> should be enough. If you're writing
"classy" apps, then you also need to call
<tt>helpers Sinatra::ContentFor</tt> in your app definition.
== And how is this useful?
For example, some of your views might need a few javascript tags and
stylesheets, but you don't want to force this files in all your pages.
Then you can put <tt><% yield_content :scripts_and_styles %></tt> on
your layout, inside the <head> tag, and each view can call
<tt>content_for</tt> setting the appropriate set of tags that should
be added to the layout.
== Credits
Code by foca[http://github.com/foca], inspired on the Ruby on Rails
helpers with the same name. Haml support by mattly[http://github.com/mattly].
