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= NestedLayouts
Plugin allows to specify outer layouts for particular layout thus creating nested layouts.
== Wrapping layout into another layout
Let's assume you have controller which action 'hello' just was called.
Controller was set up to use 'inner' layout:
app/controllers/hello_controller.rb
class HelloController < ApplicationController
layout 'inner'
def hello
render :text => 'Hello, world!'
end
end
app/views/layouts/inner.rhtml
<% inside_layout 'outer' do -%>
<div class="hello">
<h1>Greetings</h1>
<%= yield %>
</div>
<% end -%>
app/views/layouts/outer.rhtml
<html>
<body>
<div class="content">
<%= yield %>
</div>
</body>
</html>
Result will look like this (formatted for better reading):
<html>
<body>
<div class="content">
<div class="hello">
<h1>Greetings</h1>
Hello, world!
</div>
</div>
</body>
</html>
== Concept
Concept of layout nesting here is based on the assumption that every
inner layout is used only to _customize_ it's outer layout and thus every
inner layout is used only with one specific outer layout. With this in
mind we can conclude that every layout must know it's outer layout and
thus information about outer layout must be embeded directly into inner
layout. Controller doesn't need to know about the whole stack of layouts,
so you should just specify the most inner layout in it.
== Passing data
You can pass data from inner layout to outer one, e.g.:
layouts/inner.rhtml
<% content_for 'menu' do -%>
<ul>
<li><a href="about_us">About Us</a></li>
<li><a href="products">Products</a></li>
</ul>
<% end -%>
<% inside_layout 'outer' do -%>
<% @other_data_for_outer_layout = 'foo' -%>
<%= yield %>
<% end -%>
layouts/outer.rhtml
<%= yield 'menu' %>
<br/>
The data was: <%= @other_data_for_outer_layout %>
<br/>
<%= yield %>
== Inline layouts
Instead of using layout stored in file system, you can use
+inside_inline_layout+ to wrap template part into some template
code passed as a string. It is usefull if you want to use
layouts that are stored in DB:
Layout model
class Layout < ActiveRecord::Base
# Has attributes 'name' and 'contents'
end
Helper
module ApplicationHelper
def inside_db_layout(name, &block)
layout = Layout.find_by_name(name)
template = layout ? layout.contents : '<%= yield %>'
inside_inline_layout(template, &block)
end
end
View
<% inside_db_layout 'layout_from_db1' do %>
Content
<% end %>
== Installation
./script/plugin install git://github.com/amatsuda/nested_layouts.git
If you prefer a fork of the plugin, replace "amatsuda" with the fork maintainer.
== Bugs & Feedback
If you encounter any bugs or has some feature proposal, feel free to email it to maxim.kulkin@gmail.com.
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