TinyNavigation provides an easy-to-use DSL for defining navigation structures.
TinyNavigation's structures are defined in config/tiny_navigation.rb and are accessed via a single method: navigation. For example, provided the following configuration:
navigation :main do item "Store", :to => "products#index" item "Blog", :to => "blog#index" end
the code for accessing this structure would be:
The resulting structure could be used to generate the markup. For example:
content_tag :ul, :class => :tabs do (navigation(:main).items.map do |item| content_tag :li do link_to item.name, item.url, :class => item.selected? ? :selected : "" end end).join("") end
What TinyNavigation WILL do:
It provides the ability to define and map menu items to resources using the convention set forth in the Rails 3 router. For example, to map a menu item Foo to the show action of the foos_controller simply do:
navigation :top_tabs do item "Foo", :to => "foos#show" end
If one were to omit the specified action from the :to option, the navigation item's action would default to index.
The URL generated from this mapping can be accessed via the url method of the navigation item.
It provides a selected method for getting the selected menu items of a navigational structure. For example, for this definition:
navigation :main do item "Foo", :to => "foos#index" item "Bar", :to => "bars#index" do item "Baz", :to => "bazzs#index" end end
If the menu item Foo is selected, an array containing that menu item is returned. However, if the menu item Baz is selected, an array containing the Bar and the Baz menu items. This is useful for generating bread-crumbs or simply highlighting both the main nav item and its selected sub-nav item.
It allows for the declaration of custom attributes on nav items. For instance, given the configuration in the previous example, we want to right-align the Bar navigation item. To do this we could simply add another option to the item:
navigation :main do item "Foo", :to => "foos#index", :align => :left item "Bar", :to => "bars#index", :align => :right do item "Baz", :to => "bazzs#index" end end
Now, when we render the navigation items we can call align on the item to get its value:
navigation(:main).items.each do |item| if item.align == :right ... end end
It delegates controller method calls made from within the config file to the current controller. For instance, let's say you're using Ryan Bates' fantastic CanCan gem for authorization–which adds a some methods to the controller, namely the can? method–and you want to show or hide navigation items based upon a user's ability. You can do that! Check it:
navigation :main do item("Foo", :to => "foos#index") if can? :read, Foo item "Bar", :to => "bars#index" do item "Baz", :to => "bazzs#index" end end
IMPORTANT if a custom attribute is defined on an item, as mentioned earlier, it will take precedence over a controller attribute of the same name, thus hiding access to the controller attribute from within the config file.
What TinyNavigation WILL NOT do:
TinyNavigation makes no attempt at rendering the navigation. That's up to you. You may want to render your nav items into div tags, while I may want to use an unordered list. That's fine, go for it.
TinyNavigation does not provide authorization logic for limiting access to navigation items; that's a separate concern. It's easy enough to use an authorization gem that does that job quite well, and by allowing for calls to the current controller from within config/tiny_navigation.rb, you can do that.
Installation & Generators (Rails 3)
Install me from RubyGems.org by adding a gem dependency to your Gemfile. Bundler does the rest.
$ bundle install
Then generate the required config file.
$ rails g tiny_navigation
Installation & Generators (Rails 2)
Install as a gem from RubyGems.org and add a gem dependency in the appropriate file.
$ gem install tiny_navigation
Or install as a plugin.
$ script/plugin install git://github.com/coroutine/tiny_navigation.git
Either way, then generate the required config file.
$ script/generate tiny_navigation
Other gems by Coroutine include:
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