Tabs on Rails

TabsOnRails is a simple Rails plugin for creating tabs and navigation menus. It provides helpers for generating navigation menus with a flexible interface.

• Rails 4.2 or Rails 5

For older versions of Ruby or Ruby on Rails, see the CHANGELOG.

Add this line to your application's Gemfile:

gem "tabs_on_rails"

And then execute bundle to install the dependencies:

$ bundle

Use Bundler and the :git option if you want to grab the latest version from the Git repository.

In your template use the tabs_tag helper to create your tab.

<%= tabs_tag do |tab| %>
  <%= tab.home      'Homepage', root_path %>
  <%= tab.dashboard 'Dashboard', dashboard_path %>
  <%= tab.account   'Account', account_path %>
<% end %>

renders

<ul>
  <li><a href="/">Homepage</a></li>
  <li><a href="/dashboard">Dashboard</a></li>
  <li><a href="/account">Account</a></li>
</ul>

The usage is similar to the Rails route file. You create named tabs with the syntax tab.name_of_tab. The name you use creating a tab is the same you're going to refer to in your controller when you want to mark a tab as the current tab.

class DashboardController < ApplicationController
  set_tab :dashboard
end

Now, if the action belongs to DashboardController, the template will automatically render the following HTML code.

<ul>
  <li><a href="/">Homepage</a></li>
  <li class="custom"><span>Dashboard</span></li>
  <li><a href="/account">Account</a></li>
</ul>

Use the current_tab helper method if you need to access the value of current tab in your controller or template.

class DashboardController < ApplicationController
  set_tab :dashboard
end

In your view

<p>The name of current tab is <%= current_tab %>.</p>

You can pass a hash of options to customize the style and the behavior of the tab item. Behind the scenes, each time you create a tab, the #tab_for method is invoked.

<%= tabs_tag do |tab| %>
  <%= tab.home      'Homepage', root_path, :style => "padding: 10px" %>
  <%= tab.dashboard 'Dashboard', dashboard_path %>
<% end %>

renders

<ul>
  <li style="padding: 10px"><a href="/">Homepage</a></li>
  <li class="custom"><span>Dashboard</span></li>
  <li><a href="/account">Account</a></li>
</ul>

See TabsOnRails::Tabs::TabsBuilder#tab_for for more details.

The open_tabs and the close_tabs methods can be customized with the :open_tabs and :close_tabs option.

<%= tabs_tag open_tabs: { id: 'tabs', class: 'cool' } do |tab| %>
  <%= tab.home      'Homepage', root_path %>
  <%= tab.dashboard 'Dashboard', dashboard_path %>
  <%= tab.account   'Account', account_path %>
<% end %>

renders

<ul id="tabs" class="cool">
  <li><a href="/">Homepage</a></li>
  <li><a href="/dashboard">Dashboard</a></li>
  <li><a href="/account">Account</a></li>
</ul>

Further customizations require a custom Builder (see below).

The set_tab method understands all options you are used to pass to a Rails controller filter. In fact, behind the scenes this method uses a before_filter to store the tab in the @tab_stack variable.

Taking advantage of Rails filter options, you can restrict a tab to a selected group of actions in the same controller.

class PostsController < ApplicationController
  set_tab :admin
  set_tab :posts, :only => %w(index show)
end

class ApplicationController < ActionController::Base
  set_tab :admin, :if => :admin_controller?
  
  def admin_controller?
    self.class.name =~ /^Admin(::|Controller)/
  end
end

Namespaces enable you to create and manage tabs in parallels. The best way to demonstrate namespace usage is with an example.

Let's assume your application provides a first level navigation menu with 3 elements: :home, :dashboard, :projects. The relationship between your tabs and your controllers is 1:1 so you should end up with the following source code.

class HomeController
  set_tab :home
end

class DashboardController
  set_tab :dashboard
end

class ProjectsController
  set_tab :projects
  
  def first; end
  def second; end
  def third; end
end

The project controller contains 3 actions and you might want to create a second-level navigation menu. This menu should reflect the navigation status of the user in the project page.

Without namespaces, you wouldn't be able to accomplish this task because you already set the current tab value to :projects. You need to create a parallel navigation menu and uniquely identify it with a custom namespace. Let's call it :navigation.

class ProjectsController
  set_tab :projects

  # Create an other tab navigation level
  set_tab :first, :navigation, :only => %w(first)
  set_tab :second, :navigation, :only => %w(second)
  set_tab :third, :navigation, :only => %w(third)

  def first; end
  def second; end
  def third; end
end

Voilà! That's all you need to do. And you can create an unlimited number of namespaces as long as you use an unique name to identify them.

The default namespace is called :default. Passing :default as name is the same as don't using any namespace at all. The following lines are equivalent.

set_tab :projects
set_tab :projects, :default

To switch namespace in your template, just pass the :namespace option to the tabs_tag helper method.

<%= tabs_tag do |tab| %>
  <%= tab.home      'Homepage', root_path %>
  <%= tab.dashboard 'Dashboard', dashboard_path %>
  <%= tab.projects  'Projects', projects_path %>
<% end %>

<%= tabs_tag :namespace => :navigation do |tab| %>
  <%= tab.first   'First', project_first_path %>
  <%= tab.second  'Second', project_second_path %>
  <%= tab.third   'Account', project_third_path %>
<% end %>

As a bonus feature, the namespace needs to be unique within current request scope, not necessarily across the entire application.

Back to the previous example, you can reuse the same namespace in the other controllers. In this way, you can reuse your templates as well.

class HomeController
  set_tab :home
end

class DashboardController
  set_tab :dashboard

  set_tab :index,  :navigation, :only => %w(index)
  set_tab :common, :navigation, :only => %w(foo bar)
  
  # ...
end

class ProjectsController
  set_tab :projects

  set_tab :first,  :navigation, :only => %w(first)
  set_tab :second, :navigation, :only => %w(second)
  set_tab :third,  :navigation, :only => %w(third)
  
  # ...
end

The Builder is responsible for creating the tabs HTML code. This library is bundled with two Builders:

• Tabs::Builder: this is the abstract interface for any custom builder.
• Tabs::TabsBuilder: this is the default builder.

Builders act as formatters. A Builder encapsulates all the logic behind the tab creation including the code required to toggle tabs status.

When the tabs_tag helper is called, it creates a new Tabs instance with selected Builder. If you don't provide a custom builder, then Tabs::TabsBuilder is used by default.

All builders must extend the base Tabs::Builder class and implement at least the tab_for method. Additional overridable methods include:

• open_tabs: the method called before the tab set
• close_tabs: the method called after the tab set
• tab_for: the method called to create a single tab item

The following example creates a custom tab builder called MenuTabBuilder.

class MenuTabBuilder < TabsOnRails::Tabs::Builder
  def open_tabs(options = {})
    @context.tag("ul", options, open = true)
  end

  def close_tabs(options = {})
    "</ul>".html_safe
  end

  def tab_for(tab, name, options, item_options = {})
    item_options[:class] = (current_tab?(tab) ? 'active' : '')
    @context.content_tag(:li, item_options) do
      @context.link_to(name, options)
    end
  end
end

In your view, simply pass the builder class to the tabs_tag method.

<%= tabs_tag(:builder => MenuTabBuilder) do |tab| %>
  <%= tab.home        'Homepage', root_path %>
  <%= tab.dashboard,  'Dashboard', dashboard_path %>
  <%= tab.account     'Account', account_path, style: 'float: right;' %>
<% end %>

renders

<ul>
  <li class=""><a href="/">Homepage</a></li>
  <li class="active"><a href="/dashboard">Dashboard</a></li>
  <li class="" style="float: right;"><a href="/account">Account</a></li>
</ul>

TabsOnRails was created and is maintained by Simone Carletti. Many improvements and bugfixes were contributed by the open source community.

Direct questions and discussions to Stack Overflow.

Pull requests are very welcome! Please include tests for every patch, and create a topic branch for every separate change you make.

Report issues or feature requests to GitHub Issues.

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Copyright (c) 2009-2017 Simone Carletti. This is Free Software distributed under the MIT license.