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Awesome Open Source

Navigator

Navigator is a Rails Engine that provides a domain specific language for menu navigation. Great for situations in which you need dynamic, server-side, rendering of site navigation menus complete with active page highlighting. You can also style your navigation menus with plain CSS or any CSS framework of your choice.

Features

  • Provides a DSL for building navigation menus.

  • Supports auto-detection/highlighting of active menu items based on current path (customizable for non-path usage too).

  • Supports sub-menus, nested tags, HTML attributes, etc.

  • Supports the following HTML tags:

    • div

    • section

    • header

    • h1 - h6

    • nav

    • ul

    • li

    • a

    • img

    • b

    • em

    • s

    • small

    • span

    • strong

    • sub

    • sup

    • form

    • label

    • select

    • option

    • input

    • button

  • Provides link, image, and item convenience methods for succinct ways to build commonly used menu elements.

Requirements

Setup

To install, run:

gem install navigator

Add the following to your Gemfile:

gem "navigator"

Usage

The following are examples using the navigation view helper:

Unordered List (simple)

Code:

navigation do
  item "Dashboard", "/dashboard"
  item "News", "/posts"
end

Result:

<ul>
  <li><a href="/dashboard">Dashboard</a></li>
  <li><a href="/posts">Posts</a></li>
</ul>

Unordered List (with attributes)

Code:

navigation "ul", attributes: {class: "nav"} do
  item "Dashboard", "/dashboard", item_attributes: {class: "active"}
  item "News", "/posts"
end

Result:

<ul class="nav">
  <li class="active"><a href="/dashboard">Dashboard</a></li>
  <li><a href="/posts">Posts</a></li>
</ul>

Unordered List (with multiple data attributes)

Code:

navigation do
  item "Home", "/home", item_attributes: {data: {id: 1, type: "public"}}
end

Result:

<ul>
  <li data-id="1" data-type="public"><a href="/home">Home</a></li>
</ul>

TIP: Nested data attributes can be applied to any menu item in the same manner as Rails view helpers.

Code:

navigation "nav" do
  a "Dashboard", attributes: {href: "/dashboard"}
  a "News", attributes: {href: "/posts"}
end

Result:

<nav>
  <a href="/dashboard">Dashboard</a>
  <a href="/posts">Posts</a>
</nav>

Foundation Menu

Code:

navigation "nav", attributes: {class: "top-bar", "data-topbar" => nil} do
  ul attributes: {class: "title-area"} do
    li attributes: {class: "name"} do
      h1 do
        a "Demo", attributes: {href: "/home"}
      end
    end
  end

  section attributes: {class: "top-bar-section"} do
    ul attributes: {class: "left"} do
      item "Home", "/"
      item "About", "/about"
    end

    ul attributes: {class: "right"} do
      item "v1.0.0", '#'
    end

    ul attributes: {class: "right"} do
      item "Login", "/login", link_attributes: {class: "button tiny round"}
    end
  end
end

Result:

<nav class="top-bar" data-topbar="">
  <ul class="title-area">
    <li class="name">
      <h1><a href="/" class="active">Demo</a></h1>
    </li>
  </ul>

  <section class="top-bar-section">
    <ul class="left">
      <li class="active"><a href="/">Home</a></li>
      <li><a href="/about">About</a></li>
    </ul>

    <ul class="right">
      <li><a href="#">v1.0.0</a></li>
    </ul>

    <ul class="right">
      <li><a class="button tiny round" href="/login">Login</a></li>
    </ul>
  </section>
</nav>

Bootstrap Dropdown

Code:

navigation "nav" do
  item "Dashboard", admin_dashboard_path
  li attributes: {class: "dropdown"} do
    a "Manage", attributes: {href: "#", class: "dropdown-toggle", "data-toggle" => "dropdown"} do
      b attributes: {class: "caret"}
    end
    ul attributes: {class: "dropdown-menu"} do
      item "Dashboard", admin_dashboard_path
      item "Users", admin_users_path
    end
  end
end

Result:

<ul class="nav">
  <li><a href="/admin/dashboard">Dashboard</a></li>
  <li class="dropdown">
    <a data-toggle="dropdown" class="dropdown-toggle" href="#">
      Manage
      <b class="caret"></b>
    </a>
    <ul class="dropdown-menu">
      <li><a href="/admin/dashboard">Dashboard</a></li>
      <li><a href="/admin/users">Users</a></li>
    </ul>
  </li>
</ul>

There are several convenience methods, in addition to the standard HTML tags, that can make for shorter lines of code. The following describes each:

When building links, the default is:

navigation "nav", activator: activator do
  a "Home", attributes: {href: home_path}
end

…​but can be written as:

navigation "nav", activator: activator do
  link "Home", home_path
end

When building images, the default is:

navigation "nav", activator: activator do
  img attributes: {src: "https://placehold.it/50x50", alt: "Example"}
end
.but can be written as:
navigation "nav", activator: activator do
  image "https://placehold.it/50x50", "Example"
end

When building menu items, the default is:

navigation "nav", activator: activator do
  li do
    a "Home", attributes: {href: home_path}
  end
end

…​but can be written as:

navigation "nav", activator: activator do
  item "Home", "/dashboard"
end

These are just a few, simple, examples of what can be achieved. See the specs for additional usage and customization.

Customization

The navigation view helper can accept an optional Navigator::TagActivator instance.

Code:

activator = Navigator::TagActivator.new search_value: request.env["PATH_INFO"]

navigation "nav", activator: activator do
  link "Home", home_path
  link "About", about_path
end

Result:

<nav>
  <a href="/home" class="active">Home</a>
  <a href="/about" class="active">About</a>
</nav>

This is the default behavior for all navigation menus and is how menu items automatically get the “active” class when the item URL (in this case “/home”) matches the request.env[PATH_INFO"] to indicate current page/active tab.

Navigator::TagActivator instances can be configured as follows:

  • search_key = Optional. The HTML tag attribute to search for. Default: :href.

  • search_value = Required. The value to match against the search_key value in order to update the value of the target_key. Default: nil.

  • target_key = Optional. The HTML tag attribute key value to update when the search_value and search_key value match. Default: :class.

  • target_value = Optional. The value to be applied to the target_key value. If no value exists, then the value is added. Otherwise, if a value exists then the value is appended to the existing value. Default: “active”.

This customization allows for more sophisticated detection/updating of active HTML tags. For example, the example code (above) could be rewritten to use data attributes and customized styles.

Code:

activator = Navigator::TagActivator.new search_key: "data-id",
                                        search_value: "123",
                                        target_key: "data-style"
                                        target_value: "current"

navigation "nav", activator: activator do
  link "Home", home_path, attributes: {data: {id: "123", data-style="info"}}
  link "About", about_path attributes: {data: {id: "789"}}
end

Result:

<nav>
  <a href="/home" data-id="123" data-style="info current">Home</a>
  <a href="/about" data-id="789">About</a>
</nav>

Lastly, the search value can be a regular expression to make things easier when dealing with complicated routes, sub- menus, etc.

Code:

profile_activator = Navigator::TagActivator.new search_value: /^profile.+/

navigation do
  item "Dashboard", dashboard_path
  li activator: profile_activator do
    link "Profile", '#'

    ul do
      item "Addresses", profile_addresses_path
      item "Emails", profile_emails_path
    end
  end
end

Result:

<ul>
  <li><a href="/dashboard">Dashboard</a></li>
  <li class="active">
    <a href="#">Profile</a>
    <ul>
      <li><a href="profile/addresses">Addresses</a></li>
      <li><a href="profile/emails">Emails</a></li>
    </ul>
  </li>
</ul>

Assuming either the Addresses or Emails menu item was clicked, the Profile menu item would be active due to the regular expression (i.e./^profile.+/) matching one of the the `profile/ paths.

Development

To contribute, run:

git clone https://github.com/bkuhlmann/navigator.git
cd navigator
bin/setup

You can also use the IRB console for direct access to all objects:

bin/console

Tests

To test, run:

bundle exec rake

To test the dummy application, run:

cd spec/dummy
bin/rails server

Credits

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