Selected Links

Adds a link helper to ActionView::Base. This helper adds a class of active to the link when matched to a pattern, usually a url.

Add this line to your application's Gemfile:

gem 'selected_links'

And then execute:

$ bundle

Or install it yourself as:

$ gem install selected_links

Usage is the same as link_to, the helper takes 3 optional arguments :matcher, :source and class_name.

You can override the default behaviour in an initilizer file:

SelectedLinks.setup do |config|
  # Change the global default source that the matcher looks to check against
  config.default_source = 'request.path'

  # Change the fallback behaviour to match against the name of the link if the matcher fails
  config.fallback_to_name = false

  # Set the global default class name that is added to the link when a match is found
  config.default_class_name = 'active'
end

To make this link have a class of active when the url is at the top level:

<%= selectable_link_to 'Home', root_url, :matcher => '\/\z' %>

To make the link selected when the url has topic anywhere in it:

<%= selectable_link_to 'Topics', topics_url, :matcher => 'topic' %>

Blocks still work and this will do the same thing as the previous example:

<% selectable_link_to community_url, :matcher => 'topic' do %>
  <%= content_tag :span, 'Community', :class => 'foo' %>
<% end %>

Without a matcher option and NOT in the block form, this will look for about in the source if the option fallback_to_name is true:

<%= selectable_link_to 'ABOUT', about_url %>

You can add this to links with other clases on them:

<%= selectable_link_to 'ABOUT', about_url, :class => 'nav' %>
# => <a ... class="nav avtive">ABOUT</a>

To override the source per link, just add a :source argument:

<%= selectable_link_to 'ABOUT', about_url, :source => request.url %>

To override the default class name added per link, add :class_name argument:

<%= selectable_link_to 'ABOUT', about_url, :class_name => 'highlight' %>

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request