View helpers for Ruby applications
- Home page: http://lotusrb.org
- Mailing List: http://lotusrb.org/mailing-list
- API Doc: http://rdoc.info/gems/lotus-helpers
- Bugs/Issues: https://github.com/lotus/helpers/issues
- Support: http://stackoverflow.com/questions/tagged/lotus-ruby
- Chat: https://gitter.im/lotus/chat
Lotus::Helpers supports Ruby (MRI) 2+
Add this line to your application's Gemfile:
gem 'lotus-helpers'And then execute:
$ bundleOr install it yourself as:
$ gem install lotus-helpersLotus::Helpers offers a set of utilities to enrich web views.
HTML5 markup generator (#html).
View:
module Users
class Show
include Lotus::Helpers
def sidebar
html.aside(id: 'sidebar') do
p "Languages", class: 'title'
ul do
li "Italian"
li "English"
end
end
end
end
endTemplate:
<%= sidebar %>Output:
<aside id="sidebar">
<p class="title">Languages</p>
<ul>
<li>Italian</li>
<li>English</li>
</ul>
</aside>Form generator for HTML5 (#form_for)
Template:
<%=
form_for :book, routes.books_path do
text_field :title
submit 'Create'
end
%>Output:
<form action="/books" method="POST" accept-charset="utf-8" id="book-form">
<input type="text" name="book[title]" id="book-id" value="">
<button type="submit">Create</button>
</form>View:
module Books
class New
include Lotus::Helpers
def form
form_for :book, routes.books_path do
text_field :title
submit 'Create'
end
end
end
endTemplate:
<%= form %>Output:
<form action="/books" method="POST" accept-charset="utf-8" id="book-form">
<input type="text" name="book[title]" id="book-id" value="">
<button type="submit">Create</button>
</form>Views:
module Books
class New
include Lotus::Helpers
def form
Form.new(:book, routes.books_path)
end
def submit_label
'Create'
end
end
class Edit
include Lotus::Helpers
def form
Form.new(:book, routes.book_path(id: book.id), {book: book}, {method: :patch})
end
def submit_label
'Update'
end
end
endTemplates:
# books/new.html.erb
<%= render partial: 'books/form' %># books/edit.html.erb
<%= render partial: 'books/form' %># books/_form.html.erb
<%=
form_for form, class: 'form-horizontal' do
text_field :title
submit submit_label
end
%>Output for new:
<form action="/books" method="POST" accept-charset="utf-8" id="book-form">
<input type="text" name="book[title]" id="book-id" value="">
<button type="submit">Create</button>
</form>Output for edit:
<form action="/books/23" method="POST" accept-charset="utf-8" id="book-form">
<input type="hidden" name="_method" value="PATCH">
<input type="text" name="book[title]" id="book-id" value="TDD">
<button type="submit">Update</button>
</form>HTML (#h), HTML attribute (#ha) and URL (#hu) escape helpers.
View:
module Users
class Show
include Lotus::Helpers
def home_page_link
%(<a href="#{ hu(user.home_page_url) }" title="#{ ha(user.name} }'s website">#{ h(user.website_name) }</a>)
end
def code_snippet
raw user.code_snippet
end
end
endTemplate:
<%= home_page_link %>
<%= code_snippet %>Output:
<a href="https://example.org" title="Maria's website">My Blog</a>
<code>puts "Hello, World!"</code>Lotus and Lotus::Router integration (#routes).
View:
module Home
class Index
include Lotus::Helpers
def link_to_home
%(<a href="#{ routes.home_path }">Home</a>)
end
end
endTemplate:
<%= link_to_home %>Output:
<a href="/">Home</a>Format numbers (#format_number).
View:
module Home
class Index
include Lotus::Helpers
def visitors_count
format_number '1000'
end
end
endTemplate:
<p><%= visitors_count %></p>Output:
<p>1,000</p>All the Lotus helpers are modules to include.
Most of the time they inject private methods. This restriction prevents helper methods to be used on the outside (eg. in a template).
We want to encourage developers to use meaningful and simple APIs in their templates.
module Users
class Show
include Lotus::Helpers
end
end<%= format_number user.followers_count %>This style increases the complexity of the template and it makes testing hard.
module Users
class Show
include Lotus::Helpers
def followers_count
format_number user.followers_count
end
end
end<%= followers_count %>This simplifies the markup.
In order to test the value that will be printed becomes easier: Users::Show#followers_count.
Lotus::Helpers uses Semantic Versioning 2.0.0
- Fork it ( https://github.com/lotus/helpers/fork )
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create a new Pull Request
Copyright © 2014-2015 Luca Guidi – Released under MIT License
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