ValidationAnnotations

Experemental ruby gem for adding html5 attribute annotations to input fields based on active_model validations.

Add this line to your application's Gemfile:

gem 'validation_annotations'

And then execute:

$ bundle

Or install it yourself as:

$ gem install validation_annotations

Out of the box, by adding the following to your model (using ActiveModel::Validations):

class Product < ActiveRecord::Base
  validates_presence_of :title
end

When you use a form_helper method in your view like this:

f.text_field :title

It will render with a required='required' attribute in the html:

<input type="text" name="product[title]" required="required" />

If you would like to add attribute annotations for other validators, you simply need to add a add_html_annotations! instance method to the validator class. For example, if I wanted to add annotations for the validates_length_of:

module ActiveModel
  module Validations
    class LengthValidator
      def add_html_annotations!(options)
        options['data-val-length-min'] = minimum
        options['maxlength'] = maximum
      end
    end
  end
end

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