Rails plugin that maps model validations to class names on form elements to integrate with Validatious. IMPORTANT: Project is not maintained anymore.
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Rails plugin that maps model validations to class names on form elements to integrate with Validatious.

What Is Validatious?

Elevator pitch: A (kick-ass) unobtrusive client-side validation javascript library – the only one you’ll ever need.


…So What Is Validatious-On-Rails?

Elevator pitch: A (kick-ass) seamless “glue” between ActiveRecord and Validatious: Automatically maps models validations to client-side Validatious-validators – and when client-side won’t work: Validatious-backed AJAX validators – on form elements in a obtrusive way using DOM classes. Makes your form-filling users happier, and you code cleaner and more scalable (tjing-tjing!). Why define client-side validations “once-again”, when they already defined in the model?

Features & Goals

Current Features:

  • Rails core validations
    • Client-side
      • validates_acceptance_of – except: :on, :if/:unless
      • validates_confirmation_of – except: :on, :if/:unless
      • validates_exclusion_of – except: :on, :if/:unless
      • validates_format_of – except: :on, :if/:unless
      • validates_inclusion_of – except: :on, :if/:unless
      • validates_length_of – except: :on, :if/:unless
      • validates_numericality_of – except: :on, :if/:unless
      • validates_presence_of – except :on, :if/:unless
      • validates_size_of – except :on, :if/:unless
    • Remote (AJAX)
      • validates_uniqueness_of (remote validations a bit unstable still, work in progress but works “okay”) =)
  • Client-side & remote (AJAX) validations hand-in-hand: You won’t notice, it’s all taken care of seamlessly. When it works client-side; that is used. When more complex stuff is happening; an AJAX request is performed under the hood.
  • Supports all Rails core form field helpers.
  • Remote validators (AJAX) use Rails core validations, so the API for additional validations is very clean – seamless actually.
  • Seamless Rails I18n integration (validation error messages).
  • Generator for getting started – easy as 1-2-3 (see below).
  • Custom client-side and AJAX validators API (announced soon, not documented yet).
  • Client-side validations can easily be disabled for specific fields.
  • Ruby 1.9.x support (note: Rails 2.3.4 + Ruby 1.9.1 + validatious-on-rails don’t work – because of a known Rails 2.3.4-bug)
  • JavaScript framework agnostic.
  • Test-suit.
  • Bonus: For Formtastic form-builder users like me: With default config, it’s compatible with the Formtastic semantic HTML structure.

Note: This project is under heavy development; a lot of experimenting going on – things might change under the hood. See the TODO for more info. Please help out file any issues/problems.


  • Should support all Rails core validations (using preferably client-side validation, or last-resort solution using server-side validation – backed by Validatious)
  • Should be very easy to extend with custom validations (plugins, e.g. Validatious::Validators.add MyCustomValidator), but within the domain of Validatious (focus) – no vision of support multiple libraries (only makes the code base unnecessary big and complex)
  • Support all Rails core form helpers, but should also be easy to extend with custom form field helpers.
  • Should not only perform the validations, but also respect the Rails validation options
  • Should integrate with the Rails I18n API seamlessly
  • Should have solid test suit

Note: Somethings fundamental is missing? Let me know! =)

Known Issues

  • Not Rails 3-compatible – and it’s most probably not a quick-fix either as quite much happened in the Rails 3 model validations API (kind of rewritten).
  • Remote validations (validates_uniqueness_of, …) is not super stable, but I’m sure it will be very soon. Help me out by reporting issues you have, or submitting a patch – or two. =)



sudo gem install validatious-on-rails --source http://gemcutter.org

and in config/environment.rb:

config.gem 'validatious-on-rails', :source => 'http://gemcutter.org'


./script/plugin install git://github.com/grimen/validatious-on-rails.git


Note: For testing, get: context, rr, acts_as_fu, and redgreen.


1. Generate required javascript files

$ ./script/generate v2
      create  config/initializers/validatious-on-rails.rb
      create  public/javascripts/XMLHttpRequest.js
      create  public/javascripts/v2.standalone.full.min.js
      create  public/javascripts/v2.config.js
      create  public/javascripts/v2.rails.js

Note: ./script/generate v2 <=> ./script/generate validatious

Important: It is very impostant that you do this (update these scripts) on each new gem release; especially v2.rails will be a subject for change because this library contains kind of low level helpers to get Validatious and additional features such as AJAX validations to play. I’m not sure what might be added/removed in the future, but as long as you keep these updated you probably won’t notice any difference.

2. Include the javascripts in your layout

app/views/application.html.erb or similar:

  <%= javascript_include_tag 'XMLHttpRequest' ,'v2.standalone.full.min', 'v2.config', 'v2.rails' %>
  <%= javascript_for_validatious %>


  • XMLHttpRequest.js – Unobtrusive cross-browser implementation of the native XMLHttpRequest (remote validations only, not required for client-side validations).
  • v2.standalone.full.min.jsValidatious Core API with included extensions: Reporting, HTML, and DSL.
  • v2.config.js – Default Valdiatious-configuration that easily can be tweaked or extended – see Validatious documentation.
  • v2.rails.js – Helpers to get remote AJAX validations to work without any configuration.
  • javascript_for_validatious – This is where custom validations – and any additional meta data associated with these – gets inserted. No worries; the plugin is doing the magic!



Consider you got some model validations:

class Post < ActiveRecord::Base
  validates_presence_of :title
  validates_uniqueness_of :title
  validates_length_of :title, :within => 3..20
  validates_length_of :body, :within => 3..20, :client_side => false

…then you now got working client-side validations for any forms with class validate (or any custom class – see documentation/config):

<% form_for(@post, :html => {:class => 'validate'}) do |f| %>
  <%= f.text_field :title %>  # Validated performed using client-side. Note: uniqueness-check is performed using an AJAX-request.
  <%= f.text_area :body %>    # No client-side validation performed, i.e. ignored.
<% end %>

Validatious ♥ Formtastic

For all you Formtastic users out there: This plugin is out-of-the-box compatible with Formtastic – unlike the similar solution(s) out there. But to get Validatious and Formtastic to play well with each other, you need to tweak the configuration settings a bit. These settings are very much recommended:


Formtastic::SemanticFormBuilder.inline_errors = :list
Formtastic::SemanticFormBuilder.inline_order  = [:input, :hints, :errors]


v2.Field.prototype.positionErrorsAbove = false;
v2.Fieldset.prototype.positionErrorsAbove = false;
v2.Fieldset.prototype.messagesClass = 'errors';
v2.Fieldset.prototype.failureClass = 'error';
v2.Fieldset.prototype.successClass = '';
v2.Field.prototype.messagesClass = 'errors';
v2.Field.prototype.failureClass = 'error';
v2.Field.prototype.successClass = '';

Actually, Validatious errors can be tweaked to work with any form builder/markup, but how that is done is out of context for this plugin. For more info; checkout the documentation for the Validatious Reporting extension.


This is very much work-in-progress, so there are some known limitations that should work very soon. See TODO.


This project was originally forked from:



Original work:

Released under the MIT license.
Copyright © 2008 Christian Johansen

Additional work:

Released under the MIT license.
Copyright © 2009 Jonas Grimfelt

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