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Formatting Rails form elements for Twitter Bootstrap error validation
ActionView::Base.field_error_proc = do |html_tag, instance|
html = %(<div class="field_with_errors">#{html_tag}</div>).html_safe
# add nokogiri gem to Gemfile
elements = Nokogiri::HTML::DocumentFragment.parse(html_tag).css "label, input"
elements.each do |e|
if e.node_name.eql? 'label'
html = %(<div class="clearfix error">#{e}</div>).html_safe
elsif e.node_name.eql? 'input'
if instance.error_message.kind_of?(Array)
html = %(<div class="clearfix error">#{html_tag}<span class="help-inline">&nbsp;#{instance.error_message.join(',')}</span></div>).html_safe
html = %(<div class="clearfix error">#{html_tag}<span class="help-inline">&nbsp;#{instance.error_message}</span></div>).html_safe
// Place all the styles related to the YourController controller here.
// They will automatically be included in application.css.
// You can use Sass (SCSS) here:
form .clearfix:before, form .clearfix:after {
display: inline;

Wow, great, it works excellent, thank you very much Trent!

t2 commented Jan 8, 2012

Glad it helped!


I forked your version to and it now does also textarea validation with latest Bootstrap.


The error message is below the error field, i.e. in a second line. How to place it in the same line as the error field?


This is great, thanks.


Forked to for Zurb Foundation 4. This version removes the Nokogiri dependency and thus performs better.

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