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Formatting Rails form elements for Twitter Bootstrap error validation

View application.rb
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ActionView::Base.field_error_proc = Proc.new 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
else
html = %(<div class="clearfix error">#{html_tag}<span class="help-inline">&nbsp;#{instance.error_message}</span></div>).html_safe
end
end
end
html
end
View application.rb
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// Place all the styles related to the YourController controller here.
// They will automatically be included in application.css.
// You can use Sass (SCSS) here: http://sass-lang.com/
 
form .clearfix:before, form .clearfix:after {
display: inline;
}

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

Owner
t2 commented

Glad it helped!

I forked your version to https://gist.github.com/2645498 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 https://gist.github.com/dustMason/5817510 for Zurb Foundation 4. This version removes the Nokogiri dependency and thus performs better.

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