Form builder for Twitter Bootstrap form elements.

bootstrap_form_builder.rb

class BootstrapFormBuilder < ActionView::Helpers::FormBuilder

  def get_error_text(object, field, options)
    if object.nil? || options[:hide_errors]
      ""
    else
      errors = object.errors[field.to_sym]
      if errors.empty? then "" else errors.first end
    end
  end

  def jquery_datetime_select(field, options = {})
    datetime_picker_script = "<script type='text/javascript'>" +
          "$( function() { " +
            "$('##{id}')" +
            ".datetimepicker( $.datepicker.regional[ 'en-NZ' ] )" +
            ".datetimepicker( 'setDate', new Date('#{date_time}') ); } );" +
        "</script>"
    return basic_datetime_select(field, options.merge({javascript: datetime_picker_script}))
  end

  def basic_datetime_select(field, options = {})
    input_class = options[:class] || 'date'
    placeholder_text = options[:placeholder_text] || 'Date'

    object = @template.instance_variable_get("@#{@object_name}")

    id = options[:id] || object.class.name.underscore + '_' + field.to_s

    errorText = get_error_text(object, field, options)
    wrapperClass = 'clearfix' + (errorText.empty? ? '' : ' error')
    errorSpan = if errorText.empty? then "" else "<span class='help-inline'>#{errorText}</span>" end
    label = label(field, options[:label])

    date_time = 
      if options['start_time']
        options['start_time']
      elsif object.nil?
        DateTime.now.utc
      else
        object.send(field.to_sym)
      end

    javascript = options['javascript'] || 
      "<script>$(function() { $('##{id}').val(new Date($('##{id}').val()).toString('dd MMM, yyyy HH:mm')) });</script>"

    ("<div class='#{wrapperClass}'>" + 
      label +
      "<div class='input'>" +
        super_text_field(field, {:id => id, :placeholder => placeholder_text, :value => date_time.to_s}.merge(options[:text_field] || {})) + 
        errorSpan +
        javascript +
      "</div>" +
    "</div>").html_safe
  end


  

  basic_helpers = %w{text_field text_area select email_field password_field check_box}

  multipart_helpers = %w{date_select datetime_select}

  basic_helpers.each do |name|
    # First alias old method
    class_eval("alias super_#{name.to_s} #{name}")

    define_method(name) do |field, *args|
      options = args.last.is_a?(Hash) ? args.pop : {}
      object = @template.instance_variable_get("@#{@object_name}")

      label = label(field, options[:label])
      errorText = get_error_text(object, field, options)

      wrapperClass = 'clearfix' + (errorText.empty? ? '' : ' error')
      errorSpan = if errorText.empty? then "" else "<span class='help-inline'>#{errorText}</span>" end 
      ("<div class='#{wrapperClass}'>" +
          label + 
          "<div class='input'>" + 
            super(field, options) +
            errorSpan +
          "</div>" +
        "</div>"
      ).html_safe
    end
  end  
  
  multipart_helpers.each do |name|
    define_method(name) do |field, *args|
      options = args.last.is_a?(Hash) ? args.pop : {}
      object = @template.instance_variable_get("@#{@object_name}")

      label = label(field, options[:label])
      
      errorText = get_error_text(object, field, options)

      wrapperClass = 'clearfix' + (errorText.empty? ? '' : ' error')
      errorSpan = if errorText.empty? then "" else "<span class='help-inline'>#{errorText}</span>" end 
      ("<div class='#{wrapperClass}'>" +
          label + 
          "<div class='input'>" + 
            "<div class='inline-inputs'>" +
              super(field, *args) +
              errorSpan +
            "</div>" +
          "</div>" +
        "</div>"
      ).html_safe
    end
  end

end