Helper for testing jquery tokeninput with Selenium & Capybara

tags_controller.rb

class TagsController < ApplicationController
  before_filter :authenticate_user!
  respond_to :json

  def index
    q = params[:tag]

    if q =~ %r{,|;}
      q.gsub!(%r{(,|;).*}, "")
      ActsAsTaggableOn::Tag.find_or_create_by_name(q)
    end

    @tags = ActsAsTaggableOn::Tag.named_like(q).limit(10)
    response = @tags.map { |t| { id: t.name, name: t.name } }

    render json: response
  end
end

token_input_helpers.rb

module TokenInputHelpers
  def fill_in_token_input(locator, options)
    raise "Must pass a hash containing 'with'" unless options.is_a?(Hash) && options.has_key?(:with)

    field = _find_fillable_field(locator)
    ti = _find_fillable_field("token-input-#{field[:id]}").native
    ti.clear

    options[:with].split(", ").each do |item|
      set_token_input(ti, item)

      xpath = "//*[contains(@class, 'token-input-dropdown')]//li[contains(normalize-space(string()), '#{item}')]"

      begin
        find(:xpath, xpath).click
      rescue Capybara::ElementNotFound # if nothing was found, try appending a semicolon to trigger tag creation, see controller code below
        set_token_input(ti, ";")
        find(:xpath, xpath).click
      end
    end
  end

  def set_token_input(input, text)
    input.send_keys(text)
  rescue
    page.driver.browser.execute_script %Q{
      var msg = '#{text}';
      $('##{input[:id]}').val(msg);
      var kp = jQuery.Event('keydown');
      kp.ctrlKey = false;
      kp.which = msg.charCodeAt(0);
      kp.keyCode = msg.charCodeAt(0);
      $('##{input[:id]}').trigger(kp);
    }
  end

  protected

  def _find_fillable_field(locator)
    find(:xpath, XPath::HTML.fillable_field(locator))
  end
end

World(RegistrationHelpers, InputHelpers)