prototip_helper.rb

module PrototipHelper

# Created by Steve Schwartz [1] (for Alfa Jango, LLC [2]) for the Scriptaculous Prototip tooltip library by Nick Stakenburg [3].
#
#  [1] http://github.com/jangosteve
#  [2] http://www.alfajango.com
#  [3] http://www.nickstakenburg.com/projects/prototip2/

# Using this in your views:
# <%= prototip( "target_id_to_attach_prototip", 
#               "Prototip content (may be HTML)", 
#               {
#                  :title => "Prototip Title", 
#                  :close_button => true, 
#                  :hide_on => {:element => 'target', :event => 'click'}, 
#                  :hide_after => 1, 
#                  :hide_others => true, 
#                  :stem => 'left_top', 
#                  :hook => { :tip => 'top_left', :target => 'right_top' } }) %>

# creates the following code:
# <script type='text/javascript'>
#    try {
#       new Tip( 'target_id_to_attach_prototip', 
#                'Prototip content (may be HTML)', 
#                { hideOn: {event: 'click',element: 'target'},
#                stem: 'leftTop',
#                hideAfter: 1.0,
#                hook: {tip: 'topLeft',target: 'rightTop'},
#                hideOthers: true,
#                title: 'Prototip Title',
#                style: 'protogrey',
#                closeButton: true });
#    } 
#    catch(err) {}
# </script>


   def prototip(target_id,body,options={})
      options = default_options.merge!(options)
      option_params = ""
      options.each do |key, value|
         unless value.kind_of?(Hash) && value.size > 1
            value = key == :title ? normalize_value(value, false) : normalize_value(value)
            option_params += "#{key.to_s.camelize(:lower)}: #{value.to_s},"
         else
            option_params += "#{key.to_s.camelize(:lower)}: {"
            value.each do |k,v|
               v = key == :title ? normalize_value(v, false) : normalize_value(v)
               option_params += k.to_s.camelize(:lower) + ": " + v.to_s + ","
            end
            option_params = option_params.chop + "},"
         end
      end
      option_params.chop!
      
      out = "<script type='text/javascript'>"
      out += "try {new Tip('#{target_id}', '#{nl2br(body)}', { #{option_params} });} catch(err) {}"
      out += "</script>"
   end
   
   def default_options
      {  :style => 'protogrey',
         :stem => 'top_left',
         :hook => { :tip => 'top_left', :target => 'bottom_middle' }
      }
   end
   
   def normalize_value(value, camel=true)
      value = case
         when value.is_a?(String) : "'#{camel ? value.camelize(:lower) : value}'"
         when value.is_a?(Numeric) : sprintf("%.1f",value)
         else value
      end
   end

end