require 'active_support/core_ext/module/attr_internal' require 'active_support/core_ext/module/delegation' require 'active_support/core_ext/class/attribute' require 'active_support/core_ext/array/wrap' module ActionView #:nodoc: class NonConcattingString < ActiveSupport::SafeBuffer end # Action View templates can be written in three ways. If the template file has a .erb (or .rhtml) extension then it uses a mixture of ERb # (included in Ruby) and HTML. If the template file has a .builder (or .rxml) extension then Jim Weirich's Builder::XmlMarkup library is used. # If the template file has a .rjs extension then it will use ActionView::Helpers::PrototypeHelper::JavaScriptGenerator. # # = ERb # # You trigger ERb by using embeddings such as <% %>, <% -%>, and <%= %>. The <%= %> tag set is used when you want output. Consider the # following loop for names: # # Names of all the people # <% for person in @people %> # Name: <%= person.name %>
# <% end %> # # The loop is setup in regular embedding tags <% %> and the name is written using the output embedding tag <%= %>. Note that this # is not just a usage suggestion. Regular output functions like print or puts won't work with ERb templates. So this would be wrong: # # <%# WRONG %> # Hi, Mr. <% puts "Frodo" %> # # If you absolutely must write from within a function use +concat+. # # <%- and -%> suppress leading and trailing whitespace, including the trailing newline, and can be used interchangeably with <% and %>. # # == Using sub templates # # Using sub templates allows you to sidestep tedious replication and extract common display structures in shared templates. The # classic example is the use of a header and footer (even though the Action Pack-way would be to use Layouts): # # <%= render "shared/header" %> # Something really specific and terrific # <%= render "shared/footer" %> # # As you see, we use the output embeddings for the render methods. The render call itself will just return a string holding the # result of the rendering. The output embedding writes it to the current template. # # But you don't have to restrict yourself to static includes. Templates can share variables amongst themselves by using instance # variables defined using the regular embedding tags. Like this: # # <% @page_title = "A Wonderful Hello" %> # <%= render "shared/header" %> # # Now the header can pick up on the @page_title variable and use it for outputting a title tag: # # <%= @page_title %> # # == Passing local variables to sub templates # # You can pass local variables to sub templates by using a hash with the variable names as keys and the objects as values: # # <%= render "shared/header", { :headline => "Welcome", :person => person } %> # # These can now be accessed in shared/header with: # # Headline: <%= headline %> # First name: <%= person.first_name %> # # If you need to find out whether a certain local variable has been assigned a value in a particular render call, # you need to use the following pattern: # # <% if local_assigns.has_key? :headline %> # Headline: <%= headline %> # <% end %> # # Testing using defined? headline will not work. This is an implementation restriction. # # == Template caching # # By default, Rails will compile each template to a method in order to render it. When you alter a template, Rails will # check the file's modification time and recompile it. # # == Builder # # Builder templates are a more programmatic alternative to ERb. They are especially useful for generating XML content. An XmlMarkup object # named +xml+ is automatically made available to templates with a .builder extension. # # Here are some basic examples: # # xml.em("emphasized") # => emphasized # xml.em { xml.b("emph & bold") } # => emph & bold # xml.a("A Link", "href"=>"http://onestepback.org") # => A Link # xml.target("name"=>"compile", "option"=>"fast") # => # # NOTE: order of attributes is not specified. # # Any method with a block will be treated as an XML markup tag with nested markup in the block. For example, the following: # # xml.div { # xml.h1(@person.name) # xml.p(@person.bio) # } # # would produce something like: # #
#

David Heinemeier Hansson

#

A product of Danish Design during the Winter of '79...

#
# # A full-length RSS example actually used on Basecamp: # # xml.rss("version" => "2.0", "xmlns:dc" => "http://purl.org/dc/elements/1.1/") do # xml.channel do # xml.title(@feed_title) # xml.link(@url) # xml.description "Basecamp: Recent items" # xml.language "en-us" # xml.ttl "40" # # for item in @recent_items # xml.item do # xml.title(item_title(item)) # xml.description(item_description(item)) if item_description(item) # xml.pubDate(item_pubDate(item)) # xml.guid(@person.firm.account.url + @recent_items.url(item)) # xml.link(@person.firm.account.url + @recent_items.url(item)) # # xml.tag!("dc:creator", item.author_name) if item_has_creator?(item) # end # end # end # end # # More builder documentation can be found at http://builder.rubyforge.org. # # == JavaScriptGenerator # # JavaScriptGenerator templates end in .rjs. Unlike conventional templates which are used to # render the results of an action, these templates generate instructions on how to modify an already rendered page. This makes it easy to # modify multiple elements on your page in one declarative Ajax response. Actions with these templates are called in the background with Ajax # and make updates to the page where the request originated from. # # An instance of the JavaScriptGenerator object named +page+ is automatically made available to your template, which is implicitly wrapped in an ActionView::Helpers::PrototypeHelper#update_page block. # # When an .rjs action is called with +link_to_remote+, the generated JavaScript is automatically evaluated. Example: # # link_to_remote :url => {:action => 'delete'} # # The subsequently rendered delete.rjs might look like: # # page.replace_html 'sidebar', :partial => 'sidebar' # page.remove "person-#{@person.id}" # page.visual_effect :highlight, 'user-list' # # This refreshes the sidebar, removes a person element and highlights the user list. # # See the ActionView::Helpers::PrototypeHelper::GeneratorMethods documentation for more details. class Base module Subclasses end include Helpers, Rendering, Partials, Layouts, ::ERB::Util, Context extend ActiveSupport::Memoizable # Specify whether RJS responses should be wrapped in a try/catch block # that alert()s the caught exception (and then re-raises it). cattr_accessor :debug_rjs @@debug_rjs = false class_attribute :helpers remove_method :helpers attr_reader :helpers class_attribute :_router class << self delegate :erb_trim_mode=, :to => 'ActionView::Template::Handlers::ERB' delegate :logger, :to => 'ActionController::Base', :allow_nil => true end attr_accessor :base_path, :assigns, :template_extension, :lookup_context attr_internal :captures, :request, :controller, :template, :config delegate :find_template, :template_exists?, :formats, :formats=, :locale, :locale=, :view_paths, :view_paths=, :with_fallbacks, :update_details, :to => :lookup_context delegate :request_forgery_protection_token, :template, :params, :session, :cookies, :response, :headers, :flash, :action_name, :controller_name, :to => :controller delegate :logger, :to => :controller, :allow_nil => true # TODO: HACK FOR RJS def view_context self end def self.xss_safe? #:nodoc: true end def self.process_view_paths(value) ActionView::PathSet.new(Array.wrap(value)) end def initialize(lookup_context = nil, assigns_for_first_render = {}, controller = nil, formats = nil) #:nodoc: @config = nil @assigns = assigns_for_first_render.each { |key, value| instance_variable_set("@#{key}", value) } @helpers = self.class.helpers || Module.new if @_controller = controller @_request = controller.request if controller.respond_to?(:request) end @_config = ActiveSupport::InheritableOptions.new(controller.config) if controller && controller.respond_to?(:config) @_content_for = Hash.new { |h,k| h[k] = ActiveSupport::SafeBuffer.new } @_virtual_path = nil @lookup_context = lookup_context.is_a?(ActionView::LookupContext) ? lookup_context : ActionView::LookupContext.new(lookup_context) @lookup_context.formats = formats if formats end def controller_path @controller_path ||= controller && controller.controller_path end def punctuate_body!(part) flush_output_buffer response.body_parts << part nil end ActiveSupport.run_load_hooks(:action_view, self) end end