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require 'action_view/helpers/tag_helper'
require 'action_view/helpers/prototype_helper'
module ActionView
module Helpers
# Provides functionality for working with JavaScript in your views.
#
# == Ajax, controls and visual effects
#
# * For information on using Ajax, see
# ActionView::Helpers::PrototypeHelper.
# * For information on using controls and visual effects, see
# ActionView::Helpers::ScriptaculousHelper.
#
# == Including the JavaScript libraries into your pages
#
# Rails includes the Prototype JavaScript framework and the Scriptaculous
# JavaScript controls and visual effects library. If you wish to use
# these libraries and their helpers (ActionView::Helpers::PrototypeHelper
# and ActionView::Helpers::ScriptaculousHelper), you must do one of the
# following:
#
# * Use <tt><%= javascript_include_tag :defaults %></tt> in the HEAD
# section of your page (recommended): This function will return
# references to the JavaScript files created by the +rails+ command in
# your <tt>public/javascripts</tt> directory. Using it is recommended as
# the browser can then cache the libraries instead of fetching all the
# functions anew on every request.
# * Use <tt><%= javascript_include_tag 'prototype' %></tt>: As above, but
# will only include the Prototype core library, which means you are able
# to use all basic AJAX functionality. For the Scriptaculous-based
# JavaScript helpers, like visual effects, autocompletion, drag and drop
# and so on, you should use the method described above.
# * Use <tt><%= define_javascript_functions %></tt>: this will copy all the
# JavaScript support functions within a single script block. Not
# recommended.
#
# For documentation on +javascript_include_tag+ see
# ActionView::Helpers::AssetTagHelper.
module JavaScriptHelper
unless const_defined? :JAVASCRIPT_PATH
JAVASCRIPT_PATH = File.join(File.dirname(__FILE__), 'javascripts')
end
include PrototypeHelper
# Returns a link that will trigger a JavaScript +function+ using the
# onclick handler and return false after the fact.
#
# The +function+ argument can be omitted in favor of an +update_page+
# block, which evaluates to a string when the template is rendered
# (instead of making an Ajax request first).
#
# Examples:
# link_to_function "Greeting", "alert('Hello world!')"
# Produces:
# <a onclick="alert('Hello world!'); return false;" href="#">Greeting</a>
#
# link_to_function(image_tag("delete"), "if (confirm('Really?')) do_delete()")
# Produces:
# <a onclick="if (confirm('Really?')) do_delete(); return false;" href="#">
# <img src="/images/delete.png?" alt="Delete"/>
# </a>
#
# link_to_function("Show me more", nil, :id => "more_link") do |page|
# page[:details].visual_effect :toggle_blind
# page[:more_link].replace_html "Show me less"
# end
# Produces:
# <a href="#" id="more_link" onclick="try {
# $("details").visualEffect("toggle_blind");
# $("more_link").update("Show me less");
# }
# catch (e) {
# alert('RJS error:\n\n' + e.toString());
# alert('$(\"details\").visualEffect(\"toggle_blind\");
# \n$(\"more_link\").update(\"Show me less\");');
# throw e
# };
# return false;">Show me more</a>
#
def link_to_function(name, *args, &block)
html_options = args.extract_options!
function = args[0] || ''
html_options.symbolize_keys!
function = update_page(&block) if block_given?
content_tag(
"a", name,
html_options.merge({
:href => html_options[:href] || "#",
:onclick => (html_options[:onclick] ? "#{html_options[:onclick]}; " : "") + "#{function}; return false;"
})
)
end
# Returns a button that'll trigger a JavaScript +function+ using the
# onclick handler.
#
# The +function+ argument can be omitted in favor of an +update_page+
# block, which evaluates to a string when the template is rendered
# (instead of making an Ajax request first).
#
# Examples:
# button_to_function "Greeting", "alert('Hello world!')"
# button_to_function "Delete", "if (confirm('Really?')) do_delete()"
# button_to_function "Details" do |page|
# page[:details].visual_effect :toggle_slide
# end
# button_to_function "Details", :class => "details_button" do |page|
# page[:details].visual_effect :toggle_slide
# end
def button_to_function(name, *args, &block)
html_options = args.extract_options!
function = args[0] || ''
html_options.symbolize_keys!
function = update_page(&block) if block_given?
tag(:input, html_options.merge({
:type => "button", :value => name,
:onclick => (html_options[:onclick] ? "#{html_options[:onclick]}; " : "") + "#{function};"
}))
end
# Includes the Action Pack JavaScript libraries inside a single <script>
# tag. The function first includes prototype.js and then its core extensions,
# (determined by filenames starting with "prototype").
# Afterwards, any additional scripts will be included in undefined order.
#
# Note: The recommended approach is to copy the contents of
# lib/action_view/helpers/javascripts/ into your application's
# public/javascripts/ directory, and use +javascript_include_tag+ to
# create remote <script> links.
def define_javascript_functions
javascript = "<script type=\"#{Mime::JS}\">"
# load prototype.js and its extensions first
prototype_libs = Dir.glob(File.join(JAVASCRIPT_PATH, 'prototype*')).sort.reverse
prototype_libs.each do |filename|
javascript << "\n" << IO.read(filename)
end
# load other librairies
(Dir.glob(File.join(JAVASCRIPT_PATH, '*')) - prototype_libs).each do |filename|
javascript << "\n" << IO.read(filename)
end
javascript << '</script>'
end
# Escape carrier returns and single and double quotes for JavaScript segments.
def escape_javascript(javascript)
(javascript || '').gsub('\\','\0\0').gsub('</','<\/').gsub(/\r\n|\n|\r/, "\\n").gsub(/["']/) { |m| "\\#{m}" }
end
# Returns a JavaScript tag with the +content+ inside. Example:
# javascript_tag "alert('All is good')"
#
# Returns:
# <script type="text/javascript">
# //<![CDATA[
# alert('All is good')
# //]]>
# </script>
#
# +html_options+ may be a hash of attributes for the <script> tag. Example:
# javascript_tag "alert('All is good')", :defer => 'defer'
# # => <script defer="defer" type="text/javascript">alert('All is good')</script>
#
# Instead of passing the content as an argument, you can also use a block
# in which case, you pass your +html_options+ as the first parameter.
# <% javascript_tag :defer => 'defer' do -%>
# alert('All is good')
# <% end -%>
def javascript_tag(content_or_options_with_block = nil, html_options = {}, &block)
if block_given?
html_options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
content = capture(&block)
else
content = content_or_options_with_block
end
javascript_tag = content_tag("script", javascript_cdata_section(content), html_options.merge(:type => Mime::JS))
if block_given? && block_is_within_action_view?(block)
concat(javascript_tag, block.binding)
else
javascript_tag
end
end
def javascript_cdata_section(content) #:nodoc:
"\n//#{cdata_section("\n#{content}\n//")}\n"
end
protected
def options_for_javascript(options)
'{' + options.map {|k, v| "#{k}:#{v}"}.sort.join(', ') + '}'
end
def array_or_string_for_javascript(option)
js_option = if option.kind_of?(Array)
"['#{option.join('\',\'')}']"
elsif !option.nil?
"'#{option}'"
end
js_option
end
private
def block_is_within_action_view?(block)
eval("defined? _erbout", block.binding)
end
end
JavascriptHelper = JavaScriptHelper unless const_defined? :JavascriptHelper
end
end
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