require File.dirname(__FILE__) + '/tag_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 <%= javascript_include_tag :defaults %> in the HEAD # section of your page (recommended): This function will return # references to the JavaScript files created by the +rails+ command in # your public/javascripts directory. Using it is recommended as # the browser can then cache the libraries instead of fetching all the # functions anew on every request. # * Use <%= javascript_include_tag 'prototype' %>: 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 <%= define_javascript_functions %>: 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 # Returns a link that'll trigger a JavaScript +function+ using the # onclick handler and return false after the fact. # # Examples: # link_to_function "Greeting", "alert('Hello world!')" # link_to_function(image_tag("delete"), "if confirm('Really?'){ do_delete(); }") def link_to_function(name, function, html_options = {}) html_options.symbolize_keys! content_tag( "a", name, html_options.merge({ :href => html_options[:href] || "#", :onclick => (html_options[:onclick] ? "#{html_options[:onclick]}; " : "") + "#{function}; return false;" }) ) end # Returns a link that'll trigger a JavaScript +function+ using the # onclick handler. # # Examples: # button_to_function "Greeting", "alert('Hello world!')" # button_to_function "Delete", "if confirm('Really?'){ do_delete(); }") def button_to_function(name, function, html_options = {}) html_options.symbolize_keys! 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 ' end # Escape carrier returns and single and double quotes for JavaScript segments. def escape_javascript(javascript) (javascript || '').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')" # => def javascript_tag(content) content_tag("script", javascript_cdata_section(content), :type => "text/javascript") 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 end JavascriptHelper = JavaScriptHelper unless const_defined? :JavascriptHelper end end