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require 'action_view/helpers/tag_helper'
module ActionView
# = Action View JavaScript Helpers
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.
#
# For documentation on +javascript_include_tag+ see
# ActionView::Helpers::AssetTagHelper.
module JavaScriptHelper
include PrototypeHelper
JS_ESCAPE_MAP = {
'\\' => '\\\\',
'</' => '<\/',
"\r\n" => '\n',
"\n" => '\n',
"\r" => '\n',
'"' => '\\"',
"'" => "\\'" }
# Escape carrier returns and single and double quotes for JavaScript segments.
# Also available through the alias j(). This is particularly helpful in JavaScript responses, like:
#
# $('some_element').replaceWith('<%=j render 'some/element_template' %>');
def escape_javascript(javascript)
if javascript
javascript.gsub(/(\\|<\/|\r\n|[\n\r"'])/) { JS_ESCAPE_MAP[$1] }
else
''
end
end
alias_method :j, :escape_javascript
# 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 <tt>\<script></tt>
# 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)
content =
if block_given?
html_options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
capture(&block)
else
content_or_options_with_block
end
content_tag(:script, javascript_cdata_section(content), html_options.merge(:type => Mime::JS))
end
def javascript_cdata_section(content) #:nodoc:
"\n//#{cdata_section("\n#{content}\n//")}\n".html_safe
end
# Returns a button whose +onclick+ handler triggers the passed JavaScript.
#
# The helper receives a name, JavaScript code, and an optional hash of HTML options. The
# name is used as button label and the JavaScript code goes into its +onclick+ attribute.
# If +html_options+ has an <tt>:onclick</tt>, that one is put before +function+.
#
# button_to_function "Greeting", "alert('Hello world!')", :class => "ok"
# # => <input class="ok" onclick="alert('Hello world!');" type="button" value="Greeting" />
#
def button_to_function(name, function='', html_options={})
onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function};"
tag(:input, html_options.merge(:type => 'button', :value => name, :onclick => onclick))
end
# Returns a link whose +onclick+ handler triggers the passed JavaScript.
#
# The helper receives a name, JavaScript code, and an optional hash of HTML options. The
# name is used as the link text and the JavaScript code goes into the +onclick+ attribute.
# If +html_options+ has an <tt>:onclick</tt>, that one is put before +function+. Once all
# the JavaScript is set, the helper appends "; return false;".
#
# The +href+ attribute of the tag is set to "#" unles +html_options+ has one.
#
# link_to_function "Greeting", "alert('Hello world!')", :class => "nav_link"
# Produces:
# <a onclick="alert('Hello world!'); return false;" href="#" class="nav_link">Greeting</a>
def link_to_function(name, function, html_options={})
onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function}; return false;"
href = html_options[:href] || '#'
content_tag(:a, name, html_options.merge(:href => href, :onclick => onclick))
end
end
end
end
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