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require 'action_view/helpers/tag_helper'
require 'active_support/core_ext/string/encoding'
module ActionView
module Helpers
module JavaScriptHelper
JS_ESCAPE_MAP = {
'\\' => '\\\\',
'</' => '<\/',
"\r\n" => '\n',
"\n" => '\n',
"\r" => '\n',
'"' => '\\"',
"'" => "\\'"
}
JS_ESCAPE_MAP["\342\200\250".force_encoding('UTF-8').encode!] = '
'
# Escapes carriage 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
result = javascript.gsub(/(\\|<\/|\r\n|\342\200\250|[\n\r"'])/u) {|match| JS_ESCAPE_MAP[match] }
javascript.html_safe? ? result.html_safe : result
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=nil, 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 "#" unless +html_options+ has one.
#
# link_to_function "Greeting", "alert('Hello world!')", :class => "nav_link"
# # => <a class="nav_link" href="#" onclick="alert('Hello world!'); return false;">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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