Methods
B
E
J
L
Constants
JS_ESCAPE_MAP = { '\\' => '\\\\', '</' => '<\/', "\r\n" => '\n', "\n" => '\n', "\r" => '\n', '"' => '\\"', "'" => "\\'" }
Instance Public methods
button_to_function(name, function=nil, html_options={})

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 :onclick, 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" />

Source: show | on GitHub 

    # File actionpack/lib/action_view/helpers/javascript_helper.rb, line 84
84:       def button_to_function(name, function=nil, html_options={})
85:         ActiveSupport::Deprecation.warn("button_to_function is deprecated and will be removed from Rails 4.0")
86: 
87:         onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function};"
88: 
89:         tag(:input, html_options.merge(:type => 'button', :value => name, :onclick => onclick))
90:       end
escape_javascript(javascript)

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' %>');
This method is also aliased as j

Source: show | on GitHub 

    # File actionpack/lib/action_view/helpers/javascript_helper.rb, line 28
28:       def escape_javascript(javascript)
29:         if javascript
30:           result = javascript.gsub(/(\\|<\/|\r\n|\342\200\250|[\n\r"'])/u) {|match| JS_ESCAPE_MAP[match] }
31:           javascript.html_safe? ? result.html_safe : result
32:         else
33:           ''
34:         end
35:       end
j(javascript)

Alias for escape_javascript

javascript_tag(content_or_options_with_block = nil, html_options = {}, &block)

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 -%>

Source: show | on GitHub 

    # File actionpack/lib/action_view/helpers/javascript_helper.rb, line 59
59:       def javascript_tag(content_or_options_with_block = nil, html_options = {}, &block)
60:         content =
61:           if block_given?
62:             html_options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
63:             capture(&block)
64:           else
65:             content_or_options_with_block
66:           end
67: 
68:         content_tag(:script, javascript_cdata_section(content), html_options.merge(:type => Mime::JS))
69:       end
link_to_function(name, function, html_options={})

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 :onclick, 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>

Source: show | on GitHub 

     # File actionpack/lib/action_view/helpers/javascript_helper.rb, line 104
104:       def link_to_function(name, function, html_options={})
105:         ActiveSupport::Deprecation.warn("link_to_function is deprecated and will be removed from Rails 4.0")
106: 
107:         onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function}; return false;"
108:         href = html_options[:href] || '#'
109: 
110:         content_tag(:a, name, html_options.merge(:href => href, :onclick => onclick))
111:       end