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 75
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
escape_javascript(javascript)

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

Source: show | on GitHub 

# File actionpack/lib/action_view/helpers/javascript_helper.rb, line 19
def escape_javascript(javascript)
  if javascript
    result = javascript.gsub(/(\\|<\/|\r\n|[\n\r"'])/) {|match| JS_ESCAPE_MAP[match] }
    javascript.html_safe? ? result.html_safe : result
  else
    ''
  end
end
j(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 50
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

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 “#” unles 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