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ActionView::Helpers::JavaScriptHelper

Constants

JS_ESCAPE_MAP

Public Instance Methods

button_to_function(name, function=nil, html_options={}) click to toggle source

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" />
# File 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) click to toggle source

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' %>');
# File 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
Also aliased as: j
j(javascript) click to toggle source
Alias for: escape_javascript
javascript_tag(content_or_options_with_block = nil, html_options = {}, &block) click to toggle source

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 -%>
# File 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

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