Question

Working with Rails 3.0, if one wanted to render some partial through javascript (in an AJAX call for example), one would escape the content like so

$('#some_id').html('<%= escape_javascript render(@post) %>');

and it would work, because escape_javascript escaped line breaks, quotes, and similar.

In Rails 3.1, the same method is escaping everything (including < for example), making it impossible for me to render content. Has this changed in 3.1? How do you do this?

Thanks in advance!

Answer 1

You’re probably on Rails 3.1.0.rc2 which was just released. There is a bug in escape_javascript that was fixed right after the release (https://github.com/rails/rails/issues/1553) but is not in a published release yet.
In the mean time, you can either revert to 3.1.0.rc1, or you can add an initializer to your project with the following:

module ActionView::Helpers::JavaScriptHelper
  def escape_javascript_with_workaround(javascript)
    escape_javascript_without_workaround(javascript.try(:to_str)).html_safe
  end

  alias_method_chain :escape_javascript, :workaround
end

UPDATE:

Rails 3.1.0.rc3 was released today which fixes this issue.