We’re on Rails (3.0.3 / 1.9) using Jammit for static compression and all the

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Asked: May 23, 20262026-05-23T14:57:37+00:00 2026-05-23T14:57:37+00:00

We’re on Rails (3.0.3 / 1.9) using Jammit for static compression and all the

0

We’re on Rails (3.0.3 / 1.9) using Jammit for static compression and all the other front-end goodies it provides.
I’m trying to work Javscript templates in to replace some ugly front-end code, but it looks like the default JST compiler can’t handle Windows line breaks:

assets.yml file:

embed_assets: on

javascripts:
  plugins:
  - app/views/**/*.jst

When I have _topicPreview.jst all on one line it compiles fine:

<div class='TopicPreview <%= typeName %>'><div class='Title'>   <%= summary %> </div><div class='Meta'>  <span class='LastUpdate'>    <%= updatedAt %>  </span>  <span class='PostCount'>    |     <%= postsCount %>     Posts     |  </span>   <span class='LikeCount'>    <%= likesCount %>     Likes  </span>  </div></div>

The page loads and I have the JST._topicPreview([JSON version of topic]) method available. Beautiful.

Half the appeal of JST is the readability / maintainability though, so I would like my JST to have proper formatting. As soon as I add line breaks into the JST file the page throws Uncaught SyntaxError: Unexpected Token ILLEGAL in window.JST['_topicPreview'] = template('...[the escaped JST file]...')

In the code trace I can see that it parses and escapes single quotes, so I was surprised it couldn’t handle the line breaks.

Has anyone else encountered this problem?
Is there a cleaner fix than hacking some extra string replaces into the template generation code?

Meta:
I’m pretty new to javascript templates, but should they have their own StackOverflow tag?

Edit

Looks like this is a known issue with a pending fix to be merged into the gem.

Windows line breaks in Jammit JST compiler