Use Slim with Rails helpers in the asset pipeline
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Use slim to write your Javascript templates


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Writing Javascript templates for Backbone.js (or other frameworks) in your app? Would you like to use slim and the asset pipeline?

This gem adds slim templating support to the Rails 3.1 asset pipeline. This gem works with the EJS gem and JST asset engine to make your slim available as a compiled Javascript template.


Add this to your Gemfile

gem 'slim_assets'
gem 'ejs'
gem 'slim'

Using slim for your Javascript templates

Templates directory

You should locate your templates under app/assets; we suggest app/assets/templates. In your Javascript manifest file (for example application.js), use require_tree

//= require_tree ../templates

The template file

Inside your templates directory, add your template file. The file should be named as follows


The asset pipeline will then generate the actual Javascript asset

  1. Convert your slim to HTML
  2. Compile the HTML to an EJS Javascript template
  3. Add the template to the JST global under the templates name

Important! The asset pipeline is not invoking a controller to generate the templates. If you are using existing view templates, you may have to edit templates to remove some references to controller helpers.


In your template file you can use the EJS delimiters as you would normally. If you want to use them in attributes mark the attribute html_safe.

= f.text_field :email, class: 'text', value: '<%= email %>'.html_safe


All the ActionView and route helpers are available in your template. If you use form_for and the related helpers, you should use the new object form, even if you are writing an edit form, for example

= form_for :contact, url: "javascript_not_working", html: {:class => :edit_contact, :method => :put} do |f|
    = f.label :name, "Name"
    = f.text_field :name, class: 'text required', autofocus: true, value: '<%= name %>'.html_safe


  • Les Hill : @leshill
  • Wes Gibbs : @wgibbs

This gem is heavily based on their haml_assets gem

About the Author

Crowd Interactive is a web design and development company that happens to work in Colima, Mexico. We specialize in building and growing online retail stores. We don’t work with everyone – just companies we believe in. Call us today to see if there’s a fit. Find more info here!