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Extends gettext_i18n_rails, making your .PO files available to client side javascript as JSON. It will find translations inside your .js, .coffee, .handlebars and .mustache files, then it will create JSON versions of your .PO files so you can serve them with the rest of your assets, thus letting you access all your translations offline from client side javascript.


This gem is tested on the following versions, it's also possible that it works with older versions, but because of version bumps at gettext_i18n_rails and fast_gettext we have dropped the older versions from the testing matrix:

  • Ruby
    • 2.1.0
    • 2.2.0
  • Rails
    • 3.2.21
    • 4.0.13
    • 4.1.16
    • 4.2.7


gem "gettext_i18n_rails_js", "~> 1.2"


This library aims to adhere to Semantic Versioning 2.0.0. Violations of this scheme should be reported as bugs. Specifically, if a minor or patch version is released that breaks backward compatibility, a new version should be immediately released that restores compatibility. Breaking changes to the public API will only be introduced with new major versions.

As a result of this policy, you can (and should) specify a dependency on this gem using the Pessimistic Version Constraint with two digits of precision.

For example:

spec.add_dependency 'gettext_i18n_rails_js', '~> 1.2'


set up you rails application with gettext support as usual, afterwards just execute the following rake task to export your translations to JSON:

rake gettext:po_to_json

Per default this will reconstruct the locale/<lang>/app.po structure as javascript files inside app/assets/javascripts/locale/<lang>/app.js

The gem provides the Jed library to use the generated javascript files. It also provides a global __ function that maps to Jed#gettext. The Jed instance used by the client side __ function is pre-configured with the lang attribute specified in your main HTML tag. Before anything, make sure your page's HTML tag includes a valid lang attribute, for example:

%html{ manifest: "", lang: I18n.locale }

Once you're sure your page is configured with a locale, then you should add both your javascript locale files and the provided javascripts to your application.js

//= require_tree ./locale
//= require gettext/all

The default function name is window.__, to avoid conflicts with underscore.js. If you want to alias the function to something else in your javascript you should also instruct the javascript and coffeescript parser to look for a different function when finding your translations within the config file config/gettext_i18n_rails_js.yml, these are valid available options:

output_path: "app/assets/javascripts/locale"
handlebars_function: "__"
javascript_function: "__"
  pretty: false

If you prefer an initializer file within your rails application you can use that in favor of the YML configuration as well:

GettextI18nRailsJs.config do |config|
  config.output_path = "app/assets/javascripts/locale"

  config.handlebars_function = "__"
  config.javascript_function = "__"

  config.jed_options = {
    pretty: false


  • More deep testing against multiple Rails versions
  • Extend the current test suite, especially handlebars


Fork -> Patch -> Spec -> Push -> Pull Request





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