Ember.I18n

Internationalization for Ember

Requirements

Set Em.I18n.translations to an object containing your translation information. If you want to support inflection based on count, you will also need to include the CLDR.js pluralization library and set CLDR.defaultLanguage to the current locale code (e.g. "de").

Examples

Given

Em.I18n.translations = {
  'user.edit.title': 'Edit User',
  'user.followers.title.one': 'One Follower',
  'user.followers.title.other': 'All {{count}} Followers',
  'button.add_user.title': 'Add a user',
  'button.add_user.text': 'Add',
  'button.add_user.disabled': 'Saving...'
};

A simple translation:

<h2>{{t user.edit.title}}</h2>

yields

<h2><span id="i18n-123">Edit User</span></h2>

Remove the span by specifying a tagName:

{{t user.edit.title tagName="h2"}}

yields

<h2 id="i18n-123">Edit User</h2>

Set interpoloated values directly:

<h2>{{t user.followers.title count="2"}}</h2>

yields

<h2><span id="i18n-123">All 2 Followers</span></h2>

Bind interpolated values:

<h2>{{t user.followers.title countBinding="user.followers.count"}}</h2>

yields

<h2><span id="i18n-123">All 2 Followers</span></h2>

if user.getPath('followers.count) returns 2.

Translate properties on any object:

The Em.I18n.TranslateableProperties mixin automatically translates any property ending in "Translation":

userButton = Em.Object.extend(Em.I18n.TranslateableProperties, {
  labelTranslation: 'button.add_user.title'
});

userButton.get('label');

yields

"Add a user"

Translate attributes in a view:

Add the mixin Em.Button.reopen(Em.I18n.TranslateableAttributes) and use like this:

{{#view Em.Button titleTranslation="button.add_user.title">
  {{t button.add_user.text}}
{{/view}}

yields

<button title="Add a user">
  Add
</button>

Translate attributes on a plain tag:

<a {{translateAttr title="button.add_user.title"
                    data-disable-with="button.add_user.disabled"}}>
  {{t button.add_user.text}}
</a>

yields

<a title="Add a user" data-disable-with="Saving...">
  Add
</a>

Nested Translation Syntax:

The above translation data can also be expressed as nested JSON objects:

Em.I18n.translations = {
  'user': {
    'edit': {
      'title': 'Edit User'
    },
    'followers': {
      'title': {
        'one': 'One Follower',
        'other': 'All {{count}} Followers'
      }
    }
  },
  'button': {
    'add_user': {
      'title': 'Add a user',
      'text': 'Add',
      'disabled': 'Saving...'
    }
  }
};

This format is often smaller and so makes downloading translation packs faster.

Limitations

• There is no way to pass interpolations to attribute translations. I can't think of a syntax to support this. It might be possible to look up interpolations from the current context.
• Em.I18n.translations must be fully populated before Ember renders any views. There are no bindings on the translations themselves, so Ember will not know to re-render views when translations change.

Building

For more detail on running tests and contributing, see CONTRIBUTING.md.