ember-intl

ember-intl

This library provides Ember Handlebar helpers and a localization service. The service, and helpers, provide a way to format dates, numbers, strings messages, including pluralization.

Ember-Intl 2.0

This README is targeting and explaining the 2.0 API which differs from previous versions and the latest stable release. If you are looking for the 1.3.x documentation, please check here.

Overview

Ember Intl is part of FormatJS, the docs can be found on the website:

http://formatjs.io/ember/

Requirements

• Ember-cli >= 0.2.0
• Ember >= 1.10.x <= 1.13.x
• HTMLBars (Glimmer supported)

Installation

• ember install ember-intl@2.0.0-beta.10 (or ember install:addon ember-intl@2.0.0-beta.10 for ember-cli < v0.2.3)
• If you are targeting a browser that doesn't support the native Intl API (such as Safari or PhantomJS), you need to load the shim. The Intl.JS polyfill is automatically added into the asset distribution folder at build time.
  • If your application does not support browsers which do not implement the Intl API, you can speed up your builds by disabling the polyfill.

<script src="assets/intl/intl.min.js"></script>
<script src="assets/intl/locales/en-us.js"></script>
<script src="assets/intl/locales/fr-fr.js"></script>
<script src="assets/intl/locales/es-es.js"></script>
<!--
You can view the full list of CLDR locales which can be accessed from the `/assets/intl` folder
of your application.  The CLDRs are automatically placed there at build time.  Typically this folder
on your filesystem is ``<project>/dist/assets/intl`

Full list: https://github.com/yahoo/formatjs-extract-cldr-data/tree/master/data/main
-->

Translations

Translations are defined in /translations, outside of app in either JSON or YAML format. Example of /translations/en-us.yaml:

# en-us
product:
  info: '{product} will cost {price, number, USD} if ordered by {deadline, date, time}'
  title: 'Hello world!'
  html:
    info: '<strong>{product}</strong> will cost <em>{price, number, USD}</em> if ordered by {deadline, date, time}'

Configure application-wide locale

Open, or create, app/routes/application.js and in the beforeModel hook set intl.locale. Example:

  // app/routes/application.js
  export default Ember.Route.extend({
    intl: Ember.inject.service(),
    beforeModel() {
      // define the app's runtime locale
      // For example, here you would maybe do an API lookup to resolver
      // which locale the user should be targeted and perhaps lazily
      // load translations using XHR and calling intl's `addMessage`/`addMessages`
      // method with the results of the XHR request
      this.set('intl.locale', 'en-us');
    }
  });

• A default locale is required. This is used as the "source of truth" to determine if any translations are missing a translation at build time. It will offer warnings displaying with locale's are missing translations for a particular key. The default locale is configurable within config/environment.js.

// config/environment.js
return {
  intl: {
    defaultLocale: 'en-us' // default value
  }
};

Examples

Format Number

Formats numbers using Intl.NumberFormat, and returns the formatted string value.

{{format-number num}}
{{format-number num format='EUR'}}
{{format-number num style='currency' currency='USD'}}

Or programmatically convert a number within any Ember Object.

// example
export default Ember.Component.extend({
  intl: Ember.inject.service(),
  computedNumber: Ember.computed('cost', function() {
    return this.get('intl').formatNumber(this.get('cost')/*, optional options hash */);
  })
});

Format Number Options

List of supported format number options

Format Date

Formats dates using Intl.DateTimeFormat, and returns the formatted string value.

{{format-date now weekday='long' timeZone='UTC'}}
{{format-date now hour='numeric' minute='numeric' hour12=false}}

Or programmatically convert a date within any Ember Object.

// example
export default Ember.Component.extend({
  intl: Ember.inject.service(),
  computedNow: Ember.computed(function() {
    return this.get('intl').formatDate(new Date()/*, optional options hash */);
  })
});

Format Date Options

List of supported format date options

Format Time

This is just like the {{format-date}} helper, except it will reference any string-named format from formats.time.

{{format-time now format='hhmmss'}}
{{format-time now hour='numeric' minute='numeric' hour12=false}}

Or programmatically convert a time within any Ember Object.

// example
export default Ember.Component.extend({
  intl: Ember.inject.service(),
  computedNow: Ember.computed(function() {
    return this.get('intl').formatTime(new Date()/*, optional options hash */);
  })
});

Format Time Options

List of supported format date options

Format Relative

Formats dates relative to "now" using IntlRelativeFormat, and returns the formatted string value.

export default Ember.Component.extend({
  timestamp: Ember.computed(function() {
    var date = new Date();
    date.setDate(date.getDate() - 3);
    return date;
  })
});

{{format-relative timestamp}} -> 3 days ago

Or programmatically convert a relative time within any Ember Object.

// example
export default Ember.Component.extend({
  intl: Ember.inject.service(),
  yesterday: Ember.computed(function() {
    var date = new Date();
    return this.get('intl').formatRelative(date.setDate(date.getDate() - 1)/*, optional options hash */);
  })
});

Format Relative Options

List of supported format date options

Format Message

Formats ICU Message strings with the given values supplied as the hash arguments.

You have {numPhotos, plural,
	=0 {no photos.}
	=1 {one photo.}
	other {# photos.}}

{{format-message (intl-get 'product.info')
	product='Apple watch'
	price=200
	deadline=yesterday}}

{{format-message boundProperty
	name='Jason'
	numPhotos=num
	takenDate=yesterday}}

Or programmatically convert a message within any Ember Object.

export default Ember.Component.extend({
  intl: Ember.inject.service(),
  yesterday: Ember.computed(function() {
    var now = new Date();
    return this.get('intl').formatMessage('Hello {name}', { name: 'Jason' });
  })
});

Format HTML Message

This delegates to the {{format-message}} helper, but will first HTML-escape all of the hash argument values. This allows the message string to contain HTML and it will be considered safe since it's part of the template and not user-supplied data.

{{format-html-message (intl-get 'product.html.info')
	product='Apple watch'
	price=200
	deadline=yesterday}}

{{format-html-message '<strong>{numPhotos}</strong>'
	numPhotos=(format-number num)}}

Intl-Get

Utility helper for returning the value, or eventual value, based on a translation key. Should only ever be used as a subexpression, never as a standalone helper.

{{format-message (intl-get 'product.info')
	product='Apple watch'
	price=200
	deadline=yesterday}}

Will return the message from the current locale, or locale explicitly passed as an argument, message object.

product:
  info: '{product} will cost {price, number, EUR} if ordered by {deadline, date, time}'

Disable Polyfill

// config/environment.js
module.exports = function() {
  return {
    intl: {
      disablePolyfill: true
    }
  };
};

Change output path for Polyfill and CLDR Data

// Brocfile.js
var app = new EmberApp({
  outputPaths: {
    intl: '/assets/intl' // default
  }
});

Known Gotchas

date value is not finite in DateTimeFormat.format()

Browser vendors implement date/time parsing differently. For example, the following will parse correctly in Chrome but fail in Firefox: new Intl.DateTimeFormat().format('2015-04-21 20:47:31 GMT');

The solution is the ensure that the value you are passing in is in a format which is valid for the Date constructor. This library currently does not try and normalize date strings outside of what the browser already implements.

Helper Options

• All helpers accept optional arguments:
  • locale argument to explicitly pass/override the application locale
  • format argument which you pass in a key corresponding to a format configuration in app/formats.js

Writing Unit Tests

If using the intl helpers within a components or views that is unit tested, needs the service, helper, and formatter into the unit test.

In the setup hook of moduleFor/moduleForComponent you'll want to also invoke registerIntl(container); -- which is a utility function to setup the injection logic on the unit test container.

NOTE: Add the following above all script tags in tests/index.html

<script src="assets/intl/intl.complete.js"></script>

This is to shim your test runner if running within phantomjs, or any browser which does not natively support the Intl API.

Example unit test

/**
 * unit test for testing index view which contains the helpers: `format-message` and `intl-get`
 *
 * unit/views/index-test.js
 */
import Ember from 'ember';

import { registerIntl } from '../../../initializers/ember-intl';

import {
  moduleFor,
  test
} from 'ember-qunit';

moduleFor('view:index', 'IndexView', {
  needs: [
    'template:index',
    'ember-intl@adapter:-intl-adapter',
    'service:intl',
    'helper:intl-get',
    'ember-intl@formatter:format-message',
    'translation:en-us',
    'translation:es-es'
  ],
  setup: function () {
    // depending on your test library, container will be hanging off `this`
    // or otherwise passed in as the first argument
    var container = this.container || arguments[0];
    // injects the service on to all logical factory types
    registerIntl(container);

    // set the initial intl service locale to `en-us`
    var intl = container.lookup('service:intl');
    intl.set('locale', 'en-us');
  }
});

test('index renders', function () {
  expect(2);

  var view = this.subject({
    context: Ember.Object.create({
      firstName: 'Tom'
    })
  });

  var intl = view.get('intl');
  Ember.run(view, 'appendTo', '#qunit-fixture');
  equal(view.$().text().trim(), "hello Tom");
  Ember.run(function () { intl.set('locale', 'es-es'); });
  equal(view.$().text().trim(), "hola Tom");
  Ember.run(view, 'destroy');
});

Running

• ember server
• Visit your app at http://localhost:4200.

Running Tests

• ember test
• ember test --server