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.

demo of ember-intl

Ember-Intl 2.0

This README targets the 2.0 API which differs from previous and the current stable versions. If you are looking for 1.x documentation, please go 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

Installation

• ember install ember-intl@beta
• Polyfill the Intl.js API (required for Safari/PhantomJS, and legacy browser)
  • Instructions on loading from assets directory
  • Instructions on conditionally loading the polyfill based on User-Agent
  • Instructions on disabling polyfill

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}'

If you wish, you can organize your translations into subdirectories such as /translations/login-page/en-us.yaml and translations/purchase-page/en-us.yaml.

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 `addTranslation`/`addTranslations`
      // method with the results of the XHR request
      this.get('intl').setLocale('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 */);
  })
});

Live Relative Timestamp

A new feature, only available when using >= Ember 1.13, is the ability to recompute the relative timestamp on an interval by passing an interval argument (in milliseconds).

{{format-relative now interval=1000}} -> now, 1 second ago, 2 seconds ago, etc. (will recompute every 1s)

Format Relative Options

List of supported format date options

Format Message

Formats ICU Message strings with the given values supplied as the hash arguments. A short-hand form of the {{format-message}} is {{t}}.

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

{{t 'product.info'
  product='Apple watch'
  price=200
  deadline=yesterday}}

{{t 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() {
    return this.get('intl').formatMessage('Hello {name}', { name: 'Jason' });
  })
});

Passing a string literal to Format Message

This is done by using the {{l}} (lowercase L) helper as a subexpression. This is useful for computed properties where you are programmatically constructing a translation string.

{{t (l '{name} took {numPhotos, plural,\n  =0 {no photos}\n  =1 {one photo}\n  other {# photos}\n} on {takenDate, date, long}')
    name='Jason'
    numPhotos=num
    takenDate=yesterday}}

Format HTML Message

This delegates to the {{t}} 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 'product.html.info'
  product='Apple watch'
  price=200
  deadline=yesterday}}

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

Named Formats

Specifying format options (e.g.: style="currency" currency="USD") in every use of format helper can become a problem in large code bases, and isn't DRY. Instead, you can provide named formats through the use of exporting a POJO from app/formats. All helpers accept a format property which accepts a key that maps to the format option under its respected type (time, date, number, relative).

For example:

// app/formats.js
export default {
  date: {
    hhmmss: {
      hour:   'numeric',
      minute: 'numeric',
      second: 'numeric'
    }
  }
};

{{format-date 'Thu Jan 23 2014 13:00:44' format='hhmmss'}}

this.get('intl').formatDate('Thu Jan 23 2014 13:00:44', {
  format: 'hhmmss'
})

Output of both the helper and the programmatic example:

1:00:44 PM

Polyfill

There are two options on how to load the Intl.js polyfill, either through the polyfill which ships with ember-intl or through polyfill.io. Both of which are documented: https://github.com/yahoo/ember-intl/wiki/Intl.js-Polyfill

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

Phantom does support the Intl API, so in order for for you ember-intl to work in a browser which does not support the Intl API, it needs to be polyfilled.

To resolve this, add the following above all script tags in tests/index.html:

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

Testing with ember-intl

• Unit testing
• Integration testing

Common Errors

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.

Running

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

Running Tests

• ember test
• ember test --server