React Native Globalize

Simple globalization library for React Native. Provides access to all formatting options as well as easy-to-use React Native components.

How does it work?

Because it's based on the jQuery Globalize project, React Native Globalize can format and parse numbers, format and parse dates, format currency, and format messages (using the ICU message pattern) using the correct plural rules for the language/locale. Take a look at https://github.com/jquery/globalize for more information.

The important thing to note is all this functionality depends entirely on CLDR data. While a huge number of languages/locales and currencies are available in this data, only some are loaded by default. This is done for performance reasons as loading hundreds of megabytes of CLDR data would massively inflate app bundle sizes and startup times. The default languages and currencies are listed below, and you can always pass additional CLDR data directly if you need additional language/locale or currency support. Using the default configuration should only increase your bundle size by about 1MB and negligibly affect startup time, but if you want more control, customize!

Want to customize the included locales and/or currencies? Just fork the repo, edit the two arrays in gulpfile.js to suit your needs, run gulp cldr, and you've got your own custom version with only what you need.

Default Locales & Currencies

const locales = [
  'am',           // Amharic
  'ar',           // Arabic
  'bg',           // Bulgarian
  'bn',           // Bengali
  'ca',           // Catalan
  'cs',           // Czech
  'da',           // Danish
  'de',           // German
  'el',           // Greek
  'en',           // English (United States)
  'en-GB',        // English (Great Britain)
  'es',           // Spanish
  'es-419',       // Spanish (Latin America & Caribbean)
  'et',           // Estonian
  'fa',           // Persian
  'fi',           // Finnish
  'fil',          // Filipino
  'fr',           // French
  'gu',           // Gujarati
  'he',           // Hebrew
  'hi',           // Hindi
  'hr',           // Croatian
  'hu',           // Hungarian
  'id',           // Indonesian
  'it',           // Italian
  'ja',           // Japanese
  'kn',           // Kannada
  'ko',           // Korean
  'lt',           // Lithuanian
  'lv',           // Latvian
  'ml',           // Malayalam
  'mr',           // Marathi
  'ms',           // Malay
  'nb',           // Norwegian
  'nl',           // Dutch
  'pl',           // Polish
  'pt',           // Portuguese
  'pt-PT',        // Portuguese (Portugal)
  'ro',           // Romanian
  'ru',           // Russian
  'sk',           // Slovak
  'sl',           // Slovenian
  'sr',           // Serbian
  'sv',           // Swedish
  'sw',           // Swahili
  'ta',           // Tamil
  'te',           // Telugu
  'th',           // Thai
  'tr',           // Turkish
  'uk',           // Ukrainian
  'vi',           // Vietnamese
  'zh',           // Chinese
  'zh-Hans',      // Chinese (Simplified)
  'zh-Hant',      // Chinese (Traditional)
];

const currencies = [
  'CAD',          // Canadian Dollar
  'EUR',          // Euro
  'GBP',          // British Pound
  'USD',          // US Dollar
];

Usage

Use FormattedWrapper at the root of your application to propagate the required context to all components. Alternatively, include getChildContext() in your own component (see FormattedWrapper for an example). Then use any of the included components or access the formatting functions directly from the React Context (see below) anywhere in your application.

FormattedWrapper

Props

Prop	Type	Default	Description
locale	String	en	The language/locale to be used for formatting.
currency	String	USD	The default currency code to be used for currency formatting.
messages	Object		ICU-formatted messages for use with FormattedMessage and getMessageFormatter.
cldr	Array		Additional CLDR data to load (e.g. cldr={[require('path/to/file.json'), require('path/to/anotherFile.json')]}).
localeFallback	Boolean	false	Automatically attempt to find a fallback when CLDR data for the selected locale is missing (e.g. en_NZ -> en).
warnOnMissingMessage	Boolean	true	Display a warning message when a message key is missing.

import { FormattedWrapper } from 'react-native-globalize';

const Messages = {
  en: {
    hello: 'Hello',
  },
  es: {
    hello: 'Hola',
  },
};

class MyApp extends Component {
  render() {
    return (
      <FormattedWrapper locale="en" currency="USD" messages={Messages}>
        <App />
      </FormattedWrapper>
    )
  }
}

FormattedCurrency

Props

Prop	Type	Default	Description
value	Number		Required. The number you want to format.
currency	String		Defaults to currency set on FormattedWrapper.
style	TextStyle		Styles to apply to resulting Text node.
minimumFractionDigits	Int		Non-negative integer indicating the minimum fraction digits to be shown. Numbers will be rounded or padded with trailing zeroes as necessary. This overrides the default minimum fraction digits derived from CLDR.
maximumFractionDigits	Int		Non-negative integer indicating the maximum fraction digits to be shown. Numbers will be rounded or padded with trailing zeroes as necessary. This overrides the default maximum fraction digits derived from CLDR.
numberStyle	String	symbol	Formatting style to use when displaying currency. Values: symbol ($1.00), accounting, code (1.00 USD), or name (1.00 US dollar).
round	String	round	Rounding method: ceil, floor, round, or truncate.
useGrouping	Boolean	true	Whether a grouping separator should be used. This overrides the language default derived from CLDR.

import { FormattedCurrency } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedCurrency
        value={9.99}
        currency="USD"
        style={{ color: 'red' }} />
    );
  }
}
// $9.99

FormattedDate

Props

Prop	Type	Default	Description
value	Date		Required. The date object you want to format.
style	TextStyle		Styles to apply to resulting Text node.
skeleton	String		Date format skeleton. See the CLDR documentation. Not all options work
date	String		One of: full, long, medium, short. Outputs just a date (e.g. Monday, November 1, 2010).
time	String		One of: full, long, medium, short. Outputs just a time (e.g. 5:55:00 PM GMT-02:00).
datetime	String		One of: full, long, medium, short. Outputs a datetime (e.g. Monday, November 1, 2010 at 5:55:00 PM GMT-02:00).

Only ONE of skeleton, date, time, and datetime should be specified.

import { FormattedDate } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedDate
        value={new Date()}
        style={{ color: 'red' }}
        skeleton="yMd" />
    );
  }
}
// 12/31/2015

FormattedMessage

Format a message based on the ICU message format pattern and variables.

Props

Prop	Type	Default	Description
message	Array/String		Required. The key of the message you want to format. Can be passed as a string (e.g. test/hello) or an array (e.g. ['test', 'hello']).
values	Object	{}	Variables for replacement/formatting.
defaultMessage	String		A string to display if the message key does not exist. Otherwise, the message key itself will be displayed.
style	TextStyle		Styles to apply to resulting Text node.

• Values/variables can also be passed as props. Any additional props other than the 4 above will be merged with the values object. Note: Specific props will override the values object if both are given and keys collide.
• Values can also be components. See the last example below.
• See ICU message formatting guidelines for more info.

// Messages added via FormattedWrapper
const Messages = {
  en: {
    hello: 'Hey {first} {middle} {last},',
    test: {
      select: '{gender, select, female {{host} invites {guest} to her party} male {{host} invites {guest} to his party} other {{host} invites {guest} to their party}}',
      plural: 'You have {count, plural, one {one task} other {{count} tasks}} remaining',
      component: 'Hey {name}, you asked me to remind you about {item} at {time}!',
    },
  },
};

// Example 1
import { FormattedMessage } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedMessage
        message="hello"
        first="John"
        middle="William"
        last="Smith"
        style={{ color: 'red' }} />
    );
  }
}
// Hey John William Smith,

// Example 2
import { FormattedMessage } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedMessage
        message="test/select"
        values={{ gender: 'male', host: 'Josh', guest: 'Andrea' }}
        style={{ color: 'red' }} />
    );
  }
}
// Josh invites Andrea to his party

// Example 3
import { FormattedMessage } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedMessage
        message={['test', 'select']}
        gender="female"
        host="Jennifer"
        guest="Michael"
        style={{ color: 'red' }} />
    );
  }
}
// Jennifer invites Michael to her party

// Example 4
import { FormattedMessage } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedMessage
        message="test/plural"
        values={{ count: 4 }}
        style={{ color: 'red' }} />
    );
  }
}
// You have 4 tasks remaining

// Example 5
import { FormattedMessage } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedMessage
        message="test/component"
        name="Josh"
        item="buying groceries"
        time={<FormattedDate value={new Date()} time="short" />} />
    );
  }
}
// Hey Josh, you asked me to remind you about buying groceries at 4:00 PM

FormattedNumber

Props

Prop	Type	Default	Description
value	Number		Required. The number you want to format.
style	TextStyle		Styles to apply to resulting Text node.
minimumFractionDigits	Int		Non-negative integer indicating the minimum fraction digits to be shown. Numbers will be rounded or padded with trailing zeroes as necessary. This overrides the default minimum fraction digits derived from CLDR.
maximumFractionDigits	Int		Non-negative integer indicating the maximum fraction digits to be shown. Numbers will be rounded or padded with trailing zeroes as necessary. This overrides the default maximum fraction digits derived from CLDR.
numberStyle	String	decimal	Formatting style to use for displaying number. Values: decimal (0.5), percent (50%).
round	String	round	Rounding method: ceil, floor, round, or truncate.
useGrouping	Boolean	true	Whether a grouping separator should be used. This overrides the language default derived from CLDR.

import { FormattedNumber } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedNumber
        value={1.5}
        minimumFractionDigits={2}
        style={{ color: 'red' }} />
    )
  }
}
// 1.50

// Arabic (ar) selected
import { FormattedNumber } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedNumber
        value={3.141592}
        style={{ color: 'red' }} />
    )
  }
}
// ٣٫١٤٢

FormattedPlural

Props

Prop	Type	Default	Description
value	Number		Required. The value you want to base plural selection on.
style	TextStyle		Styles to apply to resulting Text node.
other	Node		Node to output when plural type is other or when node for type is not specified.
zero	Node		Node to output when plural type is zero.
one	Node		Node to output when plural type is one.
two	Node		Node to output when plural type is two.
few	Node		Node to output when plural type is few.
many	Node		Node to output when plural type is many.

import { FormattedPlural } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedPlural
        value={0}
        zero={<Text>:(</Text>}
        other={<Text>:)</Text>} />
    );
  }
}
// :(

FormattedRelativeTime

Props

Prop	Type	Default	Description
value	Date		Required. The date you want to use to compute the difference from.
unit	String		Required. One of: best, second, minute, hour, day, week, month, year.
style	TextStyle		Styles to apply to resulting Text node.
form	Mixed		One of: short, narrow, 0, false. Change output type.

import { FormattedRelativeTime } from 'react-native-globalize';

class MyComponent extends Component {
  render() {
    return (
      <FormattedRelativeTime
        value={myDateObject}
        unit="best"
        style={{ color: 'red' }} />
    );
  }
}
// 2 days ago

FormattedTime

See FormattedDate. All props and functionality are identical.

Context

You can access formatting functions via the context should you need programmatic access to the results or if a component is not appropriate. For this to work, you must still have FormattedWrapper at the root of you application, or you must be providing an alternative getChildContext in a parent component.

import { PropTypes } from 'react-native-globalize';

class MyComponent extends Component {
  myFunction() {
    const dateFormatter = this.context.globalize.getDateFormatter({skeleton: 'yMd'});
    const formattedDate = dateFormatter(new Date());

    const currencyFormatter = this.context.globalize.getCurrencyFormatter('USD', { minimumFractionDigits: 0, maximumFractionDigits: 0 });
    const formattedCurrency = currencyFormatter(9.99);
  }
}

MyComponent.contextTypes = {
  globalize: PropTypes.globalizeShape,
};

Globalize

A few static methods are also available on the Globalize class. You can check whether CLDR data has been loaded for a given locale, get an array of all loaded locales, load additional CLDR data, and load additional ICU-formatted messages. Check out the examples below.

import { Globalize } from 'react-native-globalize';

// Check if a locale has CLDR data
Globalize.localeIsLoaded('en');
// true

// Get an array of all loaded locales
Globalize.availableLocales();
// [ 'am', 'ar', ... ]

// Load additional CLDR data
Globalize.load([require('path/to/cldr/file.json')]);

// Load additional messages
Globalize.loadMessages({
  en: {
    test: 'Hi Josh!',
  },
});

License

 Copyright (c) 2015-2018 Josh Swan

 Licensed under the The MIT License (MIT) (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

    https://raw.githubusercontent.com/joshswan/react-native-globalize/master/LICENSE

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.