Polyglot i18n provider for react-admin

Polyglot i18n provider for react-admin, the frontend framework for building admin applications on top of REST/GraphQL services. It relies on polyglot.js, which uses JSON files for translations.

Installation

npm install --save ra-i18n-polyglot

Usage

Wrap the function exported by this package around a function returning translation messages based on a locale to produce a valid i18nProvider.

import * as React from "react";
import { Admin, Resource } from 'react-admin';
import polyglotI18nProvider from 'ra-i18n-polyglot';
import englishMessages from 'ra-language-english';
import frenchMessages from 'ra-language-french';

const messages = {
    fr: frenchMessages,
    en: englishMessages,
};

const i18nProvider = polyglotI18nProvider(locale => messages[locale]);

const App = () => (
    <Admin locale="en" i18nProvider={i18nProvider}>
        ...
    </Admin>
);

export default App;

Translation Messages

The message returned by the function argument should be a dictionary where the keys identify interface components, and values are the translated string. This dictionary is a simple JavaScript object looking like the following:

{
    ra: {
        action: {
            delete: 'Delete',
            show: 'Show',
            list: 'List',
            save: 'Save',
            create: 'Create',
            edit: 'Edit',
            cancel: 'Cancel',
        },
        ...
    },
}

All core translations are in the ra namespace, in order to prevent collisions with your own custom translations. The root key used at runtime is determined by the value of the locale prop.

The default messages are available here.

Asynchronous Locale Change

The function passed as parameter of polyglotI18nProvider can return a Promise for messages instead of a messages object. This lets you lazy load messages upon language change.

Note that the messages for the default locale (used by react-admin for the initial render) must be returned in a synchronous way.

import polyglotI18nProvider from 'ra-i18n-polyglot';
import englishMessages from 'ra-language-english';

const asyncMessages = {
    fr: () => import('ra-language-french').then(messages => messages.default),
    it: () => import('ra-language-italian').then(messages => messages.default),
};

const messagesResolver = locale => {
    if (locale === 'en') {
        // initial call, must return synchronously
        return englishMessages;
    }
    // change of locale after initial call returns a promise
    return asyncMessages[params.locale]();
}

const i18nProvider = polyglotI18nProvider(messagesResolver);

Using Specific Polyglot Features

Polyglot.js is a fantastic library: in addition to being small, fully maintained, and totally framework agnostic, it provides some nice features such as interpolation and pluralization, that you can use in react-admin.

const messages = {
    'hello_name': 'Hello, %{name}',
    'count_beer': 'One beer |||| %{smart_count} beers',
};

// interpolation
translate('hello_name', { name: 'John Doe' });
=> 'Hello, John Doe.'

// pluralization
translate('count_beer', { smart_count: 1 });
=> 'One beer'

translate('count_beer', { smart_count: 2 });
=> '2 beers'

// default value
translate('not_yet_translated', { _: 'Default translation' });
=> 'Default translation'

To find more detailed examples, please refer to http://airbnb.io/polyglot.js/