# Description **redux-i18n** is a simple yet powerful package to translate your _react_ applications using _react-redux_. [![npm version](https://badge.fury.io/js/redux-i18n.svg)](https://www.npmjs.com/package/redux-i18n) ![downloads](https://img.shields.io/npm/dm/redux-i18n.svg) ## Installation ``` npm i redux-i18n --save ``` or ``` yarn add redux-i18n ``` ## Features - Translate literals. - Pluralize literals. - Designed for react-redux. - Compatible with Immutable.js. - Export translations to POT files (make your translations with [Poedit](https://poedit.net/)). - Import translations from .PO files to _translations.js_ object (for use in your project). - Add comments for translators. ## Requirements - node >= 4.0.0 ## Overview **redux-i18n** offers your app the `t()` function to translate literals. The `t()` function is available in the components of your app via React [context](https://reactjs.org/docs/context.html). To achieve this you need to wrap your app into the `` component from **redux-i18n** that provides for the context. Furthermore, for all components that want to use the `t()` function you need to define `contextTypes`, e.g.: ```javascript // import ... import PropTypes from 'prop-types' class MyComponent extends React.Component { render() { return

{this.context.t('Hello World!')}

} } MyComponent.contextTypes = { t: PropTypes.func } ``` If `contextTypes` is not defined, then context will be an empty object. The `t()` function takes up to three arguments `t(textKey [, params, comments])`, where `textKey` is either the string to be translated or --- for pluralization --- an object as defined below. For setting the language in the redux store **redux-i18n** offers an action creator `setLanguage`. To manage the translations in your React app, **redux-i18n** supports two choices: 1. load all your translations into a one big JS object 1. load your translations into a slice of your redux store For the latter **redux-i18n** provides an action function creator `setTranslations`. As `setTranslations` is an action function creator you need to add _redux-thunk_ to your middleware for it to work. **redux-i18n** supports your store in plain JavaScript structures, but also if it is managed by help of _immutable.js_. Finally, **redux-i18n** offers scripts to generate a translations object from po files that can be managed in [Poedit](https://poedit.net/). ## Usage The package provides a parent component to encapsulate your application as well as helpers functions to translate your project. ```javascript // import ... import I18n from 'redux-i18n' // with Immutable.js: import I18n from 'redux-i18n/immutable' import { translations } from './translations' class Root extends React.Component { render() { return ( ) } } ``` Where `translations` is a dictionary similar to this: ```javascript export const translations = { es: { 'Translate this text': 'Traduce este texto', 'Hello {n}!': 'Hola {n}!' } } ``` You can also set the initial language with the _initialLang_ prop: ```javascript

My Project

{this.props.children}

``` If you have partial translations, this means that you don't have your translations at 100% and you want to show untranslated literals in an other language, you can use the `fallbackLang` prop. ```javascript

My Project

{this.props.children}

``` In this case, if you want to show this translations: ```html

{this.context.t('_hello_')}

``` And this isn't in "de" language, it will show in "en". ## Redux Reducer The language state is managed in a slice of the store named `i18nState`. Therefore, you have to add the **i18nState** reducer in your `combineReducers`. ```javascript import { otherreducers } from './Yourproject' import { i18nState } from 'redux-i18n' // with Immutable.js: import { i18nState } from 'redux-i18n/immutable' const appReducer = combineReducers({ otherreducers, i18nState }) ``` The current language is contained in the `lang` key of `i18nState`. The `i18nState` is initially defined as ```javascript const defaultI18nState = { lang: 'en', translations: {}, forceRefresh: false } // immutablejs const defaultI18nState = new Map({ lang: 'en', translations: {}, forceRefresh: false }) ``` When you [map your state to props with connect](https://github.com/reactjs/react-redux/blob/master/docs/api.md#connectmapstatetoprops-mapdispatchtoprops-mergeprops-options) you can also access the `lang` attribute in your components: ```javascript export default connect(state => ({ lang: state.i18nState.lang, }))(Home) // with Immutable.js: export default connect(state => ({ lang: state.getIn(['i18nState', 'lang']), }))(Home) ``` ## Translate literals You can access the functions of `` using your component's context. For example: ```javascript Home.contextTypes = { t: PropTypes.func.isRequired } ``` ...you will then be able to use the `t()` method in your component. ```javascript render() { return (

Your current language, is: {this.props.lang}
{this.context.t("Translate this text")}
{this.context.t("Hello {n}!", {n: "World"})}

) } ``` You can also use the `t()` function to change date formats ```javascript export const translations = { de: { 'YYYY-MM-DD': 'DD.MM.YYYY' } } ``` ```javascript render() { let today = moment() return (

{today.format(this.context.t("YYYY-MM-DD"))}

) } ``` Add comments for translators. ```javascript render() { return (

{this.context.t("Translate this text", {}, "This is a comment for translators.")} {this.context.t("Hello {n}!", {n: "Cesc"}, "This is another comment.")}

) } ``` Here's how _Poedit_ will show the comments: ![Poedit screenshot](imgs/poedit1.jpg?raw=true 'Poedit screenshot') ### HTML Object as parameter ```javascript const user = { name: 'World' } const name = {user.name} return

``` Result: ```html Hello Cesc ``` Notice that for [security reasons](https://facebook.github.io/react/docs/dom-elements.html#dangerouslysetinnerhtml) we can't print html code directly, which is why we need to use the "dangerouslySetInnerHTML" method for that. ## Stateless components Example: ```javascript const Foo = ({}, context) =>

{context.t('Hello World')}

``` ## Pluralize To use plurals in your translations. ```javascript

{this.context.t(['una noche', '{n} noches', 'n'], { n: 1 })}

``` Pass an array instead of a string as first parameter. The first element is a singular term, the second is the plural form and the last one is an object used to set the quantity. After extracting the translations to a POT file and opening it with Poedit you will see the following: ![Poedit screenshot](imgs/poedit2.jpg?raw=true 'Poedit screenshot') Also the `translations` object allows to set an options node. There you can set a plurals form rule and a plurals number. Also, you can suppress warnings logged in console. For example: ```javascript export const translations = { es: { 'Translate this text': 'Traduce este texto', 'Hello {n}!': 'Hola {n}!' }, options: { plural_rule: 'n > 1', plural_number: '2', suppress_warnings: true // defaults to false } } ``` When the translations are generated from po import file, this node is created automatically. _Note_: Versions >=1.5.10 allow to use all existing pluralization rules: [http://docs.translatehouse.org/projects/localization-guide/en/latest/l10n/pluralforms.html](http://docs.translatehouse.org/projects/localization-guide/en/latest/l10n/pluralforms.html) ## Change language Use the _setLanguage_ action. ```javascript import {setLanguage} from "redux-i18n" componentWillMount() { this.props.dispatch(setLanguage("es")) } ``` If you work with combined languages like `"es-ES"`, `"en-GB"`, but your translations object doesn't include those properties... ```javascript export const translations = { "es": { ... }, "en": { ... } } ``` ..._redux-i18n_ will fallback on the closest property. In this case, `"es"` or `"en"`. ## Extract/Import scripts **redux-i18n** includes a script to extract your translation strings to a _.pot_ template which you can use in _Poedit_, and another to import strings from _po_ files to a `translation.js`. Add the scripts in your _package.json_ for this purpose: ```json "scripts": { "extract": "i18n_extract", "import": "i18n_import" } ``` You can then run the following commands in your terminal: ``` npm run extract npm run import ``` ### Extract texts and build template.pot ``` npm run extract ``` By default, this script will search for all literals inside your **src** folder with a regular expression and build a **locales/template.pot** file. This file can then be used in [Poedit](https://poedit.net/) to build _en.po_, _es.po_, etc. files. If you want to set other source folder, you can use the `--source` switch. ```json "scripts": { "extract": "i18n_extract --source=mysourcefolder", "import": "i18n_import" } ``` Or if you want to export your locales to a different folder... ```json "scripts": { "extract": "i18n_extract --source=mysourcefolder --locales=mylocalesfolder", "import": "i18n_import" } ``` By default this command find in all _.js_ and _.jsx_ file extensions, but you can customize it with _fexts_ parameter. Check out this example: ```json "scripts": { "extract": "i18n_extract --fexts=js,jsx,coffee", "import": "i18n_import" } ``` The default regular expression will search all occurrences of `this.context.t` string, but you can also supply your own custom pattern, as in the following example: ```javascript export default function App({ aProp, bProp }, { t: translate }) { return

{translate('Hello world!')}

} ``` You will then need to set the `--pattern` flag in _package.json_: ```json "scripts": { "extract": "i18n_extract --pattern=translate", "import": "i18n_import" } ``` ### Import .po files When your translators are done translating your terms, you can import your _po_ files running the import script: ``` npm run import ``` This script read all _po_ files inside your _locales_ folder, extract all translations and build a **src/translations.js** that you can then use in your project. Your _.po_ files must define header language, check [mininal format](https://gist.github.com/Salec/3ddcf037e9cc4c44082441f379bf0165) for more information. You can also set another _locales_ folder: ```json "scripts": { "extract": "i18n_extract --source=mysource --locales=mylocales", "import": "i18n_import --locales=mylocales" } ``` Or, save _translation.js_ to a different location: ```json "scripts": { "extract": "i18n_extract --source=mysource --locales=mylocales", "import": "i18n_import --locales=mylocales --translations=myfolder" } ``` You can also change the encoding for your extraction from PO (default is iso-8859-1) ```json "scripts": { "extract": "i18n_extract --source=mysource --locales=mylocales", "import": "i18n_import --encoding=utf-8" } ``` ## Async translations When applications grow, translations tend to bigger as well, adding a lot to the overall size of the js bundle. You can set an empty translations object to the `` component and set the `useReducer` prop to true to use the store as the source of strings. For example: ```javascript ``` Then you can use the `setTranslations` action. ```javascript import { setTranslations } from 'redux-i18n' api.get('...').then((r) => this.props.dispatch(setTranslations(r.translations))) ``` You can pass a second parameter to the action to set the language. Depending on your response's structure, it could look like this: ```javascript api.get('...').then((r) => this.props.dispatch(setTranslations(r.translations, 'en'))) ``` Since version 1.5.1 is possible pass a dictionary as a second param with some options. This allows us set more functionalities to method. - preserveExisting (bool): If is true, the translations received does merge with existing translations. - language (string): Language code Some examples: ```javascript setTranslations(newTranslations, { preserveExisting: true }) setTranslations({ Hello: 'Hallo' }, { language: 'de' }) ``` ## InitialState Sometimes language is set initially by the redux store creation, or in an isomorphic way. In this case, you can set the `initialized` prop to stop the `I18n` provider from dispatching an action. ## HOC If you want to isolate the use of context from your components, you can import the Localize Hoc to provide the translate function as a prop to your component. For example: ```javascript import { localize } from 'redux-i18n' class SomeComponent extends Component { render() { return this.props.t('hello world') } } export default localize()(SomeComponent) ``` You can also change the name of the provided prop: ```javascript import { localize } from 'redux-i18n' class SomeComponent extends Component { render() { return this.props.translate('hello world') } } export default localize('translate')(SomeComponent) ``` --- **Please**, if you like my package, don't forget to rate it. Click on the "star"!

	Stars	Issues	Version	Updated	Created
react-intl			6.6.6	11 days ago	10 years ago
react-native-localization	896	71	2.3.2	10 months ago	9 years ago
react-redux-i18n			1.9.3	6 years ago	8 years ago
redux-i18n	232	33	1.5.26	a year ago	8 years ago

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