@react-lang/language

This is a React library for changing the language within your application.

We offer several advantages over other existing libraries:

• Great flexibility in the code. for example using the function (setTranslations) setTranslations({ en }) you can define your language files, however, to maintain the scalability of your app, it is better to use the concept of Encapsulation
• Enviroment feature for showing or not errors in production, suppose we need to show serious errors in the development environment, but in production we do not want to show them, for example an error of some key that does not exist in our language file, for that we will use setFeatures() which in addition to enable any feature, we can define in which environment it can be enabled. See setFeatures for more info.
• Format text values included in translations files. If you need a translation with a dynamic value, for example you need to print this text Hi there my name is: Jhon, you can do this by Hi there my name is: {name} or Hi there my name is: {0}. For more info see Format Text Feature
• We use React Context, therefore this allows us to use Redux for our app without doing any refactor

See Documentation
See Incoming New features

If someone want's to contribute to develop more features, please see How to contribute

Installation

NPM

npm install @react-lang/language

Yarn

yarn install @react-lang/language

Getting Started

First we need to create the languages files, for example we create the en.json

{
  "message": "Hello world how are you?"
}

Then we need to setup this files, we recomend do that in you're index.js

import React from 'react'
import ReactDOM from 'react-dom'

import { Language, setDefault, setTranslations } from '@react-lang/language'
import en from './en.json'
import en from './es.json'

setDefault('en')
setTranslations({ en, es })

ReactDOM.render(
  <React.StrictMode>
    <Language>
      <App />
    </Language>
  </React.StrictMode>,
  document.getElementById('root')
)

Now we need to get the information of the language files, to do that we have to make some changes to my App.jsx. We use React Context for this.

import { Language } from '@react-lang/language'

function App() {
  return (
    <Language.Consumer>
      {({ get, handleSetLanguage, lang }) => <p>{get('message')}</p>}
    </Language.Consumer>
  )
}

For more info of the Consumer functions see Consumer Functions

Format Text Feature

By default this feature is enabled, if yo want to disable it you can use setFeatures. If you disable this feature and someone uses it get('message', name), this throws an error message Error: feature format text want's to be used but is disable. see setFeatures() documentation.

Suppose that we need to print this text Hi there my name is: Jhon Felix, what we need to do is write in our json something like this:

en.json

{
  "message": "Hi there my name is: {name} {surname}"
}

or

{
  "message": "Hi there my name is: {0} {1}"
}

Once we have our json assembled, we will proceed to assemble the react component or function

full-example.jsx

import { Language } from '@react-lang/language'

function ShowMessage() {
  let name = 'Jhon'
  let surname = 'Felix'

  return (
    <Language.Consumer>
      {({ get }) => <p>{get('message', { name: name, surname: surname })}</p>}
    </Language.Consumer>
  )
}

or

import { Language } from '@react-lang/language'

function ShowMessage() {
  let name = 'Jhon'
  let surname = 'Felix'

  return (
    <Language.Consumer>
      {({ get }) => <p>{get('message', name, surname)}</p>}
    </Language.Consumer>
  )
}

Encapsulation

The concept of encapsulation, that we use, is that all variables consumed for a component must be inside it and nobody can modify it. So with that concept if we want to create for example a UserInfo component we need to specify the language content values inside UserInfo. Lets create it

// dont forget the imports :)

export default class UserInfo extends Component {
  state = {}

  content = {
    en: {
      message: 'Hello world how are you?'
    },
    es: {
      message: 'Hola mundo como estas?'
    }
  }

  render() {
    return (
      <Language.Consumer>
        {({ get }) => <p>{get(this.content, 'message')}</p>}
      </Language.Consumer>
    )
  }
}

Documentation

We use React Context if you want more info read it.

Language

This is the Context class that returns a provider and consumer.

Usage of Provider

import { Language } from '@react-lang/language'

ReactDOM.render(
  <React.StrictMode>
    <Language>
      <App />
    </Language>
  </React.StrictMode>,
  document.getElementById('root')
)

If you want to override lang for a specific provider you can use the prop lang=. If lang is not passed as prop, the language setted in setDefault() will be taken

<Language lang="fr">
    <App />
</Language>
);

Usage of Consumer

import { Language } from '@react-lang/language'

function SomeComponent() {
  return (
    <Language.Consumer>
      {({ get }) => <p>{get('someKey')}</p>}
    </Language.Consumer>
  )
}

setTranslations

This function sets the content of the languages files passed inside {}

Usage

import { setTranslations } from '@react-lang/language'
import en from './en.json'

setTranslations({ en })

setFeatures

This function is optional, can enable or disable some features. It also has an enviroment function optional, that if return true, the features passed in the first variable are set. if return false these features are not set. In the example below, only when the env is 'dev' will the showErrorOnJsonKeyInvalid be set to true. For more info of Features see Features Keys

Usage

import { setFeatures } from '@react-lang/language'

setFeatures({ formatText: false })

setFeatures({ showErrorOnJsonKeyInvalid: true }, () => {
  if (env === 'dev') {
    return true
  } else {
    return false
  }
})

or

import { setFeatures } from '@react-lang/language'

setFeatures({ showErrorOnJsonKeyInvalid: true })

Consumer functions

get handleSetLanguage lang

get

This function gets the text of languages files or content.

Usage

{
  "en": {
    "user": {
      "name": "Jhon",
      "surname": "Felix"
    }
  }
}

<Language.Consumer>
  {({ get }) => (
    <p>
      {get('user.name')} {get('user.surname')}
    </p>
  )}
</Language.Consumer>

Usage with Encapsulation

<Language.Consumer>
  {({ get }) => <p>{get(this.content, 'someKey')}</p>}
</Language.Consumer>

or

<Language.Consumer>
  {({ get }) => <p>{get(this.content, 'someKey', { key: value })}</p>}
</Language.Consumer>

Usage with Format Text Feature

<Language.Consumer>
  {({ get }) => <p>{get('someKey', { key: value })}</p>}
</Language.Consumer>

or

<Language.Consumer>
  {({ get }) => <p>{get('someKey', value0, value1)}</p>}
</Language.Consumer>

or

<Language.Consumer>
  {({ get }) => <p>{get('someKey', ...values)}</p>}
</Language.Consumer>

handleSetLanguage

This function sets the language given in value

Usage

<Language.Consumer>
{({ get, handleSetLanguage }) => (
    <p>{get('someKey')}</p>
    <button onClick={handleSetLanguage('fr')}>Change language to FR</button>
)}
</Language.Consumer>

lang

This is the current lang value

Usage

<Language.Consumer>
{({ handleSetLanguage, lang }) => (
    <p>Current language is: {lang}</p>
    <button onClick={handleSetLanguage('fr')}>Change language to FR</button>
)}
</Language.Consumer>

Features Keys

• showErrorOnJsonKeyInvalid: Shows an error when making 'get(value)' the value passed isn't inside the 'en.json'
• formatText: Allows the feature Format Text. If this feature is disable and someone want to use it, throws an error.

Incoming New Features

• Cookies to remember the state of the language setted

How to contribute

If you want to contribute to this proyect, follow this steps.

1. Fork this proyect
2. Make the changes
3. Create a pull request to dev branch. (if we need to merge maybe i call you to make it together if necesary)

Contact

martuu.amengual@gmail.com
Martu16#9882

2021