i18next-http-backend VS jquery-i18next

A React.js based i18next setup with in-memory translation resources could also look very similar to the above example, so let's raise the bar a little bit and see what a setup with lazy loading translations like with i18next-http-backend looks like:

The next package will load the values depending on the language returned by the language detector.

import i18next from 'i18next' import I18NextVue from 'i18next-vue' import LanguageDetector from 'i18next-browser-languagedetector' import Backend from 'i18next-http-backend' export const i18nextPromise = i18next // i18next-http-backend // loads translations from your server // https://github.com/i18next/i18next-http-backend .use(Backend) // detect user language // learn more: https://github.com/i18next/i18next-browser-languageDetector .use(LanguageDetector) // init i18next // for all options read: https://www.i18next.com/overview/configuration-options .init({ debug: true, fallbackLng: 'en' }); export default function (app) { app.use(I18NextVue, { i18next }) return app }

// ... $(function () { // use plugins and options as needed, for options, detail see // https://www.i18next.com i18next // i18next-http-backend // loads translations from your server // https://github.com/i18next/i18next-http-backend .use(i18nextHttpBackend) // detect user language // learn more: https://github.com/i18next/i18next-browser-languageDetector .use(i18nextBrowserLanguageDetector) // init i18next // for all options read: https://www.i18next.com/overview/configuration-options .init({ debug: true, fallbackLng: 'en' }, (err, t) => { if (err) return console.error(err); // ... }); });

In addition, we need to install i18next-http-backend which allows us to fetch translations from a directory, and i18next-browser-languagedetector which allows us to detect the user's language:

import i18n from 'i18next'; import { initReactI18next } from 'react-i18next'; import LanguageDetector from 'i18next-browser-languagedetector'; import Backend from 'i18next-http-backend'; import { DateTime } from 'luxon'; i18n // i18next-http-backend // loads translations from your server // https://github.com/i18next/i18next-http-backend .use(Backend) // detect user language // learn more: https://github.com/i18next/i18next-browser-languageDetector .use(LanguageDetector) // pass the i18n instance to react-i18next. .use(initReactI18next) // init i18next // for all options read: https://www.i18next.com/overview/configuration-options .init({ debug: true, fallbackLng: 'en', interpolation: { escapeValue: false, // not needed for react as it escapes by default format: (value, format, lng) => { if (value instanceof Date) { return DateTime.fromJSDate(value).setLocale(lng).toLocaleString(DateTime[format]) } return value; } }, resources: { en: { translation: { description: { part1: 'Edit <1>src/App.js and save to reload.', part2: 'Learn React' }, counter: 'Changed language just once', counter_plural: 'Changed language already {{count}} times', footer: { date: 'Today is {{date, DATE_HUGE}}', date_morning: 'Good morning! Today is {{date, DATE_HUGE}} | Have a nice day!', date_afternoon: 'Good afternoon! It\'s {{date, DATE_HUGE}}', date_evening: 'Good evening! Today was the {{date, DATE_HUGE}}' } } }, de: { translation: { description: { part1: 'Ändere <1>src/App.js und speichere um neu zu laden.', part2: 'Lerne React' }, counter: 'Die Sprache wurde erst ein mal gewechselt', counter_plural: 'Die Sprache wurde {{count}} mal gewechselt', footer: { date: 'Heute ist {{date, DATE_HUGE}}', date_morning: 'Guten Morgen! Heute ist {{date, DATE_HUGE}} | Wünsche einen schönen Tag!', date_afternoon: 'Guten Tag! Es ist {{date, DATE_HUGE}}', date_evening: 'Guten Abend! Heute war {{date, DATE_HUGE}}' } } } } }); export default i18n;

const getGreetingTime = () => { const split_afternoon = 12; // 24hr time to split the afternoon const split_evening = 17; // 24hr time to split the evening const currentHour = moment().hour(); if (currentHour >= split_afternoon && currentHour <= split_evening) { return 'afternoon'; } else if (currentHour >= split_evening) { return 'evening'; } return 'morning'; } const rerender = () => { // start localizing, details: // https://github.com/i18next/jquery-i18next#usage-of-selector-function $('body').localize(); $('#footerMessage').localize({ context: getGreetingTime() }); $('title').text($.t('head.title')) $('meta[name=description]').attr('content', $.t('head.description')) } const locizeOptions = { projectId: '8d751621-323e-4bda-94c8-7d2368102e62', apiKey: '302aca54-2ea8-4b9f-b5f0-df1369c59427' // YOU should not expose your apps API key to production!!! }; i18next.on('editorSaved', rerender); // used for the inContext editor $(function () { const locizeBackend = new i18nextLocizeBackend(locizeOptions, (err, opts, lngs) => { if (err) return console.error(err); // use plugins and options as needed, for options, detail see // https://www.i18next.com i18next // locize-editor // InContext Editor of locize .use(locize.locizePlugin) // locize-lastused (do not use this in production) // sets a timestamp of last access on every translation segment on locize // -> safely remove the ones not being touched for weeks/months // https://github.com/locize/locize-lastused .use(locizeLastUsed) // i18next-locize-backend // loads translations from your project, saves new keys to it (saveMissing: true) // https://github.com/locize/i18next-locize-backend .use(locizeBackend) // detect user language // learn more: https://github.com/i18next/i18next-browser-languageDetector .use(i18nextBrowserLanguageDetector) // init i18next // for all options read: https://www.i18next.com/overview/configuration-options .init({ ...opts, debug: true, fallbackLng: 'en', backend: locizeOptions, locizeLastUsed: locizeOptions, saveMissing: true // interpolation: { // // legacy usage // format: (value, format, lng) => { // if (value instanceof Date) { // return moment(value).locale(lng).format(format); // } // return value; // } // } }, (err, t) => { if (err) return console.error(err); // new usage i18next.services.formatter.add('LLLL', (value, lng, options) => { return moment(value).locale(lng).format('LLLL'); }); // for options see // https://github.com/i18next/jquery-i18next#initialize-the-plugin jqueryI18next.init(i18next, $, { useOptionsAttr: true }); // fill language switcher Object.keys(lngs).map((lng) => { const opt = new Option(lngs[lng].nativeName, lng); if (lng === i18next.resolvedLanguage) { opt.setAttribute("selected", "selected"); } $('#languageSwitcher').append(opt); }); let languageChangedCounter = 0; $('#languageSwitcher').change((a, b, c) => { const chosenLng = $(this).find("option:selected").attr('value'); i18next.changeLanguage(chosenLng, () => { rerender(); // language changed message languageChangedCounter++; $('#languageChangedNotification').localize({ count: languageChangedCounter }) if (languageChangedCounter === 1) { $('#languageChangedNotification').show(); } }); }); rerender(); $('#loader').hide(); $('#content').show(); }); }); });