How to use the changeLanguage function from i18next

i18next.changeLanguage is a JavaScript function that changes the current language of the i18next internationalization library.

How does i18next.changeLanguage work?

i18next.changeLanguage works by taking a string representing the new language code as input and changing the current language of the i18next library to the specified language. The function updates the internal state of the i18next library, such as the language code and the translations, to match the new language. This allows developers to dynamically change the language of the application without having to reload the page or restart the application. By providing a convenient and reliable way to change the language of the i18next library, i18next.changeLanguage can help to simplify and streamline the internationalization process in multilingual applications.

Ai Example

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const i18next = require("i18next");

// Define some translations for the 'en' (English) language
const enTranslations = {
  greeting: "Hello, world!",
  farewell: "Goodbye, world!",
};

// Define some translations for the 'es' (Spanish) language
const esTranslations = {
  greeting: "¡Hola, mundo!",
  farewell: "¡Adiós, mundo!",
};

// Initialize an i18next instance with the 'en' translations
i18next.init({
  lng: "en",
  resources: {
    en: {
      translation: enTranslations,
    },
  },
});

// Change the current language of the i18next instance to 'es'
i18next.changeLanguage("es", (error, t) => {
  if (error) {
    console.error(error);
    return;
  }

  // Output some translations in the new language to the console
  console.log(t("greeting")); // Output: ¡Hola, mundo!
  console.log(t("farewell")); // Output: ¡Adiós, mundo!
});

In this example, we use i18next.changeLanguage() to change the current language of an i18next instance from English to Spanish. We first initialize the i18next instance with some translations for the English language using i18next.init(). We then call i18next.changeLanguage() with the string 'es' to change the current language to Spanish. The function takes a callback that can be used to access the translation functions for the new language. We output some translations in the new language to the console using the t() function from the callback. By using i18next.changeLanguage, we can change the language of an i18next instance dynamically and access the appropriate translations for the new language.