language-observer
v0.0.1-alpha.1
Published
The LanguageObserver class provides a simple way to manage internationalization in your web application. It automates the process of applying translations and simplifies support for multiple languages.
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ux-uiReadme
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Demo
➤ Install
$ yarn add language-observer➤ Import
import LanguageObserver from 'language-observer';➤ Usage
const languageObserver = new LanguageObserver();
languageObserver.init({ lang: 'ru' });translations.js
window.translations = window.translations || {};
window.translations['ru'] = {
app: {
title: {
main: "Приложение",
settings: "Настройки",
},
menu: {
profile: "Профиль",
},
},
buttons: {
save: "Сохранить",
},
};
window.translations['en'] = {
app: {
title: {
main: "Application",
settings: "Settings",
},
menu: {
profile: "Profile",
},
},
buttons: {
save: "Save",
},
};
window.translations['es'] = {
app: {
title: {
main: "Aplicación",
settings: "Configuraciones",
},
menu: {
profile: "Perfil",
},
},
buttons: {
save: "Guardar",
},
};Switching
document.querySelector('#change-lang-to-es')?.addEventListener('click', () => {
languageObserver.loadLanguage('es');
});HTML example
<p data-i18n="title.welcome"></p>
<img data-i18n-attr='{"alt": "image.altText"}' src="image.jpg" alt="Default Alt Text">➤ Options
| Option | Type | Default | Description |
|:------:|:--------:|:-------:|:--------------------------------------------------------------------------------------------------------------------------------|
| lang | string | 'ru' | (Optional) The language code to initialize with. If not provided, the language is detected from the <body> element's class. |
➤ Methods
| Method | Parameters | Returns | Description |
|:--------------------------------------------------|:----------------------------------------------:|:---------:|:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| init(options?) | options: { lang?: string } | void | Initializes the observer. If a lang is provided in options, it loads and applies that language's translations. |
| loadLanguage(lang) | lang: string | Promise | Loads and applies translations for the specified language. If translations are not found, falls back to the default language and logs a warning. |
| applyTranslations() | none | Promise | Applies the current translations to all elements with data-i18n and data-i18n-attr attributes on the page. Useful for updating translations after dynamic content changes. |
| updateTranslations() | none | void | Manually updates translations on the page. Call this method after adding new translations to window.translations to apply them without changing the language or reloading the page. |
| loadTranslations(lang, loader) | lang: string loader: (lang) => Promise | Promise | Asynchronously loads translations for the specified language using the provided loader function, then applies them if the language matches the current language. |
| getNestedTranslation(obj, path) (static method) | obj: object path: string | any | Retrieves a nested translation value from an object using a dot-separated key path. Returns undefined if the key does not exist. |
➤ Example of using methods
Using the loadTranslations method
async function fetchTranslations(lang) {
const response = await fetch(`/locales/${lang}.json`);
return response.json();
}
languageObserver.loadTranslations('fr', fetchTranslations);Using the getNestedTranslation method
const nestedValue = LanguageObserver.getNestedTranslation(
window.translations['en'],
'app.menu.profile'
);
console.log(nestedValue);➤ License
language-observer is released under MIT license