158 lines
4.6 KiB
Markdown
158 lines
4.6 KiB
Markdown
# Introduction
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[](https://www.npmjs.com/package/i18next-browser-languagedetector)
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[]()
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[](https://david-dm.org/i18next/i18next-browser-languagedetector)
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This is a i18next language detection plugin use to detect user language in the browser with support for:
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- cookie (set cookie i18next=LANGUAGE)
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- sessionStorage (set key i18nextLng=LANGUAGE)
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- localStorage (set key i18nextLng=LANGUAGE)
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- navigator (set browser language)
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- querystring (append `?lng=LANGUAGE` to URL)
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- htmlTag (add html language tag <html lang="LANGUAGE" ...)
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- path (http://my.site.com/LANGUAGE/...)
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- subdomain (http://LANGUAGE.site.com/...)
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# Getting started
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Source can be loaded via [npm](https://www.npmjs.com/package/i18next-browser-languagedetector), bower or [downloaded](https://github.com/i18next/i18next-browser-languagedetector/blob/master/i18nextBrowserLanguageDetector.min.js) from this repo.
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```
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# npm package
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$ npm install i18next-browser-languagedetector
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# bower
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$ bower install i18next-browser-languagedetector
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```
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- If you don't use a module loader it will be added to `window.i18nextBrowserLanguageDetector`
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Wiring up:
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```js
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import i18next from 'i18next';
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import LanguageDetector from 'i18next-browser-languagedetector';
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i18next.use(LanguageDetector).init(i18nextOptions);
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```
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As with all modules you can either pass the constructor function (class) to the i18next.use or a concrete instance.
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## Detector Options
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```js
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{
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// order and from where user language should be detected
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order: ['querystring', 'cookie', 'localStorage', 'sessionStorage', 'navigator', 'htmlTag', 'path', 'subdomain'],
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// keys or params to lookup language from
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lookupQuerystring: 'lng',
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lookupCookie: 'i18next',
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lookupLocalStorage: 'i18nextLng',
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lookupSessionStorage: 'i18nextLng',
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lookupFromPathIndex: 0,
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lookupFromSubdomainIndex: 0,
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// cache user language on
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caches: ['localStorage', 'cookie'],
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excludeCacheFor: ['cimode'], // languages to not persist (cookie, localStorage)
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// optional expire and domain for set cookie
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cookieMinutes: 10,
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cookieDomain: 'myDomain',
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// optional htmlTag with lang attribute, the default is:
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htmlTag: document.documentElement,
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// optional set cookie options, reference:[MDN Set-Cookie docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie)
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cookieOptions: { path: '/', sameSite: 'strict' }
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}
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```
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Options can be passed in:
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**preferred** - by setting options.detection in i18next.init:
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```js
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import i18next from 'i18next';
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import LanguageDetector from 'i18next-browser-languagedetector';
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i18next.use(LanguageDetector).init({
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detection: options,
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});
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```
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on construction:
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```js
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import LanguageDetector from 'i18next-browser-languagedetector';
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const languageDetector = new LanguageDetector(null, options);
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```
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via calling init:
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```js
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import LanguageDetector from 'i18next-browser-languagedetector';
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const languageDetector = new LanguageDetector();
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languageDetector.init(options);
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```
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## Adding own detection functionality
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### interface
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```js
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export default {
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name: 'myDetectorsName',
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lookup(options) {
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// options -> are passed in options
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return 'en';
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},
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cacheUserLanguage(lng, options) {
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// options -> are passed in options
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// lng -> current language, will be called after init and on changeLanguage
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// store it
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},
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};
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```
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### adding it
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```js
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import LanguageDetector from 'i18next-browser-languagedetector';
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const languageDetector = new LanguageDetector();
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languageDetector.addDetector(myDetector);
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i18next.use(languageDetector).init({
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detection: options,
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});
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```
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Don't forget: You have to add the name of your detector (`myDetectorsName` in this case) to the `order` array in your `options` object. Without that, your detector won't be used. See the [Detector Options section for more](#detector-options).
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---
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<h3 align="center">Gold Sponsors</h3>
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<p align="center">
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<a href="https://locize.com/" target="_blank">
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<img src="https://raw.githubusercontent.com/i18next/i18next/master/assets/locize_sponsor_240.gif" width="240px">
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</a>
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</p>
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---
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**localization as a service - locize.com**
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Needing a translation management? Want to edit your translations with an InContext Editor? Use the orginal provided to you by the maintainers of i18next!
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With using [locize](http://locize.com/?utm_source=react_i18next_readme&utm_medium=github) you directly support the future of i18next and react-i18next.
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---
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