i18next-browser-languagedetector
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language detector used in browser environment for i18next
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# Introduction
[](https://www.npmjs.com/package/i18next-browser-languagedetector)
This is an i18next language detection plugin used to detect user language in the browser, with support for:
- cookie (set cookie i18next=LANGUAGE)
- sessionStorage (set key i18nextLng=LANGUAGE)
- localStorage (set key i18nextLng=LANGUAGE)
- navigator (set browser language)
- querystring (append `?lng=LANGUAGE` to URL)
- htmlTag (add html language tag <html lang="LANGUAGE" ...)
- path (http://my.site.com/LANGUAGE/...)
- subdomain (http://LANGUAGE.site.com/...)
- hash (append `#lng=LANGUAGE` or `#/LANGUAGE` to URL)
# Getting started
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.
```
# npm package
$ npm install i18next-browser-languagedetector
# bower
$ bower install i18next-browser-languagedetector
```
- If you don't use a module loader it will be added to `window.i18nextBrowserLanguageDetector`
Wiring up:
```js
import i18next from 'i18next';
import LanguageDetector from 'i18next-browser-languagedetector';
i18next.use(LanguageDetector).init({
supportedLngs: ['de', 'en', 'fr'],
...i18nextOptions
});
```
As with all modules you can either pass the constructor function (class) to the `i18next.use` or to a concrete instance.
[`supportedLngs`](https://www.i18next.com/overview/configuration-options#languages-namespaces-resources) is optional, but allows i18next to pick the best match from the list of detected languages. If it's not set then [`language`](https://www.i18next.com/overview/api#language) will be set to the first detected language, regardless of whether your application has translations for that language or not.
## Detector Options
*The default options can be found [here](https://github.com/i18next/i18next-browser-languageDetector/blob/9efebe6ca0271c3797bc09b84babf1ba2d9b4dbb/src/index.js#L11).*
```js
{
// order and from where user language should be detected
order: ['querystring', 'hash', 'cookie', 'localStorage', 'sessionStorage', 'navigator', 'htmlTag', 'path', 'subdomain'],
// keys or params to lookup language from
lookupQuerystring: 'lng',
lookupCookie: 'i18next',
lookupLocalStorage: 'i18nextLng',
lookupSessionStorage: 'i18nextLng',
lookupFromPathIndex: 0,
lookupFromSubdomainIndex: 0,
lookupHash: 'lng', // #lng=pt or #something&lng=en
lookupFromHashIndex: 0, // #/de
// cache user language on
caches: ['localStorage', 'cookie'],
excludeCacheFor: ['cimode'], // languages to not persist (cookie, localStorage)
// optional expiry and domain for set cookie
cookieMinutes: 10,
cookieDomain: 'myDomain',
// optional htmlTag with lang attribute, the default is:
htmlTag: document.documentElement,
// optional set cookie options, reference:[MDN Set-Cookie docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie)
cookieOptions: { path: '/', sameSite: 'strict' },
// optional conversion function used to modify the detected language code
convertDetectedLanguage: 'Iso15897',
convertDetectedLanguage: (lng) => lng.replace('-', '_')
}
```
Options can be passed in:
**preferred** - by setting options.detection in i18next.init:
```js
import i18next from 'i18next';
import LanguageDetector from 'i18next-browser-languagedetector';
i18next.use(LanguageDetector).init({
detection: options,
});
```
on construction:
```js
import LanguageDetector from 'i18next-browser-languagedetector';
const languageDetector = new LanguageDetector(null, options);
```
via calling init:
```js
import LanguageDetector from 'i18next-browser-languagedetector';
const languageDetector = new LanguageDetector();
languageDetector.init(options);
```
## Adding own detection functionality
### interface
```js
export default {
name: 'myDetectorsName',
lookup(options) {
// options -> are passed in options
return 'en';
},
cacheUserLanguage(lng, options) {
// options -> are passed in options
// lng -> current language, will be called after init and on changeLanguage
// store it
},
};
```
### adding it
```js
import LanguageDetector from 'i18next-browser-languagedetector';
const languageDetector = new LanguageDetector();
languageDetector.addDetector(myDetector);
i18next.use(languageDetector).init({
detection: options,
});
```
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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