45 lines
1.4 KiB
JavaScript
45 lines
1.4 KiB
JavaScript
/**
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* Get all locales supported by the client browser.
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*/
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export function getBrowserLocales() {
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let langs = [];
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if (navigator.languages) {
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// Chrome does not currently set navigator.language correctly
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// https://code.google.com/p/chromium/issues/detail?id=101138
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// but it does set the first element of navigator.languages correctly
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langs = navigator.languages;
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} else if (navigator.userLanguage) {
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// IE only
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langs = [navigator.userLanguage];
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} else {
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// as of this writing the latest version of firefox + safari set this correctly
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langs = [navigator.language];
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}
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// Some browsers does not return uppercase for second part
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const locales = langs.map((lang) => {
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const locale = lang.split('-');
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return locale[1] ? `${locale[0]}-${locale[1].toUpperCase()}` : lang;
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});
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return locales;
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}
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/**
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* Find the best matching locale from the browser preferred locales.
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*
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* @param messages A translation object with supported locales as keys.
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* @param defaultLocale An optional default locale.
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* @return The best locale to use.
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*/
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export function getBestMatchingLocale(messages, defaultLocale = 'en') {
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const locales = getBrowserLocales();
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let bestLocale = defaultLocale;
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// Get best matching locale
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locales.some(locale => (messages[locale] && (bestLocale = locale)));
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return bestLocale;
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}
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