Fix fallback language selection logic in Si18n class

Before, when the `lang` option wasn't provided, and there was no URL parameter, and the user hadn't yet selected (saved) a language, everything crashed.
jdbruxelles · Jan 11, 2024 · 1a21467 · 1a21467
1 parent 30c8240
commit 1a21467
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/si18n.js b/src/si18n.js
@@ -123,8 +123,10 @@ export default class Si18n {
     } else if (_options.lang) {
       this.#options.lang = _options.lang;
     } else {
-      // Use the default language of the navigator.
-      this.#options.lang = navigator.language.substring(0, 2);
+      // Use the default language of the navigator, if it's available.
+      const browserLang = navigator.language.substring(0, 2);
+      this.#options.lang = this.#options.availableLocales.includes(browserLang) ?
+        browserLang : this.#options.fallbackLang;
     }
 
     if (!Si18n.#isUndefined(_options.reloadPage)) {