Integrierte Mehrsprachigkeit (Deutsch und Englisch) mit Cookie-basierter Sprachauswahl

EnvelopeGenerator.Web/wwwroot/js/network.js

@@ -159,3 +159,39 @@ class WrappedResponse {
         this.fatal = (data === null && error === null)
     }
 }
+
+async function setLangAsync(language, flagCode) {
+    document.getElementById('selectedFlag').className = 'fi ' + flagCode + ' me-2';
+
+    await fetch(`/lang/${language}`, {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json'
+        }
+    })
+}
+
+async function setLanguage(language) {
+
+    const hasLang = await fetch('/lang', {
+        method: 'GET',
+        headers: {
+            'Content-Type': 'application/json'
+        }
+    })
+    .then(res => res.json())
+    .then(langs => langs.includes(language))
+    .catch(err => false);
+
+    if(hasLang)
+        return await fetch(`/lang/${language}`, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' }
+        })
+        .then(response => {
+            if (response.redirected)
+                window.location.href = response.url;
+            else if (!response.ok)
+                return Promise.reject('Failed to set language');
+        });
+}