Merge branch 'loader' into devNachCSRF

js/comments.js

@@ -11,7 +11,19 @@ document.addEventListener("DOMContentLoaded", function () {
     const parentCommentInput = document.getElementById("parent-comment-id");
     const replyInfo = document.getElementById("reply-info");
 
-    if (!form || !commentsList || !commentContent || !parentCommentInput) {
+    const submitButton = form
+        ? form.querySelector('button[type="submit"]')
+        : null;
+
+    const loadingMessage = document.getElementById("comment-loading");
+
+    if (
+        !form
+        || !commentsList
+        || !commentContent
+        || !parentCommentInput
+        || !submitButton
+    ) {
         return;
     }
 
@@ -53,6 +65,23 @@ document.addEventListener("DOMContentLoaded", function () {
     form.addEventListener("submit", function (event) {
         event.preventDefault();
 
+        /*
+         * Verhindert einen erneuten Submit, während der vorherige
+         * Kommentar noch gespeichert wird.
+         */
+        if (submitButton.disabled) {
+            return;
+        }
+
+        const originalButtonText = submitButton.textContent;
+
+        submitButton.disabled = true;
+        submitButton.textContent = "Wird gesendet …";
+
+        if (loadingMessage) {
+            loadingMessage.hidden = false;
+        }
+
         const formData = new FormData(form);
         const parentCommentId = parentCommentInput.value;
 
@@ -293,6 +322,14 @@ document.addEventListener("DOMContentLoaded", function () {
             .catch(function (error) {
                 console.error(error);
                 alert("Kommentar konnte nicht gesendet werden.");
+            })
+            .finally(function () {
+                submitButton.disabled = false;
+                submitButton.textContent = originalButtonText;
+
+                if (loadingMessage) {
+                    loadingMessage.hidden = true;
+                }
             });
     });