added error handling to message sending

chatto/src/main/resources/static/js/chat.js

@@ -235,7 +235,7 @@ function populateMessages(userName, passphrase) {
                         $(chatAreaNew).append(DOMPurify.sanitize(msgContainer));
                     })
 
-
+                    scrollChatAreaAnimated(2400);
                 });
 
 
@@ -301,6 +301,7 @@ document.getElementById('chatMessageForm').addEventListener('submit', function(e
     let context = { fromUser: username, message: md.render(messageContent), time: new Date().toLocaleString() };
     let msgContainer = msgContainerSendTemplate(context);
     $(chatAreaNew).append(DOMPurify.sanitize(msgContainer));
+    scrollChatAreaAnimated(2400);
     let messageCipher = sjcl.encrypt(passphraseInput.value, messageContent, { mode: "gcm", ts: 128, adata: "", iter: iterations });
     let messageCipherJson = JSON.parse(messageCipher);
     let chatMessageDTO = {
@@ -326,7 +327,11 @@ function messageSend(chatMessageDTO) {
             headers: headers,
             body: chatMessageDTO
         })
-        .then(response => console.log(response));
+        .then(response => {
+            console.log(response);
+            return response;
+        })
+        .then(response => fetchErrorHandler(response));
 }
 
 
@@ -411,4 +416,10 @@ function fetchErrorHandler(response) {
             return true;
         });
     }
+}
+
+function scrollChatAreaAnimated(delay) {
+    $(chatAreaNew).stop().animate({
+        scrollTop: $(chatAreaNew)[0].scrollHeight
+    }, delay);
 }