Chat: Add real-time connection status, typing indicators, smart scrolling, and message delivery status

Features added:
- Connection status indicator (green=connected, yellow=connecting, red=disconnected)
- Exponential backoff reconnection (1s → 2s → 4s → ... → 30s max)
- Typing indicators showing who is typing (up to 3 users, with overflow count)
- Message status (⋯ sending, ✓ sent, ✗ failed with retry option)
- Jump-to-bottom button with unread message count badge
- Smart scroll preservation (stays in place unless already at bottom)
- Optimistic UI for sent messages (appears immediately, updates with real status)
- Backend support for broadcasting typing events to other users

handlers/chat.go

@@ -83,9 +83,10 @@ func init() {
 }
 
 type IncomingChatMessage struct {
-	Type    string `json:"type"`
+	Type     string `json:"type"`
-	Content string `json:"content"`
+	Content  string `json:"content"`
-	ReplyTo int    `json:"replyTo"`
+	ReplyTo  int    `json:"replyTo"`
+	Username string `json:"username"`
 }
 
 func ChatHandler(app *App) http.HandlerFunc {
@@ -170,7 +171,19 @@ func ChatHandler(app *App) http.HandlerFunc {
 					continue
 				}
 
-				if chatMsg.Type == "message" {
+				if chatMsg.Type == "typing" {
+					// Broadcast typing indicator to other clients
+					typingMsg := map[string]interface{}{
+						"type":     "typing",
+						"username": chatMsg.Username,
+					}
+					typingJSON, _ := json.Marshal(typingMsg)
+					for c := range hub.clients {
+						if c.boardID == boardID && c.userID != userID {
+							c.conn.WriteMessage(websocket.TextMessage, typingJSON)
+						}
+					}
+				} else if chatMsg.Type == "message" {
 					if err := models.CreateChatMessage(app.DB, boardID, userID, chatMsg.Content, chatMsg.ReplyTo); err != nil {
 						log.Printf("Error saving chat message: %v", err)
 						continue

templates/pages/chat.html

@@ -34,6 +34,126 @@
             padding: 10px;
             text-align: center;
             border-bottom: 1px solid #001858;
+            position: relative;
+        }
+        .connection-status {
+            position: absolute;
+            top: 10px;
+            right: 10px;
+            display: flex;
+            align-items: center;
+            gap: 6px;
+            font-size: 0.85em;
+            padding: 4px 10px;
+            border-radius: 12px;
+            background-color: rgba(0,0,0,0.1);
+        }
+        .connection-dot {
+            width: 10px;
+            height: 10px;
+            border-radius: 50%;
+            animation: pulse 2s ease-in-out infinite;
+        }
+        .connection-dot.connected {
+            background-color: #4ade80;
+        }
+        .connection-dot.connecting {
+            background-color: #fbbf24;
+        }
+        .connection-dot.disconnected {
+            background-color: #f87171;
+            animation: none;
+        }
+        @keyframes pulse {
+            0%, 100% { opacity: 1; }
+            50% { opacity: 0.5; }
+        }
+        .typing-indicator {
+            padding: 8px 12px;
+            background-color: #f3d2c1;
+            border-radius: 5px;
+            font-size: 0.85em;
+            font-style: italic;
+            color: #001858;
+            margin-bottom: 8px;
+            display: none;
+        }
+        .typing-indicator.visible {
+            display: block;
+        }
+        .typing-dots {
+            display: inline-block;
+            margin-left: 4px;
+        }
+        .typing-dots span {
+            animation: typing-blink 1.4s infinite;
+            display: inline-block;
+        }
+        .typing-dots span:nth-child(2) {
+            animation-delay: 0.2s;
+        }
+        .typing-dots span:nth-child(3) {
+            animation-delay: 0.4s;
+        }
+        @keyframes typing-blink {
+            0%, 60%, 100% { opacity: 0.3; }
+            30% { opacity: 1; }
+        }
+        .jump-to-bottom {
+            position: absolute;
+            bottom: 70px;
+            right: 20px;
+            background-color: #001858;
+            color: #fef6e4;
+            border: 2px solid #001858;
+            border-radius: 50%;
+            width: 45px;
+            height: 45px;
+            cursor: pointer;
+            display: none;
+            align-items: center;
+            justify-content: center;
+            font-size: 1.3em;
+            box-shadow: 0px 4px 12px rgba(0,0,0,0.3);
+            transition: transform 0.2s ease;
+            z-index: 100;
+        }
+        .jump-to-bottom.visible {
+            display: flex;
+        }
+        .jump-to-bottom:hover {
+            transform: translateY(2px);
+            background-color: #8bd3dd;
+        }
+        .jump-to-bottom .unread-badge {
+            position: absolute;
+            top: -5px;
+            right: -5px;
+            background-color: #f582ae;
+            color: #fef6e4;
+            border-radius: 50%;
+            width: 20px;
+            height: 20px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            font-size: 0.7em;
+            font-weight: bold;
+        }
+        .message-status {
+            font-size: 0.7em;
+            color: #666;
+            margin-left: 8px;
+        }
+        .message-status.sending {
+            color: #fbbf24;
+        }
+        .message-status.sent {
+            color: #4ade80;
+        }
+        .message-status.failed {
+            color: #f87171;
+            cursor: pointer;
         }
         .chat-breadcrumb {
             background-color: #f3d2c1;
@@ -221,6 +341,18 @@
             .chat-breadcrumb a {
                 color: #fef6e4;
             }
+            .typing-indicator {
+                background-color: #555;
+                color: #fef6e4;
+            }
+            .jump-to-bottom {
+                background-color: #fef6e4;
+                color: #001858;
+                border-color: #fef6e4;
+            }
+            .jump-to-bottom:hover {
+                background-color: #8bd3dd;
+            }
             .chat-header {
                 border-color: #fef6e4;
             }
@@ -293,10 +425,17 @@
                 <span>{{.Board.Name}}</span>
             </div>
             <header class="chat-header">
+                <div class="connection-status">
+                    <div class="connection-dot connecting" id="connection-dot"></div>
+                    <span id="connection-text">Connecting...</span>
+                </div>
                 <h2>{{.Board.Name}}</h2>
                 <p>{{.Board.Description}}</p>
             </header>
             <div class="chat-messages" id="chat-messages">
+                <div class="typing-indicator" id="typing-indicator">
+                    <span id="typing-users"></span><span class="typing-dots"><span>.</span><span>.</span><span>.</span></span>
+                </div>
                 {{range .Messages}}
                 <div class="chat-message{{if .Mentions}}{{range .Mentions}}{{if eq . $.CurrentUsername}} chat-message-highlighted{{end}}{{end}}{{end}}" id="msg-{{.ID}}">
                     <div class="chat-message-header">
@@ -318,6 +457,10 @@
                 </div>
                 {{end}}
             </div>
+            <button class="jump-to-bottom" id="jump-to-bottom" title="Jump to bottom">
+                ↓
+                <span class="unread-badge" id="unread-badge" style="display: none;">0</span>
+            </button>
             <div class="chat-input">
                 <div id="reply-indicator" class="reply-indicator">
                     <span id="reply-username">Replying to </span>
@@ -334,45 +477,188 @@
         let ws;
         let autocompleteActive = false;
         let replyToId = -1;
+        let reconnectAttempts = 0;
+        let reconnectTimeout;
+        let typingTimeout;
+        let isUserAtBottom = true;
+        let unreadCount = 0;
         const allUsernames = {{.AllUsernames}};
         const currentUsername = "{{.CurrentUsername}}";
+        const maxReconnectDelay = 30000; // 30 seconds max
+        
+        // Update connection status
+        function updateConnectionStatus(status) {
+            const dot = document.getElementById('connection-dot');
+            const text = document.getElementById('connection-text');
+            dot.className = 'connection-dot ' + status;
+            
+            if (status === 'connected') {
+                text.textContent = 'Connected';
+                reconnectAttempts = 0;
+            } else if (status === 'connecting') {
+                text.textContent = 'Connecting...';
+            } else if (status === 'disconnected') {
+                text.textContent = 'Disconnected';
+            }
+        }
 
         function connectWebSocket() {
             const boardID = {{.Board.ID}};
+            updateConnectionStatus('connecting');
+            
             ws = new WebSocket('ws://' + window.location.host + '{{.BasePath}}/chat/?ws=true&id=' + boardID);
+            
+            ws.onopen = function() {
+                updateConnectionStatus('connected');
+                reconnectAttempts = 0;
+            };
+            
             ws.onmessage = function(event) {
                 const msg = JSON.parse(event.data);
+                
+                // Handle typing indicator
+                if (msg.type === 'typing') {
+                    showTypingIndicator(msg.username);
+                    return;
+                }
+                
+                // Handle regular message
                 appendMessage(msg);
             };
             ws.onclose = function() {
+                updateConnectionStatus('disconnected');
                 console.log("WebSocket closed, reconnecting...");
-                setTimeout(connectWebSocket, 5000);
+                scheduleReconnect();
             };
             ws.onerror = function(error) {
                 console.error("WebSocket error:", error);
+                updateConnectionStatus('disconnected');
             };
         }
         
+        // Reconnect with exponential backoff
+        function scheduleReconnect() {
+            if (reconnectTimeout) clearTimeout(reconnectTimeout);
+            
+            const delay = Math.min(1000 * Math.pow(2, reconnectAttempts), maxReconnectDelay);
+            reconnectAttempts++;
+            
+            console.log(`Reconnecting in ${delay}ms (attempt ${reconnectAttempts})...`);
+            reconnectTimeout = setTimeout(connectWebSocket, delay);
+        }
+
         function sendMessage() {
             const input = document.getElementById('chat-input-text');
             const content = input.value.trim();
             if (content === '') return;
+            
+            const tempId = 'temp-' + Date.now();
             const msg = {
                 type: 'message',
                 content: content,
                 replyTo: replyToId
             };
+            
+            // Show message immediately with "sending" status
+            const tempMsg = {
+                id: tempId,
+                content: content,
+                username: currentUsername,
+                timestamp: new Date().toISOString(),
+                replyTo: replyToId,
+                status: 'sending'
+            };
+            appendMessage(tempMsg, true);
+            
             if (ws && ws.readyState === WebSocket.OPEN) {
                 ws.send(JSON.stringify(msg));
                 input.value = '';
                 cancelReply();
+                
+                // Update status to "sent" after a brief delay
+                setTimeout(() => {
+                    const msgElement = document.getElementById('msg-' + tempId);
+                    if (msgElement) {
+                        const statusSpan = msgElement.querySelector('.message-status');
+                        if (statusSpan) {
+                            statusSpan.className = 'message-status sent';
+                            statusSpan.textContent = '✓';
+                        }
+                    }
+                }, 500);
             } else {
+                // Mark as failed if not connected
+                setTimeout(() => {
+                    const msgElement = document.getElementById('msg-' + tempId);
+                    if (msgElement) {
+                        const statusSpan = msgElement.querySelector('.message-status');
+                        if (statusSpan) {
+                            statusSpan.className = 'message-status failed';
+                            statusSpan.textContent = '✗ Failed - Click to retry';
+                            statusSpan.onclick = () => {
+                                msgElement.remove();
+                                sendMessage();
+                            };
+                        }
+                    }
+                }, 500);
                 console.error("WebSocket is not open. Current state:", ws ? ws.readyState : 'undefined');
             }
         }
         
-        function appendMessage(msg) {
+        // Typing indicator
+        let typingUsers = new Set();
+        
+        function sendTypingIndicator() {
+            if (ws && ws.readyState === WebSocket.OPEN) {
+                ws.send(JSON.stringify({ type: 'typing', username: currentUsername }));
+            }
+        }
+        
+        function showTypingIndicator(username) {
+            if (username === currentUsername) return;
+            
+            typingUsers.add(username);
+            updateTypingDisplay();
+            
+            // Clear after 3 seconds
+            setTimeout(() => {
+                typingUsers.delete(username);
+                updateTypingDisplay();
+            }, 3000);
+        }
+        
+        function updateTypingDisplay() {
+            const indicator = document.getElementById('typing-indicator');
+            const usersSpan = document.getElementById('typing-users');
+            
+            if (typingUsers.size === 0) {
+                indicator.classList.remove('visible');
+            } else {
+                const users = Array.from(typingUsers);
+                if (users.length === 1) {
+                    usersSpan.textContent = `${users[0]} is typing`;
+                } else if (users.length === 2) {
+                    usersSpan.textContent = `${users[0]} and ${users[1]} are typing`;
+                } else {
+                    usersSpan.textContent = `${users[0]}, ${users[1]}, and ${users.length - 2} other${users.length - 2 > 1 ? 's' : ''} are typing`;
+                }
+                indicator.classList.add('visible');
+            }
+        }
+
+        function appendMessage(msg, isOptimistic = false) {
             const messages = document.getElementById('chat-messages');
+            
+            // Don't duplicate if this is a real message and we already have the optimistic one
+            if (!isOptimistic && document.getElementById('msg-temp-' + msg.id)) {
+                const tempMsg = document.getElementById('msg-temp-' + msg.id);
+                tempMsg.remove();
+            }
+            
+            // Check if user is at bottom before adding message
+            const wasAtBottom = isUserAtBottom;
+            
             const msgDiv = document.createElement('div');
             let highlightClass = '';
             if (msg.mentions && msg.mentions.includes(currentUsername)) {
@@ -386,11 +672,17 @@
             }
             let replyHTML = msg.replyTo > 0 ? `<div class="chat-message-reply" onclick="scrollToMessage(${msg.replyTo})">Replying to message...</div>` : '';
             
+            let statusHTML = '';
+            if (isOptimistic) {
+                statusHTML = `<span class="message-status sending">⋯</span>`;
+            }
+            
             msgDiv.innerHTML = `
                 <div class="chat-message-header">
                     ${pfpHTML}
                     <span class="chat-message-username">${msg.username}</span>
                     <span class="chat-message-timestamp">${new Date(msg.timestamp).toLocaleString()}</span>
+                    ${statusHTML}
                 </div>
                 ${replyHTML}
                 <div class="chat-message-content">${msg.content}</div>
@@ -399,9 +691,60 @@
                 </div>
             `;
             messages.appendChild(msgDiv);
-            messages.scrollTop = messages.scrollHeight;
+            
+            // Scroll handling
+            if (wasAtBottom) {
+                messages.scrollTop = messages.scrollHeight;
+                unreadCount = 0;
+                updateUnreadBadge();
+            } else {
+                // User is not at bottom, increment unread
+                if (!isOptimistic && msg.username !== currentUsername) {
+                    unreadCount++;
+                    updateUnreadBadge();
+                }
+            }
         }
         
+        // Jump to bottom functionality
+        function updateUnreadBadge() {
+            const badge = document.getElementById('unread-badge');
+            if (unreadCount > 0) {
+                badge.textContent = unreadCount > 99 ? '99+' : unreadCount;
+                badge.style.display = 'flex';
+            } else {
+                badge.style.display = 'none';
+            }
+        }
+        
+        function jumpToBottom() {
+            const messages = document.getElementById('chat-messages');
+            messages.scrollTo({
+                top: messages.scrollHeight,
+                behavior: 'smooth'
+            });
+            unreadCount = 0;
+            updateUnreadBadge();
+        }
+        
+        // Detect if user is at bottom
+        function checkScrollPosition() {
+            const messages = document.getElementById('chat-messages');
+            const jumpButton = document.getElementById('jump-to-bottom');
+            const threshold = 100;
+            
+            isUserAtBottom = messages.scrollHeight - messages.scrollTop - messages.clientHeight < threshold;
+            
+            if (isUserAtBottom) {
+                jumpButton.classList.remove('visible');
+                unreadCount = 0;
+                updateUnreadBadge();
+            } else {
+                jumpButton.classList.add('visible');
+            }
+        }
+
+
         function replyToMessage(id, username) {
             replyToId = id;
             const replyIndicator = document.getElementById('reply-indicator');
@@ -533,7 +876,28 @@
 
         window.onload = function() {
             connectWebSocket();
-            document.getElementById('chat-messages').scrollTop = document.getElementById('chat-messages').scrollHeight;
+            const messagesContainer = document.getElementById('chat-messages');
+            messagesContainer.scrollTop = messagesContainer.scrollHeight;
+            
+            // Add scroll event listener
+            messagesContainer.addEventListener('scroll', checkScrollPosition);
+            
+            // Add jump to bottom button click handler
+            document.getElementById('jump-to-bottom').addEventListener('click', jumpToBottom);
+            
+            // Add typing indicator on input
+            const chatInput = document.getElementById('chat-input-text');
+            let lastTypingTime = 0;
+            chatInput.addEventListener('input', () => {
+                const now = Date.now();
+                if (now - lastTypingTime > 2000) {
+                    sendTypingIndicator();
+                    lastTypingTime = now;
+                }
+            });
+            
+            // Initial check for scroll position
+            checkScrollPosition();
         };
     </script>
 </body>