its working

server.py

@@ -12,6 +12,7 @@
 
 import asyncio
 from fastapi import FastAPI, Request, WebSocket, WebSocketDisconnect
+from fastapi.responses import HTMLResponse
 import json
 from redis import asyncio as redis
 
@@ -24,6 +25,43 @@ templates = Jinja2Templates(directory="templates")
 # Redis connection
 redis_client = redis.Redis(host="localhost", port=6379, decode_responses=True)
 
+new_button = """
+
+            <div id='after_chat_wrapper'>
+                <div
+                    id='after_chat'
+                    class='h-12'
+                    _="
+                    on load
+                      wait 10ms
+                    on intersection(intersecting) having threshold 0.5
+                      if #go_to_bottom exists and intersecting
+                      then remove #go_to_bottom
+                      
+
+                      "
+                >
+                </div>
+            </div>
+            <div id="after_form" class='mb-24'>
+                <button
+                    id="go_to_bottom"
+                    class="fixed bottom-0 right-0 px-2 py-1 rounded font-bold m-4 invisible"
+                    hx-get="/null"
+                    hx-swap="outerHTML"
+                    hx-trigger="intersect from:#after_chat"
+                    _="
+                    on load
+                       wait 10ms
+                       remove .invisible
+                    on click
+                       go to bottom of the body
+                       "
+                    >
+                    go to bottom
+                </button>
+            </div>
+"""
 # Constants
 REDIS_MESSAGE_LIST = "chat_messages"
 WEBSOCKET_CHANNEL = "websocket_channel"
@@ -41,6 +79,7 @@ async def listen_to_redis():
     await pubsub.subscribe(WEBSOCKET_CHANNEL)
 
     async for message in pubsub.listen():
+        print(message)
         if message["type"] == "message":
             data = message["data"]
             data = json.loads(data)
@@ -52,11 +91,16 @@ async def listen_to_redis():
             color_level = color_levels[level]
             # Send message to all connected clients
             for name, websocket in connected_clients.items():
-                if data.get("name") == name:
+                html_data = ""
-                    html_data = f'<div id="chat_room" hx-swap-oob="beforeend"><li class="px-4 py-2 h-12 w-64 rounded bg-green-{color_level} ml-8 my-4">{data.get("name")}: {data.get("chat_message")}</li></div>'
+
-                else:
+                if "chat_message" in data:
-                    html_data = f'<div id="chat_room" hx-swap-oob="beforeend"><li class="px-4 py-2 h-12 w-64 rounded bg-blue-{color_level} my-4">{data.get("name")}: {data.get("chat_message")}</li></div>'
+                    if data.get("name") == name:
-                await websocket.send_text(html_data)
+                        html_data += f'<div id="chat_room" hx-swap-oob="beforeend" hx-swap="scroll:bottom"><li class="px-4 py-2 h-12 w-124 rounded bg-green-{color_level} ml-8 my-4">{data.get("name")}: {data.get("chat_message")}</li></div>'
+                    else:
+                        html_data += f'<div id="chat_room" hx-swap-oob="beforeend" hx-swap="scroll:bottom"><li class="px-4 py-2 h-12 w-124 rounded bg-blue-{color_level} my-4">{data.get("name")}: {data.get("chat_message")}</li></div>'
+                if "notification" in data:
+                    html_data += f'<div id="notifications" hx-swap-oob="beforeend"><li class="px-4 py-2 h-12 w-64 rounded bg-blue-{color_level} my-4" _="on click remove me on load wait 3s remove me" hx-trigger="click, load delay:3s" hx-swap="outerHTML">{data.get("notification")}</li></div>'
+                await websocket.send_text(html_data + new_button)
 
 
 @app.on_event("startup")
@@ -106,17 +150,30 @@ async def websocket_endpoint(websocket: WebSocket):
 
     name = random.choice(chat_names)
     connected_clients[name] = websocket
+    data = {
+        "name": name,
+        "notification": f"{name} joined the chat",
+    }
+
+    data_str = json.dumps(data)
+
+    await redis_client.publish(WEBSOCKET_CHANNEL, data_str)
 
     # Send previous messages to the new client
     messages = await redis_client.lrange(REDIS_MESSAGE_LIST, 0, -1)
     for msg in messages:
         msg_data = json.loads(msg)
         color_level = color_levels[0]  # Use first color level for old messages
-        if msg_data.get("name") == name:
+        html_data = ""
-            html_data = f'<div id="chat_room" hx-swap-oob="beforeend"><li class="px-4 py-2 h-12 w-64 rounded bg-green-{color_level} ml-8 my-4">{msg_data.get("name")}: {msg_data.get("chat_message")}</li></div>'
+        if "chat_message" in msg_data:
-        else:
+            if msg_data.get("name") == name:
-            html_data = f'<div id="chat_room" hx-swap-oob="beforeend"><li class="px-4 py-2 h-12 w-64 rounded bg-blue-{color_level} my-4">{msg_data.get("name")}: {msg_data.get("chat_message")}</li></div>'
+                html_data += f'<div id="chat_room" hx-swap-oob="beforeend"><li class="px-4 py-2 h-12 w-124 rounded bg-green-{color_level} ml-8 my-4" _="">{msg_data.get("name")}: {msg_data.get("chat_message")}</li></div>'
-        await websocket.send_text(html_data)
+
+            else:
+                html_data += f'<div id="chat_room" hx-swap-oob="beforeend"><li class="px-4 py-2 h-12 w-124 rounded bg-blue-{color_level} my-4" _="">{msg_data.get("name")}: {msg_data.get("chat_message")}</li></div>'
+        if "notification" in msg_data:
+            html_data += f'<div id="notifications" hx-swap-oob="beforeend"><li class="px-4 py-2 h-12 w-64 rounded bg-blue-{color_level} my-4">{msg_data.get("notification")}</li></div>'
+        await websocket.send_text(html_data + new_button)
 
     try:
         while True:
@@ -139,6 +196,11 @@ async def root(request: Request):
     return templates.TemplateResponse("index.html", {"request": request})
 
 
+@app.get("/null")
+async def root(request: Request):
+    return HTMLResponse("")
+
+
 if __name__ == "__main__":
     import uvicorn
 

templates/index.html

@@ -7,62 +7,78 @@
         <script src="https://unpkg.com/htmx.org@1.9.12"></script>
         <script src="https://unpkg.com/htmx.org@1.9.12/dist/ext/ws.js"></script>
         <script src="https://cdn.jsdelivr.net/npm/@tailwindcss/browser@4"></script>
-        <style>
+        <script src="https://unpkg.com/hyperscript.org@0.9.14"></script>
-            #ws-status {
-                position: fixed;
-                top: 10px;
-                right: 10px;
-                padding: 5px 10px;
-                border-radius: 5px;
-                font-weight: bold;
-            }
-            .connecting { background-color: orange; color: white; }
-            .connected { background-color: green; color: white; }
-            .disconnected { background-color: red; color: white; }
-            .error { background-color: darkred; color: white; }
-        </style>
         <script>
             window.onload = () => {
                 document.getElementById("chatInput").focus();
-                const messagesContainer = document.getElementById("chat_room");
-                messagesContainer.scrollTop = messagesContainer.scrollHeight;
             };
         </script>
     </head>
-    <body>
+    <body onload="window.scrollTo(0, document.body.scrollHeight);">
+
 
         <div class="flex flex-col gap-2 justify-center items-center" hx-ext="ws" ws-connect="/ws">
             <h2>WebSocket HTML Example</h2>
-            <div id="ws-status" class="disconnected">Disconnected</div>
+            <div id="ws-status"
-            <div id="notifications"></div>
+                 class="disconnected fixed top-0 right-0 px-2 py-1 rounded font-bold m-4"
-            <ul id="chat_room" hx-swap-oob='beforeend'>
+            >Disconnected</div>
+            <ul
+                id="notifications"
+                class="fixed top-0 left-0 px-2 py-1 rounded font-bold m-4"
+            ></ul>
+            <ul id="chat_room"
+                hx-swap-oob='beforeend'
+            >
             </ul>
-            <form id="form" ws-send class="flex gap-2 fixed bottom-0">
+
-                <input id="chatInput" name="chat_message" class='px-2 py-1 bg-gray-800 border border-gray-600 rounded' type="text">
+            <div id='after_chat_wrapper'>
+            </div>
+            <form id="form" ws-send class="flex gap-2 fixed bottom-0 w-full p-4 bg-gray-900">
+                <input id="chatInput" name="chat_message" class='w-124 min-h-24 rounded-lg px-2 py-1 mx-auto bg-gray-800 border border-gray-600 rounded' type="text">
             </form>
+            <div id="after_form" class='mb-24'>
+
+                <button
+                    id="go_to_bottom"
+                    class="fixed bottom-0 right-0 px-2 py-1 rounded font-bold m-4 invisible"
+                    hx-get="/null"
+                    hx-swap="outerHTML"
+                    hx-trigger="intersect from:#after_chat"
+                    _="
+                       on load
+                       wait 10ms
+                       remove .invisible
+                       on click
+                       go to bottom of the body
+                      "
+                >
+                    go to bottom
+                </button>
+            </div>
         </div>
     </body>
     <script>
         document.addEventListener("htmx:wsConnecting", function() {
-            updateStatus("Connecting...", "connecting");
+            updateStatus("Connecting...", "bg-orange-500");
         });
 
         document.addEventListener("htmx:wsOpen", function() {
-            updateStatus("Connected", "connected");
+            updateStatus("Connected", "bg-green-500");
         });
 
         document.addEventListener("htmx:wsClose", function() {
-            updateStatus("Disconnected", "disconnected");
+            updateStatus("Disconnected", "bg-red-500");
         });
 
         document.addEventListener("htmx:wsError", function() {
-            updateStatus("Error!", "error");
+            updateStatus("Error!", "bg-red-500");
         });
 
         function updateStatus(text, statusClass) {
             let statusElement = document.getElementById("ws-status");
             statusElement.textContent = text;
-            statusElement.className = statusClass;
+            statusElement.classList.remove('bg-orange-500', 'bg-green-500', 'bg-red-500');
+            statusElement.classList.add(statusClass);
         }
     </script>
 </html>