opencompletion.com/templates/chat.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Chatroom</title>

    <!-- Include highlight.js library -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.6.0/highlight.min.js"></script>
    <!-- Include a highlight.js theme (replace 'default' with your preferred theme) -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.6.0/styles/default.min.css">

    <script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.0.1/socket.io.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/marked/9.1.2/marked.min.js" integrity="sha512-rfX4p3RNnxdwLT3wWP1K0NR3ztTobn+sISlT9WhxDDK00zNYbQ6MCHA5OHm0hqKAzEMXYCgFrp8iY/ER5MkXqA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

    <style>
    html, body {
        height: 100%;
        margin: 0;
        padding: 0;
        font-family: Arial, sans-serif;
        background-color: #f7f7f7;
        display: grid;
        place-items: center;
    }
    
    #chat-container {
        display: grid;
        grid-template-rows: 1fr auto;
        width: 100%;
        height: 90vh;
        background-color: #ffffff;
        border-radius: 5px;
        padding: 15px;
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
        box-sizing: border-box;
    }
    
    #chat {
        overflow-y: auto;
        border: 1px solid #e1e1e1;
        border-radius: 5px;
        padding: 10px;
        margin-bottom: 10px;
        min-width: 400px;
    }
    
    #message {
        width: 100%;
        border: 1px solid #e1e1e1;
        border-radius: 5px;
        padding: 5px;
    }

   </style>
</head>
<body>
    <div id="chat-container">
        <div id="chat"></div>
        <form id="message-form">
            <textarea id="message" rows="4" placeholder="Type your message..."></textarea>
        </form>
    </div>

    <script>

const socket = io.connect('http://' + document.domain + ':' + location.port);

const urlParams = new URLSearchParams(window.location.search);
const username = urlParams.get('username');
const room = '{{ room }}';

// Function to handle sending the message
function sendMessage() {
    const message = document.getElementById('message').value;
    if (message.trim() !== "") {  // Ensure we're not sending empty messages
        socket.emit('message', {'username': username, 'message': message, 'room': room});
        document.getElementById('message').value = '';
    }
}

// Event listener for form submission
document.getElementById('message-form').addEventListener('submit', (e) => {
    e.preventDefault();
    sendMessage();
});

// Event listener for the Enter key press in the textarea
document.getElementById('message').addEventListener('keydown', function(e) {
    if (e.key === 'Enter' && !e.shiftKey) {
        e.preventDefault();
        sendMessage();
    }
});

socket.on('connect', () => {
    socket.emit('join', {username: username, room: room});
});

socket.on('message', (data) => {
    const newMessage = document.createElement('p');
    
    // Set the message ID as the id attribute
    newMessage.id = "message-" + data.id; // Prefixing with "message-" to ensure the ID starts with a letter
    
    // Convert the message content to markdown and set it as the innerHTML
    newMessage.innerHTML = marked.marked(data.content);
    
    // Append the new message to the chat container
    document.getElementById('chat').appendChild(newMessage);

    // Apply syntax highlighting to any code blocks within the message
    newMessage.querySelectorAll('pre code').forEach((block) => {
        hljs.highlightElement(block);
    });

    // Scroll to the bottom of the chat container
    document.getElementById('chat').scrollTop = document.getElementById('chat').scrollHeight;
});


socket.on('previous_messages', (data) => {
    const chat = document.getElementById('chat');
    
    // Create a new message element
    const newMessage = document.createElement('p');
    
    // Set the ID attribute for the message
    newMessage.id = "message-" + data.id;
    
    // Set the inner content for the message
    newMessage.innerHTML = `${data.username}: ${marked.marked(data.message)}`;
    
    // Append the new message to the chat container
    chat.appendChild(newMessage);

    // Apply syntax highlighting to any code blocks within the message
    newMessage.querySelectorAll('pre code').forEach((block) => {
        hljs.highlightElement(block);
    });
});


socket.on('delete_processing_message', (data) => {
    const tempMessage = document.getElementById("processing");
    if (tempMessage) {
        tempMessage.remove();
    }
});


// A dictionary to hold buffers for each message ID
const messageBuffers = {};

socket.on('message_chunk', (data) => {
    const messageId = "message-" + data.id;
    let targetMessageElement = document.getElementById(messageId);

    // If the target message element doesn't exist, it's an initial chunk
    if (!targetMessageElement) {
        targetMessageElement = document.createElement('p');
        targetMessageElement.id = messageId;
        document.getElementById('chat').appendChild(targetMessageElement);
    }

    // If the message buffer for this ID doesn't exist, create it
    if (!messageBuffers[data.id]) {
        messageBuffers[data.id] = "";
    }

    // Append the chunk to the buffer
    messageBuffers[data.id] += data.content;

    // Process the entire buffer with marked and set it as the content of the target element
    targetMessageElement.innerHTML = marked.marked(messageBuffers[data.id]);

    // Apply syntax highlighting to code blocks within the content
    targetMessageElement.querySelectorAll('pre code').forEach((block) => {
        hljs.highlightElement(block);
    });

    // Scroll to the bottom of the chat container
    document.getElementById('chat').scrollTop = document.getElementById('chat').scrollHeight;
});

 
    </script>
</body>

</html>