201 lines
5.6 KiB
HTML
201 lines
5.6 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Peer‑to‑Peer Poll – up to 14 users (no vote loops)</title>
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<style>
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body {font-family:Arial,Helvetica,sans-serif; margin:20px;}
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#options li {margin:5px 0;}
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button {margin-left:5px;}
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</style>
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</head>
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<body>
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<h2>Peer‑to‑Peer Poll (max 14 participants)</h2>
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<div id="setup">
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<label>Your Peer ID: <input id="myId" readonly size="30"></label><br><br>
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<label>Room host ID (leave empty if you are the first client):
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<input id="hostId" placeholder="host peer id">
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</label>
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<button id="joinBtn">Join / Create Room</button>
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<p id="status"></p>
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</div>
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<hr>
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<h3>Poll</h3>
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<ul id="options"></ul>
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<input id="newOption" placeholder="New option text">
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<button id="addOptionBtn">Add option</button>
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<script src="https://unpkg.com/peerjs@1.5.4/dist/peerjs.min.js"></script>
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<script>
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/* ---------- 1. Initialise PeerJS ---------- */
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const peer = new Peer(); // public signalling server
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const myIdInput = document.getElementById('myId');
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const statusEl = document.getElementById('status');
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let isHost = false; // true for the first client
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let connections = []; // all open DataConnections
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let knownPeers = new Set(); // IDs of every peer we know (including host)
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peer.on('open', id => {
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myIdInput.value = id;
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statusEl.textContent = 'Enter a host ID (or leave empty) and click Join.';
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});
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/* ---------- 2. Accept incoming connections (host side) ---------- */
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peer.on('connection', incoming => {
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registerConnection(incoming);
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});
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/* ---------- 3. Join / create a room ---------- */
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document.getElementById('joinBtn').onclick = () => {
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const hostId = document.getElementById('hostId').value.trim();
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if (hostId) {
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isHost = false;
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connectToPeer(hostId);
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statusEl.textContent = `Connecting to host ${hostId}…`;
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} else {
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isHost = true;
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knownPeers.add(peer.id);
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statusEl.textContent = 'Room created – share this Peer ID with others.';
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}
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};
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/* ---------- 4. Helper: connect to a remote peer ---------- */
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function connectToPeer(peerId) {
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if (knownPeers.has(peerId)) return;
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const conn = peer.connect(peerId);
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registerConnection(conn);
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}
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/* ---------- 5. Register a DataConnection ---------- */
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function registerConnection(conn) {
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if (!conn) return;
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connections.push(conn);
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knownPeers.add(conn.peer);
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conn.on('open', () => {
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// 1️⃣ Send full poll state
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conn.send({type: 'full', payload: poll, msgId: crypto.randomUUID()});
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// 2️⃣ If we are the host, tell the newcomer about other peers
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if (isHost) {
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const others = Array.from(knownPeers).filter(id => id !== conn.peer && id !== peer.id);
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if (others.length) conn.send({type: 'peer-list', payload: others, msgId: crypto.randomUUID()});
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}
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});
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conn.on('data', data => handleMessage(data, conn.peer));
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conn.on('close', () => {
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connections = connections.filter(c => c !== conn);
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knownPeers.delete(conn.peer);
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});
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}
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/* ---------- 6. Shared poll state ---------- */
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let poll = {options: []}; // each option: {id, text, votes}
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/* ---------- 7. Track my own votes ---------- */
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const myVotes = new Set(); // option.id values
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/* ---------- 8. Remember which messages we already processed ---------- */
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const seenMsgIds = new Set();
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/* ---------- 9. Broadcast helper (skip the sender) ---------- */
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function broadcast(msg, except = null) {
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connections.forEach(c => {
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if (c.open && c.peer !== except) c.send(msg);
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});
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}
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/* ---------- 10. Message handling ---------- */
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function handleMessage(msg, senderId) {
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// Ignore duplicates
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if (seenMsgIds.has(msg.msgId)) return;
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seenMsgIds.add(msg.msgId);
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switch (msg.type) {
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case 'full':
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poll = msg.payload;
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render();
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break;
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case 'add':
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poll.options.push(msg.payload);
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render();
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broadcast(msg, senderId); // forward once
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break;
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case 'vote':
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const opt = poll.options.find(o => o.id === msg.payload.id);
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if (opt) opt.votes++;
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render();
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broadcast(msg, senderId);
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break;
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case 'peer-list':
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msg.payload.forEach(id => {
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if (id !== peer.id && !knownPeers.has(id)) connectToPeer(id);
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});
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break;
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}
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}
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/* ---------- 11. UI rendering ---------- */
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function render() {
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const ul = document.getElementById('options');
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ul.innerHTML = '';
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poll.options.forEach(opt => {
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const li = document.createElement('li');
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li.textContent = `${opt.text} – ${opt.votes} vote(s)`;
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const btn = document.createElement('button');
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btn.textContent = myVotes.has(opt.id) ? 'Voted' : 'Vote';
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btn.disabled = myVotes.has(opt.id);
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btn.onclick = () => {
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// Record locally – prevents double‑click on the same client
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myVotes.add(opt.id);
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btn.textContent = 'Voted';
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btn.disabled = true;
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const voteMsg = {
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type: 'vote',
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payload: {id: opt.id},
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msgId: crypto.randomUUID()
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};
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// Apply locally first
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opt.votes++;
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render();
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// Send to all peers
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broadcast(voteMsg);
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};
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li.appendChild(btn);
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ul.appendChild(li);
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});
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}
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/* ---------- 12. Add new option ---------- */
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document.getElementById('addOptionBtn').onclick = () => {
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const txt = document.getElementById('newOption').value.trim();
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if (!txt) return;
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const option = {id: crypto.randomUUID(), text: txt, votes: 0};
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poll.options.push(option);
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render();
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const addMsg = {
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type: 'add',
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payload: option,
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msgId: crypto.randomUUID()
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};
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broadcast(addMsg);
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document.getElementById('newOption').value = '';
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};
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</script>
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</body>
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</html>
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