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proposal-8
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proposal-5
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.gitignore
vendored
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.gitignore
vendored
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node_modules/
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200
PollingApp.html
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200
PollingApp.html
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<!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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56
README.md
56
README.md
@@ -1,55 +1,7 @@
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# P2P Poll App
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# P2P Poll App
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A peer-to-peer polling app built with [Automerge](https://automerge.org/) and Vanilla JS. No backend required — polls sync in real time across browsers using CRDTs and a WebSocket relay.
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This is a very simple polling app using peerjs.
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It runs as a single HTML file and can handle multiple users in one poll room.
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The app once open is self explanatory.
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App created with the help of GPTOSS120B.
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## Features
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- **Add options** — type an option and press Enter or click "Add Option". Duplicate options (case-insensitive) are rejected with an inline error message.
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- **Vote on options** — click the vote button next to any option. You can vote on multiple options, but only once per option.
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- **Toggle votes** — click your vote again to remove it (the button turns green with a checkmark when you've voted).
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- **Live vote counts** — options are sorted by vote count in descending order and update in real time as votes come in from other users.
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- **2-minute countdown timer** — click "Start 2-min Vote" to begin a shared countdown. Voting is open before and during the countdown. Once the timer expires, all vote buttons are disabled.
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- **Shared timer** — the deadline is stored in the Automerge document, so all peers see the same countdown and voting closes simultaneously for everyone.
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- **Copy URL** — click "Copy URL" to copy the poll link to your clipboard. Share it with others to join the same poll.
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- **P2P sync** — all state (options, votes, timer) syncs across browsers in real time with no central server handling your data.
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## How it works
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### Tech stack
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- **[Automerge](https://automerge.org/)** via `@automerge/vanillajs` — a CRDT library that lets multiple clients concurrently edit shared documents and merge changes without conflicts.
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- **BroadcastChannelNetworkAdapter** — syncs between tabs in the same browser instantly via the browser's BroadcastChannel API.
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- **WebSocketClientAdapter** — syncs across different browsers/devices via a WebSocket relay (`wss://sync.automerge.org`). The relay only forwards CRDT messages; it does not store or interpret your data.
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- **IndexedDBStorageAdapter** — persists the document locally so it survives page refreshes.
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- **Vite** — bundles the app with WebAssembly support (required by Automerge).
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### Data model
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The poll is a single Automerge document with three fields:
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```js
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{
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options: string[], // list of poll options in insertion order
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votes: { [option]: number }, // vote count per option
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deadline: number | null // Unix timestamp (ms) when voting closes, or null
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}
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```
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### URL-based sharing
|
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Each document gets a unique Automerge URL (e.g. `automerge:abc123...`) stored in the page's URL hash. Opening the same URL in any browser loads and syncs the same document. Creating a new poll generates a new document and updates the hash automatically.
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### Voting rules
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- Voted options are tracked in `localStorage` (keyed by document URL), so they persist across page refreshes but are isolated per browser.
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- One vote per option per user. Votes can be toggled off and back on until the timer expires.
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- The timer (`doc.deadline`) is set once by whoever clicks "Start 2-min Vote" and is shared via the Automerge document, so all peers use the same deadline.
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|
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## Running locally
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|
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```bash
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pnpm install
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pnpm dev
|
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||||||
```
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Open the printed localhost URL. To test cross-browser sync, copy the URL (including the `#automerge:...` hash) and open it in a different browser.
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214
app.js
214
app.js
@@ -1,214 +0,0 @@
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import {
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Repo,
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BroadcastChannelNetworkAdapter,
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WebSocketClientAdapter,
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IndexedDBStorageAdapter,
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isValidAutomergeUrl,
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} from "@automerge/vanillajs";
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const REPO = new Repo({
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network: [
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new BroadcastChannelNetworkAdapter(),
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new WebSocketClientAdapter("wss://sync.automerge.org"),
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|
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],
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storage: new IndexedDBStorageAdapter(),
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|
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});
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let HANDLE;
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function getVotedKey(docUrl) {
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return `p2p-poll-voted:${docUrl}`;
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}
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|
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function getVotedOptions() {
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const key = getVotedKey(document.location.hash);
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return new Set(JSON.parse(localStorage.getItem(key) || "[]"));
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}
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|
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function markVoted(opt) {
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const key = getVotedKey(document.location.hash);
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const voted = getVotedOptions();
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voted.add(opt);
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localStorage.setItem(key, JSON.stringify([...voted]));
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|
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}
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|
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function unmarkVoted(opt) {
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||||||
const key = getVotedKey(document.location.hash);
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|
||||||
const voted = getVotedOptions();
|
|
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voted.delete(opt);
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|
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localStorage.setItem(key, JSON.stringify([...voted]));
|
|
||||||
}
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|
||||||
|
|
||||||
const locationHash = document.location.hash.substring(1);
|
|
||||||
const statusEl = document.getElementById("status");
|
|
||||||
const optionsList = document.getElementById("options-list");
|
|
||||||
const optionInput = document.getElementById("option-input");
|
|
||||||
const addBtn = document.getElementById("add-btn");
|
|
||||||
const duplicateMsg = document.getElementById("duplicate-msg");
|
|
||||||
const copyBtn = document.getElementById("copy-btn");
|
|
||||||
const timerEl = document.getElementById("timer");
|
|
||||||
const startVotingBtn = document.getElementById("start-voting-btn");
|
|
||||||
|
|
||||||
if (isValidAutomergeUrl(locationHash)) {
|
|
||||||
statusEl.textContent = "Loading document…";
|
|
||||||
try {
|
|
||||||
HANDLE = await REPO.find(locationHash);
|
|
||||||
statusEl.textContent = "";
|
|
||||||
} catch (err) {
|
|
||||||
statusEl.textContent = "Could not load document. Starting a new one.";
|
|
||||||
HANDLE = REPO.create({ options: [], votes: {}, deadline: null });
|
|
||||||
document.location.hash = HANDLE.url;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
HANDLE = REPO.create({ options: [], votes: {}, deadline: null });
|
|
||||||
document.location.hash = HANDLE.url;
|
|
||||||
}
|
|
||||||
|
|
||||||
HANDLE.on("change", ({ doc }) => render(doc));
|
|
||||||
|
|
||||||
const initialDoc = HANDLE.doc();
|
|
||||||
if (initialDoc) render(initialDoc);
|
|
||||||
|
|
||||||
let timerInterval = null;
|
|
||||||
|
|
||||||
function render(doc) {
|
|
||||||
renderOptions(doc);
|
|
||||||
renderTimer(doc);
|
|
||||||
}
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|
||||||
|
|
||||||
function renderOptions(doc) {
|
|
||||||
const votes = doc.votes || {};
|
|
||||||
const deadline = doc.deadline ?? null;
|
|
||||||
const now = Date.now();
|
|
||||||
const votingClosed = deadline !== null && now >= deadline;
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|
||||||
const votedOptions = getVotedOptions();
|
|
||||||
|
|
||||||
const sorted = [...(doc.options || [])].sort(
|
|
||||||
(a, b) => (votes[b] || 0) - (votes[a] || 0),
|
|
||||||
);
|
|
||||||
|
|
||||||
optionsList.innerHTML = "";
|
|
||||||
sorted.forEach((opt) => {
|
|
||||||
const count = votes[opt] || 0;
|
|
||||||
const alreadyVoted = votedOptions.has(opt);
|
|
||||||
|
|
||||||
const item = document.createElement("div");
|
|
||||||
item.className = "option-item";
|
|
||||||
|
|
||||||
const label = document.createElement("span");
|
|
||||||
label.className = "option-label";
|
|
||||||
label.textContent = opt;
|
|
||||||
|
|
||||||
const voteBtn = document.createElement("button");
|
|
||||||
voteBtn.className = alreadyVoted ? "vote-btn voted" : "vote-btn";
|
|
||||||
voteBtn.textContent = alreadyVoted ? `✓ ${count}` : `▲ ${count}`;
|
|
||||||
voteBtn.disabled = votingClosed;
|
|
||||||
if (votingClosed) voteBtn.title = "Voting is closed";
|
|
||||||
else if (alreadyVoted) voteBtn.title = "Click to remove your vote";
|
|
||||||
|
|
||||||
voteBtn.addEventListener("click", () => {
|
|
||||||
if (alreadyVoted) {
|
|
||||||
unmarkVoted(opt);
|
|
||||||
HANDLE.change((d) => {
|
|
||||||
if (!d.votes) d.votes = {};
|
|
||||||
d.votes[opt] = Math.max(0, (d.votes[opt] || 0) - 1);
|
|
||||||
});
|
|
||||||
} else {
|
|
||||||
markVoted(opt);
|
|
||||||
HANDLE.change((d) => {
|
|
||||||
if (!d.votes) d.votes = {};
|
|
||||||
d.votes[opt] = (d.votes[opt] || 0) + 1;
|
|
||||||
});
|
|
||||||
}
|
|
||||||
});
|
|
||||||
|
|
||||||
item.appendChild(label);
|
|
||||||
item.appendChild(voteBtn);
|
|
||||||
optionsList.appendChild(item);
|
|
||||||
});
|
|
||||||
}
|
|
||||||
|
|
||||||
function renderTimer(doc) {
|
|
||||||
const deadline = doc?.deadline ?? null;
|
|
||||||
const now = Date.now();
|
|
||||||
|
|
||||||
if (deadline === null) {
|
|
||||||
timerEl.textContent = "";
|
|
||||||
startVotingBtn.hidden = false;
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
|
|
||||||
startVotingBtn.hidden = true;
|
|
||||||
|
|
||||||
if (now >= deadline) {
|
|
||||||
timerEl.textContent = "Voting closed.";
|
|
||||||
timerEl.className = "timer closed";
|
|
||||||
clearInterval(timerInterval);
|
|
||||||
timerInterval = null;
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
|
|
||||||
const remaining = Math.ceil((deadline - now) / 1000);
|
|
||||||
const mins = Math.floor(remaining / 60);
|
|
||||||
const secs = remaining % 60;
|
|
||||||
timerEl.textContent = `Voting closes in ${mins}:${secs.toString().padStart(2, "0")}`;
|
|
||||||
timerEl.className = "timer active";
|
|
||||||
|
|
||||||
if (!timerInterval) {
|
|
||||||
timerInterval = setInterval(() => {
|
|
||||||
const d = HANDLE.doc();
|
|
||||||
if (!d) return;
|
|
||||||
renderTimer(d);
|
|
||||||
renderOptions(d);
|
|
||||||
if (Date.now() >= d.deadline) {
|
|
||||||
clearInterval(timerInterval);
|
|
||||||
timerInterval = null;
|
|
||||||
}
|
|
||||||
}, 1000);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
startVotingBtn.addEventListener("click", () => {
|
|
||||||
HANDLE.change((d) => {
|
|
||||||
d.deadline = Date.now() + 2 * 60 * 1000;
|
|
||||||
});
|
|
||||||
});
|
|
||||||
|
|
||||||
addBtn.addEventListener("click", () => {
|
|
||||||
const value = optionInput.value.trim();
|
|
||||||
if (!value) return;
|
|
||||||
|
|
||||||
const doc = HANDLE.doc();
|
|
||||||
const valueLower = value.toLowerCase();
|
|
||||||
const isDuplicate = (doc?.options || []).some(
|
|
||||||
(opt) => opt.toLowerCase() === valueLower,
|
|
||||||
);
|
|
||||||
|
|
||||||
if (isDuplicate) {
|
|
||||||
duplicateMsg.textContent = `"${value}" is already in the list.`;
|
|
||||||
duplicateMsg.hidden = false;
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
|
|
||||||
duplicateMsg.hidden = true;
|
|
||||||
HANDLE.change((d) => {
|
|
||||||
if (!d.options) d.options = [];
|
|
||||||
d.options.push(value);
|
|
||||||
});
|
|
||||||
optionInput.value = "";
|
|
||||||
});
|
|
||||||
|
|
||||||
optionInput.addEventListener("keydown", (e) => {
|
|
||||||
if (e.key === "Enter") addBtn.click();
|
|
||||||
});
|
|
||||||
|
|
||||||
optionInput.addEventListener("input", () => {
|
|
||||||
duplicateMsg.hidden = true;
|
|
||||||
});
|
|
||||||
|
|
||||||
copyBtn.addEventListener("click", () => {
|
|
||||||
navigator.clipboard.writeText(window.location.href).then(() => {
|
|
||||||
copyBtn.textContent = "Copied!";
|
|
||||||
setTimeout(() => (copyBtn.textContent = "Copy URL"), 1500);
|
|
||||||
});
|
|
||||||
});
|
|
||||||
31
index.html
31
index.html
@@ -1,31 +0,0 @@
|
|||||||
<!doctype html>
|
|
||||||
<html lang="en">
|
|
||||||
<head>
|
|
||||||
<meta charset="UTF-8" />
|
|
||||||
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
|
|
||||||
<title>P2P Polling App</title>
|
|
||||||
<link rel="stylesheet" href="./styles.css" />
|
|
||||||
</head>
|
|
||||||
<body>
|
|
||||||
<div id="app">
|
|
||||||
<h1>P2P Polling App</h1>
|
|
||||||
<div id="status"></div>
|
|
||||||
<div id="add-option">
|
|
||||||
<input
|
|
||||||
type="text"
|
|
||||||
id="option-input"
|
|
||||||
placeholder="Enter an option..."
|
|
||||||
/>
|
|
||||||
<button id="add-btn">Add Option</button>
|
|
||||||
</div>
|
|
||||||
<div id="duplicate-msg" hidden></div>
|
|
||||||
<div id="timer-section">
|
|
||||||
<div id="timer"></div>
|
|
||||||
<button id="start-voting-btn">Start 2-min Vote</button>
|
|
||||||
</div>
|
|
||||||
<div id="options-list"></div>
|
|
||||||
<button id="copy-btn">Copy URL</button>
|
|
||||||
</div>
|
|
||||||
<script type="module" src="./app.js"></script>
|
|
||||||
</body>
|
|
||||||
</html>
|
|
||||||
23
package.json
23
package.json
@@ -1,23 +0,0 @@
|
|||||||
{
|
|
||||||
"name": "p2p-poll-app",
|
|
||||||
"type": "module",
|
|
||||||
"engines": {
|
|
||||||
"node": ">=24"
|
|
||||||
},
|
|
||||||
"scripts": {
|
|
||||||
"dev": "vite",
|
|
||||||
"build": "vite build",
|
|
||||||
"preview": "vite preview"
|
|
||||||
},
|
|
||||||
"dependencies": {
|
|
||||||
"@automerge/automerge-repo": "^2.0.0",
|
|
||||||
"@automerge/automerge-repo-network-websocket": "^2.0.0",
|
|
||||||
"@automerge/automerge-repo-storage-indexeddb": "^2.0.0",
|
|
||||||
"@automerge/vanillajs": "^2.5.3"
|
|
||||||
},
|
|
||||||
"devDependencies": {
|
|
||||||
"vite": "^6.0.0",
|
|
||||||
"vite-plugin-top-level-await": "^1.4.0",
|
|
||||||
"vite-plugin-wasm": "^3.3.0"
|
|
||||||
}
|
|
||||||
}
|
|
||||||
1083
pnpm-lock.yaml
generated
1083
pnpm-lock.yaml
generated
File diff suppressed because it is too large
Load Diff
93
styles.css
93
styles.css
@@ -1,93 +0,0 @@
|
|||||||
body {
|
|
||||||
font-family: sans-serif;
|
|
||||||
max-width: 480px;
|
|
||||||
margin: 40px auto;
|
|
||||||
padding: 0 16px;
|
|
||||||
}
|
|
||||||
|
|
||||||
#add-option {
|
|
||||||
display: flex;
|
|
||||||
gap: 8px;
|
|
||||||
margin-bottom: 8px;
|
|
||||||
}
|
|
||||||
|
|
||||||
#option-input {
|
|
||||||
flex: 1;
|
|
||||||
padding: 8px;
|
|
||||||
font-size: 1rem;
|
|
||||||
border: 1px solid #ccc;
|
|
||||||
border-radius: 4px;
|
|
||||||
}
|
|
||||||
|
|
||||||
#duplicate-msg {
|
|
||||||
color: #c00;
|
|
||||||
font-size: 0.9rem;
|
|
||||||
margin-bottom: 12px;
|
|
||||||
}
|
|
||||||
|
|
||||||
button {
|
|
||||||
padding: 8px 16px;
|
|
||||||
font-size: 1rem;
|
|
||||||
cursor: pointer;
|
|
||||||
border: 1px solid #ccc;
|
|
||||||
border-radius: 4px;
|
|
||||||
background: #fff;
|
|
||||||
}
|
|
||||||
|
|
||||||
button:hover:not(:disabled) {
|
|
||||||
background: #f0f0f0;
|
|
||||||
}
|
|
||||||
|
|
||||||
button:disabled {
|
|
||||||
opacity: 0.5;
|
|
||||||
cursor: default;
|
|
||||||
}
|
|
||||||
|
|
||||||
#timer-section {
|
|
||||||
display: flex;
|
|
||||||
align-items: center;
|
|
||||||
gap: 12px;
|
|
||||||
margin-bottom: 16px;
|
|
||||||
}
|
|
||||||
|
|
||||||
.timer.active {
|
|
||||||
font-weight: bold;
|
|
||||||
color: #1a6e1a;
|
|
||||||
}
|
|
||||||
|
|
||||||
.timer.closed {
|
|
||||||
font-weight: bold;
|
|
||||||
color: #c00;
|
|
||||||
}
|
|
||||||
|
|
||||||
.option-item {
|
|
||||||
display: flex;
|
|
||||||
align-items: center;
|
|
||||||
justify-content: space-between;
|
|
||||||
padding: 10px 12px;
|
|
||||||
border: 1px solid #ddd;
|
|
||||||
border-radius: 4px;
|
|
||||||
margin-bottom: 8px;
|
|
||||||
}
|
|
||||||
|
|
||||||
.option-label {
|
|
||||||
flex: 1;
|
|
||||||
}
|
|
||||||
|
|
||||||
.vote-btn {
|
|
||||||
padding: 4px 12px;
|
|
||||||
font-size: 0.9rem;
|
|
||||||
white-space: nowrap;
|
|
||||||
}
|
|
||||||
|
|
||||||
.vote-btn.voted {
|
|
||||||
background: #e6f4e6;
|
|
||||||
border-color: #4a9e4a;
|
|
||||||
color: #2a6e2a;
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
#copy-btn {
|
|
||||||
margin-top: 16px;
|
|
||||||
width: 100%;
|
|
||||||
}
|
|
||||||
@@ -1,7 +0,0 @@
|
|||||||
import { defineConfig } from 'vite'
|
|
||||||
import wasm from 'vite-plugin-wasm'
|
|
||||||
import topLevelAwait from 'vite-plugin-top-level-await'
|
|
||||||
|
|
||||||
export default defineConfig({
|
|
||||||
plugins: [wasm(), topLevelAwait()]
|
|
||||||
})
|
|
||||||
Reference in New Issue
Block a user