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group-b7a2
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proposal-1
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39
README.md
39
README.md
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# P2P Poll App
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A peer-to-peer polling app where users can add options and vote on them. All data syncs directly between browsers using WebRTC — no central server stores any poll data.
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## How It Works
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- **Yjs CRDTs** handle shared state — concurrent edits from different peers merge automatically without conflicts
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- **y-webrtc** establishes direct WebRTC connections between browsers (a public signaling server is used only for peer discovery)
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- Each user gets a stable random ID (stored in localStorage) ensuring one vote per user per option
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- Polls are identified by room name, shareable via URL
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## Getting Started
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```bash
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npm install
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npm run dev
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```
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Open `http://localhost:5173` in your browser. To share a specific poll, use the `?room=` query parameter:
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```
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http://localhost:5173/?room=my-poll
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```
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Share this URL with others to join the same poll.
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## Cross-Device Testing
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```bash
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npm run dev -- --host
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```
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Then open `http://<your-local-ip>:5173/?room=test` on another device on the same network.
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## Tech Stack
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- [Yjs](https://yjs.dev/) — CRDT library for conflict-free shared state
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- [y-webrtc](https://github.com/yjs/y-webrtc) — WebRTC provider for P2P connectivity
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- [Vite](https://vite.dev/) — Dev server and bundler
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- Vanilla JS — No framework dependencies
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33
index.html
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33
index.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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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>P2P Poll</title>
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<link rel="stylesheet" href="/src/style.css">
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</head>
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<body>
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<div id="app">
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<header>
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<h1>P2P Poll</h1>
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<div id="status">
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<span id="connection-status" class="connecting">Connecting...</span>
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<span id="peer-count">1 peer</span>
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</div>
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</header>
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<main>
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<div id="add-option">
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<input type="text" id="option-input" placeholder="Add a poll option..." maxlength="100">
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<button id="add-btn">Add</button>
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</div>
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<div id="poll-options"></div>
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<p id="empty-state">No options yet. Add one above!</p>
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</main>
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</div>
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<script type="module" src="/src/main.js"></script>
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</body>
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</html>
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1437
package-lock.json
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1437
package-lock.json
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18
package.json
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18
package.json
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{
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"name": "p2p-poll",
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"private": true,
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"version": "1.0.0",
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"type": "module",
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"scripts": {
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"dev": "vite",
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"build": "vite build",
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"preview": "vite preview"
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},
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"dependencies": {
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"yjs": "^13.6.0",
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"y-webrtc": "^10.3.0"
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},
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"devDependencies": {
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"vite": "^6.0.0"
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}
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}
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136
src/main.js
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136
src/main.js
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import * as Y from 'yjs';
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import { WebrtcProvider } from 'y-webrtc';
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// --- Peer ID (stable across reloads) ---
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function getOrCreatePeerId() {
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let id = localStorage.getItem('peer-id');
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if (!id) {
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id = crypto.randomUUID();
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localStorage.setItem('peer-id', id);
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}
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return id;
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}
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const peerId = getOrCreatePeerId();
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// --- Room name from URL ---
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function getRoomName() {
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const params = new URLSearchParams(window.location.search);
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return params.get('room') || 'default-poll';
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}
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const roomName = getRoomName();
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// --- Yjs setup ---
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const ydoc = new Y.Doc();
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const provider = new WebrtcProvider(roomName, ydoc);
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const yOptions = ydoc.getMap('poll-options');
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// --- Data operations ---
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function addOption(name) {
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const id = crypto.randomUUID();
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const optionMap = new Y.Map();
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optionMap.set('name', name);
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optionMap.set('votes', new Y.Map());
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yOptions.set(id, optionMap);
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}
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function toggleVote(optionId) {
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const optionMap = yOptions.get(optionId);
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if (!optionMap) return;
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const votes = optionMap.get('votes');
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if (votes.has(peerId)) {
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votes.delete(peerId);
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} else {
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votes.set(peerId, true);
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}
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}
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// --- UI rendering ---
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const container = document.getElementById('poll-options');
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const emptyState = document.getElementById('empty-state');
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function render() {
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container.innerHTML = '';
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const entries = [];
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yOptions.forEach((optionMap, id) => {
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entries.push({
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id,
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name: optionMap.get('name'),
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votes: optionMap.get('votes').size,
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voted: optionMap.get('votes').has(peerId),
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});
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});
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entries.sort((a, b) => b.votes - a.votes || a.name.localeCompare(b.name));
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emptyState.className = entries.length > 0 ? 'hidden' : '';
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for (const entry of entries) {
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const div = document.createElement('div');
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div.className = 'poll-option';
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const nameSpan = document.createElement('span');
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nameSpan.className = 'option-name';
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nameSpan.textContent = entry.name;
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const voteCount = document.createElement('span');
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voteCount.className = 'vote-count';
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voteCount.textContent = entry.votes;
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const voteBtn = document.createElement('button');
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voteBtn.className = entry.voted ? 'vote-btn voted' : 'vote-btn';
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voteBtn.textContent = entry.voted ? 'Unvote' : 'Vote';
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voteBtn.addEventListener('click', () => toggleVote(entry.id));
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div.append(nameSpan, voteCount, voteBtn);
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container.appendChild(div);
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}
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}
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// Re-render on any change in the shared state
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yOptions.observeDeep(() => render());
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// --- Add option handlers ---
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const input = document.getElementById('option-input');
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const addBtn = document.getElementById('add-btn');
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addBtn.addEventListener('click', () => {
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const name = input.value.trim();
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if (name) {
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addOption(name);
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input.value = '';
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}
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});
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input.addEventListener('keydown', (e) => {
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if (e.key === 'Enter') addBtn.click();
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});
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// --- Connection status & peer count ---
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const statusEl = document.getElementById('connection-status');
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const peerCountEl = document.getElementById('peer-count');
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provider.on('synced', ({ synced }) => {
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statusEl.textContent = synced ? 'Connected' : 'Connecting...';
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statusEl.className = synced ? 'connected' : 'connecting';
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});
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function updatePeerCount() {
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const count = provider.awareness.getStates().size;
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peerCountEl.textContent = `${count} peer${count !== 1 ? 's' : ''}`;
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}
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provider.awareness.on('change', updatePeerCount);
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updatePeerCount();
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// --- Initial render ---
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render();
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144
src/style.css
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144
src/style.css
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* {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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}
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body {
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
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background: #f5f5f5;
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color: #333;
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min-height: 100vh;
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}
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#app {
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max-width: 600px;
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margin: 0 auto;
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padding: 2rem 1rem;
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}
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header {
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display: flex;
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justify-content: space-between;
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align-items: center;
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margin-bottom: 2rem;
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}
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h1 {
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font-size: 1.5rem;
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}
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#status {
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display: flex;
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gap: 1rem;
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font-size: 0.85rem;
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color: #666;
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}
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#connection-status::before {
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content: "";
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display: inline-block;
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width: 8px;
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height: 8px;
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border-radius: 50%;
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margin-right: 4px;
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vertical-align: middle;
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}
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#connection-status.connected::before {
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background: #4caf50;
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}
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#connection-status.connecting::before {
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background: #ff9800;
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}
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#add-option {
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display: flex;
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gap: 0.5rem;
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margin-bottom: 1.5rem;
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}
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#option-input {
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flex: 1;
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padding: 0.6rem 0.8rem;
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border: 1px solid #ddd;
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border-radius: 6px;
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font-size: 1rem;
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outline: none;
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}
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#option-input:focus {
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border-color: #2196f3;
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}
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#add-btn {
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padding: 0.6rem 1.2rem;
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background: #2196f3;
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color: white;
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border: none;
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border-radius: 6px;
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font-size: 1rem;
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cursor: pointer;
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}
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#add-btn:hover {
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background: #1976d2;
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}
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.poll-option {
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display: flex;
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align-items: center;
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background: white;
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padding: 0.8rem 1rem;
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border-radius: 8px;
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margin-bottom: 0.5rem;
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box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
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}
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.option-name {
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flex: 1;
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font-size: 1rem;
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}
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.vote-count {
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font-size: 0.9rem;
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font-weight: 600;
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color: #666;
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margin-right: 0.75rem;
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min-width: 1.5rem;
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text-align: center;
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}
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.vote-btn {
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padding: 0.4rem 1rem;
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border: 2px solid #2196f3;
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border-radius: 6px;
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font-size: 0.85rem;
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cursor: pointer;
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background: white;
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color: #2196f3;
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}
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.vote-btn:hover {
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background: #e3f2fd;
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}
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.vote-btn.voted {
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background: #2196f3;
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color: white;
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}
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.vote-btn.voted:hover {
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background: #1976d2;
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}
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#empty-state {
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text-align: center;
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color: #999;
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padding: 2rem;
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}
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#empty-state.hidden {
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display: none;
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}
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