Harbor/spec/examples/basic-chat.html at main · r/Harbor · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Web Agent API Example: Basic Chat</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      max-width: 600px;
      margin: 0 auto;
      padding: 20px;
      background: #1a1a2e;
      color: #eee;
      min-height: 100vh;
    }
    h1 { margin-bottom: 20px; color: #fff; }
    .status {
      padding: 10px;
      border-radius: 8px;
      margin-bottom: 20px;
      font-size: 14px;
    }
    .status.available { background: #0d4d0d; }
    .status.unavailable { background: #4d0d0d; }
    .chat {
      background: #16213e;
      border-radius: 12px;
      padding: 20px;
      min-height: 300px;
      max-height: 400px;
      overflow-y: auto;
      margin-bottom: 20px;
    }
    .message {
      margin-bottom: 15px;
      padding: 10px 15px;
      border-radius: 8px;
    }
    .message.user {
      background: #0f3460;
      margin-left: 40px;
    }
    .message.assistant {
      background: #1a1a2e;
      margin-right: 40px;
    }
    .message .role {
      font-size: 11px;
      text-transform: uppercase;
      opacity: 0.6;
      margin-bottom: 5px;
    }
    .input-area {
      display: flex;
      gap: 10px;
    }
    input {
      flex: 1;
      padding: 12px 16px;
      border: none;
      border-radius: 8px;
      background: #16213e;
      color: #fff;
      font-size: 16px;
    }
    input:focus { outline: 2px solid #e94560; }
    button {
      padding: 12px 24px;
      border: none;
      border-radius: 8px;
      background: #e94560;
      color: #fff;
      font-weight: 600;
      cursor: pointer;
    }
    button:hover { background: #ff6b6b; }
    button:disabled { opacity: 0.5; cursor: not-allowed; }
    .code { font-family: monospace; background: #0f3460; padding: 2px 6px; border-radius: 4px; }
  </style>
</head>
<body>
  <h1>💬 Web Agent API: Basic Chat</h1>

  <div id="status" class="status unavailable">
    Checking Web Agent API availability...
  </div>

  <div id="chat" class="chat">
    <div class="message assistant">
      <div class="role">Assistant</div>
      <div>Hello! I'm ready to chat. Type a message below.</div>
    </div>
  </div>

  <div class="input-area">
    <input type="text" id="input" placeholder="Type a message..." disabled>
    <button id="send" disabled>Send</button>
  </div>

  <script type="module">
    const statusEl = document.getElementById('status');
    const chatEl = document.getElementById('chat');
    const inputEl = document.getElementById('input');
    const sendBtn = document.getElementById('send');

    let session = null;

    // Initialize
    async function init() {
      // Check if Web Agent API is available
      if (typeof window.agent === 'undefined') {
        statusEl.textContent = '❌ Web Agent API not available';
        return;
      }

      // Request permission
      const result = await window.agent.requestPermissions({
        scopes: ['model:prompt'],
        reason: 'This demo needs AI to chat with you.'
      });

      if (!result.granted) {
        statusEl.textContent = '❌ Permission denied';
        return;
      }

      // Create session
      try {
        session = await window.ai.createTextSession({
          systemPrompt: 'You are a friendly assistant. Be concise but helpful.'
        });

        statusEl.className = 'status available';
        statusEl.textContent = '✓ Web Agent API connected';
        inputEl.disabled = false;
        sendBtn.disabled = false;
        inputEl.focus();
      } catch (err) {
        statusEl.textContent = '❌ Error: ' + err.message;
      }
    }

    // Send message
    async function sendMessage() {
      const message = inputEl.value.trim();
      if (!message || !session) return;

      inputEl.value = '';
      sendBtn.disabled = true;

      // Add user message
      addMessage('user', message);

      // Add placeholder for assistant
      const assistantDiv = addMessage('assistant', '');

      try {
        // Stream the response
        for await (const event of session.promptStreaming(message)) {
          if (event.type === 'token') {
            assistantDiv.querySelector('.content').textContent += event.token;
            chatEl.scrollTop = chatEl.scrollHeight;
          } else if (event.type === 'error') {
            assistantDiv.querySelector('.content').textContent = 'Error: ' + event.error.message;
          }
        }
      } catch (err) {
        assistantDiv.querySelector('.content').textContent = 'Error: ' + err.message;
      }

      sendBtn.disabled = false;
      inputEl.focus();
    }

    function addMessage(role, content) {
      const div = document.createElement('div');
      div.className = `message ${role}`;
      div.innerHTML = `
        <div class="role">${role}</div>
        <div class="content">${content}</div>
      `;
      chatEl.appendChild(div);
      chatEl.scrollTop = chatEl.scrollHeight;
      return div;
    }

    // Event listeners
    sendBtn.addEventListener('click', sendMessage);
    inputEl.addEventListener('keypress', (e) => {
      if (e.key === 'Enter') sendMessage();
    });

    // Start
    init();
  </script>
</body>
</html>