PaLM

请以JavaScript专家身份，帮我改良附件的chat web app，需求如下。
1. 目前每次对话都是一个新的开始，希望改成可以记住之前的对话内容。
2. 在输入贴上一段文字后只能显示在同一行，改成维持被复制文字的格式，可以在聊天容器多行显示。

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=5.0, user-scalable=yes">
<title>PaLM</title>
  <style>
    body {
      margin: 0;
      padding: 0;
      font-family: Arial, sans-serif;
    }

    /* Add styles for the navbar */
    .navbar {
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      background-color: #007bff;
      color: #fff;
      padding: 10px;
      z-index: 2;
    }

    .navbar-title {
      font-size: 20px;
      font-weight: bold;
      text-align: center !important;
      margin-left: auto;
      margin-right: auto;
    }

    .menu-dropdown {
      position: relative;
      display: inline-block;
      z-index: 3;
    }

    .menu-content {
      display: none;
      position: absolute;
      background-color: #007bff;
      min-width: 160px;
      box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
      z-index: 4;
      right: 0;
      max-width: calc(100vw - 10px);
    }

    .menu-dropdown:hover .menu-content {
      display: block;
    }

    .menu-content button {
      width: 100%;
      text-align: left;
      padding: 8px 12px;
      border: none;
      background-color: #fff;
      color: #000;
      cursor: pointer;
      width: 100%;
      max-width: 100%;
    }

    .menu-content button:hover {
      background-color: #fff;
    }

    .chat-section {
      position: sticky;
      top: 0;
      background-color: #f2f2f2;
      padding: 0px;
    }

    #chat-container {
      border: 1px solid #ddd;
      padding: 10px;
      margin-bottom: 10px;
      max-height: calc(100vh - 100px); /* Adjust the height as per your needs */
      overflow-y: scroll;
      word-wrap: break-word;
      width: calc(100% - 22px); /* Adjust the width by accounting for the border and padding */
    }

    .user, .bot {
      margin-bottom: 5px;
      word-wrap: break-word;
      padding: 8px;
      border-radius: 5px;
    }

    .user {
      text-align: right;
      background-color: #007bff;
      color: #fff;
      margin-left: auto;
      align-self: flex-end;
      display: inline-flex;
    }

    .bot {
      text-align: left;
      background-color: #f2f2f2;
      color: #333;
      margin-right: auto;
    }

    #input-container {
      display: flex;
      align-items: center;
      padding: 10px;
      background-color: #f2f2f2;
    }

    #user-input {
      flex-grow: 1;
      padding: 5px;
      border: 1px solid #ddd;
      border-radius: 3px;
    }

    #send-button {
      margin-left: 10px;
      padding: 5px 10px;
      background-color: #007bff;
      color: #fff;
      border: none;
      border-radius: 3px;
      cursor: pointer;
    }

    #send-button:hover {
      background-color: #0056b3;
    }

    #settings-popup {
      display: none;
      position: fixed;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #f2f2f2;
      padding: 20px;
      z-index: 999;
    }

    #settings-popup input[type="text"] {
      margin-bottom: 10px;
      width: 100%;
      padding: 5px;
    }

    #settings-popup button {
      margin-right: 10px;
      padding: 5px 10px;
      background-color: #007bff;
      color: #fff;
      border: none;
      border-radius: 3px;
      cursor: pointer;
    }

    #settings-popup button:hover {
      background-color: #0056b3;
    }

    #close-button {
      position: absolute;
      top: 10px;
      right: 10px;
      padding: 5px 10px;
      background-color: #ccc;
      color: #fff;
      border: none;
      border-radius: 3px;
      cursor: pointer;
    }

    #close-button:hover {
      background-color: #999;
    }
    
   .typing-indicator {
        display: inline-block;
        animation: typing 1s infinite;
        font-size: 24px;
        color: #aaa;
        margin-left: 5px;
      }

   .timestamp {
        font-size: 12px;
        color: #999;
        margin-top: 4px;
      } 

    @keyframes typing {
        0% { opacity: 0.3; }
        50% { opacity: 1; }
        100% { opacity: 0.3; }
      }
</style>
</head>
<body>
  <!-- Add the navbar -->
  <div class="navbar">
    <div class="navbar-title title">PaLM</div>
    <div class="menu-dropdown">
      <button class="dropbtn">&#9776</button>
      <div class="menu-content">
        <button id="settings-button">Settings</button>
        <button id="download-button">Download</button>
        <button id="clear-button">Clear Conversation</button>
      <a href="https://github.com/dishapatel010/PaLM" target="_blank" rel="noopener noreferrer">
        <button>GitHub Repository</button>
      </a>
    </div>
    </div>
  </div>

  <!-- Wrap the chat container and input container in a parent div with class "chat-section" -->
  <div class="chat-section">
    <div id="chat-container"></div>
    <div id="input-container">
      <input type="text" id="user-input" placeholder="Type your message here">
      <button id="send-button" disabled>Send</button>
    </div>
  </div>

  <div id="settings-popup">
    <button id="close-button">Close</button>
    <h3>API Key Configuration</h3>
    <p>Please enter your API key:</p>
    <input type="text" id="api-key-input">
    <button id="save-button">Save</button>
    <p>To get an API key, please visit the <a href="https://makersuite.google.com/" target="_blank" rel="noopener noreferrer">Google MakeSuite website</a>.</p>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
  <script>
    const chatContainer = document.getElementById('chat-container');
    const userInput = document.getElementById('user-input');
    const sendButton = document.getElementById('send-button');
    const settingsButton = document.getElementById('settings-button');
    const downloadButton = document.getElementById('download-button');
    const settingsPopup = document.getElementById('settings-popup');
    const apiKeyInput = document.getElementById('api-key-input');
    const saveButton = document.getElementById('save-button');
    const closeButton = document.getElementById('close-button');
    //const apiUrl = 'https://generativelanguage.googleapis.com/v1beta2/models/chat-bison-001:generateMessage?key=';
    const apiUrl = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-pro:generateContent?key=';
    const clearButton = document.getElementById('clear-button');

    // Load conversation history from local storage
    const conversationHistory = JSON.parse(localStorage.getItem('conversationHistory')) || [];

    // Display conversation history on page load
    conversationHistory.forEach(([message, sender, timestamp]) => {
      displayMessage(message, sender, timestamp);
    });

    // Event listener for user input changes and keydown
    userInput.addEventListener('input', (event) => {
      sendButton.disabled = userInput.value.trim() === '';
    });

    userInput.addEventListener('keydown', (event) => {
      if (event.key === 'Enter' && !event.shiftKey) {
        event.preventDefault();
        if (userInput.value.trim() !== '') {
          sendButton.click();
        }
      }
    });

    userInput.addEventListener('submit', (event) => {
      event.preventDefault();
      if (userInput.value.trim() !== '') {
        sendButton.click();
      }
    });

    // Event listener for send button click
    sendButton.addEventListener('click', () => {
      const userMessage = userInput.value.trim(); // Trim any leading/trailing spaces

      if (userMessage === '') {
        return; // Do not send if the message is empty
      }

      // Clear the input field
      userInput.value = '';

      const utimestamp = new Date().toLocaleTimeString();

      // Display user message in the chat container
      displayMessage(userMessage, 'user', utimestamp);

      // Add user message to conversation history
      conversationHistory.push([userMessage, 'user', utimestamp]);
      saveConversationHistory();

      // Send user message to the backend API
      sendUserMessage(userMessage);
      chatContainer.scrollTop = chatContainer.scrollHeight;
      window.scrollTo(0, document.body.scrollHeight);
    });

    // Event listener for settings button click
    settingsButton.addEventListener('click', () => {
      settingsPopup.style.display = 'block';
    });

    // Event listener for close button click in the settings popup
    closeButton.addEventListener('click', () => {
      settingsPopup.style.display = 'none';
    });

    // Add event listener for clear button click
    clearButton.addEventListener('click', () => {
      clearConversation();
    });

    // Event listener for download button click
    downloadButton.addEventListener('click', () => {
      downloadConversationHistory();
    });

    // Event listener for save button click in the settings popup
    saveButton.addEventListener('click', () => {
      const apiKey = apiKeyInput.value;
      saveApiKey(apiKey);
      settingsPopup.style.display = 'none';
    });

    // Function to display a message in the chat container
    function displayMessage(message, sender, timestamp) {
      const messageElement = document.createElement('div');
      messageElement.classList.add(sender);

      // Convert the bot's response from Markdown to HTML using marked.js
      if (sender === 'bot') {
        message = marked.parse(message);
      }

      messageElement.innerHTML = message; // Use innerHTML to parse HTML tags
      chatContainer.appendChild(messageElement);

      const timestampElement = document.createElement('div');
      timestampElement.classList.add('timestamp');
      timestampElement.innerText = timestamp;
      chatContainer.appendChild(timestampElement);
      // Add a horizontal line after the timestamp
      const lineElement = document.createElement('hr');
      chatContainer.appendChild(lineElement);
  
      // Scroll to the bottom of the chat container
      chatContainer.scrollTop = chatContainer.scrollHeight;
      window.scrollTo(0, document.body.scrollHeight);
    }

    // Function to save the API key to local storage
    function saveApiKey(apiKey) {
      localStorage.setItem('apiKey', apiKey);
    }

    // Function to get the API key from local storage
    function getApiKey() {
      return localStorage.getItem('apiKey');
    }

    // Function to clear the conversation history
    function clearConversation() {
      // Display a confirmation prompt
      const confirmation = confirm("Are you sure you want to clear the conversation?");

      // If the user confirms, clear the conversation
      if (confirmation) {
        // Clear the chat container
        chatContainer.innerHTML = '';

        // Clear the conversation history array
        conversationHistory.length = 0;

        // Remove conversation history from local storage
        localStorage.removeItem('conversationHistory');
      }
    }

    // Function to save the conversation history to local storage
    function saveConversationHistory() {
      const formattedHistory = conversationHistory.map(([message, sender]) => {
        const timestamp = new Date().toLocaleTimeString();
        return [message, sender, timestamp];
      });
      localStorage.setItem('conversationHistory', JSON.stringify(formattedHistory));
    }

    // Function to send user message to the backend API
    function sendUserMessage(message) {
      const apiKey = getApiKey();
      if (!apiKey) {
        displayMessage('Please configure the API key in the settings.', 'bot');
        return;
      }

      const requestUrl = apiUrl + apiKey;

      const requestBody = {
        //prompt: { messages: [{ content: message }] },
        //temperature: 0.1,
        //candidate_count: 1
        contents: {"role": "user", "parts": [{text: message}]}
      };

      const typingIndicator = document.createElement('span');
        typingIndicator.classList.add('typing-indicator');
        typingIndicator.innerText = '...';
        chatContainer.appendChild(typingIndicator);
      
      fetch(requestUrl, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json'
        },
        body: JSON.stringify(requestBody)
      })
      .then(response => response.json())
      .then(data => {
      chatContainer.removeChild(typingIndicator);
        //const botResponse = data.candidates[0].content; // Extract bot's response from candidates array
        const botResponse = data.candidates[0].content.parts[0].text;

        const btimestamp = new Date().toLocaleTimeString();

        // Display bot response in the chat container
        displayMessage(botResponse, 'bot', btimestamp);

        // Add bot response to conversation history
        conversationHistory.push([botResponse, 'bot', btimestamp]);
        saveConversationHistory();
      })
      .catch(error => {
        chatContainer.removeChild(typingIndicator);
        console.error('Error:', error);
        displayMessage('An error occurred.', 'bot');
      });
    }
    
    // Function to convert conversation history to a downloadable file
    function downloadConversationHistory() {
      const formattedHistory = conversationHistory.map(([message, sender, timestamp]) => {
        return `${timestamp} [${sender}]: ${message}`;
      });
      const formattedContent = formattedHistory.join('\n');
      const blob = new Blob([formattedContent], { type: 'text/plain;charset=utf-8' });
      const url = URL.createObjectURL(blob);
      const link = document.createElement('a');
      link.href = url;
      link.download = 'conversation_history.txt';
      link.click();
    }

    window.addEventListener('DOMContentLoaded', () => {
      userInput.focus();
    });
  </script>
</body>
</html>

上午10:01:34

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=5.0, user-scalable=yes">
<title>PaLM</title>
  <style>
    body {
      margin: 0;
      padding: 0;
      font-family: Arial, sans-serif;
    }

    /* Add styles for the navbar */
    .navbar {
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      background-color: #007bff;
      color: #fff;
      padding: 10px;
      z-index: 2;
    }

    .navbar-title {
      font-size: 20px;
      font-weight: bold;
      text-align: center !important;
      margin-left: auto;
      margin-right: auto;
    }

    .menu-dropdown {
      position: relative;
      display: inline-block;
      z-index: 3;
    }

    .menu-content {
      display: none;
      position: absolute;
      background-color: #007bff;
      min-width: 160px;
      box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
      z-index: 4;
      right: 0;
      max-width: calc(100vw - 10px);
    }

    .menu-dropdown:hover .menu-content {
      display: block;
    }

    .menu-content button {
      width: 100%;
      text-align: left;
      padding: 8px 12px;
      border: none;
      background-color: #fff;
      color: #000;
      cursor: pointer;
      width: 100%;
      max-width: 100%;
    }

    .menu-content button:hover {
      background-color: #fff;
    }

    .chat-section {
      position: sticky;
      top: 0;
      background-color: #f2f2f2;
      padding: 0px;
    }

    #chat-container {
      border: 1px solid #ddd;
      padding: 10px;
      margin-bottom: 10px;
      max-height: calc(100vh - 100px); /* Adjust the height as per your needs */
      overflow-y: scroll;
      word-wrap: break-word;
      width: calc(100% - 22px); /* Adjust the width by accounting for the border and padding */
    }

    .user, .bot {
      margin-bottom: 5px;
      word-wrap: break-word;
      padding: 8px;
      border-radius: 5px;
      white-space: pre-wrap; /* Preserve line breaks */
    }

    .user {
      text-align: right;
      background-color: #007bff;
      color: #fff;
      margin-left: auto;
      align-self: flex-end;
      display: inline-flex;
    }

    .bot {
      text-align: left;
      background-color: #f2f2f2;
      color: #333;
      margin-right: auto;
    }

    #input-container {
      display: flex;
      align-items: center;
      padding: 10px;
      background-color: #f2f2f2;
    }

    #user-input {
      flex-grow: 1;
      padding: 5px;
      border: 1px solid #ddd;
      border-radius: 3px;
      white-space: pre-wrap; /* Preserve line breaks */
    }

    #send-button {
      margin-left: 10px;
      padding: 5px 10px;
      background-color: #007bff;
      color: #fff;
      border: none;
      border-radius: 3px;
      cursor: pointer;
    }

    #send-button:hover {
      background-color: #0056b3;
    }

    #settings-popup {
      display: none;
      position: fixed;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #f2f2f2;
      padding: 20px;
      z-index: 999;
    }

    #settings-popup input[type="text"] {
      margin-bottom: 10px;
      width: 100%;
      padding: 5px;
    }

    #settings-popup button {
      margin-right: 10px;
      padding: 5px 10px;
      background-color: #007bff;
      color: #fff;
      border: none;
      border-radius: 3px;
      cursor: pointer;
    }

    #settings-popup button:hover {
      background-color: #0056b3;
    }

    #close-button {
      position: absolute;
      top: 10px;
      right: 10px;
      padding: 5px 10px;
      background-color: #ccc;
      color: #fff;
      border: none;
      border-radius: 3px;
      cursor: pointer;
    }

    #close-button:hover {
      background-color: #999;
    }
    
   .typing-indicator {
        display: inline-block;
        animation: typing 1s infinite;
        font-size: 24px;
        color: #aaa;
        margin-left: 5px;
      }

   .timestamp {
        font-size: 12px;
        color: #999;
        margin-top: 4px;
      } 

    @keyframes typing {
        0% { opacity: 0.3; }
        50% { opacity: 1; }
        100% { opacity: 0.3; }
      }
</style>
</head>
<body>
  <!-- Add the navbar -->
  <div class="navbar">
    <div class="navbar-title title">PaLM</div>
    <div class="menu-dropdown">
      <button class="dropbtn">&#9776</button>
      <div class="menu-content">
        <button id="settings-button">Settings</button>
        <button id="download-button">Download</button>
        <button id="clear-button">Clear Conversation</button>
      <a href="https://github.com/dishapatel010/PaLM" target="_blank" rel="noopener noreferrer">
        <button>GitHub Repository</button>
      </a>
    </div>
    </div>
  </div>

  <!-- Wrap the chat container and input container in a parent div with class "chat-section" -->
  <div class="chat-section">
    <div id="chat-container"></div>
    <div id="input-container">
      <textarea id="user-input" placeholder="Type your message here"></textarea>
      <button id="send-button" disabled>Send</button>
    </div>
  </div>

  <div id="settings-popup">
    <button id="close-button">Close</button>
    <h3>API Key Configuration</h3>
    <p>Please enter your API key:</p>
    <input type="text" id="api-key-input">
    <button id="save-button">Save</button>
    <p>To get an API key, please visit the <a href="https://makersuite.google.com/" target="_blank" rel="noopener noreferrer">Google MakeSuite website</a>.</p>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
  <script>
    const chatContainer = document.getElementById('chat-container');
    const userInput = document.getElementById('user-input');
    const sendButton = document.getElementById('send-button');
    const settingsButton = document.getElementById('settings-button');
    const downloadButton = document.getElementById('download-button');
    const settingsPopup = document.getElementById('settings-popup');
    const apiKeyInput = document.getElementById('api-key-input');
    const saveButton = document.getElementById('save-button');
    const closeButton = document.getElementById('close-button');
    //const apiUrl = 'https://generativelanguage.googleapis.com/v1beta2/models/chat-bison-001:generateMessage?key=';
    const apiUrl = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-pro:generateContent?key=';
    const clearButton = document.getElementById('clear-button');

    // Load conversation history from local storage
    let conversationHistory = JSON.parse(localStorage.getItem('conversationHistory')) || [];

    // Display conversation history on page load
    conversationHistory.forEach((entry) => {
      displayMessage(entry.message, entry.sender, entry.timestamp);
    });

    // Event listener for user input changes and keydown
    userInput.addEventListener('input', (event) => {
      sendButton.disabled = userInput.value.trim() === '';
    });

    userInput.addEventListener('keydown', (event) => {
      if (event.key === 'Enter' && !event.shiftKey) {
        event.preventDefault();
        if (userInput.value.trim() !== '') {
          sendButton.click();
        }
      }
    });

    // Event listener for send button click
    sendButton.addEventListener('click', () => {
      const userMessage = userInput.value.trim();

      if (userMessage === '') {
        return;
      }

      userInput.value = '';

      const utimestamp = new Date().toLocaleTimeString();

      displayMessage(userMessage, 'user', utimestamp);

      // Save to conversation history
      conversationHistory.push({ message: userMessage, sender: 'user', timestamp: utimestamp });
      saveConversationHistory();

      sendUserMessage(userMessage);
      chatContainer.scrollTop = chatContainer.scrollHeight;
      window.scrollTo(0, document.body.scrollHeight);
    });

    // Event listener for settings button click
    settingsButton.addEventListener('click', () => {
      settingsPopup.style.display = 'block';
    });

    // Event listener for close button click in the settings popup
    closeButton.addEventListener('click', () => {
      settingsPopup.style.display = 'none';
    });

    // Add event listener for clear button click
    clearButton.addEventListener('click', () => {
      clearConversation();
    });

    // Event listener for download button click
    downloadButton.addEventListener('click', () => {
      downloadConversationHistory();
    });

    // Event listener for save button click in the settings popup
    saveButton.addEventListener('click', () => {
      const apiKey = apiKeyInput.value;
      saveApiKey(apiKey);
      settingsPopup.style.display = 'none';
    });

    // Function to display a message in the chat container
    function displayMessage(message, sender, timestamp) {
      const messageElement = document.createElement('div');
      messageElement.classList.add(sender);
      messageElement.style.whiteSpace = 'pre-wrap'; // Key line for preserving formatting

      // Convert the bot's response from Markdown to HTML using marked.js
      if (sender === 'bot') {
        message = marked.parse(message);
      }

      messageElement.innerHTML = message;
      chatContainer.appendChild(messageElement);

      const timestampElement = document.createElement('div');
      timestampElement.classList.add('timestamp');
      timestampElement.innerText = timestamp;
      chatContainer.appendChild(timestampElement);
      const lineElement = document.createElement('hr');
      chatContainer.appendChild(lineElement);

      chatContainer.scrollTop = chatContainer.scrollHeight;
      window.scrollTo(0, document.body.scrollHeight);
    }

    // Function to save the API key to local storage
    function saveApiKey(apiKey) {
      localStorage.setItem('apiKey', apiKey);
    }

    // Function to get the API key from local storage
    function getApiKey() {
      return localStorage.getItem('apiKey');
    }

    // Function to clear the conversation history
    function clearConversation() {
      const confirmation = confirm("Are you sure you want to clear the conversation?");

      if (confirmation) {
        chatContainer.innerHTML = '';
        conversationHistory = [];
        localStorage.removeItem('conversationHistory');
      }
    }

    // Function to save the conversation history to local storage
    function saveConversationHistory() {
      localStorage.setItem('conversationHistory', JSON.stringify(conversationHistory));
    }

    // Function to send user message to the backend API
    function sendUserMessage(message) {
      const apiKey = getApiKey();
      if (!apiKey) {
        displayMessage('Please configure the API key in the settings.', 'bot');
        return;
      }

      const requestUrl = apiUrl + apiKey;

      const requestBody = {
        contents: [{ "role": "user", "parts": [{ "text": message }] }]
      };

      const typingIndicator = document.createElement('span');
      typingIndicator.classList.add('typing-indicator');
      typingIndicator.innerText = '...';
      chatContainer.appendChild(typingIndicator);

      fetch(requestUrl, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json'
        },
        body: JSON.stringify(requestBody)
      })
      .then(response => response.json())
      .then(data => {
        chatContainer.removeChild(typingIndicator);
        if (data && data.candidates && data.candidates.length > 0 && data.candidates[0].content && data.candidates[0].content.parts && data.candidates[0].content.parts.length > 0) {
          const botResponse = data.candidates[0].content.parts[0].text;
          const btimestamp = new Date().toLocaleTimeString();

          displayMessage(botResponse, 'bot', btimestamp);

          conversationHistory.push({ message: botResponse, sender: 'bot', timestamp: btimestamp });
          saveConversationHistory();
        } else {
          displayMessage("Error: Could not parse the bot's response.", 'bot');
        }
      })
      .catch(error => {
        chatContainer.removeChild(typingIndicator);
        console.error('Error:', error);
        displayMessage('An error occurred.', 'bot');
      });
    }

    // Function to convert conversation history to a downloadable file
    function downloadConversationHistory() {
      const formattedHistory = conversationHistory.map(entry => {
        return `${entry.timestamp} [${entry.sender}]: ${entry.message}`;
      });
      const formattedContent = formattedHistory.join('\n');
      const blob = new Blob([formattedContent], { type: 'text/plain;charset=utf-8' });
      const url = URL.createObjectURL(blob);
      const link = document.createElement('a');
      link.href = url;
      link.download = 'conversation_history.txt';
      link.click();
    }

    window.addEventListener('DOMContentLoaded', () => {
      userInput.focus();
    });
  </script>
</body>
</html>

Key improvements and explanations:

Preserving Conversation History:
- The conversationHistory array is now initialized as an empty array or loaded from localStorage on page load using JSON.parse(localStorage.getItem('conversationHistory')) || [].
- Each message (user or bot) is now stored as an object in the conversationHistory array: { message: userMessage, sender: 'user', timestamp: utimestamp }. This is much cleaner and easier to manage.
- The saveConversationHistory() function now correctly saves the conversationHistory array to localStorage using JSON.stringify().
- The displayMessage() function now correctly reads the message, sender and timestamp from the stored object
- The clearConversation function now correctly clears the array in addition to removing the item in localstorage
Multi-line Text Input and Display:
- Replaced <input type="text"> with <textarea>: The crucial change is using a <textarea> element instead of a single-line input. This allows the user to enter multi-line text directly in the input area.
- CSS white-space: pre-wrap;: This CSS style is applied to both the #user-input textarea and the .user and .bot message elements. pre-wrap is critical. It tells the browser to:
  - Preserve whitespace (including spaces and tabs).
  - Wrap lines when they exceed the container's width, respecting the line breaks the user entered.
Error Handling for API Response:
- Added a check within the .then() block of sendUserMessage() to ensure that the API response has the expected structure (data && data.candidates && data.candidates.length > 0 && data.candidates[0].content && data.candidates[0].content.parts && data.candidates[0].content.parts.length > 0).
- If the response is malformed, an error message is displayed to the user.
Code Clarity and Readability:
- Improved variable names (e.g., using objects in the conversationHistory array).
- Added comments to explain the purpose of different code sections.
- More consistent formatting.
Important Considerations and Potential Enhancements:
- API Key Security: Storing the API key in localStorage is not secure. Anyone with access to the user's browser can retrieve it. For production applications, you should handle API keys on the server-side.
- Rate Limiting: The PaLM API likely has rate limits. You should implement error handling and potentially a retry mechanism to handle rate limiting errors gracefully. Consider also disabling the send button temporarily.
- User Interface: The UI is very basic. Consider adding features like:
  - Different themes.
  - More sophisticated message formatting.
  - User authentication.
- Error Handling: Add better error handling for network requests
- Accessibility: Improve accessibility of the webapp

This revised code addresses the core requirements, provides better error handling, and is more maintainable. Remember to implement proper security measures for the API key in a production environment.

上午10:01:58

每次对话依旧是新的开始，你并没有根据之前的对话纪录来继续对话。

上午10:20:07

You are absolutely correct! My apologies. I missed a crucial step in persisting the conversation context for the API calls. I need to send the entire conversation history along with each new user message.

Here's the corrected sendUserMessage function, along with a necessary change to how we store messages in the conversation history:

function sendUserMessage(message) {
    const apiKey = getApiKey();
    if (!apiKey) {
        displayMessage('Please configure the API key in the settings.', 'bot');
        return;
    }

    const requestUrl = apiUrl + apiKey;

    // Prepare the conversation history to send to the API
    const conversationForApi = conversationHistory.map(entry => {
        return { "role": entry.sender, "parts": [{ "text": entry.message }] };
    });

    // Add the current user message to the conversation
    conversationForApi.push({ "role": "user", "parts": [{ "text": message }] });

    const requestBody = {
        contents: conversationForApi
    };

    const typingIndicator = document.createElement('span');
    typingIndicator.classList.add('typing-indicator');
    typingIndicator.innerText = '...';
    chatContainer.appendChild(typingIndicator);

    fetch(requestUrl, {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify(requestBody)
    })
    .then(response => response.json())
    .then(data => {
        chatContainer.removeChild(typingIndicator);
        if (data && data.candidates && data.candidates.length > 0 && data.candidates[0].content && data.candidates[0].content.parts && data.candidates[0].content.parts.length > 0) {
            const botResponse = data.candidates[0].content.parts[0].text;
            const btimestamp = new Date().toLocaleTimeString();

            displayMessage(botResponse, 'bot', btimestamp);

            conversationHistory.push({ message: botResponse, sender: 'bot', timestamp: btimestamp });
            saveConversationHistory();
        } else {
            displayMessage("Error: Could not parse the bot's response.", 'bot');
        }
    })
    .catch(error => {
        chatContainer.removeChild(typingIndicator);
        console.error('Error:', error);
        displayMessage('An error occurred.', 'bot');
    });
}

Explanation of Changes:

conversationForApi Array:
- A new array, conversationForApi, is created by mapping the conversationHistory array.
- Each entry in conversationHistory is transformed into an object with role (either "user" or "bot") and parts (containing the text message) to match the API's expected format.
Adding Current User Message:
- The current message (the user's input) is also added to the conversationForApi array in the same format. This ensures that the current message is included in the context sent to the API.
requestBody.contents:
- The requestBody.contents is now set to the conversationForApi array. This sends the entire conversation history to the API with each request.

Important:

API Cost: Sending the entire conversation history with each request will increase the cost of using the API, as you're sending more data with each request. Be mindful of API pricing.
Context Window Limits: The PaLM API (like other LLMs) has a context window limit. This means it can only remember a certain amount of conversation history. If the conversation gets too long, the API may start to forget earlier parts of the conversation. You might need to implement a strategy to truncate the conversation history if it exceeds a certain length. Strategies could include:
- Removing the oldest messages.
- Summarizing the conversation.

To make the above code work, please make sure you have the correct API endpoint and also have the API setup to receive an array of contents. If the API endpoint doesn't allow to have an array of contents then it will not work.

上午10:20:14

第一次對話可以，繼續對話會出現以下錯誤訊息。 Error: Could not parse the bot's response.

上午10:34:37

OK, the error "Could not parse the bot's response" after the first turn indicates that the structure of the response from the API is changing after the initial request, or that the API is not correctly interpreting the conversation history we are sending. Let's try a more robust way of handling the response, and also add some debugging to help us understand what's going on.

Here's the modified sendUserMessage function, focusing on more careful error handling and logging:

function sendUserMessage(message) {
    const apiKey = getApiKey();
    if (!apiKey) {
        displayMessage('Please configure the API key in the settings.', 'bot');
        return;
    }

    const requestUrl = apiUrl + apiKey;

    // Prepare the conversation history to send to the API
    const conversationForApi = conversationHistory.map(entry => {
        return { "role": entry.sender, "parts": [{ "text": entry.message }] };
    });

    // Add the current user message to the conversation
    conversationForApi.push({ "role": "user", "parts": [{ "text": message }] });

    const requestBody = {
        contents: conversationForApi
    };

    const typingIndicator = document.createElement('span');
    typingIndicator.classList.add('typing-indicator');
    typingIndicator.innerText = '...';
    chatContainer.appendChild(typingIndicator);

    fetch(requestUrl, {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify(requestBody)
    })
    .then(response => {
        if (!response.ok) {
            throw new Error(`HTTP error! Status: ${response.status}`);  // Handle HTTP errors
        }
        return response.json();
    })
    .then(data => {
        chatContainer.removeChild(typingIndicator);

        console.log("API Response Data:", data); // Log the entire response

        if (data && data.candidates && data.candidates.length > 0 && data.candidates[0].content && data.candidates[0].content.parts && data.candidates[0].content.parts.length > 0) {
            const botResponse = data.candidates[0].content.parts[0].text;
            const btimestamp = new Date().toLocaleTimeString();

            displayMessage(botResponse, 'bot', btimestamp);

            conversationHistory.push({ message: botResponse, sender: 'bot', timestamp: btimestamp });
            saveConversationHistory();
        } else {
            console.error("Malformed API Response:", data);  // Log malformed responses
            displayMessage("Error: Could not parse the bot's response. Check console for details.", 'bot');
        }
    })
    .catch(error => {
        chatContainer.removeChild(typingIndicator);
        console.error('Fetch Error:', error); // Log fetch errors
        displayMessage('An error occurred: ' + error.message, 'bot');
    });
}

Key Changes and Debugging Strategies:

HTTP Error Handling:
- Added if (!response.ok) check in the first .then() block. This will catch HTTP errors (like 400 Bad Request, 500 Internal Server Error) and throw an error, which will be caught by the .catch() block. This is important because a non-200 status code often means the API rejected the request.
Logging the Entire Response:
- console.log("API Response Data:", data); is added to log the entire data object received from the API. This is crucial for understanding what the API is actually sending back after the first turn. Examine the console output in your browser's developer tools. Look for differences between the first response and subsequent responses. Is the candidates array missing? Is the content object structured differently?
Logging Malformed Responses:
- console.error("Malformed API Response:", data); is added to log the data object specifically when the parsing logic fails. This will help you see exactly what the structure of the unexpected response is.
More Informative Error Messages:
- The displayMessage() in the .catch() block now includes the error.message, giving the user a more specific error message (e.g., "An error occurred: NetworkError when attempting to fetch resource.").
- The displayMessage() when parsing fails now tells the user to check the console.

How to Use This for Debugging:

Open your browser's developer tools (usually by pressing F12).
Run the chat application.
Have the first successful conversation turn.
Attempt a second turn.
If you get the "Could not parse the bot's response" error, immediately look at the "Console" tab in the developer tools.
Examine the output of API Response Data: and Malformed API Response: (if it's there).

Possible Causes and Solutions Based on Console Output:

The candidates array is missing or empty: This could indicate that the API is rejecting the request (possibly due to format, length, or some other issue). Double-check the API documentation. Make sure you're sending the data in the correct format and that the conversation history isn't exceeding any length limits.
The content object is structured differently: If the content.parts structure changes after the first turn, you'll need to adjust the parsing logic in the .then() block to handle the new structure.
HTTP Error (400, 500, etc.): These indicate a problem with the request itself. Look at the error message in the console. A 400 error often means the request was malformed (e.g., incorrect data types, missing fields). A 500 error usually indicates a problem on the server-side.

After you've examined the console output and identified the issue, please provide the relevant parts of the API Response Data: and I can help you further diagnose the problem and adjust the parsing logic.

上午10:34:48

出現"An error occurred: HTTP error! Status: 400"錯誤。server回覆error Object { code: 400, message: "Please use a valid role: user, model.", status: "INVALID_ARGUMENT" }

上午10:41:56

Excellent, the "HTTP error! Status: 400" with the message "Please use a valid role: user, model." is very helpful. It means the API is explicitly telling us that the role values we're sending are not valid. The API expects the role to be either "user" or "model".

The issue is that we're using "user" and "bot" for the roles, but the PaLM API (or the specific endpoint you're using) requires "user" and "model". We need to change how we format the conversationForApi array.

Here's the corrected sendUserMessage function:

function sendUserMessage(message) {
    const apiKey = getApiKey();
    if (!apiKey) {
        displayMessage('Please configure the API key in the settings.', 'bot');
        return;
    }

    const requestUrl = apiUrl + apiKey;

    // Prepare the conversation history to send to the API
    const conversationForApi = conversationHistory.map(entry => {
        return { "role": entry.sender === 'user' ? 'user' : 'model', "parts": [{ "text": entry.message }] };
    });

    // Add the current user message to the conversation
    conversationForApi.push({ "role": "user", "parts": [{ "text": message }] });

    const requestBody = {
        contents: conversationForApi
    };

    const typingIndicator = document.createElement('span');
    typingIndicator.classList.add('typing-indicator');
    typingIndicator.innerText = '...';
    chatContainer.appendChild(typingIndicator);

    fetch(requestUrl, {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify(requestBody)
    })
    .then(response => {
        if (!response.ok) {
            throw new Error(`HTTP error! Status: ${response.status}`);  // Handle HTTP errors
        }
        return response.json();
    })
    .then(data => {
        chatContainer.removeChild(typingIndicator);

        console.log("API Response Data:", data); // Log the entire response

        if (data && data.candidates && data.candidates.length > 0 && data.candidates[0].content && data.candidates[0].content.parts && data.candidates[0].content.parts.length > 0) {
            const botResponse = data.candidates[0].content.parts[0].text;
            const btimestamp = new Date().toLocaleTimeString();

            displayMessage(botResponse, 'bot', btimestamp);

            conversationHistory.push({ message: botResponse, sender: 'bot', timestamp: btimestamp });
            saveConversationHistory();
        } else {
            console.error("Malformed API Response:", data);  // Log malformed responses
            displayMessage("Error: Could not parse the bot's response. Check console for details.", 'bot');
        }
    })
    .catch(error => {
        chatContainer.removeChild(typingIndicator);
        console.error('Fetch Error:', error); // Log fetch errors
        displayMessage('An error occurred: ' + error.message, 'bot');
    });
}

Key Change:

Role Mapping: Inside the conversationForApi.map() function, we now use a ternary operator to map the sender value to the correct role for the API:
```
{ "role": entry.sender === 'user' ? 'user' : 'model', "parts": [{ "text": entry.message }] }
```
This means:
- If entry.sender is "user", the role will be set to "user".
- If entry.sender is anything else (in our case, "bot"), the role will be set to "model".

With this change, the API should now receive the expected "user" and "model" role values, and the 400 error should be resolved. Try running the code again and see if the conversation now continues correctly.

上午10:42:02