Build A Google Gemini Chatbot with HTML CSS and JavaScript

Revolutionize Conversations: Build Your Own Google Gemini-Style Chatbot

The rise of AI chatbots like Google Gemini and ChatGPT has transformed the way we interact with technology, blurring the lines between human and machine conversations. As a beginner web developer, you might wonder: can I build my own AI chatbot? The answer is yes!

In this tutorial, I’ll show you how to create a Google Gemini-like chatbot using HTML, CSS, and JavaScript. Gemini, Google’s advanced chatbot model, uses artificial intelligence to generate human-like responses, making it a popular choice for natural conversations.

Project Overview

By following this guide, you’ll build a chatbot that enables users to:

Engage in conversations
Copy responses
Toggle between light and dark themes
Save chat history and theme preferences in local storage

This means that even after a page refresh, the user’s theme and chat history will persist. Get ready to create your own conversational AI chatbot and take your web development skills to the next level!

Table of Contents

How to start

To build an interactive and functional Gemini chatbot using HTML, CSS, and JavaScript, follow these simple step-by-step instructions:

Create a folder with any name you like, e.g., gemini-chatbot.
Inside it, create the necessary files: index.html, style.css, and script.js.
Download the Images folder and put it in your project directory. This folder contains logos you’ll need for this chatbot project.

In your index.html file, add the essential HTML markup to structure your Gemini chat layout. It features a greetings header, suggestion list, chat section, and typing form, all structured with semantic tags.

<!DOCTYPE html>

<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Gemini Chatbot | CodingNepal</title>
  <!-- Linking Google Fonts For Icons -->
  <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Material+Symbols+Rounded:opsz,wght,FILL,GRAD@24,400,0,0" />
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <header class="header">
    <!-- Header Greetings -->
    <h1 class="title">Hello, there</h1>
    <p class="subtitle">How can I help you today?</p>

    <!-- Suggestion list -->
    <ul class="suggestion-list">
      <li class="suggestion">
        <h4 class="text">Help me plan a game night with my 5 best friends for under $100.</h4>
        <span class="icon material-symbols-rounded">draw</span>
      </li>
      <li class="suggestion">
        <h4 class="text">What are the best tips to improve my public speaking skills?</h4>
        <span class="icon material-symbols-rounded">lightbulb</span>
      </li>
      <li class="suggestion">
        <h4 class="text">Can you help me find the latest news on web development?</h4>
        <span class="icon material-symbols-rounded">explore</span>
      </li>
      <li class="suggestion">
        <h4 class="text">Write JavaScript code to sum all elements in an array.</h4>
        <span class="icon material-symbols-rounded">code</span>
      </li>
    </ul>
  </header>

  <!-- Chat List / Container -->
  <div class="chat-list"></div>

  <!-- Typing Area -->
  <div class="typing-area">
    <form action="#" class="typing-form">
      <div class="input-wrapper">
        <input type="text" placeholder="Enter a prompt here" class="typing-input" required />
        <button id="send-message-button" class="icon material-symbols-rounded">send</button>
      </div>
      <div class="action-buttons">
        <span id="theme-toggle-button" class="icon material-symbols-rounded">light_mode</span>
        <span id="delete-chat-button" class="icon material-symbols-rounded">delete</span>
      </div>
    </form>
    <p class="disclaimer-text">
      Gemini may display inaccurate info, including about people, so double-check its responses.
    </p>
  </div>

  <script src="script.js"></script>
</body>
</html>

Styles.css File

/* Import Google Font - Poppins */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

:root {
  /* Dark mode colors */
  --text-color: #E3E3E3;
  --subheading-color: #828282;
  --placeholder-color: #A6A6A6;
  --primary-color: #242424;
  --secondary-color: #383838;
  --secondary-hover-color: #444;
}

.light_mode {
  /* Light mode colors */
  --text-color: #222;
  --subheading-color: #A0A0A0;
  --placeholder-color: #6C6C6C;
  --primary-color: #FFF;
  --secondary-color: #E9EEF6;
  --secondary-hover-color: #DBE1EA;
}

body {
  background: var(--primary-color);
}

.header, .chat-list .message, .typing-form {
  margin: 0 auto;
  max-width: 980px;
}

.header {
  margin-top: 6vh;
  padding: 1rem;
  overflow-x: hidden;
}

body.hide-header .header {
  margin: 0;
  display: none;
}

.header :where(.title, .subtitle) {
  color: var(--text-color);
  font-weight: 500;
  line-height: 4rem;
}

.header .title {
  width: fit-content;
  font-size: 3rem;
  background-clip: text;
  background: linear-gradient(to right, #4285f4, #d96570);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header .subtitle {
  font-size: 2.6rem;
  color: var(--subheading-color);
}

.suggestion-list {
  width: 100%;
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin-top: 9.5vh;
  overflow: hidden;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}

.suggestion-list .suggestion {
  cursor: pointer;
  padding: 1.25rem;
  width: 222px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  border-radius: 0.75rem;
  justify-content: space-between;
  background: var(--secondary-color);
  transition: 0.2s ease;
}

.suggestion-list .suggestion:hover {
  background: var(--secondary-hover-color);
}

.suggestion-list .suggestion :where(.text, .icon) {
  font-weight: 400;
  color: var(--text-color);
}

.suggestion-list .suggestion .icon {
  width: 42px;
  height: 42px;
  display: flex;
  font-size: 1.3rem;
  margin-top: 2.5rem;
  align-self: flex-end;
  align-items: center;
  border-radius: 50%;
  justify-content: center;
  color: var(--text-color);
  background: var(--primary-color);
}

.chat-list {
  padding: 2rem 1rem 12rem;
  max-height: 100vh;
  overflow-y: auto;
  scrollbar-color: #999 transparent;
}

.chat-list .message.incoming {
  margin-top: 1.5rem;
}

.chat-list .message .message-content {
  display: flex;
  gap: 1.5rem;
  width: 100%;
  align-items: center;
}

.chat-list .message .text {
  color: var(--text-color);
  white-space: pre-wrap;
}

.chat-list .message.error .text {
  color: #e55865;
}

.chat-list .message.loading .text {
  display: none;
}

.chat-list .message .avatar {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 50%;
  align-self: flex-start;
}

.chat-list .message.loading .avatar {
  animation: rotate 3s linear infinite;
}

@keyframes rotate {
  100% {
    transform: rotate(360deg);
  }
}

.chat-list .message .icon {
  color: var(--text-color);
  cursor: pointer;
  height: 35px;
  width: 35px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  font-size: 1.25rem;
  margin-left: 3.5rem;
  visibility: hidden;
}

.chat-list .message .icon.hide {
  visibility: hidden;
}

.chat-list .message:not(.loading, .error):hover .icon:not(.hide){
  visibility: visible;
}

.chat-list .message .icon:hover {
  background: var(--secondary-hover-color);
}

.chat-list .message .loading-indicator {
  display: none;
  gap: 0.8rem;
  width: 100%;
  flex-direction: column;
}

.chat-list .message.loading .loading-indicator {
  display: flex;
}

.chat-list .message .loading-indicator .loading-bar {
  height: 11px;
  width: 100%;
  border-radius: 0.135rem;
  background-position: -800px 0;
  background: linear-gradient(to right, #4285f4, var(--primary-color), #4285f4);
  animation: loading 3s linear infinite;
}

.chat-list .message .loading-indicator .loading-bar:last-child {
  width: 70%;
}

@keyframes loading {
  0% {
    background-position: -800px 0;
  }

  100% {
    background-position: 800px 0;
  }
}

.typing-area {
  position: fixed;
  width: 100%;
  left: 0;
  bottom: 0;
  padding: 1rem;
  background: var(--primary-color);
}

.typing-area :where(.typing-form, .action-buttons) {
  display: flex;
  gap: 0.75rem;
}

.typing-form .input-wrapper {
  width: 100%;
  height: 56px;
  display: flex;
  position: relative;
}

.typing-form .typing-input {
  height: 100%;
  width: 100%;
  border: none;
  outline: none;
  resize: none;
  font-size: 1rem;
  color: var(--text-color);
  padding: 1.1rem 4rem 1.1rem 1.5rem;
  border-radius: 100px;
  background: var(--secondary-color);
}

.typing-form .typing-input:focus {
  background: var(--secondary-hover-color);
}

.typing-form .typing-input::placeholder {
  color: var(--placeholder-color);
}

.typing-area .icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  font-size: 1.4rem;
  color: var(--text-color);
  align-items: center;
  justify-content: center;
  background: var(--secondary-color);
  transition: 0.2s ease;
}

.typing-area .icon:hover {
  background: var(--secondary-hover-color);
}

.typing-form #send-message-button {
  position: absolute;
  right: 0;
  outline: none;
  border: none;
  transform: scale(0);
  background: transparent;
  transition: transform 0.2s ease;
}

.typing-form .typing-input:valid ~ #send-message-button {
  transform: scale(1);
}

.typing-area .disclaimer-text {
  text-align: center;
  font-size: 0.85rem;
  margin-top: 1rem;
  color: var(--placeholder-color);
}

/* Responsive media query code for small screen */
@media (max-width: 768px) {
  .header :is(.title, .subtitle) {
    font-size: 2rem;
    line-height: 2.6rem;
  }

  .header .subtitle {
    font-size: 1.7rem;
  }

  .typing-area :where(.typing-form, .action-buttons) {
    gap: 0.4rem;
  }

  .typing-form .input-wrapper {
    height: 50px;
  }

  .typing-form .typing-input {
    padding: 1.1rem 3.5rem 1.1rem 1.2rem;
  }

  .typing-area .icon {
    height: 50px;
    width: 50px;
  }

  .typing-area .disclaimer-text {
    font-size: 0.75rem;
    margin-top: 0.5rem;
  }
}

Script.js file

const typingForm = document.querySelector(".typing-form");
const chatContainer = document.querySelector(".chat-list");
const suggestions = document.querySelectorAll(".suggestion");
const toggleThemeButton = document.querySelector("#theme-toggle-button");
const deleteChatButton = document.querySelector("#delete-chat-button");

// State variables
let userMessage = null;
let isResponseGenerating = false;

// API configuration
const API_KEY = "PASTE-YOUR-API-KEY"; // Your API key here
const API_URL = `https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent?key=${API_KEY}`;

// Load theme and chat data from local storage on page load
const loadDataFromLocalstorage = () => {
  const savedChats = localStorage.getItem("saved-chats");
  const isLightMode = (localStorage.getItem("themeColor") === "light_mode");

  // Apply the stored theme
  document.body.classList.toggle("light_mode", isLightMode);
  toggleThemeButton.innerText = isLightMode ? "dark_mode" : "light_mode";

  // Restore saved chats or clear the chat container
  chatContainer.innerHTML = savedChats || '';
  document.body.classList.toggle("hide-header", savedChats);

  chatContainer.scrollTo(0, chatContainer.scrollHeight); // Scroll to the bottom
}

// Create a new message element and return it
const createMessageElement = (content, ...classes) => {
  const div = document.createElement("div");
  div.classList.add("message", ...classes);
  div.innerHTML = content;
  return div;
}

// Show typing effect by displaying words one by one
const showTypingEffect = (text, textElement, incomingMessageDiv) => {
  const words = text.split(' ');
  let currentWordIndex = 0;

  const typingInterval = setInterval(() => {
    // Append each word to the text element with a space
    textElement.innerText += (currentWordIndex === 0 ? '' : ' ') + words[currentWordIndex++];
    incomingMessageDiv.querySelector(".icon").classList.add("hide");

    // If all words are displayed
    if (currentWordIndex === words.length) {
      clearInterval(typingInterval);
      isResponseGenerating = false;
      incomingMessageDiv.querySelector(".icon").classList.remove("hide");
      localStorage.setItem("saved-chats", chatContainer.innerHTML); // Save chats to local storage
    }
    chatContainer.scrollTo(0, chatContainer.scrollHeight); // Scroll to the bottom
  }, 75);
}

// Fetch response from the API based on user message
const generateAPIResponse = async (incomingMessageDiv) => {
  const textElement = incomingMessageDiv.querySelector(".text"); // Getting text element

  try {
    // Send a POST request to the API with the user's message
    const response = await fetch(API_URL, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ 
        contents: [{ 
          role: "user", 
          parts: [{ text: userMessage }] 
        }] 
      }),
    });

    const data = await response.json();
    if (!response.ok) throw new Error(data.error.message);

    // Get the API response text and remove asterisks from it
    const apiResponse = data.candidates[0].content.parts[0].text.replace(/\*\*(.*?)\*\*/g, '$1');
    showTypingEffect(apiResponse, textElement, incomingMessageDiv); // Show typing effect
  } catch (error) { // Handle error
    isResponseGenerating = false;
    textElement.innerText = error.message;
    textElement.parentElement.closest(".message").classList.add("error");
  } finally {
    incomingMessageDiv.classList.remove("loading");
  }
}

// Show a loading animation while waiting for the API response
const showLoadingAnimation = () => {
  const html = `<div class="message-content">
                  <img class="avatar" src="images/gemini.svg" alt="Gemini avatar">
                  <p class="text"></p>
                  <div class="loading-indicator">
                    <div class="loading-bar"></div>
                    <div class="loading-bar"></div>
                    <div class="loading-bar"></div>
                  </div>
                </div>
                <span onClick="copyMessage(this)" class="icon material-symbols-rounded">content_copy</span>`;

  const incomingMessageDiv = createMessageElement(html, "incoming", "loading");
  chatContainer.appendChild(incomingMessageDiv);

  chatContainer.scrollTo(0, chatContainer.scrollHeight); // Scroll to the bottom
  generateAPIResponse(incomingMessageDiv);
}

// Copy message text to the clipboard
const copyMessage = (copyButton) => {
  const messageText = copyButton.parentElement.querySelector(".text").innerText;

  navigator.clipboard.writeText(messageText);
  copyButton.innerText = "done"; // Show confirmation icon
  setTimeout(() => copyButton.innerText = "content_copy", 1000); // Revert icon after 1 second
}

// Handle sending outgoing chat messages
const handleOutgoingChat = () => {
  userMessage = typingForm.querySelector(".typing-input").value.trim() || userMessage;
  if(!userMessage || isResponseGenerating) return; // Exit if there is no message or response is generating

  isResponseGenerating = true;

  const html = `<div class="message-content">
                  <img class="avatar" src="images/user.jpg" alt="User avatar">
                  <p class="text"></p>
                </div>`;

  const outgoingMessageDiv = createMessageElement(html, "outgoing");
  outgoingMessageDiv.querySelector(".text").innerText = userMessage;
  chatContainer.appendChild(outgoingMessageDiv);
  
  typingForm.reset(); // Clear input field
  document.body.classList.add("hide-header");
  chatContainer.scrollTo(0, chatContainer.scrollHeight); // Scroll to the bottom
  setTimeout(showLoadingAnimation, 500); // Show loading animation after a delay
}

// Toggle between light and dark themes
toggleThemeButton.addEventListener("click", () => {
  const isLightMode = document.body.classList.toggle("light_mode");
  localStorage.setItem("themeColor", isLightMode ? "light_mode" : "dark_mode");
  toggleThemeButton.innerText = isLightMode ? "dark_mode" : "light_mode";
});

// Delete all chats from local storage when button is clicked
deleteChatButton.addEventListener("click", () => {
  if (confirm("Are you sure you want to delete all the chats?")) {
    localStorage.removeItem("saved-chats");
    loadDataFromLocalstorage();
  }
});

// Set userMessage and handle outgoing chat when a suggestion is clicked
suggestions.forEach(suggestion => {
  suggestion.addEventListener("click", () => {
    userMessage = suggestion.querySelector(".text").innerText;
    handleOutgoingChat();
  });
});

// Prevent default form submission and handle outgoing chat
typingForm.addEventListener("submit", (e) => {
  e.preventDefault(); 
  handleOutgoingChat();
});

loadDataFromLocalstorage();

Build A Google Gemini Chatbot with HTML CSS and JavaScript

How to start

Styles.css File

Script.js file

Bankygold7904

Leave a Comment Cancel Reply

Fully Functioning Contact Us Form in PHP

How to Get User Location in JavaScript (Source Code)

Build A Currency Converter App with JavaScript

Typing Speed Test Game Source Code

Toast Notification with Progress Bar in HTML CSS & JavaScript

Social Media Chat Application Template

Build an AI Chatbot in React JS &...

How to customize Django Jazzmine Admin

Build A Quiz App with Timer in HTML...

Responsive Login form in React Js and CSS

How to start

Styles.css File

Script.js file

Related posts

Leave a Comment Cancel Reply