JS Chatbot

index.html

<div id="container" class="container">
  <img src="https://cdn.pixabay.com/photo/2020/01/02/16/38/chatbot-4736275_960_720.png" height="400vh" alt="Chatbot clipart">
   <div id="chat" class="chat">
    <div id="messages" class="messages"></div>
    <input id="input" type="text" placeholder="Write something..." autocomplete="off" autofocus="true" />
  </div>
</div>

js-chatbot.markdown

JS Chatbot

A Pen by user01 on CodePen.

License.

script.babel

const inputField = document.getElementById("input");
inputField.addEventListener("keydown", (e) => {
  if (e.code === "Enter") {
    let input = inputField.value;
    inputField.value = "";
    output(input);
  }
});

function output(input) {
  let product;
  let text = input.toLowerCase().replace(/[^\w\s\d]/gi, "");
  text = text
    .replace(/ a /g, " ")
    .replace(/whats/g, "what is")
    .replace(/please /g, "")
    .replace(/ please/g, "")
    .replace(/r u/g, "are you");

  if (compare(utterances, answers, text)) {
    // Search for exact match in triggers
    product = compare(utterances, answers, text);
  } 
  else {
    product = alternatives[Math.floor(Math.random() * alternatives.length)];
  }

  addChatEntry(input, product);
}

function compare(utterancesArray, answersArray, string) {
  let reply;
  let replyFound = false;
  for (let x = 0; x < utterancesArray.length; x++) {
    for (let y = 0; y < utterancesArray[x].length; y++) {
      if (utterancesArray[x][y] === string) {
        let replies = answersArray[x];
        reply = replies[Math.floor(Math.random() * replies.length)];
        replyFound = true;
        break;
      }
    }
    if (replyFound) {
      break;
    }
  }
  return reply;
}

function addChatEntry(input, product) {
  const messagesContainer = document.getElementById("messages");
  let userDiv = document.createElement("div");
  userDiv.id = "user";
  userDiv.className = "user response";
  userDiv.innerHTML = `<span>${input}</span>`;
  messagesContainer.appendChild(userDiv);

  let botDiv = document.createElement("div");
  let botText = document.createElement("span");
  botDiv.id = "bot";
  botDiv.className = "bot response";
  botText.innerText = "Typing...";
  botDiv.appendChild(botText);
  messagesContainer.appendChild(botDiv);

  messagesContainer.scrollTop =
    messagesContainer.scrollHeight - messagesContainer.clientHeight;

  setTimeout(() => {
    botText.innerText = `${product}`;
  }, 2000);
}

scripts

<script src="https://codepen.io/tariq01/pen/yLVMQdw.js"></script>

style.css

* {
  box-sizing: border-box;
}

html {
	height: 100%;

}

body {
  font-family: 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', Arial, Helvetica,
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
	background-color: silver;
	height: 100%;
	margin: 0;
}

span {
	padding-right: 15px;
	padding-left: 15px;
}

.container {
	display: flex;
  justify-content: center;
	align-items: center;
	width: 100%;
	height: 100%;
}

.chat {
	height: 300px;
	width: 50vw;
	display: flex;
	flex-direction: column;
  justify-content: center;
	align-items: center;
} 

::-webkit-input-placeholder { 
	color: .711 
}
 
input { 
	border: 0; 
	padding: 15px; 
	margin-left: auto;
	border-radius: 10px; 
}

.messages {
	display: flex;
	flex-direction: column;
	overflow: scroll;
	height: 90%;
	width: 100%;
	background-color: white;
	padding: 15px;
	margin: 15px;
	border-radius: 10px;
}

#bot {
	margin-right: auto;
}

#user {
	margin-left: auto;
}


.bot {
	font-family: Consolas, 'Courier New', Menlo, source-code-pro, Monaco,  
	monospace;
}

.avatar {
	height: 25px;
}

.response {
	display: flex;
	align-items: center;
	margin: 1%;
}


/* Mobile */

@media only screen and (max-width: 980px) {
  .container {
		flex-direction: column; 
		justify-content: flex-start;
	}
	.chat {
		width: 75vw;
		margin: 10vw;
	}
}