Tic-Tac-Toe game in JavaScript

Today, we will learn how to develop a tic-tac-toe game in JavaScript. We will be using HTML for the front end and CSS for designing. Tic Tac Toe is a very famous game that we all play during our childhood. Rules are also very simple. Two players play at a time, they are given 9 boxes and they need to choose 1 box at a time. The player of chooses 3 straight boxes or 3 diagonal boxes wins the game.
Let’s check what we are going to develop.
Output of Tic-Tac-Toe game in JavaScript:

Code for the Tic-Tac-Toe game in JavaScript:

<html>

    <link href='https://fonts.googleapis.com/css?family=Montserrat' rel='stylesheet'>


  <div class="gameArea gameAreaHide">
    <div class="title">
      Tic-Tac-Toe
    </div>

    <div class="resultField">
      <div>
        <span id="playerDisplay" class="playerDisplayOne">
          Player <span class="displayXO">X</span>
        </span>
        <span class="playerOne"></span>
        <span class="resultPlayerOne">0</span>
      </div>
      <div>
        <span id="playerDisplay" class="playerDisplayTwo">
          Player <span class="displayXO">O</span>
        </span>
        <span class="playerTwo"></span>
        <span class="resultPlayerTwo">0</span>
      </div>
    </div>

    <div class="messageField">
      <div class="messageFieldInner"></div>
    </div>
    <div class="playField">
      <button id="one" class="firstRow firstColumn diagonalDown"></button>
      <button id="two" class="firstRow secondColumn"></button>
      <button id="three" class="firstRow thirdColumn diagonalUp"></button>
      <button id="four" class="secondRow firstColumn"></button>
      <button id="five" class="secondRow secondColumn diagonalDown diagonalUp"></button>
      <button id="six" class="secondRow thirdColumn"></button>
      <button id="seven" class="thirdRow firstColumn diagonalUp"></button>
      <button id="eight" class="thirdRow secondColumn"></button>
      <button id="nine" class="thirdRow thirdColumn diagonalDown"></button>
    </div>

    <div class="winnerWindow">
      <span class="winner">WINNER</span>
      <span class="winnerName">Name Of Winner</span>
      <button class="playAgain">Play Again</button>
      <button class="resetGame">Reset Game</button>
    </div>
  </div>

  <!-- player  names -->
  <div class="playerNames">
    <div class="title">
      Tic-Tac-Toe
    </div>

    <form action="/tic-tac-toe">
      <div>
        <label for="playerX">Player1 Name:</label>
        <input type="text" name="" id="playerX" autofocus>
      </div>
      <div>
        <label for="playerO">Player2 Name:</label>
        <input type="text" name="" id="playerO">
      </div>
      <button>
       Let's Start The Game!!
      </button>
    </form>
  </div>
  <style>
  * {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: 'Montserrat';
  font-weight: 500;
}

*::selection {
  user-select: none;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background-color: rgb(207, 224, 232);
  cursor: default;
}

button {
  cursor: pointer;
  background-color: rgb(207, 224, 232);
  font-weight: 600;
  border: none;
  box-shadow: 2px 3px 8px rgba(0, 0, 0, 0.61);
}


.spanXO {
  font-family: 'Montserrat';
  font-size: 30px;
  font-weight: 400;
}


.title {
  width: 100%;
  height: 10%;
  letter-spacing: 3px;
  text-align: center;
  padding-top: 5px;
  font-size: 36px;
  color: white
}


.playerNames {
  width: 400px;
  height: 500px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  background-color: rgb(0,0,0);
  border: 2px solid rgb(255,255,255);
}

.playerNamesHide {
  display: none;
}

form {
  width: 100%;
  height: 90%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

label {
  display: block;
  font-size: 25px;
  letter-spacing: 1px;
  color: white;
}

form div {
  width: 60%;
  height: 120px;
}

input {
  font-size: 25px;
  color: white;
  padding: 1px 5px;
  letter-spacing: 3px;
  width: 100%;
  background-color: transparent;
  border: none;
  border-bottom: 2px solid rgb(255, 255, 255);
  outline: none;
}

form button {
  width: 55%;
  font-size: 20px;
  letter-spacing: 1px;
  padding: 7px 20px;
}


.gameArea {
  width: 400px;
  height: 650px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  background-color: rgb(0,0,0);
  border: 2px solid rgb(255,255,255);
}

.gameAreaHide {
  display: none;
}



.resultField {
  width: 100%;
  height: 20%;
  padding: 0px 5px;
  display: flex;
  align-items: center;
  justify-content: space-around;
}

.resultField div {
  width: 48%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: rgb(255,255,255);
  border: 2px solid rgb(0,0,0);
  color: rgb(32, 39, 58);
}

#playerDisplay {
  font-size: 16px;
  letter-spacing: 1px;
  border-bottom: 1px solid rgb(0,0,0);
  height: 16%;
}

.displayXO {
  font-family: 'Montserrat';
  font-size: 18px;
}

.playerDisplayHide {
  display: none;
}

.playerOne, .playerTwo {
  height: 28%;
  font-size: 26px;
  font-weight: 800;
  max-width: 98%;
  overflow: hidden;
}

.resultPlayerOne, .resultPlayerTwo {
  font-size: 44px;
  height: 55%;
}



.messageField {
  width: 100%;
  height: 10%;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  font-size: 22px;
  letter-spacing: 1px;
  color: white;
}

.messageField div {
  display: flex;
  align-items: baseline;
}



.playField {
  width: 100%;
  height: 60%;
  padding: 0 5px 5px 5px;
  display: flex;
  flex-wrap: wrap;
  align-content: flex-end;
  justify-content: center;
}

.playFieldHide {
  display: none;
}


.playField button {
  width: 33%;
  height: 33%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Montserrat';
  font-size: 110px;
  font-weight: 400;
  text-shadow: 1px 3px 7px rgba(0, 0, 0, 0.534);
  transition: all 0.7s ease-in;
}

.firstColumn, .secondColumn, .thirdColumn {
  background-color: rgb(0,0,0);
  border: 2px solid rgb(255,255,255);
  box-shadow: 0px 2px 10px rgb(102, 114, 146);
  color: rgb(255,255,255);

}

.firstColumn, .secondColumn {
  border-right: none;
}

.firstRow, .secondRow {
  border-bottom: none;
}


.bleepWinner {
  color: black;
  background-color: rgb(255,255,255);
}


.winnerWindow {
  display: none;
}

.winnerWindowShow {
  width: 100%;
  height: 60%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  padding-bottom: 25px;
}

.winner {
  font-size: 65px;
  font-family: 'Montserrat';
  font-weight: 400;
  letter-spacing: 10px;
  color: white
}

.winnerName {
  font-size: 40px;
  padding-bottom: 35px;
  color: white;
  max-width: 90%;
  overflow: hidden;
}

.playAgain {
  width: 70%;
  height: 50px;
  font-size: 27px;
  letter-spacing: 2px;
}

.resetGame {
  width: 50%;
  height: 40px;
  font-size: 18px;
  letter-spacing: 1px;
}



@media (max-width: 402px) {

  .playerNames {
    width: 300px;
    height: 500px;
  }

  form div {
    width: 80%;
    height: 120px;
  }

  form button {
    width: 70%;
    letter-spacing: 1px;
    padding: 10px 5px;
  }

 
  .gameArea {
    width: 300px;
    height: 500px;
  }

  
  #playerDisplay {
    font-size: 16px;
    letter-spacing: 1px;
    border-bottom: none;
    height: 16%;
  }

  .playerOne, .playerTwo {
    font-size: 20px;
    letter-spacing: 1px;
  }

  .resultPlayerOne, .resultPlayerTwo {
    font-size: 26px;
  }

  

  .messageField, .takenMessageDiv {
    font-size: 20px;
  }

 

  .playField {
    padding: 0 5px 5px 5px;
  }

  .playField button {
    font-size: 90px;
  }

 


  .winner {
    font-size: 55px;
    font-weight: 200;
    letter-spacing: 8px;
  }

  .winnerName {
    font-size: 50px;
    font-weight: 400;
    letter-spacing: 7px;
    padding-bottom: 20px;
  }
}

@media (max-width: 302px) {

  .spanXO {
    font-family: 'Montserrat';
    font-size: 26px;
    font-weight: 400;
  }

  .title {
    padding-top: 3px;
    font-size: 26px;
  }

  
  .playerNames {
    width: 220px;
    height: 350px;
  }

  form div {
    width: 85%;
    height: 100px;
  }

  label {
    font-size: 20px;
  }

  form button {
    width: 80%;
    letter-spacing: 0px;
    padding: 8px 5px;
    font-size: 18px;
  }

  
  .gameArea {
    width: 220px;
    height: 350px;
  }

  
  .divPlayeOne, .divPlayeTwo {
    border: 2px solid rgb(255,255,255);
  }

  #playerDIsplay {
    font-size: 12px;
    letter-spacing: 1px;
    height: 20%;
  }

  .playerOne, .playerTwo {
    font-size: 18px;
    letter-spacing: 0px;
    height: 30%;
  }

  .resultPlayerOne, .resultPlayerTwo {
    font-size: 20px;
    height: 50%;
  }



  .messageField, .takenMessageDiv {
    font-size: 16px;
  }

  #playerDisplay {
    font-size: 12px;
  }

  .displayXO {
    font-size: 10px;
  }



  .playField {
    padding: 0 3px 3px 3px;
  }

  .playField button {
    font-size: 65px;
  }


  .winnerWindow {
    padding-bottom: 2px;
  }

  .winner {
    font-size: 45px;
    font-weight: 200;
    letter-spacing: 1px;
  }

  .winnerName {
    font-size: 35px;
    font-weight: 400;
    letter-spacing: 1px;
    padding-bottom: 10px;
  }

  .playAgain {
    width: 70%;
    height: 40px;
    font-size: 20px;
    letter-spacing: 1px;
    padding: 5px, 8px;
  }

  .resetGame {
    width: 50%;
    height: 30px;
    font-size: 16px;
    letter-spacing: 0px;
    padding: 10px, 15px;
  }


}
  </style>
  <script>
  const gameBoard = document.querySelectorAll('.playField button');
const messageField = document.querySelector('.messageField div');
const playField = document.querySelector('.playField');
const winnerWindow = document.querySelector('.winnerWindow');
let drawCount = 0;
const arrMoves = [[], [], []];

let playerX; 
rollDice();

// to decide who is going to play first
function rollDice() {
  let num = Math.floor(Math.random() * 20);
  if (num % 2 === 0) {
    playerX = true;
    messageField.innerHTML = "Player <span class='spanXO'>X</span> starts";
  }
  else {
    playerX = false
    messageField.innerHTML = "Player <span class='spanXO'>O</span> starts";
  }
}

// information about players
function playerNames(eventObject) {
  eventObject.preventDefault();

  //showing or diplaying their names on the screen
  const playerOne = document.querySelector('.playerOne');
  const playerTwo = document.querySelector('.playerTwo');
  //choosing input text to catch players names
  const namePlayerX = document.querySelector('#playerX');
  const namePlayerO = document.querySelector('#playerO');

  //displaying player names 
  if (namePlayerX.value === '') {
    const playerDisplayX = document.querySelector('.playerDisplayOne');
    playerDisplayX.classList.add('playerDisplayHide');
    playerOne.innerText = 'Player X';
  }
  else
    playerOne.innerText = namePlayerX.value;

  if (namePlayerO.value === '') {
    const playerDisplayX = document.querySelector('.playerDisplayTwo');
    playerDisplayX.classList.add('playerDisplayHide');
    playerTwo.innerText = 'Player O';
  }
  else
    playerTwo.innerText = namePlayerO.value;

  //stopping playerNames window
  const playerNames = document.querySelector('.playerNames');
  playerNames.classList.add('playerNamesHide');

  namePlayerX.value = ''; //clearing name input
  namePlayerO.value = '';

  //starting gameArea window
  const gameArea = document.querySelector('.gameArea');
  gameArea.classList.remove('gameAreaHide');
}


function game() {

 
  if (this.innerText) {
    if (playerX)
      messageField.innerHTML = "Spot taken. Player: <span class='spanXO'>X</span>";
    else
      messageField.innerHTML = "Spot taken. Player: <span class='spanXO'>O</span>";
  }
  else {
    
    const checkForWinner = (move) => {
      let isWinner = checkWinner(move);
      if (isWinner) {
        for (let btn of gameBoard) {
          btn.disabled = true;
        }
        displayWinning(move);
      }
      else if (drawCount === 9)
        displayDraw();
    }
    
    if (playerX) {
      messageField.innerHTML = "Player: <span class='spanXO'>O</span>";
      this.innerText = 'X';
      playerX = false;
      fillArray(this.id, this.innerText);
      drawCount++;
      checkForWinner(this.innerText);
    }
    
    else {
      messageField.innerHTML = "Player: <span class='spanXO'>X</span>";
      this.innerText = 'O';
      playerX = true;
      fillArray(this.id, this.innerText);
      drawCount++;
      checkForWinner(this.innerText);
    }
  }
}


function fillArray(id, move) {
  switch (id) {
    case 'one':
      arrMoves[0][0] = move;
      break;
    case 'two':
      arrMoves[0][1] = move;
      break;
    case 'three':
      arrMoves[0][2] = move;
      break;
    case 'four':
      arrMoves[1][0] = move;
      break;
    case 'five':
      arrMoves[1][1] = move;
      break;
    case 'six':
      arrMoves[1][2] = move;
      break;
    case 'seven':
      arrMoves[2][0] = move;
      break;
    case 'eight':
      arrMoves[2][1] = move;
      break;
    case 'nine':
      arrMoves[2][2] = move;
      break;
  }
}


const blinkWinningField = function (direction, place) {

  const addBleepWinner = (divArray) => {
    for (let item of divArray) {
      item.classList.add('bleepWinner');
    }
  }

  if (direction === 'r') {
    switch (place) {
      case 0:
        const rowDivsOne = document.querySelectorAll('.firstRow');
        addBleepWinner(rowDivsOne);
        break;
      case 1:
        const rowDivsTwo = document.querySelectorAll('.secondRow');
        addBleepWinner(rowDivsTwo);
        break;
      case 2:
        const rowDivsThree = document.querySelectorAll('.thirdRow');
        addBleepWinner(rowDivsThree);
        break;
    }
  }
  else if (direction === 'c') {
    switch (place) {
      case 0:
        const colDivsOne = document.querySelectorAll('.firstColumn');
        addBleepWinner(colDivsOne);
        break;
      case 1:
        const colDivsTwo = document.querySelectorAll('.secondColumn');
        addBleepWinner(colDivsTwo);
        break;
      case 2:
        const colDivsThree = document.querySelectorAll('.thirdColumn');
        addBleepWinner(colDivsThree);
        break;
    }
  }
  else if (direction === 'ddown') {
    const dDownDivs = document.querySelectorAll('.diagonalDown');
    addBleepWinner(dDownDivs);
  }
  else { 
    const dUpDivs = document.querySelectorAll('.diagonalUp');
    addBleepWinner(dUpDivs);
  }
}

function checkWinner(move) {

  
  for (let r = 0; r < 3; r++) {
    if (arrMoves[r][0] === move && arrMoves[r][1] === move && arrMoves[r][2] === move) {
      scoreTracker(move);
      blinkWinningField('r', r);
      return true;
    }
  }
 
  for (let c = 0; c < 3; c++) {
    if (arrMoves[0][c] === move && arrMoves[1][c] === move && arrMoves[2][c] === move) {
      scoreTracker(move);
      blinkWinningField('c', c);
      return true;
    }
  }
  
  if (arrMoves[0][0] === move && arrMoves[1][1] === move && arrMoves[2][2] === move) {
    scoreTracker(move);
    blinkWinningField('ddown', null);
    return true;
  }
  
  if (arrMoves[0][2] === move && arrMoves[1][1] === move && arrMoves[2][0] === move) {
    scoreTracker(move);
    blinkWinningField('dup', null);
    return true;
  }
  return false;
}


function displayWinning(winner) {
  setTimeout(() => {
    const winnerWindow = document.querySelector('.winnerWindow');
    const winnerName = document.querySelector('.winnerName');
    const playerX = document.querySelector('.playerOne');
    const playerO = document.querySelector('.playerTwo');

    if (winner === 'X')
      winnerName.innerText = playerX.innerText;
    else
      winnerName.innerText = playerO.innerText;

    playField.classList.add('playFieldHide');
    messageField.innerText = '';
    winnerWindow.classList.add('winnerWindowShow');
  }, 1500);
}


function displayDraw() {
  const winner = document.querySelector('.winner');
  const winnerName = document.querySelector('.winnerName');

  playField.classList.add('playFieldHide');
  messageField.innerText = '';
  winnerWindow.classList.add('winnerWindowShow');
  winner.innerText = 'DRAW'
  winnerName.innerText = ' ';
}


function scoreTracker(move) {
  const playerX = document.querySelector('.resultPlayerOne');
  const playerO = document.querySelector('.resultPlayerTwo');

  if (move === 'X')
    playerX.innerText++;
  else
    playerO.innerText++;
}


function resetGameBoard() {

  rollDice();
  drawCount = 0; //start at zero again

  
  for (let r = 0; r < 3; r++) {
    for (let c = 0; c < 3; c++) {
      arrMoves[r][c] = '';
    }
  }
  
  for (let btn of gameBoard) {
    btn.innerText = '';
    btn.classList.remove('bleepWinner');
    btn.disabled = false;
  }

  const winner = document.querySelector('.winner');
  winner.innerText = 'WINNER';

  playField.classList.remove('playFieldHide');
  winnerWindow.classList.remove('winnerWindowShow');
}


function resetScoreTracker() {
  const playerX = document.querySelector('.resultPlayerOne');
  const playerO = document.querySelector('.resultPlayerTwo');

  playerX.innerText = 0;
  playerO.innerText = 0;
}



const form = document.querySelector('form');
form.addEventListener('submit', playerNames);


for (let btn of gameBoard) {
  btn.addEventListener('click', game);
}


const resetGameButton = document.querySelector('.resetGame');
resetGameButton.addEventListener('click', () => {
  resetGameBoard();
  resetScoreTracker();
  
  const playerNames = document.querySelector('.playerNames');
  playerNames.classList.remove('playerNamesHide');
  
  const gameArea = document.querySelector('.gameArea');
  gameArea.classList.add('gameAreaHide');

  const playerDisplayX = document.querySelector('.playerDisplayOne');
  playerDisplayX.classList.remove('playerDisplayHide');
  const playerDisplayO = document.querySelector('.playerDisplayTwo');
  playerDisplayO.classList.remove('playerDisplayHide');
})


const playAgainButton = document.querySelector('.playAgain');
playAgainButton.addEventListener('click', resetGameBoard)

  </script>
</html>