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AI_Tictactoe.html
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AI_Tictactoe.html
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<!DOCTYPE html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<title>
Tic-Tac-Toe (Hard)
</title>
<style type="text/css">
table {
border: 1px solid black;
border-spacing: 10px;
border-collapse: collapse;
}
button {
width: 50px;
height: 50px;
background: #fff;
border: 1px solid #000;
cursor: pointer;
margin: 0px;
}
td {
margin: 0px;
padding: 0px;
}
div {
text-align: center;
}
.wrapper,
table {
margin: 20px auto;
}
#winner {
margin: 20px auto;
font-size: 24px;
}
input[type=submit] {
background: #F5F5F5;
border: 1px solid #000;
cursor: pointer;
margin: 10px auto;
font-size: 20px;
}
</style>
<script type="text/javascript">
var board = [
[null, null, null],
[null, null, null],
[null, null, null]
]
var myMove = false;
if (myMove) {
makeMove();
}
function restartGame() {
board = [
[null, null, null],
[null, null, null],
[null, null, null]
];
myMove = false;
updateMove();
}
$(document).ready(function() {
$("button").click(function() {
var cell = $(this).attr("id")
var row = parseInt(cell[1])
var col = parseInt(cell[2])
if (board[row][col] == null){
if (!myMove) {
board[row][col] = false;
myMove = true;
updateMove();
makeMove();
}
}
});
});
function updateMove() {
updateButtons();
var winner = getWinner(board);
$("#winner").text(winner == 1 ? "Computer Won!" : winner == 0 ? "You Won!" : winner == -1 ? "Tie!" : "");
if (winner == 1 || winner == 0 || winner == -1) {
$("button").prop("disabled", true);
$("#move").hide();
$("#restart").show();
} else {
$("button").prop("disabled", false);
$("#move").show();
$("#restart").hide();
$("#move").text(myMove ? "Computer's Move" : "Your move");
}
}
function getWinner(board) {
// Check if someone won
vals = [true, false];
var allNotNull = true;
for (var k = 0; k < vals.length; k++) {
var value = vals[k];
// Check rows, columns, and diagonals
var diagonalComplete1 = true;
var diagonalComplete2 = true;
for (var i = 0; i < 3; i++) {
if (board[i][i] != value) {
diagonalComplete1 = false;
}
if (board[2 - i][i] != value) {
diagonalComplete2 = false;
}
var rowComplete = true;
var colComplete = true;
for (var j = 0; j < 3; j++) {
if (board[i][j] != value) {
rowComplete = false;
}
if (board[j][i] != value) {
colComplete = false;
}
if (board[i][j] == null) {
allNotNull = false;
}
}
if (rowComplete || colComplete) {
return value ? 1 : 0;
}
}
if (diagonalComplete1 || diagonalComplete2) {
return value ? 1 : 0;
}
}
if (allNotNull) {
return -1;
}
return null;
}
function updateButtons() {
for (var i = 0; i < 3; i++) {
for (var j = 0; j < 3; j++) {
$("#c" + i + "" + j).text(board[i][j] == false ? "X" : board[i][j] == true ? "O" : "");
}
}
}
function makeMove() {
board = minimaxMove(board);
console.log(numNodes);
myMove = false;
updateMove();
}
function minimaxMove(board) {
numNodes = 0;
return recurseMinimax(board, true)[1];
}
var numNodes = 0;
function recurseMinimax(board, player) {
numNodes++;
var winner = getWinner(board);
if (winner != null) {
switch (winner) {
case 1:
// AI wins
return [1, board]
case 0:
// opponent wins
return [-1, board]
case -1:
// Tie
return [0, board];
}
} else {
// Next states
var nextVal = null;
var nextBoard = null;
for (var i = 0; i < 3; i++) {
for (var j = 0; j < 3; j++) {
if (board[i][j] == null) {
board[i][j] = player;
var value = recurseMinimax(board, !player)[0];
if ((player && (nextVal == null || value > nextVal)) || (!player && (nextVal == null || value < nextVal))) {
nextBoard = board.map(function(arr) {
return arr.slice();
});
nextVal = value;
}
board[i][j] = null;
}
}
}
return [nextVal, nextBoard];
}
}
updateMove();
</script>
</head>
<body>
<div class="wrapper">
Click a cell when it's your move.<br><br>
<div id="move">Your Move</div>
<table summary="tic tac toe game">
<tr>
<td><button style="background-color:#eded63;font-size: 24px;" id="c00"></button></td>
<td><button style="background-color:yellowGreen;font-size: 24px;" id="c01"></button></td>
<td><button style="background-color:#eded63;font-size: 24px;" id="c02"></button></td>
</tr>
<tr>
<td><button style="background-color:yellowGreen;font-size: 24px;" id="c10"></button></td>
<td><button style="background-color:#eded63;font-size: 24px;" id="c11"></button></td>
<td><button style="background-color:yellowGreen;font-size: 24px;" id="c12"></button></td>
</tr>
<tr>
<td><button style="background-color:#eded63;font-size: 24px;" id="c20"></button></td>
<td><button style="background-color:yellowGreen;font-size: 24px;" id="c21"></button></td>
<td><button style="background-color:#eded63;font-size: 24px;" id="c22"></button></td>
</tr>
</table>
<input id="restart" type="submit" onclick="restartGame()" value="Play Again!" style="display: none;" />
<div id="winner"></div>
</div>
<br/><br/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/iframe-resizer/3.5.14/iframeResizer.contentWindow.min.js"></script>
</body>
</html>