Created
October 11, 2019 02:13
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Tic Tac Toe
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<div id="errors" style=" | |
background: #c00; | |
color: #fff; | |
display: none; | |
margin: -20px -20px 20px; | |
padding: 20px; | |
white-space: pre-wrap; | |
"></div> | |
<div id="root"></div> | |
<script> | |
window.addEventListener('mousedown', function(e) { | |
document.body.classList.add('mouse-navigation'); | |
document.body.classList.remove('kbd-navigation'); | |
}); | |
window.addEventListener('keydown', function(e) { | |
if (e.keyCode === 9) { | |
document.body.classList.add('kbd-navigation'); | |
document.body.classList.remove('mouse-navigation'); | |
} | |
}); | |
window.addEventListener('click', function(e) { | |
if (e.target.tagName === 'A' && e.target.getAttribute('href') === '#') { | |
e.preventDefault(); | |
} | |
}); | |
window.onerror = function(message, source, line, col, error) { | |
var text = error ? error.stack || error : message + ' (at ' + source + ':' + line + ':' + col + ')'; | |
errors.textContent += text + '\n'; | |
errors.style.display = ''; | |
}; | |
console.error = (function(old) { | |
return function error() { | |
errors.textContent += Array.prototype.slice.call(arguments).join(' ') + '\n'; | |
errors.style.display = ''; | |
old.apply(this, arguments); | |
} | |
})(console.error); | |
</script> |
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function Square(props) { | |
return ( | |
<button className="square" onClick={ props.onClick }> | |
{props.value} | |
</button> | |
); | |
} | |
class Board extends React.Component { | |
constructor(props){ | |
super(props) | |
this.state = { | |
squares: Array(9).fill(null), | |
xIsNext: true, | |
} | |
} | |
handleClick(i) { | |
const squares = this.state.squares.slice(); | |
let winnerInfo = calculateWinner(squares); | |
if (winnerInfo[0] || squares[i]) { | |
return; | |
} | |
squares[i] = this.state.xIsNext ? 'X' : 'O'; | |
this.setState({ | |
squares: squares, | |
xIsNext: !this.state.xIsNext, | |
}); | |
} | |
renderSquare(i) { | |
return <Square | |
value={this.state.squares[i]} | |
onClick={() => this.handleClick(i)} | |
/>; | |
} | |
render() { | |
const winner = calculateWinner(this.state.squares); | |
let status; | |
if (winner) { | |
status = 'Winner: ' + winner; | |
} else { | |
status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O'); | |
} | |
return ( | |
<div> | |
<div className="status">{status}</div> | |
<div className="board-row"> | |
{this.renderSquare(0)} | |
{this.renderSquare(1)} | |
{this.renderSquare(2)} | |
</div> | |
<div className="board-row"> | |
{this.renderSquare(3)} | |
{this.renderSquare(4)} | |
{this.renderSquare(5)} | |
</div> | |
<div className="board-row"> | |
{this.renderSquare(6)} | |
{this.renderSquare(7)} | |
{this.renderSquare(8)} | |
</div> | |
</div> | |
); | |
} | |
} | |
class Game extends React.Component { | |
render() { | |
return ( | |
<div className="game"> | |
<div className="game-board"> | |
<Board /> | |
</div> | |
<div className="game-info"> | |
<div>{/* status */}</div> | |
<ol>{/* TODO */}</ol> | |
</div> | |
</div> | |
); | |
} | |
} | |
function calculateWinner(squares) { | |
const lines = [ | |
[0, 1, 2], | |
[3, 4, 5], | |
[6, 7, 8], | |
[0, 3, 6], | |
[1, 4, 7], | |
[2, 5, 8], | |
[0, 4, 8], | |
[2, 4, 6], | |
]; | |
for (let i = 0; i < lines.length; i++) { | |
const [a, b, c] = lines[i]; | |
if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) { | |
return [squares[a], lines[i]]; | |
} | |
} | |
return null; | |
} | |
// ======================================== | |
ReactDOM.render( | |
<Game />, | |
document.getElementById('root') | |
); |
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<script src="https://unpkg.com/react@16/umd/react.development.js"></script> | |
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script> |
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body { | |
font: 104px "Century Gothic", Futura, sans-serif; | |
margin: 30px; | |
} | |
ol, ul { | |
padding-left: 30px; | |
} | |
.board-row:after { | |
clear: both; | |
content: ""; | |
display: table; | |
} | |
.status { | |
margin-bottom: 10px; | |
} | |
.square { | |
background: #fff; | |
border: 1px solid #999; | |
float: left; | |
font-size: 124px; | |
font-weight: bold; | |
line-height: 134px; | |
height: 134px; | |
margin-right: -1px; | |
margin-top: -1px; | |
padding: 0; | |
text-align: center; | |
width: 134px; | |
} | |
.square:focus { | |
outline: none; | |
} | |
.kbd-navigation .square:focus { | |
background: #ddd; | |
} | |
.game { | |
display: flex; | |
flex-direction: row; | |
} | |
.game-info { | |
margin-left: 20px; | |
} |
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