Created
October 8, 2017 09:34
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The tictactoe tutorial from: https://reactjs.org/tutorial/tutorial.html
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| body { | |
| font: 14px "Century Gothic", Futura, sans-serif; | |
| margin: 20px; | |
| } | |
| 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: 24px; | |
| font-weight: bold; | |
| line-height: 34px; | |
| height: 34px; | |
| margin-right: -1px; | |
| margin-top: -1px; | |
| padding: 0; | |
| text-align: center; | |
| width: 34px; | |
| } | |
| .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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| <html> | |
| <head> | |
| <script src="scripts/react.min.js"></script> | |
| <script src="scripts/react-dom.min.js"></script> | |
| <link rel="stylesheet" type="text/css" href="css/index.css"> | |
| </head> | |
| <body> | |
| <div id="root"></div> | |
| <script src="tictactoe.js"></script> | |
| </body> | |
| </html> |
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| function Square(props) { | |
| return ( | |
| <button className="square" onClick={props.onClick}> | |
| {props.value} | |
| </button> | |
| ); | |
| } | |
| class Board extends React.Component { | |
| renderSquare(i) { | |
| return ( | |
| <Square | |
| value={this.props.squares[i]} | |
| onClick={() => this.props.onClick(i)} | |
| /> | |
| ); | |
| } | |
| render() { | |
| return ( | |
| <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 { | |
| constructor() { | |
| super(); | |
| this.state = { | |
| history: [{ | |
| squares: Array(9).fill(null) | |
| }], | |
| stepNumber: 0, | |
| xIsNext: true, | |
| }; | |
| } | |
| handleClick(i) { | |
| const history = this.state.history.slice(0, this.state.stepNumber + 1); | |
| const current = history[history.length - 1]; | |
| const squares = current.squares.slice(); | |
| if (calculateWinner(squares) || squares[i]) { | |
| return; | |
| } | |
| squares[i] = this.state.xIsNext ? 'X' : 'O'; | |
| this.setState({ | |
| history: history.concat([{ | |
| squares: squares | |
| }]), | |
| stepNumber: history.length, | |
| xIsNext: !this.state.xIsNext, | |
| }); | |
| } | |
| jumpTo(step) { | |
| this.setState({ | |
| stepNumber: step, | |
| xIsNext: (step % 2) === 0, | |
| }) | |
| } | |
| render() { | |
| const history = this.state.history; | |
| const current = history[this.state.stepNumber]; | |
| const winner = calculateWinner(current.squares); | |
| const moves = history.map((step,move) =>{ | |
| const desc = move ? | |
| 'Go to move #' + move : | |
| 'Go to game start'; | |
| return ( | |
| <li key={move}> | |
| <button onClick={() => this.jumpTo(move)}>{desc}</button> | |
| </li> | |
| ); | |
| }); | |
| let status; | |
| if (winner) { | |
| status = 'Winner: ' + winner; | |
| } else { | |
| status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O'); | |
| } | |
| return ( | |
| <div className="game"> | |
| <div className="game-board"> | |
| <Board | |
| squares={current.squares} | |
| onClick={(i) => this.handleClick(i)} | |
| /> | |
| </div> | |
| <div className="game-info"> | |
| <div>{status}</div> | |
| <ol>{moves}</ol> | |
| </div> | |
| </div> | |
| ); | |
| } | |
| } | |
| // ======================================== | |
| ReactDOM.render( | |
| <Game />, | |
| document.getElementById('root') | |
| ); | |
| 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]; | |
| } | |
| } | |
| return null; | |
| } |
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