122 lines
2.9 KiB
JavaScript
122 lines
2.9 KiB
JavaScript
import React from 'react';
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import ReactDOM from 'react-dom';
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import './index.css';
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function Square(props){
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return (
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<button className="square" onClick={props.clickfunc}>
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{props.value}
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</button>
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);
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}
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class Board extends React.Component {
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constructor(props){
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super(props);
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this.state = {
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squares : Array(9).fill(null)
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,xIsNext: true
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}
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};
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handleClick(i) {
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const squares = this.state.squares.slice();
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if (calculateWinner(squares) || squares[i]) {
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return;
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}
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squares[i] = this.state.xIsNext ? 'X' : 'O';
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this.setState(
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{
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squares: squares,
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xIsNext: !this.state.xIsNext
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}
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);
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}
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renderSquare(i) {
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return (
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//all the stuff passed here are 'props', could be anything
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//we have an object and a function reference
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<Square
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value={this.state.squares[i]}
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//cannot pass the name of the function directly, but only a named refernce
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clickfunc={() => this.handleClick(i)}
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/>
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);
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//return <Square value={i} />;
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}
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render() {
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const winner = calculateWinner(this.state.squares);
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let status;
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if (winner) {
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status = 'Winner: ' + winner;
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} else {
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status = 'Next Player: ' + (this.state.xIsNext ? 'X' : 'O')
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}
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return (
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<div>
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<div className="status">{status}</div>
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<div className="board-row">
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{this.renderSquare(0)}
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{this.renderSquare(1)}
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{this.renderSquare(2)}
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</div>
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<div className="board-row">
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{this.renderSquare(3)}
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{this.renderSquare(4)}
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{this.renderSquare(5)}
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</div>
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<div className="board-row">
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{this.renderSquare(6)}
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{this.renderSquare(7)}
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{this.renderSquare(8)}
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</div>
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</div>
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);
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}
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}
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class Game extends React.Component {
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render() {
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return (
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<div className="game">
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<div className="game-board">
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<Board />
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</div>
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<div className="game-info">
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<div>{/* status */}</div>
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<ol>{/* TODO */}</ol>
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</div>
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</div>
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);
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}
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}
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// ========================================
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ReactDOM.render(
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<Game />,
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document.getElementById('root')
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);
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function calculateWinner(squares) {
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const lines = [
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[0, 1, 2],
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[3, 4, 5],
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[6, 7, 8],
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[0, 3, 6],
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[1, 4, 7],
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[2, 5, 8],
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[0, 4, 8],
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[2, 4, 6],
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];
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for (let i = 0; i < lines.length; i++) {
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const [a, b, c] = lines[i];
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if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
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return squares[a];
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}
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}
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return null;
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} |