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pull request #21

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rzhang44 Jun 24, 2022
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rzhang44 Jun 25, 2022
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rzhang44 Jun 27, 2022
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rzhang44 Jul 7, 2022
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21 changes: 21 additions & 0 deletions kyros homework.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
</head>

<body>
<button id="btn">Button</button>

<script src="index.js"></script>
</body>
</html>

<script>
const btn = document.getElementById('btn');

btn.addEventListener('click', function onClick(event) {
document.body.style.backgroundColor = 'red';
});

</script>
146 changes: 146 additions & 0 deletions kyros.jsx
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Original file line number Diff line number Diff line change
@@ -0,0 +1,146 @@
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(props) {
super(props);
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>
);
}
}

// ========================================

const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(<Game />);

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;
}