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Chessboard.html
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Chessboard.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Chessboard</title>
<style>
.container {
display: grid;
grid-template-columns: repeat(8, 40px);
border: 2px solid black;
border-radius: 0.3rem;
width: max-content;
padding: 2px;
}
.item {
height: 40px;
cursor: pointer;
}
.bg-white {
color: black;
background-color: white;
}
.bg-black {
color: white;
background-color: black;
}
.bg-red {
background-color: red !important;
}
</style>
</head>
<body>
<h1>Chessboard</h1>
<div id="container" class="container"></div>
<script>
function Chessbord(el, n) {
let container = document.querySelector(el);
let boardFragmentContainer = document.createDocumentFragment();
let lastIJObj = null;
for (let i = 0; i < n; i++) {
for (let j = 0; j < n; j++) {
let item = document.createElement("div");
item.classList.add("item");
if (isWhiteTile(i, j)) item.classList.add("bg-white");
else item.classList.add("bg-black");
item.dataset.i = i;
item.dataset.j = j;
// item.innerText = ${i} x ${j};
boardFragmentContainer.append(item);
}
}
container.appendChild(boardFragmentContainer);
function highlightTile(i, j) {
let index = getIndex(i, j);
container.children[index].classList.add("bg-red");
}
function resetTile(i, j) {
let index = getIndex(i, j);
if (isWhiteTile(i, j))
container.children[index].classList.add("bg-white");
else container.children[index].classList.add("bg-black");
container.children[index].classList.remove("bg-red");
}
function onContainerClick(e) {
let {
i,
j
} = e.target.dataset;
if (i !== undefined && j !== undefined) {
if (lastIJObj)
highlightDiagonalTiles(lastIJObj.i, lastIJObj.j, resetTile);
highlightDiagonalTiles(Number(i), Number(j), highlightTile);
lastIJObj = {
i: Number(i),
j: Number(j)
};
}
}
function isWhiteTile(i, j) {
return (i % 2 === 0 && j % 2 === 0) || (i % 2 !== 0 && j % 2 !== 0);
}
function getIndex(i, j) {
return i * n + j;
}
function highlightDiagonalTiles(i, j, cb = () => {}) {
let startI = i - j < 0 ? 0 : i - j;
let startJ = j - i < 0 ? 0 : j - i;
let index;
for (let l = startI, k = startJ; l < n; l++, k++) {
index = getIndex(l, k);
if (container.children[index] && l < 8 && k < 8) {
cb(l, k);
} else break;
}
startI = i + j < 8 ? 0 : i + j - 7;
startJ = i + j > 8 ? 7 : i + j;
for (let l = startI, k = startJ; l < n; l++, k--) {
index = getIndex(l, k);
if (container.children[index] && l < 8 && k >= 0) {
cb(l, k);
} else break;
}
}
container.addEventListener("click", onContainerClick);
}
new Chessbord("#container", 8);
</script>
</body>
</html>