Init

web/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  
+  <head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="style.css" />
+    <title>Lô tô (made by miti99)</title>
+  </head>
+  
+  <body onload="start()">
+    <h1>Lô tô</h1>
+    Tạo bảng chơi lô tô, lấy cảm hứng từ những buổi họp lớp thiếu giấy chơi lô tô của TN1 (2014-2017)
+    <a href="javascript:toggle('instructions');">Hướng dẫn</a>
+    
+    <noscript>
+      <div class="error">
+        <strong>Lỗi:</strong>
+        <p>
+          <em> JavaScript không được bật</em>
+        </p>
+      </div>
+    </noscript>
+    
+    <div id="instructions">
+      <h2>Hướng dẫn</h2>
+      <ul>
+        <noscript>
+          <li>Bật JavaScript</li>
+        </noscript>
+        <li>Nhấn <strong>Tạo</strong> để tạo bảng mới</li>
+      </ul>
+    </div>
+    
+    <form>
+      <input type="button" value="Tạo" onclick="generate();" />
+    </form>
+    
+    <h2>Bảng</h2>
+    <div id="grid"></div>
+    <script src="script.js"></script>
+  </body>
+  
+</html>

web/script.js

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+let numRows = 9;
+let numCols = 9;
+let numPerRow = 5;
+let lotoKey = "loto_";
+
+function randomNumbers(num, from, to) {
+  let arr = Array.from({
+    length: to - from
+  }, (_, i) => from + i);
+  arr.sort(() => 0.5 - Math.random());
+  return arr.slice(0, num).sort();
+}
+
+function generate() {
+  let node = document.getElementById("grid");
+  if (node.innerHTML && !confirm("Bạn có muốn tạo lại bảng không?"))
+    return;
+  
+  let cell = new Array(numRows).fill(0).map(() => new Array(numCols).fill(0));
+  let countNumPerCol = new Array(numCols).fill(0);
+  //Random cac cot co so trong tung dong
+  for (let i = 0; i < numRows; i++) {
+    let selectedCol = randomNumbers(numPerRow, 0, 9);
+    selectedCol.forEach(col => {
+      countNumPerCol[col] += 1;
+      cell[i][col] = -1;
+    });
+  }
+  
+  for (let i = 0; i < numCols; i++) {
+    let selectedNum = randomNumbers(countNumPerCol[i], 10 * i + 1, 10 * (i + 1) + 1);
+    for (let j = 0; j < numRows; j++) {
+      if (cell[j][i] == -1) {
+        cell[j][i] = selectedNum.shift();
+      }
+    }
+  }
+  
+  let html = '<table border="0">';
+  for (let i = 0; i < numRows; i++) {
+    html += "<tr>";
+    for (let j = 0; j < numCols; j++) {
+      let num = cell[i][j];
+      let isEnabled = num > 0;
+      html += `<td id="${i}_${j}" class="${isEnabled ? 'hightlight' : ''}" onClick="cellClicked('${i}_${j}')" style="text-align: center; pointer-events: ${isEnabled ? 'auto' : 'none'};">${isEnabled ? num : ""}</td>`;
+    }
+    html += "</tr >";
+  }
+  html += "</table>";
+  node.innerHTML = html;
+  save(lotoKey, html);
+  saveGameState();
+}
+
+function supports_html5_storage() {
+  try {
+    return "localStorage" in window && window["localStorage"] !== null;
+  } catch (e) {
+    return false;
+  }
+}
+
+function cellClicked(id) {
+  let elem = document.getElementById(id);
+  let isChecked = elem.classList.contains("crossed");
+  if (isChecked)
+    elem.classList.remove("crossed");
+  else
+    elem.classList.add("crossed");
+  saveGameState();
+}
+
+function saveGameState() {
+  for (let i = 0; i < numRows; i++) {
+    for (let j = 0; j < numCols; j++) {
+      let id = i + "_" + j;
+      let elem = document.getElementById(id);
+      if (elem.innerHTML == "") continue;
+      let isChecked = elem.classList.contains("crossed");
+      save(lotoKey + id, !isChecked);
+    }
+  }
+}
+
+function loadGameState() {
+  for (let i = 0; i < numRows; i++) {
+    for (let j = 0; j < numCols; j++) {
+      let id = i + "_" + j;
+      let elem = document.getElementById(id);
+      if (elem.innerHTML == "") continue;
+      let isChecked = load(lotoKey + id) == "true";
+      if (isChecked)
+        elem.classList.remove("crossed");
+      else
+        elem.classList.add("crossed");
+    }
+  }
+}
+
+function toggle(id) {
+  let elem = document.getElementById(id);
+  if (elem.style.display == "block")
+    elem.style.display = "none";
+  else
+    elem.style.display = "block";
+}
+
+save = function (key, value) {};
+load = function (key) {
+  return null;
+};
+
+function start() {
+  if (supports_html5_storage()) {
+    save = function (key, value) {
+      localStorage.setItem(key, value);
+    };
+    load = function (key) {
+      return localStorage.getItem(key);
+    };
+  } else {
+    alert("Trình duyệt của bạn không hỗ trợ localStorage!");
+    return;
+  }
+  
+  let grid = load(lotoKey);
+  if (grid) {
+    console.log("Load bảng đã được tạo sẵn");
+    let node = document.getElementById("grid");
+    node.innerHTML = grid;
+    loadGameState();
+  }
+}

web/style.css

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+h2 {
+  background: blueviolet;
+  text-align: center;
+  padding: 10px;
+  border: 1px solid blue;
+}
+
+body {
+  font-family: Verdana, Geneva, Tahoma, sans-serif;
+  margin-left: 20px;
+  margin-right: 20px;
+}
+
+table {
+  width: 100%;
+}
+
+td {
+  padding: 10px 20px;
+  border-top: 1px solid lightgray;
+  border-left: 1px solid lightgray;
+  border-bottom: 1px solid darkgray;
+  border-right: 1px solid darkgray;
+}
+
+.error {
+  background-color: orange;
+  color: red;
+  padding: 5px;
+  margin: 20px 50px;
+  border: 1px solid red;
+}
+
+.hightlight {
+  background: yellow;
+}
+
+a {
+  color: blue;
+}
+
+td label {
+  cursor: pointer;
+}
+
+form {
+  margin: 5px;
+  padding: 5px;
+  color: blue;
+}
+
+#instructions {
+  display: none;
+  border: 1px solid blue;
+  margin: 10px;
+  padding: 20px;
+}
+
+table td.crossed {
+  background-image: linear-gradient(to bottom right, transparent calc(50% - 2px), black, transparent calc(50% + 2px));
+}