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sudoku.html
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sudoku.html
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<!DOCTYPE html>
<title>Sudoku Solver w/ GUI | © 2022 Gabeperson</title>
<style>
div {
display: flex;
justify-content: center;
align-content: center;
flex-direction: column;
text-align: center;
border-style: solid;
font-size: 40px;
border-color: grey;
border-width: 1px;
}
.numberpad {
width: 100px;
height: 100px;
position: relative;
font-size: 40px;
}
#numpadToggle {
font-size: 20px;
height: 100px;
width: 100px;
position: relative;
}
#bigger {
font-size: 20px;
height: 100px;
width: 100px;
position: relative;
}
#smaller {
font-size: 20px;
height: 100px;
width: 100px;
position: relative;
}
</style>
<body>
<button id="numpadToggle" onClick="triggerNumpad()">Show</button>
<button id="bigger" onClick="sizeControl(true);">[+]</button>
<button id="smaller" onClick="sizeControl(false);">[-]</button>
<span id="numpad" style="display: inline-block;">
<button class="numberpad" onClick="setNumber(1);">
1
</button>
<button class="numberpad" onClick="setNumber(2);">
2
</button>
<button class="numberpad" onClick="setNumber(3);">
3
</button>
<button class="numberpad" onClick="setNumber(4);">
4
</button>
<button class="numberpad" onClick="setNumber(5);">
5
</button>
<button class="numberpad" onClick="setNumber(6);">
6
</button>
<button class="numberpad" onClick="setNumber(7);">
7
</button>
<button class="numberpad" onClick="setNumber(8);">
8
</button>
<button class="numberpad" onClick="setNumber(9);">
9
</button>
<button class="numberpad" onClick='
if (selected) {
let elem = document.getElementById(selected);
elem.innerHTML = "";
let idList = selected.split(",");
grid[idList[0]][idList[1]] = 0;
}
'>
del
</button>
</span>
</center>
<center id="centertag"></center>
<center>
</body>
<script>
const keyList = [1, 2, 3, 4, 5, 6, 7, 8, 9];
var grid = [
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
];
const arrowList = ["ArrowLeft", "ArrowDown", "ArrowRight", "ArrowUp"];
var selected;
{
let size = "80px"; // 50 if smaller
let table = document.createElement("table");
table.cellSpacing = 0.5;
table.border = 0;
table.cellPadding = 0;
for (var i = 0; i < 9; i++) {
let yDirection = document.createElement("tr");
for (var j = 0; j < 9; j++) {
let xDirection = document.createElement("td");
let div = document.createElement("div");
let p = document.createElement("p");
let id = i + "," + j;
div.id = id;
div.style.width = size;
div.style.height = size;
if (i == 0 || i == 3 || i == 6) {
div.style.borderTopWidth = "3px";
div.style.borderTopColor = "black";
}
if (j == 0 || j==3 || j == 6) {
div.style.borderLeftWidth = "3px";
div.style.borderLeftColor = "black";
}
if (i == 8) {
div.style.borderBottomWidth = "3px";
div.style.borderBottomColor = "black";
}
if (j == 8) {
div.style.borderRightWidth = "3px";
div.style.borderRightColor = "black";
}
div.addEventListener("click", select);
xDirection.appendChild(div);
yDirection.appendChild(xDirection);
}
table.appendChild(yDirection);
}
document.getElementById("centertag").appendChild(table);
}
var solved = false;
function possible(y, x, n) {
for (var i = 0; i < 9; i++) {
if (grid[y][i] == n) {
return false;
}
}
for (var j = 0; j < 9; j++) {
if (grid[j][x] == n) {
return false;
}
}
var x0 = Math.floor(x / 3) * 3;
var y0 = Math.floor(y / 3) * 3;
for (var k = 0; k < 3; k++) {
for (var l = 0; l < 3; l++) {
if (grid[y0 + k][x0 + l] == n) {
return false;
}
}
}
return true;
}
var maxRepets = 200000;
var repets = 0;
function solve() {
repets++;
for (var y = 0; y < 9; y++) {
for (var x = 0; x < 9; x++) {
if (grid[y][x] == 0) {
for (var n = 1; n < 10; n++) {
if (possible(y, x, n)) {
grid[y][x] = n;
solve();
if (repets > maxRepets) {
return;
}
if (solved) {
return;
}
grid[y][x] = 0;
}
}
return;
}
}
}
solved = true;
}
function select() {
try {
document.getElementById(selected).style.backgroundColor = "white";
} catch {}
selected = this.id;
document.getElementById(this.id).style.backgroundColor = "#DDDDDD";
}
function unselect() {
document.getElementById(selected).style.backgroundColor = "white";
selected = undefined;
}
function setNumber(number) {
if (selected) {
let elem = document.getElementById(selected);
let idList = selected.split(",");
grid[idList[0]][idList[1]] = parseInt(number);
elem.innerHTML = number;
return;
}
}
document.addEventListener("keydown", function (e) {
e = e || window.event;
if (keyList.includes(parseInt(e.key))) {
if (selected) {
setNumber(e.key);
}
}
if (e.key == "Backspace") {
let elem = document.getElementById(selected);
elem.innerHTML = "";
let idList = selected.split(",");
grid[idList[0]][idList[1]] = 0;
} else if (arrowList.includes(e.key) && selected) {
switch (e.key) {
case "ArrowUp": {
let idList = selected.split(",");
if (parseInt(idList[0]) == 0) {
return;
}
let newid = parseInt(idList[0]) - 1 + "," + idList[1];
select.call(document.getElementById(newid));
break;
}
case "ArrowRight": {
let idList = selected.split(",");
if (parseInt(idList[1]) == 8) {
return;
}
let newid = idList[0] + "," + (parseInt(idList[1]) + 1);
select.call(document.getElementById(newid));
break;
}
case "ArrowDown": {
let idList = selected.split(",");
if (parseInt(idList[0]) == 8) {
return;
}
let newid = parseInt(idList[0]) + 1 + "," + idList[1];
select.call(document.getElementById(newid));
break;
}
case "ArrowLeft": {
let idList = selected.split(",");
if (parseInt(idList[1]) == 0) {
return;
}
let newid = idList[0] + "," + (parseInt(idList[1]) - 1);
select.call(document.getElementById(newid));
break;
}
}
return;
}
if (e.key == "Escape") {
unselect();
}
});
function solveSudoku() {
var arrayBackup = JSON.parse(JSON.stringify(grid));
for (var rotations = 0; rotations < 4; rotations++) {
repets = 0;
grid = JSON.parse(JSON.stringify(arrayBackup));
for (var rotation = 0; rotation < rotations; rotation++) {
grid = turnGrid(grid);
}
solve();
if (solved) {
for (var rotation = 0; rotation < (4 - rotations) % 4; rotation++) {
grid = turnGrid(grid);
}
break;
}
}
if (!solved) {
grid = JSON.parse(JSON.stringify(arrayBackup));
alert("Current grid is impossible to solve or is too difficult to brute force.")
} else {
for (let i = 0; i < 9; i++) {
for (let j = 0; j < 9; j++) {
let elem = document.getElementById(i + "," + j);
elem.innerHTML = grid[i][j];
}
}
}
}
{
let solveButton = document.createElement("button");
solveButton.addEventListener("click", function () {
solveSudoku();
});
solveButton.innerHTML = "Solve The Puzzle!";
solveButton.style.height = "120px";
solveButton.style.width = "230px";
document.getElementById("centertag").appendChild(solveButton);
}
{
let reloadButton = document.createElement("button");
reloadButton.addEventListener("click", reset);
reloadButton.innerHTML = "Solve a new puzzle!";
reloadButton.style.height = "120px";
reloadButton.style.width = "230px";
document.getElementById("centertag").appendChild(reloadButton);
}
var numPadVisibility = false;
document.getElementById("numpad").style.visibility = "hidden";
function triggerNumpad() {
if (numPadVisibility) {
document.getElementById("numpad").style.visibility = "hidden";
document.getElementById("numpadToggle").innerHTML = "Show";
} else {
document.getElementById("numpad").style.visibility = "visible";
document.getElementById("numpadToggle").innerHTML = "Hide";
}
numPadVisibility = !numPadVisibility;
}
function sizeControl(bigger) {
let size = parseInt(document.getElementById("0,0").style.height);
if (bigger) {
size += 5;
} else {
size -= 5;
}
for (let i = 0; i < 9; i++) {
for (let j = 0; j < 9; j++) {
let elem = document.getElementById(i + "," + j);
elem.style.width = size + "px";
elem.style.height = size + "px";
}
}
}
function reset() {
grid = [
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
];
for (let i = 0; i < 9; i++) {
for (let j = 0; j < 9; j++) {
let elem = document.getElementById(i + "," + j);
elem.innerHTML = "";
}
}
solved = false;
}
function turnGrid(grid) {
var newGrid = [];
for (var i = 0; i < 9; i++) {
var row = []
for (var j = 0; j < 9; j++) {
row.push(grid[8-j][i]);
}
newGrid.push(row);
}
return newGrid;
}
</script>