Build your own MINESWEEPER game in pure JavaScript, HTML and CSS
In this walkthrough, we show you how to build Minesweeper in pure JavaScript, HTML, and CSS.
This walkthrough was such a fun one to make as I really enjoyed explaining recursion with the help of a south-park-esque cat.
If you have ever wondered what recursion was, this video is perfect for you!
In addition to this, we will also be practising using inbuilt methods such as:
- addEventListener()
- setAttribute()
- fill()
- setInterval()
- some()
- every()
- forEach()
- includes()
- contains()
- add()
- remove()
- createElement()
- appendChild()
- push()
- Array()
- continue
And many more.
Source Code:
HTML File:
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="UTF-8">
<title>Minesweeper</title>
<link rel="stylesheet" href="style.css"></link>
<script src="app.js" charset="utf-8"></script>
<link href="https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@700&display=swap" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="grid"></div>
<div>Flags left: <span id='flags-left'></span></div>
<div id="result"></div>
</div>
</body>
</html>CSS File:
.container {
width: 500px;
align-content: center;
}
.grid {
height: 400px;
width: 400px;
display: flex;
flex-wrap: wrap;
background-color: #dcd6bc;
margin-left: 50px;
margin-top: 20px;
border: 10px solid #dcd6bc;
margin-bottom: 10px;
}
div {
font-size: 25px;
text-align: center;
font-family: 'Roboto Mono', monospace;
}
.valid {
height: 40px;
width: 40px;
border: 5px solid;
border-color: #f5f3eb #bab7a9 #bab7a9 #fff9db;
box-sizing: border-box;
}
.checked {
height: 40px;
width: 40px;
border: 2px solid;
background-color: #cecab7;
border-color: #9c998d;
box-sizing: border-box;
}
.bomb {
height: 40px;
width: 40px;
border: 5px solid;
border-color: #f5f3eb #bab7a9 #bab7a9 #fff9db;
box-sizing: border-box;
}
.one {
color: #e76346;
}
.two {
color: #4199d3;
}
.three {
color: #57da59;
}
.four{
color: #bb41d3;
}
#result {
margin-top: 5px;
color: #e76346;
}JavaScript File:
document.addEventListener('DOMContentLoaded', () => {
const grid = document.querySelector('.grid')
const flagsLeft = document.querySelector('#flags-left')
const result = document.querySelector('#result')
let width = 10
let bombAmount = 20
let flags = 0
let squares = []
let isGameOver = false
//create Board
function createBoard() {
flagsLeft.innerHTML = bombAmount
//get shuffled game array with random bombs
const bombsArray = Array(bombAmount).fill('bomb')
const emptyArray = Array(width*width - bombAmount).fill('valid')
const gameArray = emptyArray.concat(bombsArray)
const shuffledArray = gameArray.sort(() => Math.random() -0.5)
for(let i = 0; i < width*width; i++) {
const square = document.createElement('div')
square.setAttribute('id', i)
square.classList.add(shuffledArray[i])
grid.appendChild(square)
squares.push(square)
//normal click
square.addEventListener('click', function(e) {
click(square)
})
//cntrl and left click
square.oncontextmenu = function(e) {
e.preventDefault()
addFlag(square)
}
}
//add numbers
for (let i = 0; i < squares.length; i++) {
let total = 0
const isLeftEdge = (i % width === 0)
const isRightEdge = (i % width === width -1)
if (squares[i].classList.contains('valid')) {
if (i > 0 && !isLeftEdge && squares[i -1].classList.contains('bomb')) total ++
if (i > 9 && !isRightEdge && squares[i +1 -width].classList.contains('bomb')) total ++
if (i > 10 && squares[i -width].classList.contains('bomb')) total ++
if (i > 11 && !isLeftEdge && squares[i -1 -width].classList.contains('bomb')) total ++
if (i < 98 && !isRightEdge && squares[i +1].classList.contains('bomb')) total ++
if (i < 90 && !isLeftEdge && squares[i -1 +width].classList.contains('bomb')) total ++
if (i < 88 && !isRightEdge && squares[i +1 +width].classList.contains('bomb')) total ++
if (i < 89 && squares[i +width].classList.contains('bomb')) total ++
squares[i].setAttribute('data', total)
}
}
}
createBoard()
//add Flag with right click
function addFlag(square) {
if (isGameOver) return
if (!square.classList.contains('checked') && (flags < bombAmount)) {
if (!square.classList.contains('flag')) {
square.classList.add('flag')
square.innerHTML = ' 🚩'
flags ++
flagsLeft.innerHTML = bombAmount- flags
checkForWin()
} else {
square.classList.remove('flag')
square.innerHTML = ''
flags --
flagsLeft.innerHTML = bombAmount- flags
}
}
}
//click on square actions
function click(square) {
let currentId = square.id
if (isGameOver) return
if (square.classList.contains('checked') || square.classList.contains('flag')) return
if (square.classList.contains('bomb')) {
gameOver(square)
} else {
let total = square.getAttribute('data')
if (total !=0) {
square.classList.add('checked')
if (total == 1) square.classList.add('one')
if (total == 2) square.classList.add('two')
if (total == 3) square.classList.add('three')
if (total == 4) square.classList.add('four')
square.innerHTML = total
return
}
checkSquare(square, currentId)
}
square.classList.add('checked')
}
//check neighboring squares once square is clicked
function checkSquare(square, currentId) {
const isLeftEdge = (currentId % width === 0)
const isRightEdge = (currentId % width === width -1)
setTimeout(() => {
if (currentId > 0 && !isLeftEdge) {
const newId = squares[parseInt(currentId) -1].id
//const newId = parseInt(currentId) - 1 ....refactor
const newSquare = document.getElementById(newId)
click(newSquare)
}
if (currentId > 9 && !isRightEdge) {
const newId = squares[parseInt(currentId) +1 -width].id
//const newId = parseInt(currentId) +1 -width ....refactor
const newSquare = document.getElementById(newId)
click(newSquare)
}
if (currentId > 10) {
const newId = squares[parseInt(currentId -width)].id
//const newId = parseInt(currentId) -width ....refactor
const newSquare = document.getElementById(newId)
click(newSquare)
}
if (currentId > 11 && !isLeftEdge) {
const newId = squares[parseInt(currentId) -1 -width].id
//const newId = parseInt(currentId) -1 -width ....refactor
const newSquare = document.getElementById(newId)
click(newSquare)
}
if (currentId < 98 && !isRightEdge) {
const newId = squares[parseInt(currentId) +1].id
//const newId = parseInt(currentId) +1 ....refactor
const newSquare = document.getElementById(newId)
click(newSquare)
}
if (currentId < 90 && !isLeftEdge) {
const newId = squares[parseInt(currentId) -1 +width].id
//const newId = parseInt(currentId) -1 +width ....refactor
const newSquare = document.getElementById(newId)
click(newSquare)
}
if (currentId < 88 && !isRightEdge) {
const newId = squares[parseInt(currentId) +1 +width].id
//const newId = parseInt(currentId) +1 +width ....refactor
const newSquare = document.getElementById(newId)
click(newSquare)
}
if (currentId < 89) {
const newId = squares[parseInt(currentId) +width].id
//const newId = parseInt(currentId) +width ....refactor
const newSquare = document.getElementById(newId)
click(newSquare)
}
}, 10)
}
//game over
function gameOver(square) {
result.innerHTML = 'BOOM! Game Over!'
isGameOver = true
//show ALL the bombs
squares.forEach(square => {
if (square.classList.contains('bomb')) {
square.innerHTML = '💣'
square.classList.remove('bomb')
square.classList.add('checked')
}
})
}
//check for win
function checkForWin() {
///simplified win argument
let matches = 0
for (let i = 0; i < squares.length; i++) {
if (squares[i].classList.contains('flag') && squares[i].classList.contains('bomb')) {
matches ++
}
if (matches === bombAmount) {
result.innerHTML = 'YOU WIN!'
isGameOver = true
}
}
}
})GitHub: https://github.com/kubowania/minesweeper/blob/master/app.js
#javascript #html #css #game-development #programming
3.90 GEEK