JavaScript is a powerful scripting language that you can use to make web pages interactive. It's one of the core technologies of the web, along with HTML and CSS. All modern browsers support JavaScript.
In this practice project, you'll learn fundamental programming concepts in JavaScript by coding your own Role Playing Game. You'll learn how to work with arrays, strings, objects, functions, loops, if/else statements, and more.
| index.html | styles.css | script.js |
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| JavaScript | CSS | 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="./index.html" />
<link rel="stylesheet" href="./styles.css">
<title>RPG - Dragon Repeller</title>
</head>
<body>
<div id="game">
<div id="stats">
<span class="stat">XP: <strong><span id="xpText">0</span></strong></span>
<span class="stat">Health: <strong><span id="healthText">100<span></strong></span>
<span class="stat">Gold: <strong><span id="goldText">50</span></strong></span>
</div>
<div id="controls">
<button id="button1">Go to store</button>
<button id="button2">Go to cave</button>
<button id="button3">Fight dragon</button>
</div>
<div id="monsterStats">
<span class="stat">Monster Name: <strong><span id="monsterName"></span></strong></span>
<span class="stat">Health: <strong><span id="monsterHealth"></span></strong></span>
</div>
<div id="text">
Welcome to Dragon Repeller.
You must defeat the dragon that
is preventing people from leaving the town.
You are in the town square.
Where do you want to go? Use the buttons above.
</div>
</div>
<script src="./script.js"></script>
</body>
</html>body {
background-color: #0a0a23;
}
#text {
background-color: #0a0a23;
color: #ffffff;
padding: 10px;
}
#game {
max-width: 500px;
max-height: 400px;
background-color: #ffffff;
color: #ffffff;
margin: 30px auto 0px;
padding: 10px;
}
#controls,
#stats {
border: 1px solid #0a0a23;
color: #0a0a23;
padding: 5px;
}
#monsterStats {
display: none;
border: 1px solid #0a0a23;
padding: 5px;
background-color: #c70d0d;
color: #ffffff;
}
.stat {
padding-right: 10px;
}
button {
cursor: pointer;
color: #0a0a23;
background-color: #feac32;
background-image: linear-gradient(#fecc4c, #ffac33);
border: 3px solid #feac32;
}let xp = 0;
let health = 100;
let gold = 50;
let currentWeaponIndex = 0;
let fighting;
let monsterHealth;
let inventory = ["stick"];
const button1 = document.querySelector("#button1");
const button2 = document.querySelector("#button2");
const button3 = document.querySelector("#button3");
const text = document.querySelector("#text");
const xpText = document.querySelector("#xpText");
const healthText = document.querySelector("#healthText");
const goldText = document.querySelector("#goldText");
const monsterStats = document.querySelector("#monsterStats");
const monsterName = document.querySelector("#monsterName");
const monsterHealthText = document.querySelector("#monsterHealth");
const weapons = [
{ name: "stick", power: 5 },
{ name: "dagger", power: 30 },
{ name: "claw hammer", power: 50 },
{ name: "sword", power: 100 },
];
const monsters = [
{ name: "slime", level: 2, health: 15 },
{ name: "fanged beast", level: 8, health: 60 },
{ name: "dragon", level: 20, health: 300 },
];
const locations = [
{
name: "town square",
"button text": ["Go to store", "Go to cave", "Fight dragon"],
"button functions": [goStore, goCave, fightDragon],
text: 'You are in the town square. You see a sign that says "Store".',
},
{
name: "store",
"button text": [
"Buy 10 health (10 gold)",
"Buy weapon (30 gold)",
"Go to town square",
],
"button functions": [buyHealth, buyWeapon, goTown],
text: "You enter the store.",
},
{
name: "cave",
"button text": ["Fight slime", "Fight fanged beast", "Go to town square"],
"button functions": [fightSlime, fightBeast, goTown],
text: "You enter the cave. You see some monsters.",
},
{
name: "fight",
"button text": ["Attack", "Dodge", "Run"],
"button functions": [attack, dodge, goTown],
text: "You are fighting a monster.",
},
{
name: "kill monster",
"button text": [
"Go to town square",
"Go to town square",
"Go to town square",
],
"button functions": [goTown, goTown, easterEgg],
text: 'The monster screams "Arg!" as it dies. You gain experience points and find gold.',
},
{
name: "lose",
"button text": ["REPLAY?", "REPLAY?", "REPLAY?"],
"button functions": [restart, restart, restart],
text: "You die. ☠",
},
{
name: "win",
"button text": ["REPLAY?", "REPLAY?", "REPLAY?"],
"button functions": [restart, restart, restart],
text: "You defeat the dragon! YOU WIN THE GAME! 🎉",
},
{
name: "easter egg",
"button text": ["2", "8", "Go to town square?"],
"button functions": [pickTwo, pickEight, goTown],
text: "You find a secret game. Pick a number above. Ten numbers will be randomly chosen between 0 and 10. If the number you choose matches one of the random numbers, you win!",
},
];
button1.onclick = goStore;
button2.onclick = goCave;
button3.onclick = fightDragon;
function update(location) {
monsterStats.style.display = "none";
button1.innerText = location["button text"][0];
button2.innerText = location["button text"][1];
button3.innerText = location["button text"][2];
button1.onclick = location["button functions"][0];
button2.onclick = location["button functions"][1];
button3.onclick = location["button functions"][2];
text.innerHTML = location.text;
}
function goTown() {
update(locations[0]);
}
function goStore() {
update(locations[1]);
}
function goCave() {
update(locations[2]);
}
function lose() {
update(locations[5]);
}
function winGame() {
update(locations[6]);
}
function easterEgg() {
update(locations[7]);
}
function goFight() {
update(locations[3]);
monsterHealth = monsters[fighting].health;
monsterStats.style.display = "block";
monsterName.innerText = monsters[fighting].name;
monsterHealthText.innerText = monsterHealth;
}
function dodge() {
text.innerText = "You dodge the attack from the " + monsters[fighting].name;
}
function attack() {
text.innerText = "The " + monsters[fighting].name + " attacks.";
text.innerText +=
" You attack it with your " + weapons[currentWeaponIndex].name + ".";
health -= getMonsterAttackValue(monsters[fighting].level);
if (isMonsterHit()) {
monsterHealth -=
weapons[currentWeaponIndex].power + Math.floor(Math.random() * xp) + 1;
} else {
text.innerText += " You miss.";
}
healthText.innerText = health;
monsterHealthText.innerText = monsterHealth;
if (health <= 0) {
lose();
} else if (monsterHealth <= 0) {
defeatMonster();
if (fighting === 2) {
winGame();
} else {
defeatMonster();
}
}
if (Math.random() <= 0.1 && inventory.length !== 1) {
text.innerText += " Your " + inventory.pop() + " breaks.";
currentWeaponIndex--;
}
}
function isMonsterHit() {
return Math.random() > 0.2 || health < 20;
}
function getMonsterAttackValue(level) {
const hit = level * 5 - Math.floor(Math.random() * xp);
console.log(hit);
return hit > 0 ? hit : 0;
}
function fightDragon() {
fighting = 2;
goFight();
}
function buyHealth() {
if (gold >= 10) {
gold -= 10;
health += 10;
goldText.innerText = gold;
healthText.innerText = health;
} else {
text.innerText = "You do not have enough gold to buy health.";
}
}
function buyWeapon() {
if (currentWeaponIndex < weapons.length - 1) {
if (gold >= 30) {
gold -= 30;
currentWeaponIndex++;
goldText.innerText = gold;
let newWeapon = weapons[currentWeaponIndex].name;
text.innerText = "You now have a " + newWeapon + ".";
inventory.push(newWeapon);
text.innerText += " In your inventory you have: " + inventory;
} else {
text.innerText = "You do not have enough gold to buy a weapon.";
}
} else {
text.innerText = "You already have the most powerful weapon!";
button2.innerText = "Sell weapon for 15 gold";
button2.onclick = sellWeapon;
}
}
function sellWeapon() {
if (inventory.length > 1) {
gold += 15;
goldText.innerText = gold;
let currentWeapon = inventory.shift();
text.innerText = "You sold a " + currentWeapon + ".";
text.innerText += " In your inventory you have: " + inventory;
} else {
text.innerText = "Don't sell your only weapon!";
}
}
function fightSlime() {
fighting = 0;
goFight();
}
function fightBeast() {
fighting = 1;
goFight();
}
function defeatMonster() {
gold += Math.floor(monsters[fighting].level * 6.7);
xp += monsters[fighting].level;
goldText.innerText = gold;
xpText.innerText = xp;
update(locations[4]);
}
function restart() {
xp = 0;
health = 100;
gold = 50;
currentWeaponIndex = 0;
inventory = ["stick"];
xpText.innerText = xp;
healthText.innerText = health;
goldText.innerText = gold;
goTown();
}
function pick(guess) {
const numbers = [];
for (let i = 0; i < 10; i++) {
numbers.push(Math.floor(Math.random() * 11));
text.innerText += numbers[i] + "\n";
}
if (numbers.includes(guess)) {
text.innerText += "Right! You win 20 gold!";
gold += 20;
goldText.innerText = gold;
} else {
text.innerText += "Wrong! You lose 10 health!";
health -= 10;
healthText.innerText = health;
if (health <= 0) {
lose();
}
}
text.innerText = "You picked " + guess + ". Here are the random numbers:\n";
}
function pickTwo() {
pick(2);
}
function pickEight() {
pick(8);
}