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Add calculator demo app using Material Design Lite #5465

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44 changes: 44 additions & 0 deletions demos/calculator-app/app.js
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Original file line number Diff line number Diff line change
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const display = document.getElementById("display");
const buttons = document.querySelectorAll("button");

buttons.forEach(button => {
button.addEventListener("click", () => handleInput(button.innerText));
});

function handleInput(value) {
if (value === "C") {
display.value = "";
} else if (value === "⌫") {
display.value = display.value.slice(0, -1);
} else if (value === "=") {
calculate();
} else {
display.value += value;
}
}

function calculate() {
try {
const result = display.value
.replace(/×/g, "*")
.replace(/÷/g, "/")
.replace(/−/g, "-");

display.value = eval(result);
} catch {
display.value = "Error";
}
}

/* Keyboard Support */
document.addEventListener("keydown", (e) => {
if ((e.key >= 0 && e.key <= 9) || "+-*/.".includes(e.key)) {
display.value += e.key;
} else if (e.key === "Enter") {
calculate();
} else if (e.key === "Backspace") {
display.value = display.value.slice(0, -1);
} else if (e.key === "Escape") {
display.value = "";
}
});
41 changes: 41 additions & 0 deletions demos/calculator-app/index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Calculator UI App</title>
<link rel="stylesheet" href="style.css" />
</head>
<body>

<div class="calculator">
<input type="text" id="display" readonly />

<div class="buttons">
<button class="clear">C</button>
<button class="delete">⌫</button>
<button class="operator">÷</button>
<button class="operator">×</button>

<button>7</button>
<button>8</button>
<button>9</button>
<button class="operator">−</button>

<button>4</button>
<button>5</button>
<button>6</button>
<button class="operator">+</button>

<button>1</button>
<button>2</button>
<button>3</button>
<button class="equal">=</button>

<button class="zero">0</button>
<button>.</button>
</div>
</div>

<script src="app.js"></script>
</body>
</html>
76 changes: 76 additions & 0 deletions demos/calculator-app/style.css
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* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: Verdana, Tahoma, sans-serif;
}

body {
height: 100vh;
background: linear-gradient(135deg, #764ba2, #667eea);
display: flex;
justify-content: center;
align-items: center;
}

.calculator {
width: 320px;
background: #222;
border-radius: 10px;
padding: 15px;
}

#display {
width: 100%;
height: 60px;
background: #000;
color: #0f0;
font-size: 2rem;
text-align: right;
padding: 10px;
border: none;
margin-bottom: 10px;
}

.buttons {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 10px;
}

button {
padding: 15px;
font-size: 1.2rem;
border: none;
border-radius: 5px;
cursor: pointer;
}

button:hover {
opacity: 0.8;
}

.operator {
background: #ff9f43;
}

.equal {
background: #1dd1a1;
grid-row: span 2;
}

.clear {
background: #ee5253;
}

.delete {
background: #576574;
}

.zero {
grid-column: span 2;
}

button:not(.operator):not(.equal):not(.clear):not(.delete) {
background: #c8d6e5;
}