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calculator.html
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calculator.html
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<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>A simple Calculator</title>
<link rel="stylesheet" type="text/css" href="calculator.css">
</head>
<body>
<div id="container">
<div id="calculator">
<div id="result">
<div id="history"></div>
<input type="text" id="history-value"></input>
</div>
<div id="output">
<p id="output-value"></p>
</div>
</div>
<div id="keyboard">
<button class="operator" id="backspace">C</button>
<button class="operator" id="clear">CE</button>
<button class="operator" id="%">%</button>
<button class="operator" id="/">÷</button>
<button class="number" id="7">7</button>
<button class="number" id="8">8</button>
<button class="number" id="9">9</button>
<button class="operator" id="*">×</button>
<button class="number" id="4">4</button>
<button class="number" id="5">5</button>
<button class="number" id="6">6</buttonclass>
<button class="operator" id="-">-</button>
<button class="number" id="1">1</button>
<button class="number" id="2">2</button>
<button class="number" id="3">3</button>
<button class="operator" id="+">+</button>
<button class="number" id=".">.</button>
<button class="number" id="0">0</button>
<button class="empty"></button>
<button class="operator" id="=">=</button>
</div>
</div>
</div>
<script>
const buttons = document.querySelectorAll(".number")
let historyView = document.querySelector("#history-value")
let outputView = document.querySelector("#output-value")
const operators = document.querySelectorAll(".operator")
for (const button of buttons) {
button.addEventListener('click', function(event) {
historyView.value += event.target.id
})
}
for (const operator of operators) {
operator.addEventListener('click', function(event) {
if (event.target.id === 'clear') {
historyView.value = ''
} else if (event.target.id === 'backspace') {
historyView.value = historyView.value.slice(0, -1);
} else if (event.target.id === '=') {
let result = eval(historyView.value)
outputView.textContent = result
} else {
historyView.value += event.target.id
}
})
}
</script>
</body>
</html>