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myProject.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">
<title>Javascript | Project</title>
<link rel="stylesheet" href="bootstrap.css">
</head>
<body>
<header class="p-3 bg-light text-center">
<h1>webCal</h1>
</header>
<section class="row">
<div class="col col-lg-5 p-5 bg-light m-5 border rounded">
<div class="mb-4 pe-4">
<div id="display" class="w-100 bg-white rounded-pill p-3 border"></div>
</div>
<div class="row">
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('1')">1</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('2')">2</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('3')">3</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('4')">4</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('5')">5</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('6')">6</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('7')">7</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('8')">8</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('9')">9</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('0')">0</button>
</div>
<div class="col-3">
<button class="btn btn-outline-primary px-4 mb-2 text-center rounded border" onclick="showValue('+')">+</button>
</div>
<div class="col-3">
<button class="btn btn-outline-primary px-4 mb-2 text-center rounded border" onclick="showValue('-')">-</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('/')">/</button>
</div>
<div class="col-3">
<button class="btn btn-outline-danger px-4 mb-2 text-center rounded border" onclick="showValue('*')">*</button>
</div>
<div class="col-3">
<button class="btn btn-warning px-4 mb-2 text-center rounded border" onclick="clearDisplay()"> C </button>
</div>
<div class="col-3">
<button class="btn btn-danger px-4 mb-2 text-center rounded border" onclick="calculate()"> = </button>
</div>
</div>
</div>
</section>
<script type="text/javascript">
const display = document.querySelector('#display');
function showValue(param){
display.textContent += param;
}
function clearDisplay (){
display.textContent = '';
}
function calculate (){
try {
display.textContent = eval(display.textContent);
} catch (error) {
display.textContent = 'ERROR: please check your equation';
setTimeout(()=>{
clearDisplay();
},1000);
}
}
</script>
</body>
</html>