<!DOCTYPE html>
<html>
<head>
<title>Калькулятор</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-GLhlTQ8iRABdZLl6O3oVMWSktQOp6b7In1Zl3/Jr59b6EGGoI1aFkw7cmDA6j6gD" crossorigin="anonymous">
</head>
<body>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/js/bootstrap.bundle.min.js" integrity="sha384-w76AqPfDkMBDXo30jS1Sgez6pr3x5MlQ1ZAGC+nuZB+EYdgRZgiwxhTBTkF7CXvN" crossorigin="anonymous"></script>
<div class="m-auto dflex flex-row align-items-center">
<div class="col-sm-3 my-1">
<input type="number" class="form-control" id="num1">
</div>
<div class="col-sm-3 my-1">
<select class="form-control" id="operation">
<option value="sum" selected>+</option>
<option value="sub">-</option>
<option value="mul">*</option>
<option value="div">/</option>
</select>
</div>
<div class="col-sm-3 my-1">
<input type="number" class="form-control" id="num2">
</div>
<div class="col-sm-3 my-1">
<button type="button" class="form-control btn btn-light" id="get-result" onclick="calculate()">=</button>
</div>
<div class="col-sm-3 my-1">
<p class="h5" id="result"></p>
</div>
</div>
<script>
async function calculate() {
const num1 = document.getElementById("num1").value
const num2 = document.getElementById("num2").value
document.getElementById("result").innerHTML = await (await fetch(`http://127.0.0.1:8080/${document.getElementById("operation").value}?num1=${num1}&num2=${num2}`)).text()
}
</script>
</body>
</html>