JSExamples/Example2.html at main · rajucreate/JSExamples · GitHub

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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>Simple Calculator</title>
    <link rel="stylesheet" href="example2.css">
</head>
<body>
    <h2>Simple Calculator</h2>
    <input type="text" id="klu">
    <button onclick="calculate()" id="valueBtn">=</button>
    <button onclick="clearDisplay()">Clear</button>
    <h1 class="answer" id="answer"></h1>
    <script>
        const inputEl = document.getElementById("klu");
        const answerEl = document.getElementById("answer");
        inputEl.addEventListener("keydown", (event) =>{
            if (event.key === "Enter") {
                calculate();
            }
        });
        function calculate() {
            try {
                const expr = inputEl.value;
                answerEl.textContent = "Result: " + eval(expr);
            } catch {
                alert("Error");
            }
        }

        function clearDisplay() {
            inputEl.value = "";
            answerEl.textContent = "";
        }

    </script>
</body>
</html>