calculator/index.html at main · arraa/calculator · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Calculator</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>

    <div class="container">
        <form name="form">
            <div class="display">
                <input type="text" name="displayResult" id="myInput" placeholder="0"
                onkeypress="return validate(event);">
            </div>

            <div class="buttons">
                <div class="row">
                    <input type="button" id="ac" value="AC" onclick="document.getElementById(
                        'myInput').value = '' ">

                    <input type="button" id="hapus" onclick="backspace();" >
                    <input type="button" name="btndiv" value="/" onclick="calcNumbers(btndiv.value)">
                </div>


                <div class="row">

                    <input type="button" name="btn7" value="7" onclick="calcNumbers(btn7.value)">
                    <input type="button" name="btn8" value="8" onclick="calcNumbers(btn8.value)">
                    <input type="button" name="btn9" value="9" onclick="calcNumbers(btn9.value)">
                    <input type="button" name="btnplus" value="+" onclick="calcNumbers(btnplus.value)">

                </div>
                <div class="row">
                    <input type="button" name="btn4" value="4" onclick="calcNumbers(btn4.value)">
                    <input type="button" name="btn5" value="5" onclick="calcNumbers(btn5.value)">
                    <input type="button" name="btn6" value="6" onclick="calcNumbers(btn6.value)">
                    <input type="button" name="btnmin" value="-" onclick="calcNumbers(btnmin.value)">

                </div>
                <div class="row">
                    <input type="button" name="btn1" value="1" onclick="calcNumbers(btn1.value)">
                    <input type="button" name="btn2" value="2" onclick="calcNumbers(btn2.value)">
                    <input type="button" name="btn3" value="3" onclick="calcNumbers(btn3.value)">
                    <input type="button" name="btnmul" value="*" onclick="calcNumbers(btnmul.value)">

                </div>
                <div class="row">
                    <input type="button" name="btn00" value="00" onclick="calcNumbers(btn00.value)">
                    <input type="button" name="btn0" value="0" onclick="calcNumbers(btn0.value)">
                    <input type="button" name="btndot" value="." onclick="calcNumbers(btndot.value)">
                    <input type="button" name="btnqual" value="="
                        onclick="displayResult.value=eval(displayResult.value)">
                </div>
            </div>
        </form>
    </div>

    <script type="text/javascript">
        function validate(event) {
            var numbtn = new RegExp("^[0-9-+/-=*]");
            var key = String.fromCharCode(event.charCode ? event.which : event.charCode);
            if(!numbtn.test(key)) {
                event.preventDefault();
                return false
            }
        }
    </script>

    <script>
        function calcNumbers(result) {
            form.displayResult.value=form.displayResult.value+result;
        }
    </script>

    <script>
        var backspace = function() {
            var del = document.getElementById('myInput').value;
            document.getElementById('myInput').value = del.substring(0, del.length - 1);
        }
    </script>

</body>
</html>