apps/validate_aadhaar.html at master · srinivasankb/apps · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Verhoeff's Check</title>
    <style>
        /* Base Styles */
        body {
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
            margin: 0;
            padding: 0;
            color: #333;
            text-align: center; /* Center-align the content */
        }

        table {
            margin: 0 auto;
            text-align: left; /* Left-align table contents */
        }

        td {
            padding: 10px;
        }

        input[type="text"] {
            width: 100%;
            padding: 10px;
            margin: 5px 0;
            border: 1px solid #ccc;
            border-radius: 3px;
        }

        input[type="button"] {
            padding: 10px 20px;
            background-color: #0074d9;
            color: #fff;
            border: none;
            cursor: pointer;
        }

        /* Header Styles */
        h1 {
            font-size: 22px;
            margin-bottom: 20px;
            color: #0074d9;
        }
         h2 {
            font-size: 18px;
            margin-bottom: 20px;
            color: #0074d9;
        }


        /* Button Hover Effect */
        input[type="button"]:hover {
            background-color: #0056b3;
        }
    </style>
    <script>
        // JavaScript code for Verhoeff's Check
        var FnF = new Array();
        FnF[0] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
        FnF[1] = [1, 5, 7, 6, 2, 8, 3, 0, 9, 4];
        for (var i = 2; i < 8; i++) {
            FnF[i] = [];
            for (var j = 0; j < 10; j++)
                FnF[i][j] = FnF[i - 1][FnF[1][j]];
        }

        var Dihedral = [
            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
            [1, 2, 3, 4, 0, 6, 7, 8, 9, 5],
            [2, 3, 4, 0, 1, 7, 8, 9, 5, 6],
            [3, 4, 0, 1, 2, 8, 9, 5, 6, 7],
            [4, 0, 1, 2, 3, 9, 5, 6, 7, 8],
            [5, 9, 8, 7, 6, 0, 4, 3, 2, 1],
            [6, 5, 9, 8, 7, 1, 0, 4, 3, 2],
            [7, 6, 5, 9, 8, 2, 1, 0, 4, 3],
            [8, 7, 6, 5, 9, 3, 2, 1, 0, 4],
            [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
        ];

        var InverseD5 = [0, 4, 3, 2, 1, 5, 6, 7, 8, 9];

        function VerhoeffCheck() {
            var check = 0;
            var IdValue = document.form.numcd.value;
            for (var i = IdValue.length - 1; i >= 0; i--)
                check = Dihedral[check][FnF[(IdValue.length - i - 1) % 8][IdValue.charAt(i)]];
            if (check !== 0)
                document.form.out.value = "INVALID";
            else
                document.form.out.value = "VALID";
        }

        function VerhoeffCompute() {
            var IdValue = document.form.num.value;
            var check = 0;
            for (var i = IdValue.length - 1; i >= 0; i--)
                check = Dihedral[check][FnF[(IdValue.length - i) % 8][IdValue.charAt(i)]];
            document.form.numcd.value = document.form.num.value + InverseD5[check];
        }

        function handleInput() {
            var aadhaarInput = document.form.numcd;
            var checkButton = document.getElementById("checkBtn");
            if (aadhaarInput.value.length === 12) {
                checkButton.disabled = false;
            } else {
                checkButton.disabled = true;
            }
        }
    </script>
</head>
<body>
    <h1>Aadhaar Number Validation</h1>
    <h2>Using Verhoeff's Dihedral Algorithm</h2>
    <form name="form">
        <table>
            <tr>
                <td>Aadhaar Number</td>
                <td>
                    <input name="numcd" type="text" maxlength="12" placeholder="12 Digit Aadhaar Number" oninput="handleInput()">
                </td>
                <td>
                    <input id="checkBtn" type="button" value="Check" onclick="VerhoeffCheck()" disabled>
                </td>
            </tr>
            <tr>
                <td>Result (Valid / Invalid)</td>
                <td>
                    <input name="out" type="text" size="6" readonly>
                </td>
                <td></td>
            </tr>
        </table>
    </form>
</body>
</html>