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Ejemplo de formulario de registro HTML

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Payment - Form</title>
    <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="container">
        <h1>Payment Details</h1>
        <div class="decoration"></div>
        <div class="input_container">
            <label class="input_label" for="card-number-input">Card Number</label>
            <input type="text" id="card-number-input" class="input_field" placeholder="Enter Card Number" maxlength="19">
            <img id="card-icon" class="card-icon" src="" alt="Card Type Icon">
            <div id="card-number-error" class="input_error hidden">Invalid card number</div>
        </div>
        <div class="input_container">
            <label class="input_label" for="expiry-date-input">Expiry Date (MM/YY)</label>
            <input type="text" id="expiry-date-input" class="input_field" placeholder="MM/YY" maxlength="5">
            <div id="expiry-date-error" class="input_error hidden">Invalid expiry date</div>
        </div>
        <div class="input_container">
            <label class="input_label" for="cardholder-name-input">Cardholder Name</label>
            <input type="text" id="cardholder-name-input" class="input_field" placeholder="Your Full Name">
            <div id="cardholder-name-error" class="input_error hidden">Name cannot contain numbers</div>
        </div>
        <div class="input_container">
            <label class="input_label" for="cvv-input">Security Code (CVV)</label>
            <input type="text" id="cvv-input" class="input_field" placeholder="CVV" maxlength="3">
            <div id="cvv-error" class="input_error hidden">Invalid CVV</div>
        </div>
        <button class="button" id="card-button">
            <span>Pay with Card</span>
        </button>
        <button class="button" id="paypal-button">
            <span>Pay with PayPal</span>
        </button>
        <div class="footer">
            <p>© 2024 Anes. All Rights Reserved.</p>
        </div>
    </div>

CSS

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    background: linear-gradient(135deg, #001f3f, #0e4e92);
    animation: gradientAnimation 10s ease infinite;
}

@keyframes gradientAnimation {
    0% { background-position: 0% 0%; }
    50% { background-position: 100% 100%; }
    100% { background-position: 0% 0%; }
}

.container {
    width: 90%;
    max-width: 450px;
    background-color: rgba(25, 25, 25, 0.9);
    border-radius: 15px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.8);
    padding: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

h1 {
    color: #1e90ff;
    margin-bottom: 20px;
    font-size: 2.5em;
    text-shadow: 1px 1px 10px rgba(0, 0, 0, 0.7);
}

.input_container {
    margin-bottom: 20px;
    text-align: left;
    position: relative;
}

.input_label {
    font-size: 14px;
    color: #d1d1d1;
    font-weight: 600;
    display: block;
    margin-bottom: 5px;
}

.input_field {
    width: 100%;
    height: 45px;
    padding: 0 16px; /* Remove right padding */
    border-radius: 9px;
    background-color: #1a1a1a;
    color: #1e90ff;
    border: 1px solid #444;
    transition: all 0.3s;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
    margin-bottom: 5px; /* Space between input and error */
}

.input_field:focus {
    border: 1px solid #1e90ff;
    background-color: #333;
    box-shadow: 0 0 5px rgba(30, 144, 255, 0.5);
}

.input_error {
    color: #ff4d4d;
    font-size: 12px;
    margin-top: 5px;
}

.card-icon {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: auto;
    display: none; /* Hide by default */
}

.button {
    background: #005ea6;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 15px 20px;
    font-size: 18px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s;
    width: 100%;
    margin-top: 10px;
}

.button:hover {
    background: #007bb5;
    transform: translateY(-2px);
}

.footer {
    text-align: center;
    margin-top: 20px;
    color: #d1d1d1;
    font-size: 12px;
}

.decoration {
    width: 100%;
    height: 10px;
    background: linear-gradient(90deg, #1e90ff, #005ea6);
    border-radius: 5px;
    margin-bottom: 20px;
}

.notification {
    position: fixed;
    top: 20px;
    right: -300px;
    background-color: #1e90ff;
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    transition: right 0.5s ease;
    z-index: 1000;
}

.hidden {
    display: none;
}

document.addEventListener("DOMContentLoaded", function() {
    const cardNumberInput = document.getElementById('card-number-input');
    const expiryDateInput = document.getElementById('expiry-date-input');
    const cvvInput = document.getElementById('cvv-input');
    const cardholderNameInput = document.getElementById('cardholder-name-input');
    const cardIcon = document.getElementById('card-icon');

cardNumberInput.addEventListener('input', function(e) {
        let value = e.target.value.replace(/\D/g, '').substring(0, 16);
        e.target.value = value.replace(/(\d{4})(?=\d)/g, '$1 ');

// Determine card type
        const cardType = getCardType(value);
        if (cardType) {
            cardIcon.src = cardType.icon;
            cardIcon.style.display = 'block'; // Show the icon
        } else {
            cardIcon.style.display = 'none'; // Hide the icon
            document.getElementById('card-number-error').classList.remove('hidden'); // Show error
        }
    });

expiryDateInput.addEventListener('input', function(e) {
        let value = e.target.value.replace(/\D/g, '').substring(0, 4);
        e.target.value = value.length >= 2 ? value.substring(0, 2) + '/' + value.substring(2, 4) : value;

if (!/^(0[1-9]|1[0-2])\/?([0-9]{2})$/.test(e.target.value)) {
            document.getElementById('expiry-date-error').classList.remove('hidden'); // Show error
        } else {
            document.getElementById('expiry-date-error').classList.add('hidden'); // Hide error
        }
    });

cvvInput.addEventListener('input', function(e) {
        e.target.value = e.target.value.replace(/\D/g, '').substring(0, 3);
        if (e.target.value.length < 3) {
            document.getElementById('cvv-error').classList.remove('hidden'); // Show error
        } else {
            document.getElementById('cvv-error').classList.add('hidden'); // Hide error
        }
    });

cardholderNameInput.addEventListener('input', function(e) {
        e.target.value = e.target.value.replace(/[0-9]/g, '');
        if (/\d/.test(e.target.value)) {
            document.getElementById('cardholder-name-error').classList.remove('hidden'); // Show error
        } else {
            document.getElementById('cardholder-name-error').classList.add('hidden'); // Hide error
        }
    });

function getCardType(number) {
        const cardTypes = [
            { name: 'Visa', regex: /^4[0-9]{12}(?:[0-9]{3})?/, icon: 'https://upload.wikimedia.org/wikipedia/commons/4/41/Visa_Inc._logo.svg' },
            { name: 'MasterCard', regex: /^5[1-5][0-9]{14}/, icon: 'https://upload.wikimedia.org/wikipedia/commons/0/4d/MasterCard-logo.svg' },
            { name: 'American Express', regex: /^3[47][0-9]{13}/, icon: 'https://upload.wikimedia.org/wikipedia/commons/3/3f/American_Express_logo.svg' },
            { name: 'Discover', regex: /^6(?:011|5[0-9]{2})[0-9]{12}/, icon: 'https://upload.wikimedia.org/wikipedia/commons/5/5e/Discover_Logo.svg' }
        ];
        return cardTypes.find(type => type.regex.test(number)) || null;
    }

document.getElementById('card-button').addEventListener('click', () => {
        if (document.getElementById('card-number-error').classList.contains('hidden') &&
            document.getElementById('expiry-date-error').classList.contains('hidden') &&
            document.getElementById('cvv-error').classList.contains('hidden') &&
            document.getElementById('cardholder-name-error').classList.contains('hidden')) {
            showNotification('Payment with Card processed!');
        }
    });

document.getElementById('paypal-button').addEventListener('click', () => showNotification('Payment with PayPal processed!'));
});