<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Windjammer Form Validation</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
min-height: 100vh;
display: flex;
justify-content: center;
align-items: center;
padding: 20px;
}
.container {
background: white;
border-radius: 12px;
box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
max-width: 500px;
width: 100%;
padding: 40px;
}
h1 {
color: #333;
margin-bottom: 30px;
font-size: 28px;
text-align: center;
}
.form-group {
margin-bottom: 20px;
}
label {
display: block;
margin-bottom: 8px;
color: #555;
font-weight: 600;
font-size: 14px;
}
input, textarea {
width: 100%;
padding: 12px 16px;
border: 2px solid #e0e0e0;
border-radius: 8px;
font-size: 16px;
font-family: inherit;
transition: border-color 0.3s;
}
input:focus, textarea:focus {
outline: none;
border-color: #667eea;
}
input.error, textarea.error {
border-color: #dc3545;
}
input.valid, textarea.valid {
border-color: #28a745;
}
.error-message {
color: #dc3545;
font-size: 13px;
margin-top: 6px;
display: none;
}
.error-message.show {
display: block;
}
.success-message {
color: #28a745;
font-size: 13px;
margin-top: 6px;
display: none;
}
.success-message.show {
display: block;
}
button {
width: 100%;
padding: 14px;
background: #667eea;
color: white;
border: none;
border-radius: 8px;
font-size: 16px;
font-weight: 600;
cursor: pointer;
transition: background 0.3s;
margin-top: 10px;
}
button:hover:not(:disabled) {
background: #5568d3;
}
button:disabled {
background: #ccc;
cursor: not-allowed;
}
.success-banner {
background: #d4edda;
border: 2px solid #28a745;
color: #155724;
padding: 16px;
border-radius: 8px;
margin-bottom: 20px;
display: none;
text-align: center;
font-weight: 600;
}
.success-banner.show {
display: block;
}
.char-count {
font-size: 12px;
color: #999;
text-align: right;
margin-top: 4px;
}
.char-count.warning {
color: #ff9800;
}
.char-count.error {
color: #dc3545;
}
</style>
</head>
<body>
<div class="container">
<h1>📋 Registration Form</h1>
<div class="success-banner" id="success-banner">
✅ Form submitted successfully!
</div>
<form id="registration-form">
<div class="form-group">
<label for="username">Username *</label>
<input type="text" id="username" placeholder="Choose a username" />
<div class="error-message" id="username-error"></div>
<div class="success-message" id="username-success">✓ Username available</div>
</div>
<div class="form-group">
<label for="email">Email *</label>
<input type="email" id="email" placeholder="your@email.com" />
<div class="error-message" id="email-error"></div>
<div class="success-message" id="email-success">✓ Valid email</div>
</div>
<div class="form-group">
<label for="password">Password *</label>
<input type="password" id="password" placeholder="At least 8 characters" />
<div class="error-message" id="password-error"></div>
<div class="success-message" id="password-success">✓ Strong password</div>
</div>
<div class="form-group">
<label for="confirm-password">Confirm Password *</label>
<input type="password" id="confirm-password" placeholder="Re-enter password" />
<div class="error-message" id="confirm-password-error"></div>
<div class="success-message" id="confirm-password-success">✓ Passwords match</div>
</div>
<div class="form-group">
<label for="bio">Bio (optional)</label>
<textarea id="bio" rows="4" placeholder="Tell us about yourself..." maxlength="200"></textarea>
<div class="char-count" id="char-count">0 / 200</div>
</div>
<button type="submit" id="submit-btn" disabled>Submit</button>
</form>
</div>
<script>
const form = document.getElementById('registration-form');
const username = document.getElementById('username');
const email = document.getElementById('email');
const password = document.getElementById('password');
const confirmPassword = document.getElementById('confirm-password');
const bio = document.getElementById('bio');
const submitBtn = document.getElementById('submit-btn');
const successBanner = document.getElementById('success-banner');
const charCount = document.getElementById('char-count');
const validators = {
username: (value) => {
if (!value) return 'Username is required';
if (value.length < 3) return 'Username must be at least 3 characters';
if (!/^[a-zA-Z0-9_]+$/.test(value)) return 'Username can only contain letters, numbers, and underscores';
return null;
},
email: (value) => {
if (!value) return 'Email is required';
if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value)) return 'Invalid email format';
return null;
},
password: (value) => {
if (!value) return 'Password is required';
if (value.length < 8) return 'Password must be at least 8 characters';
if (!/[A-Z]/.test(value)) return 'Password must contain an uppercase letter';
if (!/[a-z]/.test(value)) return 'Password must contain a lowercase letter';
if (!/[0-9]/.test(value)) return 'Password must contain a number';
return null;
},
confirmPassword: (value) => {
if (!value) return 'Please confirm your password';
if (value !== password.value) return 'Passwords do not match';
return null;
}
};
function validateField(field, validatorKey) {
const value = field.value;
const error = validators[validatorKey](value);
const errorEl = document.getElementById(`${field.id}-error`);
const successEl = document.getElementById(`${field.id}-success`);
if (error) {
field.classList.add('error');
field.classList.remove('valid');
errorEl.textContent = error;
errorEl.classList.add('show');
successEl.classList.remove('show');
return false;
} else {
field.classList.remove('error');
field.classList.add('valid');
errorEl.classList.remove('show');
if (value) successEl.classList.add('show');
return true;
}
}
function checkFormValidity() {
const isValid =
validateField(username, 'username') &&
validateField(email, 'email') &&
validateField(password, 'password') &&
validateField(confirmPassword, 'confirmPassword');
submitBtn.disabled = !isValid;
}
username.addEventListener('input', () => {
validateField(username, 'username');
checkFormValidity();
});
email.addEventListener('input', () => {
validateField(email, 'email');
checkFormValidity();
});
password.addEventListener('input', () => {
validateField(password, 'password');
if (confirmPassword.value) {
validateField(confirmPassword, 'confirmPassword');
}
checkFormValidity();
});
confirmPassword.addEventListener('input', () => {
validateField(confirmPassword, 'confirmPassword');
checkFormValidity();
});
bio.addEventListener('input', () => {
const length = bio.value.length;
charCount.textContent = `${length} / 200`;
if (length > 180) {
charCount.classList.add('error');
charCount.classList.remove('warning');
} else if (length > 150) {
charCount.classList.add('warning');
charCount.classList.remove('error');
} else {
charCount.classList.remove('warning', 'error');
}
});
form.addEventListener('submit', (e) => {
e.preventDefault();
successBanner.classList.add('show');
form.reset();
submitBtn.disabled = true;
[username, email, password, confirmPassword].forEach(field => {
field.classList.remove('valid', 'error');
document.getElementById(`${field.id}-error`).classList.remove('show');
document.getElementById(`${field.id}-success`).classList.remove('show');
});
charCount.textContent = '0 / 200';
charCount.classList.remove('warning', 'error');
setTimeout(() => {
successBanner.classList.remove('show');
}, 3000);
});
</script>
</body>
</html>