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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>Form Validation</title> | |
<style> | |
body { | |
font-family: Arial, sans-serif; | |
max-width: 500px; | |
margin: 0 auto; | |
padding: 20px; | |
} | |
.form-group { | |
margin-bottom: 15px; | |
} | |
label { | |
display: block; | |
margin-bottom: 5px; | |
font-weight: bold; | |
} | |
input { | |
width: 100%; | |
padding: 8px; | |
box-sizing: border-box; | |
border: 1px solid #ccc; | |
border-radius: 4px; | |
} | |
button { | |
background-color: #4CAF50; | |
color: white; | |
padding: 10px 15px; | |
border: none; | |
border-radius: 4px; | |
cursor: pointer; | |
font-size: 16px; | |
} | |
button:hover { | |
background-color: #45a049; | |
} | |
.error { | |
color: red; | |
font-size: 14px; | |
margin-top: 5px; | |
} | |
</style> | |
</head> | |
<body> | |
<h1>Registration Form</h1> | |
<form id="myForm"> | |
<div class="form-group"> | |
<label for="name">Name*:</label> | |
<input type="text" id="name" name="name"> | |
<div id="nameError" class="error"></div> | |
</div> | |
<div class="form-group"> | |
<label for="email">Email*:</label> | |
<input type="text" id="email" name="email"> | |
<div id="emailError" class="error"></div> | |
</div> | |
<div class="form-group"> | |
<label for="age">Age:</label> | |
<input type="number" id="age" name="age"> | |
<div id="ageError" class="error"></div> | |
</div> | |
<button type="submit">Submit</button> | |
</form> | |
<script> | |
document.getElementById('myForm').addEventListener('submit', function(event) { | |
// Prevent form submission | |
event.preventDefault(); | |
// Get form values | |
const name = document.getElementById('name').value.trim(); | |
const email = document.getElementById('email').value.trim(); | |
const age = document.getElementById('age').value.trim(); | |
// Reset error messages | |
document.getElementById('nameError').textContent = ''; | |
document.getElementById('emailError').textContent = ''; | |
document.getElementById('ageError').textContent = ''; | |
let isValid = true; | |
// Validate name | |
if (name === '') { | |
document.getElementById('nameError').textContent = 'Name is required'; | |
isValid = false; | |
} | |
// Validate email | |
if (email === '') { | |
document.getElementById('emailError').textContent = 'Email is required'; | |
isValid = false; | |
} else if (!email.includes('@')) { | |
document.getElementById('emailError').textContent = 'Email must contain @'; | |
isValid = false; | |
} | |
// Validate age | |
if (age !== '') { | |
const ageNum = Number(age); | |
if (isNaN(ageNum) || ageNum <= 0) { | |
document.getElementById('ageError').textContent = 'Age must be a number greater than 0'; | |
isValid = false; | |
} | |
} | |
// If all valid, show success message | |
if (isValid) { | |
alert('Form submitted!'); | |
// You could also submit the form to a server here with: | |
// this.submit(); | |
} | |
}); | |
</script> | |
</body> | |
</html> |
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