Category: javascript
Form validation
Published on 16 Jul 2026
Explanation
Form validation checks user input before submitting data.
Code:
if(name === '') {
alert('Name required');
}
Explanation
The value property retrieves user input.
Code:
const email = document.getElementById('email').value;
Explanation
Regular expressions validate formats such as email addresses.
Code:
const pattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
Explanation
preventDefault() stops form submission if validation fails.
Code:
event.preventDefault();
Explanation
Display validation messages to guide users.
Code:
error.textContent = 'Invalid Email';