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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';

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