JavaScript - Forms API

Overview

Estimated time: 10–15 minutes

The Forms API provides methods and properties for working with forms, inputs, and validation in JavaScript.

Learning Objectives

• Access and manipulate form elements.
• Validate form data using JavaScript.

Prerequisites

• JavaScript - IndexedDB

Accessing Form Elements

const form = document.forms['myForm'];
const input = form.elements['username'];

Form Validation

if (!input.value) {
  input.setCustomValidity('Username required');
}

Common Pitfalls

• Always validate on both client and server for security.

Summary

The Forms API is essential for interactive, user-friendly forms in web applications.