React Form Validation MCQ Form Validation Practice Questions

Direction: Choose the correct option

Where should form validation logic typically reside in React?

A. In a separate validation function called on submit or on change

B. In the render method

C. In the form's onChange handler

D. In the global scope

Direction: Choose the correct option

How can you display validation errors to the user?

A. By modifying the DOM directly

B. Using console.log

C. By setting error messages in state and rendering them conditionally

D. Using alert()

Direction: Choose the correct option

What is a common library for form validation in React?

A. Formik

B. Axios

C. Redux

D. React Router

Direction: Choose the correct option

In a controlled component, when is a good time to validate?

A. On every change, on blur, or on submit depending on UX

B. Only on submit

C. Never

D. Only on mount

Direction: Choose the correct option

What does the 'required' attribute do in a form input?

A. It makes the field mandatory in HTML5 validation

B. It updates React state

C. It throws an error in React

D. It disables the input

Quipoin Menu