Lecture 18 Quiz: Conditions & Looping in JavaScript

Note

Review before quiz: Lectures | Week 5 Content | Lab 5 | Home Assignment 2

Lecture 18 Self-Check

Question 1: Which HTML attribute prevents form submission when a field is empty?

Select an item

A. placeholder

B. required

C. checked

D. readonly

Question 2: The pattern attribute in HTML form validation uses:

Select an item

A. CSS selectors

B. SQL clauses

C. Regular expressions

D. JSON objects

Question 3: What does e.preventDefault() do in a submit handler?

Select an item

A. It saves form data automatically

B. It stops the browser's default submit action

C. It resets all form fields

D. It creates a new form element

Question 4: Which event commonly fires when an input loses focus and is useful for real-time validation?

Select an item

A. submit

B. change

C. blur

D. load

Question 5: What is the main role of a validation regular expression for email input?

Select an item

A. It checks if a value matches a required format

B. It converts HTML into CSS

C. It creates a database table

D. It compresses JavaScript