Learn JavaScript from Scratch JavaScript for Everyone - Selecting Multiple DOM Nodes

The video tutorial covers selecting HTML elements by class using JavaScript, focusing on the use of querySelector and querySelectorAll. It explains the concept of node lists and demonstrates how to loop through elements to modify their properties. The tutorial also discusses using indexes in loops and dynamically adding classes to elements. The session concludes with a brief introduction to methods and functions in JavaScript.

What is a potential risk when selecting elements by class in JavaScript?

• Selecting elements by class is always safe.

• It may select multiple elements unintentionally.

• It only selects the first element.

• It does not work with CSS.

Which method would you use to select all elements with a specific class?

• document.getElementById

• document.querySelector

• document.querySelectorAll

• document.getElementsByTagName

What does the querySelector method return?

• An array of elements

• A string of element IDs

• The first matching element

• A list of all matching elements

How can you loop through a node list in JavaScript?

• Using a map function

• Using a forEach method

• Using a while loop

• Using a filter method

What is the purpose of using a template literal in JavaScript?

• To create arrays

• To write CSS

• To embed expressions within strings

• To define functions

What is the difference between a method and a function in JavaScript?

• Functions are only used in CSS.

• Methods are attached to objects, functions are not.

• Methods can only be used with arrays.

• Functions are faster than methods.

How can you dynamically add a class to an HTML element using JavaScript?

• Using element.innerHTML

• Using element.classList.add

• Using element.style

• Using element.getAttribute