Master Event Handling and DOM Manipulation for Dynamic Web Development

Question 1

To change the content of an HTML element using DOM manipulation, which method is employed?

Accepted Answer

innerHTML()

Answer

getElementById()

Answer

createElement()

Answer

appendChild()

Question 2

To prevent a form from submitting when the user presses the Enter key, which attribute should be used?

Accepted Answer

novalidate

Answer

onkeypress

Answer

onsubmit

Answer

autocomplete

Question 3

In an event handler, what is the purpose of the 'this' keyword?

Accepted Answer

To reference the element that initiated the event

Answer

To reference the event object

Answer

To reference the global object

Answer

To reference the window object

Question 4

Which method is used to create a new element in the DOM?

Accepted Answer

document.createElement()

Answer

document.createTextNode()

Answer

document.getElementById()

Answer

document.appendChild()

Question 5

Which event listener is used to detect a left mouse button click on an element?

Accepted Answer

onclick

Answer

onmouseover

Answer

onchange

Answer

onkeypress

Question 6

To retrieve an element with a specified ID from the DOM, which method is used?

Accepted Answer

getElementById

Answer

getElementByID

Answer

querySelector

Answer

getElementByTagName

Question 7

Which property is used to set the CSS style of an element?

Accepted Answer

style

Answer

classList

Answer

attributes

Answer

className

Question 8

In an event listener function, what is the purpose of the 'e' parameter?

Accepted Answer

To hold the event object

Answer

To hold the target element

Answer

To hold the event type

Answer

To hold the event data

Question 9

Which JavaScript method can be used to add a new child element to an existing DOM element?

Accepted Answer

appendChild

Answer

insertBefore

Answer

insertAdjacentElement

Answer

addChild

Question 10

What is the distinction between the 'innerHTML' and 'textContent' properties?

Accepted Answer

innerHTML includes HTML tags, but textContent does not.

Answer

textContent includes HTML tags, but innerHTML does not.

Answer

They are equivalent properties with different names.

Answer

innerHTML is read-only, but textContent can be edited.

Question 11

What is the purpose of using 'event.preventDefault()'?

Accepted Answer

To stop the default behavior of an event

Answer

To halt event propagation

Answer

To capture an event

Answer

To bubble up an event

Question 12

Which method listens for changes to the 'value' property of an input element?

Accepted Answer

oninput

Answer

onchange

Answer

onkeypress

Answer

onkeyup

Question 13

In AJAX, what is the function of the 'readystatechange' event?

Accepted Answer

To indicate the progress of an HTTP request

Answer

To handle server responses

Answer

To parse JSON data

Answer

To send HTTP requests

Question 14

Which event is triggered when the DOM has finished loading?

Accepted Answer

onload

Answer

onready

Answer

oncomplete

Answer

onfinish

Question 15

Which event listener method is used specifically to capture mouse clicks?

Accepted Answer

onclick()

Answer

onkeypress()

Answer

onhover()

Answer

onscroll()

Question 16

In the context of the DOM, what is the primary purpose of the 'parentNode' property?

Accepted Answer

To access the parent element of a specified node

Answer

To add a new child element to a specified node

Answer

To remove a child element from a specified node

Answer

To retrieve the text content of a specified node

Question 17

Which method is specifically used to modify the inner HTML content of an element?

Accepted Answer

innerHTML

Answer

outerHTML

Answer

getElementByTagName()

Answer

setAttribute()

Question 18

Explain the key difference between capturing and bubbling in the context of event propagation.

Accepted Answer

Capturing occurs before the event reaches the target element, while bubbling occurs after the event has reached the target element.

Answer

Bubbling occurs before the event reaches the target element, while capturing occurs after the event has reached the target element.

Answer

Capturing and bubbling occur simultaneously.

Answer

Capturing prevents the event from reaching the target element.

Question 19

Which of the following is considered a best practice for efficient event handling in web development?

Accepted Answer

Utilize event delegation to minimize the number of event listeners required.

Answer

Add event listeners directly to each element that requires event handling.

Answer

Assign the same event listener to multiple elements to simplify code.

Answer

Avoid using event listeners and rely solely on inline event handlers.

Question 20

In HTML, which element is primarily used to denote an active link?

Accepted Answer

a

Answer

button

Answer

input

Answer

form

Question 21

Provide the correct syntax for adding an event listener to an element using JavaScript.

Accepted Answer

element.addEventListener(eventType, eventHandler)

Answer

element.attachEventListener(eventType, eventHandler)

Answer

element.addEvent(eventType, eventHandler)

Answer

element.addEventListener(eventHandler, eventType)

Question 22

Which of the following is NOT considered an advantage of DOM manipulation in web development?

Accepted Answer

Increased code complexity

Answer

Enhanced user interactivity

Answer

Dynamic and responsive page content

Answer

Reduced server load

Question 23

Describe the key difference between the 'getElementById()' and 'querySelector()' methods in JavaScript.

Accepted Answer

getElementById() retrieves an element by its unique ID, while querySelector() retrieves an element based on a specified selector.

Answer

querySelector() retrieves an element by its unique ID, while getElementById() retrieves an element based on a specified selector.

Answer

getElementById() and querySelector() perform the same task.

Answer

getElementById() is significantly faster than querySelector().