JavaScript Events

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Question 1

Which method is used to attach an event listener to an element?

A
addEvent()
B
addEventListener()
C
attachListener()
D
onEvent()

Question 2

What event is triggered when a user clicks on an element?

A
change
B
mouseover
C
click
D
keydown

Question 3

Which method prevents the default behavior of an event?

A
stopDefault()
B
preventDefault()
C
cancelDefault()
D
stopPropagation()

Question 4

What is event delegation?

A
Adding multiple event listeners to child elements
B
Using a single event listener on a parent element to handle events on its child elements
C
Delaying an event listener
D
Removing an event listener

Question 5

Which property determines the type of event that was triggered?

A
event.type
B
event.name
C
event.trigger
D
event.value

Question 6

What is the difference between event.target and event.currentTarget?

A
event.target refers to the element that triggered the event, while event.currentTarget refers to the element the event listener is attached to
B
Both refer to the element that triggered the event
C
event.target refers to the event listener, while event.currentTarget refers to the triggering element
D
Both refer to the parent element of the triggering element

Question 7

What is the purpose of throttling in event handling?

A
To execute an event listener only once
B
To control the frequency of event execution
C
To cancel an event listener
D
To delay event execution indefinitely

Question 8

Which event is fired when a key is pressed down?

A
keyup
B
keydown
C
keypress
D
keychange

Question 9

What does stopPropagation() do?

A
Prevents the default action of an event
B
Cancels the current event
C
Delays the event execution
D
Stops the event from bubbling up or down the DOM hierarchy

Question 10

What is the output of the following code?

JavaScript

document.addEventListener("click", () => {
    console.log("Document clicked");
});
document.body.addEventListener("click", () => {
    console.log("Body clicked");
});

A
Document clicked
B
Body clicked
C
Body clicked, Document clicked
D
Document clicked, Body clicked

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