DOM Events

Question 1

Why do we log things to the console?

Answer 1

To test our code

Question 2

What is the purpose of events and event handling?

Answer 2

for user interaction

Question 3

What do [] square brackets mean in function and method syntax documentation?

Answer 3

It means that it’s optional

Question 4

What method of element objects lets you set up a function to be called when a specific type of event occurs?

Answer 4

.addeventlistener

Question 5

What is a callback function?

Answer 5

A callback function is a function passed into another function as an argument

Question 6

What object is passed into an event listener callback when the event fires?

Answer 6

The event object

Question 7

What is the event.target? If you weren’t sure, how would you check? Where could you get more information about it?

Answer 7

The target property of the Event interface is a reference to the object onto which the event takes place

debugger or documentation

MDN

Question 8

What is the difference between these two snippets of code?

element. addEventListener(‘click’, handleClick)
element. addEventListener(‘click’, handleClick())

Answer 8

The first is a call back function