dom-events

Question 1

Why do we log things to the console?

Answer 1

1. verify what the code is doing

2. debugging

Question 2

What is the purpose of events and event handling?

Answer 2

An event indicates that an action is taking place. The event handler deals with the event.

Question 3

Are all possible parameters required to use a JavaScript method or function?

Answer 3

-no

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, which is then invoked inside the outer function to complete some kind of routine or action.

Question 6

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

Answer 6

-event

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

• It is a property of an event which is a reference to the element upon which the event was fired.
• In the listener parameter, console.log(event.target)
• When the event is fired, check the console to get the details of MDN.

Question 8

What is the difference between these two snippets of code?

Answer 8

The first will call the function when the event happens. The second will call the function when the page loads.