dom events

Question 1

What is the purpose of events and event handling?

Answer 1

to react to changes on the page and run code based on user input/interaction

Question 2

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

Answer 2

no

Question 3

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

Answer 3

addEventListener(‘event’, callbackFunction)

Question 4

What is a callback function?

Answer 4

a function that is passed as an argument to another function, and called by an event or something else later

Question 5

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

Answer 5

event

Question 6

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

Answer 6

the element that triggered the event. console.log it!

Question 7

What is the difference between these two snippets of code?

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

Answer 7

the second one is passing a function CALL, not just the function. This callback will run prematurely