Dom-Events

Question 1

What is the purpose of events and event handling?

Answer 1

Events and event handling allow for certain elements within the HTML doc to be manipulated by user actions while on the webpage.

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

Question 4

What is a callback function?

Answer 4

A callback function is a function that is passed as an argument of another function. The callback function is executed inside the other one.

Question 5

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

Answer 5

an object with a handleEvent() method, or a JavaScript function

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

even.target is a reference to the object that the event is acting on. You can check by testing the property in the console or read more about it on MDN

Question 7

What is the difference between these two snippets of code?

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

Answer 7

handleClick in the second line is being called.