DOM Events

Question 1

Why do we log things to the console?

Answer 1

method for developers to write code to inconspicuously inform the developers what the code is doing

Question 2

What is the purpose of events and event handling?

Answer 2

Events are signals fired inside the browser window that notify of changes in the browser or operating system environment

Question 3

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

Answer 3

not all possible parameters are needed

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

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

The event object is passed through.

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 event.target is the specific element we clicked on. is the console.log(). look it up on mdm

Question 8

What is the difference between these two snippets of code?
element.addEventListener(‘click’, handleClick)
element.addEventListener(‘click’, handleClick())

Answer 8

first is being called as a calledback function so it just waits to be loaded
second one is being called immediately so it just fires as soon as the page loads.