How do you put an alert on "click" of a button?

Question

https://code.sololearn.com/WLs156zQ9Urk/?ref=app

Answer 1

There are at least 2 ways (see Javascript course, lesson 50)

A) Put the function directly onto the html button element
<button id="btn1" onclick="alert('Click 1')">Button 1</button>

B) Add the function to the button via Javascript: When the DOM is completely loaded, we get the html element in Javascript and add the event listener for "click" with the function.

Answer 2

But right under the button's code?

Answer 3

https://code.sololearn.com/WZgQ7VDG70aH/?ref=app

You have forgotten to add callback function to the addEventListener function