Chrome extension: onclick() event is not triggering an alert() popup [duplicate]

Answer 1

Don't use inline JavaScript code in a Google Chrome extension.

HTML:

<div class="plus"></div>
<script src="inline.js"></script>

JavaScript:

function popup(e) {
  var link = document.URL;
  alert("This is the link: (" + link + ")");
}

var plusBtn = document.querySelector('.plus');
plusBtn.addEventListener('click', popup);