JavaScript JavaScript and the DOM Traversing the DOM Sibling Traversal

Who Can help me ?

I don't understand what to do?

app.js
var list = document.getElementsByTagName('ul')[0];
var p = list.previousElementSibling;

list.addEventListener('click', function(e) {
  if (e.target.tagName == 'BUTTON') {

  }
});
index.html
<!DOCTYPE html>
<html>
    <head>
        <title>JavaScript and the DOM</title>
    </head>
    <link rel="stylesheet" href="style.css" />
    <body>
        <section>
            <h1>Making a Webpage Interactive</h1>
            <p>Things to Learn</p>
            <ul>
                <li><p class = 'highlight'>Element Selection</p><button>Highlight</button></li>
                <li><p class = 'highlight'>Events</p><button>Highlight</button></li>
                <li><p class = 'highlight'>Event Listening</p><button>Highlight</button></li>
                <li><p class = 'highlight'>DOM Traversal</p><button>Highlight</button></li>
            </ul>
        </section>
        <script src="app.js"></script>
    </body>
</html>

1 Answer

Steven Parker
Steven Parker
200,698 Points

Your task is to navigate to the paragraph which is a sibling of the button. And the code that does this needs to be inside the conditional statement body (between the braces).

Then, you will apply the class of "highlight" to that paragraph.