Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript and the DOM (Retiring) Traversing the DOM Sibling Traversal

Complete the code to add a class of highlight to a <p> element that's an immediate previous sibling of the button being

var list = document.getElementsByTagName('ul')[0];

list.addEventListener('click', function(e) { if (e.target.tagName == 'BUTTON') { list.parentNode.nextSibling; list.style.className = "highlight"; console.log(list);

} });

<!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>Element Selection</p><button>Highlight</button></li> <li><p>Events</p><button>Highlight</button></li> <li><p>Event Listening</p><button>Highlight</button></li> <li><p>DOM Traversal</p><button>Highlight</button></li> </ul> </section> <script src="app.js"></script> </body> </html>

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

list.addEventListener('click', function(e) {
  if (e.target.tagName == 'BUTTON') {
   list.parentNode.nextSibling;
     list.style.className = "highlight";
       console.log(list);


  }
});
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>Element Selection</p><button>Highlight</button></li>
                <li><p>Events</p><button>Highlight</button></li>
                <li><p>Event Listening</p><button>Highlight</button></li>
                <li><p>DOM Traversal</p><button>Highlight</button></li>
            </ul>
        </section>
        <script src="app.js"></script>
    </body>
</html>

1 Answer

Steven Parker
Steven Parker
231,248 Points

You won't need to reference the parent here, the paragraph is a sibling of the button. You also won't need to reference the "list" element, you can use traversal with the button as the reference.

And remember, it's the paragraph you want to change the class on, not the list.

And you won't need to "log" anything for the challenge.