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

suraj Singh
suraj Singh
2,346 Points
Posted by suraj Singh
suraj Singh
2,346 Points

Classname her means like an id attached to the p tag

I just wanted to know that the output should look like this <li><p class="highlight">xx</p><button>xx</button></li> when i click on the button.

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

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

     e.target.className = 'highlight';
  }

});
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
229,785 Points
Steven Parker
Steven Parker
229,785 Points

You are correct that the code should apply the class to the paragraph, but it currently applies the class to the button itself.

But you're close, and with a small change to the code you can apply the class to the paragraph instead.

suraj Singh
suraj Singh
2,346 Points
suraj Singh
suraj Singh
2,346 Points

Thanks Steven, finally i was able to solve it.

e.target.previousElementSibling.className = "highlight"; console.log(e.target.previousElementSibling);