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
Aleksandra Milosavljevic
7,100 PointsSibling traversal
Just wondering why this code won't work and is it,at least, code for getting to the previousElementSibling right? Thanks.
const list = document.getElementsByTagName('ul')[0];
list.addEventListener('click', function(e) {
if (e.target.tagName == 'BUTTON') {
let li = list.parentNode;
let p = li.previousElementSibling;
p.className = 'hightlight';
}
});
<!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>
2 Answers
Steven Parker
231,269 PointsYou're close, but I see a few issues:
- the parent of the list would be the section
- you probably want the sibling of the button itself (e.target)
- you wrote "hightlight" (with an extra "t") instead of "highlight"
Sheila Anguiano
Full Stack JavaScript Techdegree Graduate 35,239 PointsI was stuck and I look another student's answer: " if(e.target.textContent.toLowerCase() === 'highlight') { let p = e.target.previousElementSibling; p.classList.add('highlight'); } } });"
That seem to complicated for me, but it help me understand the problem better, which is something similar to this: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_add_class
Thus I came up with my own solution which is just one long line of code in line 5: e.target.previousElementSibling.classList.add(‘highlight’);
Steven Parker
231,269 PointsGood job 