adding a class to a element that's an immediate previous sibling

Question

Ive been struggling with everything in the DOM not sure what im doing wrong here. Please help

app.js

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

list.addEventListener('click', function(e) {
  if (e.target.tagName == 'BUTTON') {
     let p = e.target.parentNode;
     let sib = p.previousElementSibling;
     sib.className = 'sib';

  }
});

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>

Answer 1 · 2019-10-11T15:30:44Z

October 11, 2019 3:30pm

This worked for me.

e.target.previousElementSibling.className = "highlight";

You need to use the function e and turn the targeted (target) previous sibling (previousElementSibling) class name into "highlight".

Welcome to the Treehouse Community

Looking to learn something new?

Adil Ismaaeel

Adil Ismaaeel

adding a class to a element that's an immediate previous sibling

1 Answer

Armin Kadic

Armin Kadic