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) Responding to User Interaction Listening for Events with addEventListener()

Kate C
Kate C
13,589 Points

Why my listItems are not changing toUpperCase and toLowerCase?

Hello treehouse residents!

i might be blind, couldn't see what's wrong with my code here:

https://imgur.com/a/HuVUSK0 https://codepen.io/bookmonster/pen/VwvBKJd?editors=1010

Please help

2 Answers

const listDiv = document.querySelector('.list');
//Getting elements by tag name it return html collection.
// in your code you just took the first element of index [0]
//const listItems = document.getElementsByTagName('li')[0];

const listItems = document.getElementsByTagName('li');
for (let i=0; i<listItems.length; i+=1){
  listItems[i].addEventListener ('mouseover', () => {
    listItems[i].textContent = listItems[i].textContent.toUpperCase();
  });
  listItems[i].addEventListener ('mouseout', () => {
    listItems[i].textContent = listItems[i].textContent.toLowerCase();
  });
}
Kate C
Kate C
13,589 Points

Thank you so much Mohammad!

You are welcome.

Keep it up :))