Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript JavaScript and the DOM (Retiring) Responding to User Interaction Adding an Event Listener

Nazeim Brame
Nazeim Brame
6,544 Points

Not sure how to add a red background to the waring variable

*warning variable

var warning = document.getElementById("warning");
var button = document.getElementById("makeItRed");
button.addEventListener('click', () => {
  warning.color = red;
<!DOCTYPE html>
        <title>Adding an Event Listener</title>
    <link rel="stylesheet" href="style.css" />
        <div id="warning">
            Warning: My background should be red!
        <button id="makeItRed">Make It Red!</button>
        <script src="app.js"></script>

1 Answer

12,834 Points

You're close! Just keep in mind that in Javascript, your CSS properties use camel case. So you want to refer to background-color, but in JS it would read: warning.backgroundColor = 'red';

I tried that change and cleared the challenge with your code! I also added the quotes around the 'red' since it's a good habit to get into.