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 Adding an Event Listener

Posted by OSMAN KAMARA
.a{fill-rule:evenodd;}techdegree seal-36
OSMAN KAMARA
Front End Web Development Techdegree Graduate 33,856 Points

I can't seem to be able to apply background-color without re-value the warning const.

https://teamtreehouse.com/library/javascript-and-the-dom-2/responding-to-user-interaction/adding-an-event-listener

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

2 Answers

Jennifer Nordell
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Hi there, Osman! I know that it can be tempting to think that you should use "background-color" because that's how we write it in CSS, right? But in JavaScript, what you're looking for is style.backgroundColor.

Hope this helps! :sparkles:

OSMAN KAMARA
.a{fill-rule:evenodd;}techdegree seal-36
OSMAN KAMARA
Front End Web Development Techdegree Graduate 33,856 Points

yea, it did. Thanks a bunch Jennifer!

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

In JavaScript, CSS property names use "camelCase".

:point_right: Also, you're missing the letter "r" in the name.

So instead of "backgound-color", you should write: "backgroundColor".