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

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


const warning = document.getElementById("warning");
let button = document.querySelector('#makeItRed');
button.addEventListener('click', () => {
warning.style.backgound-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>

2 Answers

Jennifer Nordell
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:

yea, it did. Thanks a bunch Jennifer!

Steven Parker
Steven Parker
228,095 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".