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 Callback Functions in JavaScript Callbacks and the DOM Callbacks with DOM Elements

I couldn't find the error , can Anyone help me?

We have a page with 3 buttons. Our goal is to apply the spinElement callback to btn1, btn2, and btn3. The spinElement function should be triggered on the click event. Modify the code in the app.js file to add the event listener to every button.

app.js
const btn1 = document.getElementById("button1");
const btn2 = document.getElementById("button2");
const btn3 = document.getElementById("button3");

function spinElement(event) {
  //Applies spinning animation to button element
  event.target.className = "spin";
}


btn1.addEventElement('click', spinElement);
btn2.addEventElement('click', spinElement);
btn3.addEventElement('click', spinElement);
index.html
<!DOCTYPE html>
<html lang="en">
    <head>
        <title></title>
        <link rel='stylesheet' href='styles.css'>
    </head>
    <body>
        <section >
            <button id='button1'>Button 1</button>
            <button id='button2'>Button 2</button>
            <button id='button3'>Button 3</button>
        </section>
        <script src='app.js'></script>
    </body>
</html>

2 Answers

Hi Khumoyunmirzo, you should be using the addEventListener method to add callback functions to HTML elements:

btn1.addEventListener('click', spinElement);

What did I do?

Khumoyunmirzo, you were using addEventElement instead of addEventListener.

thank you soooo much , you really helped me!

No problem - could you please select my answer as the correct answer for this question? Thanks!