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

Posted by zkb
.a{fill-rule:evenodd;}techdegree seal-36
zkb
Front End Web Development Techdegree Graduate 13,636 Points

Where am I going wrong with my code???

I don't get this at all. I've checked everything and the useless hint only asks me if I've applied the event listener to btn1, which doesn't help one bit. Does anybody know what I did wrong? I'm totally lost here.

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.addEventListener = ('click', event => {
  spinElement(event)
});

btn2.addEventListener = ('click', event => {
  spinElement(event)
});

btn3.addEventListener = ('click', event => {
  spinElement(event)
});
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>

1 Answer

Bella Bradbury
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Bella Bradbury
Front End Web Development Techdegree Graduate 32,790 Points
Bella Bradbury
.a{fill-rule:evenodd;}techdegree seal-36
Bella Bradbury
Front End Web Development Techdegree Graduate 32,790 Points

You're so close! The only thing that you need to modify for each event listener is to take out the = between addEventListner and ('click'.... Remember that you're using a method on variables that have already been assigned at the top of the code.

Here is a link to the relevant w3schools page if you're interested in reading more about the syntax of addEventListner. Happy coding!

zkb
.a{fill-rule:evenodd;}techdegree seal-36
zkb
Front End Web Development Techdegree Graduate 13,636 Points

Thank you! I can't believe I didn't notice that after all the times I looked over it.