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 Interacting with the DOM Responding to Events Adding an Event Listener

Posted by Adlan Ilyasov
Adlan Ilyasov
2,476 Points

You didn't pass a function as the second agument to 'addEventListener'.

how do i pass a function to eventlistener?

app.js 
var warning = document.getElementById("warning");
var button = document.getElementById("makeItRed");
button.addEventListener('click');
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>

1 Answer

Steven Parker
Steven Parker
231,210 Points
Steven Parker
Steven Parker
231,210 Points

After a comma to separate it from the first argument, you can either put the name of an existing function or you can create an anonymous function expression. The latter is a popular use of "arrow" functions.

There are examples of this in the video lesson just prior to the challenge.