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 AJAX Basics Programming AJAX Create a callback

Posted by William Ray Noble
William Ray Noble
22,190 Points

Isn't this the event handler?

I thought this was how one completes this code. I'm not sure what I'm missing. Thanks in advance!

Ray

app.js 
var xhr = new XMLHttpRequest();
xhr.onreadystatechange();
xhr.open('GET', 'sidebar.html');
xhr.send();
index.html 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>AJAX with JavaScript</title>
  <script src="app.js"></script>
</head>
<body>
  <div id="main">
    <h1>AJAX!</h1>
  </div>
  <div id="sidebar"></div>
</body>
</html>

1 Answer

Steven Parker
Steven Parker
231,248 Points
Steven Parker
Steven Parker
231,248 Points

The task is not to call the method yourself, but to assign a function to it. For this particular exercise, the function assigned doesn't need to do anything:

xhr.onreadystatechange = function() { };