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

Niki kalwar
Niki kalwar
1,892 Points
Posted by Niki kalwar
Niki kalwar
1,892 Points

getting error as left assignment operator

I am not able to add function to the onreadystatechange event handler

app.js 
var xhr = new XMLHttpRequest();
xhr.onreadystatechange()=function(){};
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

Helari Sosi
Helari Sosi
6,168 Points
Helari Sosi
Helari Sosi
6,168 Points

Hi Niki,

You are really close, try it without the parenthesis at the end of the onreadystatechange.