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 Check for the correct ready state

Posted by Jonathan Ambriz
Jonathan Ambriz
Courses Plus Student 3,902 Points

Add a conditional statement inside the onreadystatechange event handler that tests to make sure the server has sent back

Parse Error keeps showing up.

Not sure what I'm missing here.

app.js 
var xhr = new XMLHttpRequest();
xhr.onReadyStateChange = function(xhr.readyState === 4) {
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

Martin Sole
Martin Sole
82,199 Points
Martin Sole
Martin Sole
82,199 Points

Hi You are using the correct xhr.readystate check, but you are passing it as an argument to the onReadyStateChange function rather than using it with an if statement inside the function, which is what the challenge is requiring. Also xhr.open and xhr.send need to remain outside of the function.