Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript AJAX Basics (retiring) Programming AJAX Check for the correct ready state

Karan kyanam
Karan kyanam
7,293 Points

Solution for code challenge

Is my code incomplete? Do I need to check the status of all other errors?

var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
if (xhr.readyState === 4 && status === 200)
xhr.open('GET', 'sidebar.html');
<!DOCTYPE html>
  <meta charset="utf-8">
  <title>AJAX with JavaScript</title>
  <script src="app.js"></script>
  <div id="main">
  <div id="sidebar"></div>

2 Answers

Ken Alger
Ken Alger
Treehouse Teacher


Yes, it is not complete. You need to include {} at the end of your if statement line, to include a place for what happens if your conditional returns true. Something along the lines of:

if (conditionalStatement) {
   //do something amazing in here

For Task 1 we aren't yet told what amazing thing we want to do, so we can leave it blank.

Happy coding and Happy Holidays,


Karan kyanam
Karan kyanam
7,293 Points

Thank you. Got confused with that. Also typed in status instead of xhr.status. Happy holidays to you too.