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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
80,986 Points
Martin Sole
Martin Sole
80,986 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.