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JavaScript AJAX Basics Programming AJAX Create a callback

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

Hi Niki,

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