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

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

I believe that I only have part of the puzzle here, not sure what to do next. Any contribution would be greatly appreciated.

app.js
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() { if (xhr.readystate===4&& xhr.status===200){

};
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>

5 Answers

Kelly von Borstel
Kelly von Borstel
28,880 Points

The code is missing closing bracket after function, and readystate should be readyState, with uppercase S -- like this:

var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() { 
  if (xhr.readyState === 4 && xhr.status === 200) {
  };
};
xhr.open('GET', 'sidebar.html');
xhr.send();

Hello Kelly,

Thank you for this response, it was very helpful! I wasn't paying close enough attention to the event handler. Thanks again!

Justin

Tom Nguyen
Tom Nguyen
33,499 Points

This is what I used to pass the challenge

app.js
var xhr = new XMLHttpRequest();
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4){  // 4 means the readystate has send everything that it will send
      if (xhr.status === 200){
        document.getElementById('sidebar').innerHTML = xhr.responseText;
      }
    }
};
xhr.open('GET', 'sidebar.html');
xhr.send();
Volodymyr Rusnyk
Volodymyr Rusnyk
9,657 Points

ar xhr = new XMLHttpRequest(); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { }; xhr.open('GET', 'sidebar.html'); xhr.send();

I wrote the same code and it doesn’t work. It shows: Bummer: There was an error with your code: SyntaxError: Parse error What is wrong with code?

var xhr = new XMLHttpRequest(); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) {

};

xhr.open('GET', 'sidebar.html'); xhr.send(); };

Raynaldo Joseph
Raynaldo Joseph
8,187 Points

var xhr = new XMLHttpRequest(); xhr.onreadystatechange = function() { if (xhr.readyState === 4) { if (xhr.status === 200) { } }; }; xhr.open('GET', 'sidebar.html'); xhr.send();