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

Posted by Thomas Katalenas
Thomas Katalenas
11,033 Points

the if statement, xhr.readyState

helo

app.js 
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
    if(xhr.readyState = 4){
    }else{
      false;
    };
};
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

Alex Lewis
Alex Lewis
15,619 Points
Alex Lewis
Alex Lewis
15,619 Points

I'm not exactly sure what your question is, but your if statement contains an assignment and not an equality check. Use 

===

for equality.