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Editorial Team
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Asked: 2026-05-26T12:31:08+00:00

I was editing the default code from W3Schools, and it doesn’t work now. Can

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I was editing the default code from W3Schools, and it doesn’t work now. Can someone point out my error and why it will not update the text?

<html>
<head>
<script type="text/javascript">
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
 xmlhttp=new XMLHttpRequest();
}
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
 }
}

function switchText()
{loadXMLDoc()
xmlhttp.onreadystatechange=function()
  {
 if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
 }
}
xmlhttp.open("GET","ajax_info.txt",true);
xmlhttp.send();
}

</script>
</head>
<body>

<div id="myDiv"><h2>Let AJAX change this text</h2></div>
<button type="button" onclick="switchText()">Change Content</button>

 </body>
</html>
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1 Answer

  1. Editorial Team

    Your var = xmlhttp; is outside of switchText scope and so it’s undefined and throws an error.

    Try this 

    <html>
<head>
<script type="text/javascript">
var xmlhttp;
function loadXMLDoc()
{

if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
 xmlhttp=new XMLHttpRequest();
}
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
 }
}

function switchText()
{loadXMLDoc();
xmlhttp.onreadystatechange=function()
  {
 if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
 }
}
xmlhttp.open("GET","ajax_info.txt",true);
xmlhttp.send();
}

</script>
</head>
<body>

<div id="myDiv"><h2>Let AJAX change this text</h2></div>
<button type="button" onclick="switchText()">Change Content</button>

 </body>
</html>
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