AJAX response to the basic implementation of a simple example

Send requests for the page code
<html>
 <head>
  <title>ajax</title>
  <script language="javascript">
  /* Create a new XMLHttpRequest object to talk to the Web server */
	var xmlHttp = false; 
	try {
	  xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
	  try {
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	  } catch (e2) {
		xmlHttp = false;
	  }
	} 
	
	//Send AJAX requests 
	function callServer() 
	{
	  // Get the city and state from the web form
	  var city = document.getElementById("city").value; 
	  // Only go on if there are values for both fields
	  if ((city == null) || (city == "")) return; 
	  // Build the URL to connect to
	  var url = "returnvalue.txt";//Here is an XML file, a page, etc. 
	  // Open a connection to the server
	  xmlHttp.open("GET", url, true);
	  // Setup a function for the server to run when it's done
	  xmlHttp.onreadystatechange = updatePage;
	  // Send the request
	  xmlHttp.send(null);
	}
	
	function updatePage() 
	{
	  if (xmlHttp.readyState == 4) {
		var response = xmlHttp.responseText;
		document.getElementById("returnValue").value = response;
	}
}


</script>

 </head>
<body>
 	<input type="text">
	<input type="text">
</body>
</html>

The results of their implementation are the content of the text file back to the
<input type="text"> show
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