AJAX response to the basic implementation of a simple example
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<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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