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See the raw classic Ajax Event (no jQuery)

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<!-- THE PHP SCRIPT NAMED my_parse_file.php -->

<?php 
echo 'Thank you '. $_POST['firstname'] . ' ' . $_POST['lastname'] . ', says the PHP file';
?>

<!-- THE HTML PAGE AND JAVASCRIPT -->

<html>
<head>
<script language="JavaScript" type="text/javascript">
function ajax_post(){
    // Create our XMLHttpRequest object
    var hr = new XMLHttpRequest();
    // Create some variables we need to send to our PHP file
    var url = "my_parse_file.php";
    var fn = document.getElementById("first_name").value;
    var ln = document.getElementById("last_name").value;
    var vars = "firstname="+fn+"&lastname="+ln;
    hr.open("POST", url, true);
    // Set content type header information for sending url encoded variables in the request
    hr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    // Access the onreadystatechange event for the XMLHttpRequest object
    hr.onreadystatechange = function() {
	    if(hr.readyState == 4 && hr.status == 200) {
		    var return_data = hr.responseText;
			document.getElementById("status").innerHTML = return_data;
	    }
    }
    // Send the data to PHP now... and wait for response to update the status div
    hr.send(vars); // Actually execute the request
    document.getElementById("status").innerHTML = "processing...";
}
</script>
</head>
<body>
<h2>Ajax Post to PHP and Get Return Data</h2>
Your First Name: <input id="first_name" name="first_name" type="text" /> 
<br /><br />
Your Last Name: <input id="last_name" name="last_name" type="text" />
<br /><br />
<input name="myBtn" type="submit" value="Submit Data" onClick="javascript:ajax_post();">
<br /><br />
<div id="status"></div>
</body>
</html>

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