Need help debugging this...

Wuhtzu · April 9, 2007

Hey

I'm reading Sams Teach Yourself Ajax in 10 Minutes and I can't get the "Get server time without refreshing the page"-example to work even though my code is identical to the one in the book. Here are the files/scripts:

server_clock.php: The html/xml markup, <div>'s ect. to show the content (working)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
  
<head>
  <title>AJAX</title>
  <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" />
<link rel="stylesheet" type="text/css" href="style/server_clock.css" />
<script language="JavaScript" type="text/javascript" src="js/general.js"></script>
<script language="JavaScript" type="text/javascript" src="js/server_clock_functions.js"></script>

<script language="JavaScript" type="text/javascript">
	var http = getXMLHttpRequest();
</script>

</head>
  
<body>



<div id="container">

<h1>Server Clock</h1>
</h2>Get the server time without refreshing the page</h2>


<form>
	<input type="button" value="Get server time" onClick="getServerTime()" />
</form>

<br />

<div id="displaybox" class="displaybox"></div>

</div>

</body>

</html>

server_clock_functions.js: The two javascript functions used to get the server time and display it (some problem)

//Get the servertime
function getServerTime() {

var timestamp = new Date().getTime();

var requrl = "php/server_clock_script.php" + "?time=" + timestamp;

http.open("GET", requrl, true);
  http.onreadystatechange = displayServerTime;
  http.send(null);
}


//Use the server response
function displayServerTime() {

if(http.readyState == 4) {
	if(http.status == 200){
		var timeValue = http.responseXML.document.getElementByTagName('currenttime')[0];
		document.getElementById('displaybox').innerHTML = timeValue.childNodes[0].nodeValue;
	}
	else{
		alert("An error occured: " + http.statusText);
	}
}
else{
	document.getElementById('displaybox').innerHTML = '<img src="gfx/loading_circle40x40.gif">';
}
}

server_clock_script.php: The PHP script to return the server time (working)

<?PHP
header('Content-Type: text/xml');

$time = time();

echo "<?xml version='1.0' ?><time><currenttime>" . date("H:i:s",$time) . "</currenttime></time>"

?>

general.js: Function to create the XMLHTTPRequest object (working)

//getXMLHTTPRequest() - create an instance of the XMLHTTPRequest object
function getXMLHttpRequest() {

	var request = false;

	if(window.XMLHttpRequest)	{

			request = new XMLHttpRequest();

	}
	else if(window.ActiveXObject) {

			try {
					request = new ActiveXObject("Msm12.XMLHTTP");
			}
			catch(error1) {
					try {
							request = new ActiveXObject("Microsoft.XMLHTTP");
					}
					catch(error2) {
							request = false;
					}
			}
	}
	else {
			return false;
	}

	return request;

}

By inserting my own functions / code pieces into the code provided by "Sams Teach Yourself Ajax in 10 Minutes" I have found that my "getXMLHttpRequest()" and "getServerTime()" works, but displayServerTime doesn't, but I simple can't find the problem. Hopefully one of you guys can help me out....

The actual page / script can be view here:

Sams example: www.humlebo.org/ajax/ajaxfreakshelp/sams/Eksempel113.html

My code: www.humlebo.org/ajax/ajaxfreakshelp/wuhtzu/server_clock.php

Best regards

Wuhtzu

Wuhtzu · April 9, 2007

I kind of forgot to tell what the actual problem was...

When i hit the "Get server time"-button it sends the request correctly (checks out in both my apache log and with Firebug addon for FF) but it seems like "http.readystate == 4" never gets true and therefore it keeps on showing the loading gif. Btw. Firebug tells me that the readystate of the http-object is 4 :S

Wuhtzu · April 9, 2007

I found the bug my self, but thanks for looking at it though!

server_clock_functions.js:

//Use the server response

function displayServerTime() {

if(http.readyState == 4) {

if(http.status == 200){

var timeValue = http.responseXML.document.getElementByTagName('currenttime')[0];

var timeValue = http.responseXML.getElementsByTagName('currenttime')[0];

document.getElementById('displaybox').innerHTML = timeValue.childNodes[0].nodeValue;

}

else{

alert("An error occured: " + http.statusText);

}

else{

document.getElementById('displaybox').innerHTML = '<img src="gfx/loading_circle40x40.gif">';

}

The above color coded code pretty much shows what was wrong.

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