Ajax loop question

mrcheeky

New Member

Join Date: Sep 2008
Posts: 7

Ajax loop question

Sep 14 '08, 07:58 PM

Hi,

Can anyone find why this setTimeout() loop isn't working - I'm getting:

'data_to_send' is undefined

Any help much appreciated, thanks.

BTW, ajax.js contains my handling for creating the XMLHttpRequest, called createRequest() .

Code:

<html>
<head>

<script src="ajax.js" type="text/javascript"></script>

<script language="JavaScript">

function getData(data_to_send,zone_id)
{ 
	var url = "realtime_read_values.php";
	var req = create_request(); 
	req.open("POST", url, true); 
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	req.send(data_to_send); 
	req.onreadystatechange = function()
	{
		if(req.readyState == 4 && req.status == 200)
		{
			document.getElementById(zone_id).innerHTML  = req.responseText;
			//setTimeout("getData(window.data_to_send)", 3000); // this doesn't work
		} 
	}
	setTimeout("getData(data_to_send,zone_id)", 5000);
} 

</script>
	
<body onload="getData('graph_request=graph_counter1','zone1'); getData('graph_request=graph_counter2','zone2'); getData('graph_request=graph_counter3','zone3');">

<div id="zone1">
waiting for data..
</div> 	

<div id="zone2">
waiting for data..
</div> 	

<div id="zone3">
waiting for data..
</div> 	

</body>
</html>

Tags: None

Ferris

New Member

Join Date: Oct 2007

Posts: 101
#2

Sep 15 '08, 02:10 AM

Hi
I think , as a string type of setTimeout's 1st parameter, your parameters (data_to_send,z one_id) will not pass to the function getData.

Code:

setTimeout("getData(data_to_send,zone_id)", 5000);

you can use anonymous function to do it.
try this:

Code:

setTimeout(function(){ getData(data_to_send,zone_id); }, 5000);

Regards.
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Ajax loop question

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