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Answer 1

+7 A:

Using jQuery's $.post() method:

setInterval(function(){
  $.post("getCount.php", function(result) {
    // do something with result
  }, "html");
}, 10000);

I'm assuming you have a good reason to query your own local script. If you want detailed information about who is visiting your site, when, and from what types of environments (machines, browsers, etc), I'd suggest you look into implementing something like Google Analytics.

Jonathan Sampson 2010-01-15 06:03:18

Answer 2

+1 A:

This Javascript will read the page usersonline.php every 10 seconds and place the contents onto the current web page.

<html>
<head>
<script>

var xmlrequest;

function gotnewdata()
{
    if(xmlrequest.readyState == 4)
    {
        document.getElementById("output").innerHTML = xmlrequest.responseText;
        setTimeout("loadpage();", 10000);
    }   
}

function loadpage()
{
    xmlrequest = new XMLHttpRequest();
    xmlrequest.open("GET", "usersonline.php", true);
    xmlrequest.onreadystatechange = gotnewdata;
    xmlrequest.send(null);
}

</script>
</head>
<body onload="loadpage();">
<h1>My Page</h1>
<p>USERS ONLINE:</p><p id="output"></p>
</body></html>

Adam Pierce 2010-01-15 06:33:45

There are three problems with this. 1) The inline event attachment is bad form and has issues, 2) passing an actual function to `setTimeout` rather than a string is preferable since it doesn't involve an implicit eval, and 3) this doesn't work in IE since `XMLHttpRequest` doesn't exist in that environment.

Justin Johnson 2010-01-15 06:52:13

Answer 3

+1 A:

<html>
<body>
<form target='userCountFrame' action='http://www.google.com'&gt;&lt;/form&gt;
<iframe name='userCountFrame'></iframe>
<script>
setInterval(function(){
  document.getElementsByTagName('form')[0].submit();
}, 10 * 60 * 1000);
</script>
</body>
</html>

change the url accordingly, save the above code as count.html on your desktop, and open it using Firefox

Dapeng 2010-01-15 10:20:51

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try to open a page every 10 seconds

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