Automatic ajax call using jQuery

Total used files :

  • index.php
  • jquery.js
  • random.php

I am using jQuery’s setInterval() method to automatically make the ajax call in every 2 seconds.

index.php


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Refresh Page itself</title>
<script type="text/javascript" src="jquery.js"></script>
<script>
$(document).ready(function(){
var callAjax = function(){
$.ajax({
method:’get’,
url:’random.php’,
success:function(data){
$("#sample").html(data);
}
});
}
setInterval(callAjax,2000);
});
</script>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<?php
print "Below number changes in 2 seconds interval, View-Source of this page to see the usuage of jquery for content refresh.<div id=’sample’>100 </div>";
?>
</body>
</html>

In above code, the interesting code is in line 17,

setInterval(callAjax,2000);

which calls the callAjax function in every 2 seconds. Here 2000 is supplied in milliseconds.

line 11 – sets the url to “random.php”

line 13 – replaces the #sample div with the response from the “random.php” file that is the output of

print 5*rand(1,100);

And this is the code for “random.php” that is called by ajax call in every 2 seconds.
random.php


<?php
print 5*rand(1,100);

You can test the demo online at http://www.samundra.com.np/refresh/

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