Using AJAX, sometimes you need to get data from the server.
This bit of code will retrieve data from a server:
<script>
function ajaxNow()
{
var xmlHttp;
try
{
/* Firefox, Opera 8.0+, Safari */
xmlHttp=new XMLHttpRequest();
}
catch (e)
{
/* newer IE */
try
{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
/* older IE */
try
{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e)
{
alert("Your browser is old and does not have AJAX support!");
return false;
}
}
}
xmlHttp.onreadystatechange=function()
{
if(xmlHttp.readyState==4)
{
/* this puts the value into an alert */
alert("Value read is: "+xmlHttp.responseText);
}
}
xmlHttp.open("GET","ajax_file.php",true);
xmlHttp.send(null);
}
</script>
In this code, you will need to have a form or object to show the data.
You need to have a file on your server (ajax_file.php noted above) which will
send output (STD-OUT for the server file).
The above function needs to be called at some interval on some event.
