Question

I’m using an Ajax function with a call to itself to update the information continuously. But I let the script run for a while and then the server blocked my IP because it thought I was flooding it or something like that, I don’t know. Anyway, I wonder if there’s another way to do this more properly. Here’s my code:

Ajax function:

function update_cart()
{
if (window.XMLHttpRequest)
    var http = new XMLHttpRequest();
else
    var http = new ActiveXObject('Microsoft.XMLHTTP');

http.onreadystatechange=function()
                       {
                           if ((http.readyState == 4) && (http.status == 200))
                           {                                   
                                id('cart_quantity').innerHTML = parseInt(http.responseText);
                                setTimeout('update_cart()', 1000);
                           }
                       }

http.open('GET', actual_path+'fetch_cart_quantity.php', true);  
http.setRequestHeader("X-Requested-With", "XMLHttpRequest");
http.send();        
}

PHP script:

<?php
if($_SERVER['HTTP_X_REQUESTED_WITH'] != 'XMLHttpRequest')
{
    header('Location: ./');
    exit();
}

session_start();

include '../include/config.php';
include '../include/db_handler.php';
include '../include/cart_handler.php';      

$cart = get_cart_quantity($_SESSION['cart_id']);
if ($cart == NULL) $cart = 0;

echo $cart;
?>

Thanks in advance for your help. Sorry that my English is not very good.

Answer 1

You have a couple of options here as I stated in my comment.

Basically the first is to chill out with the querying. You don’t need to long poll such a thing. Turn down the querying to once every 5 mins or just whenever there is an action.

You can also build a simple comet server to do a push pull type thing when ever updates are “pushed” down from the server. There is a pre-built one called APE: http://www.ape-project.org/

Also node.js can handle this sort of thing for you.

Also you should probably look into your server setup, sounds kinda weird that your sever is blocking it’s own IP address/domain…