Professional CodeIgniter, Thomas Myer
Chapter 5: Building a Shopping Cart
119
function updateCartAjax($idlist){
$cart = $_SESSION[`cart'];
//split idlist on comma first
$records = explode(`,',$idlist);
$updated = 0;
$totalprice = $_SESSION[`totalprice'];
if (count($records)){
foreach ($records as $record){
if (strlen($record)){
//split each record on colon
$fields = explode(":",$record);
$id = $fields[0];
$ct = $fields[1];
if ($ct
>
0
&
&
$ct != $cart[$id][`count']){
$cart[$id][`count'] = $ct;
$updated++;
}elseif ($ct == 0){
unset($cart[$id]);
$updated++;
}
}
}
if ($updated){
$totalprice =0; //with changes, must reset this value!
foreach ($cart as $id =
>
$product){
$totalprice += $product[`price'] * $product[`count'];
}
$_SESSION[`totalprice'] = $totalprice;
$_SESSION[`cart'] =$cart;
echo $updated . " records updated!";
}else{
echo "No changes detected!";
}
}else{
echo "No records to update!";
}
}
Give it a try by changing a few items in the Shopping Cart and hitting Update. What you should see is
something similar to Figure 5 - 5 .
c05.indd 119
c05.indd 119
6/10/08 5:35:19 PM
6/10/08 5:35:19 PM