|
Subject:
|
Ch. 3 PHP example
|
|
Posted By:
|
bccliff
|
Post Date:
|
5/27/2008 10:54:32 AM
|
Hi:
Struggling with the code on pgs. 87-88 for the chapter 3 PHP version of the shopping cart.
My Catalogue1PHP.htm comes up just fine (server is WampServer) with the link to "Add to Shopping Cart" just fine, but upon a click nothing happens.
Couple of things:
1) Have downloaded the code from WROX and in Catalogue1PHP.htm I changed listed CSharp to C# (minor).
2) In CartPHP.js function AddRemove Item(action), the if statement in if(action == "Add") the two xHRObject.open's look exactly the same on both sides of the else (?) although in the book on page 81 there looks to be a space before on the else side of " managecart.php?action=......
3) Have checked the errata and don't see and listing for this coding section
Wondering if there has been any posting re: typos/fixes
I now sound like my students but my code looks good! Sorry
Any suggestions would be helpful as I would like to use this as my chapter 3 assignment.
TNX
Cliff
|
|
Reply By:
|
Chrisull
|
Reply Date:
|
6/4/2008 7:12:32 AM
|
Sorry there's two mistakes. You're correct with point 2) that it's a tautology. Just remove the if then and the else condition. It shouldn't have any bearing on the code (apart from making it non-optimal).
Second the PHP is incorrect. I'm not sure if it's the book or site code that is wrong. I submitted an updated version of the code I believe way back to the site, but this may not be on there. It should read as follows:
<?php
session_register('Cart');
header('Content-Type: text/xml');
?>
<?php
$newitem = $_GET["book"];
$action = $_GET["action"];
if ($_SESSION["Cart"] != "")
{
$MDA = $_SESSION["Cart"];
if ($action == "Add")
{
if ($MDA[$newitem] != "")
{
$value = $MDA[$newitem] + 1;
$MDA[$newitem] = $value;
$_SESSION["Cart"] = $MDA;
ECHO (toXml($MDA));
}
else
{
$MDA[$newitem] = "";
$_SESSION["Cart"] = $MDA;
ECHO (toXml($MDA));
}
}
else
{
$MDA= "";
$_SESSION["Cart"] = "";
ECHO (toXml($MDA));
}
}
else
{
$MDA[$newitem] = "1";
$_SESSION["Cart"] = $MDA;
ECHO (toXml($MDA));
}
function toXml($MDA)
{
$doc = new DomDocument('1.0');
$cart = $doc->createElement('cart');
$cart = $doc->appendChild($cart);
foreach ($MDA as $Item => $ItemName)
{
$book = $doc->createElement('book');
$book = $cart->appendChild($book);
$title = $doc->createElement('title');
$title = $book->appendChild($title);
$value = $doc->createTextNode($Item);
$value = $title->appendChild($value);
$quantity = $doc->createElement('quantity');
$quantity = $book->appendChild($quantity);
$value2 = $doc->createTextNode($ItemName);
$value2 = $quantity->appendChild($value2);
}
$strXml = $doc->saveXML();
return $strXml;
}
?>
Let me know if that helps,
Chris
Chris Ullman
Programmer/Technical Author
http://www.cuasp.co.uk
|
