Session-based cart - url problem?

moggy

Howdy all,

I'm buliding a simple shopping cart using sessions, and have run into a problem...

I have put the usual 'add to cart' button on the product page, and this links to the basket page with 'action=add' and the product code in the url.

eg - basket.php?action=add&product code=123456

...using if($action=="add"){ etc.

This works fine,

BUT

if I refresh the page it adds another product to the cart.

Also when I delete a product it works fine (using 'action=delete' in the url, and an IF clause in the page - if($action=="delete"){ unset $_SESSION variable etc.

BUT

when I use the back button on the browser the product shows up again!

Can anyone help? 😕 😕 😕

Thanks,

Moggy

Snake_PHP

if I refresh the page it adds another product to the cart

try use this code in Start ( Action == adss)

<?
if($Action == "add"){

if(!isset($_SESSION['session_name'])){

ECHO " Add Ok ... ";

}else{

ECHo " was add ";

}
}
?>

and when you delete any thing use Refresh ..

<?
if($Action == "delete"){
// delete 

// put this code
ECHO "<meta http-equiv='refresh' content='5; url=$_SERVER[HTTP_REFERER]'>";
}

?>

tell me about results ..

moggy

Thanks Snake!

Add...

first time says 'add okay'

then on refresh it changes to 'was add'

Delete...

Doesn't change anything, when I go back in the browser it's shown again in the listing.

Snake_PHP

ok ..


<?
if($Action == "delete"){

unset($_SESSION['session_name']);
session_destroy();

echo "<meta http-equiv='refresh' content='5; url=$_SERVER[HTTP_REFERER]'>";
}
?>

try ..

moggy

Hi again,

Sorry, doens't fix it, the page simply refreshed after a second or so and the cart is empty.

Then when I use the back button in the browser the full cart is there again!

Is there a way of controlling the cached pages, i.e. when I go back in the browser to relead & recalculate) the page as opposed to showing the cached version? If ii use an include header with the html header info would that do it?

Thanks...

moggy

Just found out why this was if anyone's interested - it was to do with a URL whcih was too long. I just changed the form to POST instead of GET and the problem is solved. Weird though, can't find anything about this on the web...

Thanks guys for your help and patience in the meantime! ;-)