Updating Quantity in my shopping cart

[peck3277]

Hey guys i'm pack for more help again!

For a site I'm making I need a shopping cart. It's all working but for some added functionality I would like to be able to update quantity of an item using an input box. For an example see this site: http://www.oonaghnaturals.com/ShoppingCart.php?

I'm using sessions to work my cart. Below is how i access my items in the shopping cart

foreach ($_SESSION['cart'] as $product_id => $quantity){

I hope i'm being clear? If not apologies and I can clear anything up.

Cheers guys

[JRM]

maybe Javascript would be better if it is to be updated by the user before submission?

[peck3277]

Well I'm going to have them submit their change.

On the shopping cart page it will say

item = shoe
qty = 1 (where the 1 is will be an input box)

(update cart button)

So I would be having them submit it.

[JRM]

I understand WHAT you are trying to do, but not the methodology.
Unless you are saving the data to a db, why bother burdening the server for a quantity change? If you are saving to a db, why not just fetch 'n display?
I don't see why you would want to store the data in a PHP static global..
Maybe I just don't understand your application.

[peck3277]

Sorry if I've confused the issue. My heads all over the place at the moment.

Edit: I'm not using a db or global variables. I'm using sessions to store the information (sessions actually maybe global variables I just dont know?)

When a user decides on a product and they hit add to cart, I send them to the cart.php page using

cart.php?action=add&id=1

On my cart.php page I get the action add. which does this:

switch($action) {    //decide what to do    
		
		case "add":
			if (isset ($_SESSION['cart'][$product_id]))
				$_SESSION['cart'][$product_id]++; //add one to the quantity of the product with id $product_id
			else
				$_SESSION['cart'][$product_id]=1;//if there isn't a product already then put it in
		break;

Using the following I then get then extract the quantity of each item:

foreach ($_SESSION['cart'] as $product_id => $quantity)

Below this then is just the code to display the cart

Each time I add a product to the cart it performs the above, Incrementing the product quantity where necessary.

So currently if I want to get 10 of product 1 I have to add it to the cart 10 times. I just need to come up with a way to be able to change the quantity by user inputting a number

[JRM]

Sorry if I've confused the issue. My heads all over the place at the moment.

Edit: I'm not using a db or global variables. I'm using sessions to store the information (sessions actually maybe global variables I just dont know?)

When a user decides on a product and they hit add to cart, I send them to the cart.php page using

cart.php?action=add&id=1

On my cart.php page I get the action add. which does this:

switch($action) {    //decide what to do    
		
		case "add":
			if (isset ($_SESSION['cart'][$product_id]))
				$_SESSION['cart'][$product_id]++; //add one to the quantity of the product with id $product_id
			else
				$_SESSION['cart'][$product_id]=1;//if there isn't a product already then put it in
		break;

Using the following I then get then extract the quantity of each item:

foreach ($_SESSION['cart'] as $product_id => $quantity)

Below this then is just the code to display the cart

Each time I add a product to the cart it performs the above, Incrementing the product quantity where necessary.

So currently if I want to get 10 of product 1 I have to add it to the cart 10 times. I just need to come up with a way to be able to change the quantity by user inputting a number

Yikes! There will be smoke coming from the server if business gets real busy! LOL
Just put an input tag there for the user to put a number into.
But really this is a much better thing to do with Javascript. You can do all kinds of things either a qauntity drop down list or a number or even an up/down arrow to increase or decrease the quantity. All of this, without hitting the server.
When the user is all happy with his entries...THEN do the submit processing.