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I'm developing a small plugin for WooCommerce and I've been trying to find out how I can get the number of items submitted from the quantity field on a single-product page after the add-to-cart action has completed.

I have a custom popup for up-sells that appears after a customer has added an item to their cart and I would like to display information about the item they've just added (a success message) and their current cart totals as well as the up-sell products. I can get the product details (e.g. image, title, price etc.) and I have the cart item count and totals but what I can't seem to get is the number of items that were just submitted.

Any help please?

I have tried the $_REQUEST php super-global but no luck, WooCommerce must empty it once it has the data from the form submit. I have also tried looking in some of the WooCommerce globals too but can't find the relevant data!

I really appreciate any help or suggestions you can offer.


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Never used WooCommerce but I don't see why you can't set your own $_SESSION (or $_POST) data when the form is submitted then retrieve that after. There may be a more WooCommerce way to do it but that should work. –  BandonRandon May 14 '13 at 8:09
I would but I don't know what hooks to use to intercept the form data before the WC function is called. I would need a pass-through function that jumps in to the execution queue before WC's "add_to_cart" function but passes the data on 'untouched' afterwards. I do not want to edit any of WC's files directly because this will cause problems with updating. –  Chris May 14 '13 at 8:57
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2 Answers

Take a look at this function in woocommerce-ajax.php:

function woocommerce_ajax_add_to_cart() {
        global $woocommerce;

        $product_id        = apply_filters( 'woocommerce_add_to_cart_product_id', absint( $_POST['product_id'] ) );
        $quantity          = empty( $_POST['quantity'] ) ? 1 : apply_filters( 'woocommerce_stock_amount', $_POST['quantity'] );
        $passed_validation = apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity );

        if ( $passed_validation && $woocommerce->cart->add_to_cart( $product_id, $quantity ) ) {

            do_action( 'woocommerce_ajax_added_to_cart', $product_id );

            if ( get_option( 'woocommerce_cart_redirect_after_add' ) == 'yes' ) {
                woocommerce_add_to_cart_message( $product_id );

            // Return fragments

        } else {...

This is the (ajax) add_to_cart function called from any product archive page. So at least the $product_id is passed to the action 'woocommerce_ajax_added_to_cart'. I suppose you can get the quantity by inspecting the cart within that action for the given product_id. But you'll probably only get the total quantity, not what was just added.

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thanks @alvaro.d - I have looked at this function but I couldn't see a way to get at the raw $_POST data :( -- I also tried another function in the WC_Cart object but with no luck: docs.woothemes.com/wc-apidocs/… –  Chris May 14 '13 at 20:01
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After it is added to the cart you can access the cart object, which will have all the items and their quantities.

global $woocommerce;
$cart_items =  $woocommerce->cart->get_cart();

I usually var_dump the cart on a hook on the cart page, though there are probably better ways to debug.

There's also a get_cart_item_quantities() method in the cart class. Check out the WC_Cart class in the includes\class-wc-cart.php file.

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