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I need to change the weight of product after adding it to cart. The weight depends on the product attribute "quantite-avec-fenetre".

Based on Change cart items weight to update the shipping costs in Woocommerce, I am trying to use the following function in my theme's functions.php file:

add_action( 'woocommerce_before_calculate_totals', 'add_custom_weight', 10, 1);

function add_custom_weight( $cart_object ) {



    foreach ( $cart_object->get_cart() as $cart_item ) {

         //very simplified example - every item in cart will be 100 kg

        $attr = $cart_item['data']->get_attributes();

        if ($cart_item['data']->get_SKU() == "PSP229AFSF") {

            $qtySF = $attr["pa_quantite-sans-fenetre"];

            $qtyAF = $attr["pa_quantite-avec-fenetre"];

            var_dump($attr);

            //echo $qtyAF;

            //echo $qtySF;



            //echo "oll";

        }

        //echo $attr["pa_impressiont"];

        //$cart_item['data']->set_weight( 0.001 );

    }

    // Testing: cart weight output

}

The echo and things that look strange are just for test.
So, this show with var_dump all attribute of each product of my cart (that have SKU of PSP229AFSF).

The problem is I set the attribute, I add to cart, in the cart I the attribute ith good value, but he var_dump return me this :

array(7) { 

["pa_impression"]=> string(15) "sans-impression"

["pa_impressionrecto"]=> string(11) "1couleurpms"

["pa_impressionverso"]=> string(12) "sansimpverso"

["pa_fichierimpr"]=> string(12) "designertool" ["pa_bat"]=> string(3)

"non" ["pa_quantite-avec-fenetre"]=> string(0) ""

["pa_quantite-sans-fenetre"]=> string(0) "" }

As you can see, the attribute "pa_quantite-avec-fenetre" and "pa_quantite-sans-fenetre" are empty.

This is what my cart show (screenshot of cart):

So the attribute is well set in the cart, but it doesn't seem to be available in $cart_item.

I tried without plugins that can affect attribute, same effect, any idea where this comes from?

You need to get your variation product attribute data from the cart item (and not from the product itself).

So try this:

add_action( 'woocommerce_before_calculate_totals', 'custom_cart_item_weight', 10, 1);

function custom_cart_item_weight( $cart ) {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )

        return;



    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )

        return;



    foreach ( $cart_object->get_cart() as $cart_item ) {

        if ( $cart_item['data']->get_sku() == "PSP229AFSF" ) {

            $attributes = $cart_item['variation'];

            $attr_key = 'attribute_pa_';



            if( isset($attributes[$attr_key.'impression']) )

                $attr_imp = $attributes[$attr_key.'impression'];



            if( isset($attributes[$attr_key.'impressionrecto']) )

                $attr_imp_rec = $attributes[$attr_key.'impressionrecto'];



            if( isset($attributes[$attr_key.'impressionverso']) )

                $attr_imp_ver = $attributes[$attr_key.'impressionverso'];



            if( isset($attributes[$attr_key.'fichierimpr']) )

                $attr_fich_imp = $attributes[$attr_key.'fichierimpr'];



            if( isset($attributes[$attr_key.'bat']) )

                $attr_bat = $attributes[$attr_key.'bat'];



            if( isset($attributes[$attr_key.'quantite-sans-fenetre']) )

                $attr_qte_sf = $attributes[$attr_key.'quantite-sans-fenetre'];



            if( isset($attributes[$attr_key.'quantite-avec-fenetre']) )

                $attr_qte_af = $attributes[$attr_key.'quantite-avec-fenetre'];



            ## Make your weight calculations ##



            $new_weight = 1; // <=== Make your calculated weight



            $cart_item['data']->set_weight( $new_weight ); // Set the calculated weight

        }

    }

}

Code goes in function.php file of your active child theme (or active theme). It should better works.