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Can't :/
This is my full time job, and i just gave you an hand this time.

Have a nice day !

Hi GV,

Here's a custom Fields i've wrote to do so : https://drive.google.com/file/d/1VOTBfJS5LnTdgc2N5hLi6VjUBSZrpmN-/view?usp=sharing

it supports MB builder and will display a field with the sum of other fields.

here's a working example :

 [
                'name'     => __( 'Price', 'your-text-domain' ),
                'id'       => 'id_price',
                'type'     => 'number',
                'min'      => 1,
                'max'      => 10000,
                'step'     => 1,
            ],
            [
                'name'     => __( 'Taxes', 'your-text-domain' ),
                'id'       => 'id_taxes',
                'type'     => 'number',
                'min'      => 1,
                'max'      => 30,
                'step'     => 1,
            ],
[
                'name'     => __( 'Taxes', 'your-text-domain' ),
                'id'       => 'id_delivery',
                'type'     => 'number',
                'min'      => 1,
                'max'      => 200,
                'step'     => 1,
            ],
            [
                'name'      => __( 'Sum Price+Taxes+Delivery', 'your-text-domain' ),
                'id'        => 'sum_price_taxes_delivery',
                'type'      => 'math_operator',
                'id_to_sum' => 'id_price,id_taxes,id_delivery',
            ]

Where you will see a new type of fields called math_operator and where id_to_sum is the id you want calculation for.

NB : it only support sum for the moment.

Have a nice day,

KL

hi ben06,

you can use the following code for sorting your group by date

add_action( 'rwmb_pieces_jointes_et_dates_after_save_post', function($object_id){

    $pj = $_POST['pieces_jointes_et_dates'];
    //sorting by date with usort 
    usort($pj, function($a, $b) {
        //convert date_fichier DD/MM/YYYY with datetime to get a timestamp that you can sort
        $a_date = DateTime::createFromFormat('d/m/Y', $a['date_fichier']);
        $b_date = DateTime::createFromFormat('d/m/Y', $b['date_fichier']);
        return $a_date->getTimestamp() - $b_date->getTimestamp();
    });

    //Then update the whole group value
    update_post_meta($object_id,'pieces_jointes_et_dates', $pj );
} );

Have a nice day 🙂