سلام. وقت بخیر 

کدهای مربوط به قسمت دریافت response (فایل Ajax)رو قرار بدید تا بررسی کنیم. 

آیدی را الان میگیرم و تو inspect هم مقدارش رو گرفتم ولی باز محصول ادیت نمیشه 
 <<dashboard-ajax.js file>>
$('.select-product').on('click', function () {
        let el = $(this);
        let product_ID = el.data('id');
        $.ajax({
            url: 'http://localhost/wp-ajax/wp-admin/admin-ajax.php',
            type: 'post',
            data: {
                action: 'select_product_by_id',
                product_ID: product_ID
            },
            success: function (response) {
                let data = JSON.parse(response);
                $('#p_ID').val(data.ID);
                $('#p_name').val(data.p_name);
                $('#p_brand').val(data.p_brand);
                $('#p_model').val(data.p_model);
                $('#p_price').val(data.p_price);
                $('#p_status').val(data.p_status);
                console.log(data);
            },
            error: function (error) {
                console.log("error:", error);
            }
        });
    })
    $('#update_product').on('submit', function (e) {
        e.preventDefault();
        let p_ID = $('#p_ID').val();
        let p_name = $('#p_name').val();
        let p_brand = $('#p_brand').val();
        let p_model = $('#p_model').val();
        let p_price = $('#p_price').val();
        let p_status = $('#p_status').val();
        $.ajax({
            url: 'http://localhost/wp-ajax/wp-admin/admin-ajax.php',
            type: 'post',
            dataType:'json',
            data: {
                action: 'update_product',
                p_ID: p_ID,
                p_name: p_name,
                p_brand: p_brand,
                p_model: p_model,
                p_price: p_price,
                p_status: p_status
            },
            success: function (response) {
                console.log("response:", response);
            },
            error: function (error) {
                console.log("error:", error);
            }
        });
    })
})
----------------------------------------------------------------------
 <<products.php file>>
function select_product_by_id(){
    global $wpdb;
    $table = $wpdb->prefix . 'products';
    $ID = (int)$_POST['product_ID'];
    $stmt = $wpdb->get_row($wpdb->prepare("SELECT * FROM $table WHERE ID='%d'",$ID));
    $output = [
        'ID' => $stmt->ID,
        'p_name' => $stmt->p_name,
        'p_brand' => $stmt->p_brand,
        'p_model' => $stmt->p_model,
        'p_price' => $stmt->p_price,
        'p_status' => $stmt->p_status
    ];
    echo json_encode($output);
    wp_die();
}
function update_product()
{
    global $wpdb;
    $table = $wpdb->prefix . 'products';
    $p_ID = intval($_POST['ID']);
    $p_name = sanitize_text_field($_POST['p_name']);
    $p_brand = sanitize_text_field($_POST['p_brand']);
    $p_model = sanitize_text_field($_POST['p_model']);
    $p_price = sanitize_text_field($_POST['p_price']);
    $p_status = intval($_POST['p_status']);
    $data = [
        'p_name' => $p_name,
        'p_brand' => $p_brand,
        'p_model' => $p_model,
        'p_price' => $p_price,
        'p_status' => $p_status
    ];
    $where = ['ID' => $p_ID];
    $where_format = ['%d'];
    $format = ['%s','%s','%s','%s','%d'];
    $wpdb->update($table,$data,$where,$format,$where_format);
}
-------------------------------------------------------------------------------
 <<product-list.php file>>
<td>
                    <i class="bi bi-pencil select-product" data-bs-toggle="modal" data-bs-target="#editProduct" data-id="<?php echo $product->ID ?>" id="delete-item-<?php echo $product->ID ?>"></i>
                    <i class="fas fa-times-circle delete-product" id="delete-item-<?php echo $product->ID ?>" data-id="<?php echo $product->ID ?>" data-nonce="<?php echo wp_create_nonce() ?>"></i>
                </td>