php ajax : updating database field thru ajax

Question

i have a table which is populated of database data.

   <table class="table table-bordered">
                            <thead>
                                <tr>
                                    <th>Product Name</th>
                                    <th>Brand</th>
                                    <th>Category</th>
                                    <th>Featured</th>
                                </tr>
                            </thead>
                            <tbody>
                                <?php foreach($products as $product){ ?>
                                <tr>
                                    <td><?= $product->name; ?></td>
                                    <?php $brand->select("brand","products_brands")->where("id")->build();
                                    $pbrand = $brand->execute(array($product->brand))->fetch();?>
                                    <td><?= $pbrand->brand; ?></td>

                                    <?php $category->select("category,parent","products_categories")->where("id")->build();
                                    $procatChild = $category->execute(array($product->category))->fetch(); 
                                    $category->select("category","products_categories")->where("id")->build();
                                    $procatParent = $category->execute(array($procatChild->parent))->fetch(); ?>
                                    <td><?= $procatParent->category. " - " .$procatChild->category; ?></td>
                                    <td>
                                        <a id="afeat" href="products.php?product_id=<?= $product->id;?>&featured=<?= $product->featured;?>" class="btn btn-default btn-sm">
                                            <span class="<?= ($product->featured == 0) ? "fa fa-times-circle" : "fa fa-check-circle"; ?>"></span>
                                        </a>
                                    </td>
                                </tr>
                                <?php } ?>
                            </tbody>
                        </table>

now i want to update the featured field by clicking the a tag, but i didnt know how to pass the url parameters to ajax data to send it to php update script.I have been looking for the same problem but i didnt find concrete solutions. Thanks in advance guys