WooCommerce Ajax Add to cart

script.js

(function ($) {
  $.fn.serializeArrayAll = function () {
    var rCRLF = /\r?\n/g;
    return this.map(function () {
      return this.elements ? jQuery.makeArray(this.elements) : this;
    }).map(function (i, elem) {
      var val = jQuery(this).val();
      if (val == null) {
        return val == null
        //next 2 lines of code look if it is a checkbox and set the value to blank 
        //if it is unchecked
      } else if (this.type == "checkbox" && this.checked == false) {
        return {name: this.name, value: this.checked ? this.value : ''}
        //next lines are kept from default jQuery implementation and 
        //default to all checkboxes = on
      } else {
        return jQuery.isArray(val) ?
                jQuery.map(val, function (val, i) {
                  return {name: elem.name, value: val.replace(rCRLF, "\r\n")};
                }) :
                {name: elem.name, value: val.replace(rCRLF, "\r\n")};
      }
    }).get();
  };

  $(document).on('click', '.single_add_to_cart_button:not(.disabled)', function (e) {
    var $thisbutton = $(this),
            $form = $thisbutton.closest('form.cart'),
            //quantity = $form.find('input[name=quantity]').val() || 1,
            //product_id = $form.find('input[name=variation_id]').val() || $thisbutton.val(),
            data = $form.find('input:not([name="product_id"]), select, button, textarea').serializeArrayAll() || 0;

    $.each(data, function (i, item) {
      if (item.name == 'add-to-cart') {
        item.name = 'product_id';
        item.value = $form.find('input[name=variation_id]').val() || $thisbutton.val();
      }
    });

    e.preventDefault();

    $(document.body).trigger('adding_to_cart', [$thisbutton, data]);

    $.ajax({
      type: 'POST',
      url: woocommerce_params.wc_ajax_url.toString().replace('%%endpoint%%', 'add_to_cart'),
      data: data,
      beforeSend: function (response) {
        $thisbutton.removeClass('added').addClass('loading');
        // [INNSERT JS CODE TO DISPLAY CART: SIDEBAR, MENU MINICART]
      },
      complete: function (response) {
        $thisbutton.addClass('added').removeClass('loading');
      },
      success: function (response) {
        if (response.error & response.product_url) {
          window.location = response.product_url;
          return;
        }
        $(document.body).trigger('added_to_cart', [response.fragments, response.cart_hash, $thisbutton]);
      },
    });
    return false;
  });
})(jQuery);