variant-radioを複数設置したい

[hayato_a]

商品バリエーションの表示に使用されるvariant-radiosですが、商品詳細ページ内に、通常の位置＋スクロール時の追従バナー内に二箇所設置したいです。(イメージは土屋鞄様の商品ページです)

→単にコピペして貼り付けると、バリエーションパラメータが付与されず、カートに選択したバリエーションが追加できません。

元コード（Grobal.jsのClass）を編集する必要があるのでしょうか？

ちなみにコピペしますと、バリエーションクリック時に以下のエラーが返ってきます

Uncaught TypeError: Cannot read properties of undefined (reading 'value')
    at global.js?v=47979560903246619271709634806:739:91
    at Array.map (<anonymous>)
    at VariantRadiosForCartBanner.updateOptions (global.js?v=47979560903246619271709634806:738:30)
    at VariantRadiosForCartBanner.onVariantChange (global.js?v=47979560903246619271709634806:576:10)

Grobal.js

class VariantSelects extends HTMLElement {
  constructor() {
    super();
    this.addEventListener('change', this.onVariantChange);
  }

  onVariantChange() {
    this.updateOptions();
    this.updateMasterId();
    this.toggleAddButton(true, '', false);
    this.updatePickupAvailability();
    this.removeErrorMessage();

    if (!this.currentVariant) {
      this.toggleAddButton(true, '', true);
      this.setUnavailable();
    } else {
      this.updateMedia();
      this.updateURL();
      this.updateVariantInput();
      this.renderProductInfo();
    }
  }

  updateOptions() {
    this.options = Array.from(this.querySelectorAll('select'), (select) => select.value);
  }

  updateMasterId() {
    this.currentVariant = this.getVariantData().find((variant) => {
      return !variant.options.map((option, index) => {
        return this.options[index] === option;
      }).includes(false);
    });
  }

  updateMedia() {
    if (!this.currentVariant) return;
    if (!this.currentVariant.featured_media) return;
    const newMedia = document.querySelector(
      `[data-media-id="${this.dataset.section}-${this.currentVariant.featured_media.id}"]`
    );

    if (!newMedia) return;
    const modalContent = document.querySelector(`#ProductModal-${this.dataset.section} .product-media-modal__content`);
    const newMediaModal = modalContent.querySelector( `[data-media-id="${this.currentVariant.featured_media.id}"]`);
    const parent = newMedia.parentElement;
    if (parent.firstChild == newMedia) return;
    modalContent.prepend(newMediaModal);
    parent.prepend(newMedia);
    this.stickyHeader = this.stickyHeader || document.querySelector('sticky-header');
    if(this.stickyHeader) {
      this.stickyHeader.dispatchEvent(new Event('preventHeaderReveal'));
    }
    window.setTimeout(() => { parent.querySelector('li.product__media-item').scrollIntoView({behavior: "smooth"}); });
  }

  updateURL() {
    if (!this.currentVariant || this.dataset.updateUrl === 'false') return;
    window.history.replaceState({ }, '', `${this.dataset.url}?variant=${this.currentVariant.id}`);
  }

  updateVariantInput() {
    const productForms = document.querySelectorAll(`#product-form-${this.dataset.section}, #product-form-installment`);
    productForms.forEach((productForm) => {
      const input = productForm.querySelector('input[name="id"]');
      input.value = this.currentVariant.id;
      input.dispatchEvent(new Event('change', { bubbles: true }));
    });
  }

  updatePickupAvailability() {
    const pickUpAvailability = document.querySelector('pickup-availability');
    if (!pickUpAvailability) return;

    if (this.currentVariant && this.currentVariant.available) {
      pickUpAvailability.fetchAvailability(this.currentVariant.id);
    } else {
      pickUpAvailability.removeAttribute('available');
      pickUpAvailability.innerHTML = '';
    }
  }

  removeErrorMessage() {
    const section = this.closest('section');
    if (!section) return;

    const productForm = section.querySelector('product-form');
    if (productForm) productForm.handleErrorMessage();
  }

  renderProductInfo() {
    fetch(`${this.dataset.url}?variant=${this.currentVariant.id}&section_id=${this.dataset.section}`)
      .then((response) => response.text())
      .then((responseText) => {
        const id = `price-${this.dataset.section}`;
        const html = new DOMParser().parseFromString(responseText, 'text/html')
        const destination = document.getElementById(id);
        const source = html.getElementById(id);

        if (source && destination) destination.innerHTML = source.innerHTML;

        const price = document.getElementById(`price-${this.dataset.section}`);

        if (price) price.classList.remove('visibility-hidden');
        this.toggleAddButton(!this.currentVariant.available, window.variantStrings.soldOut);
      });
  }

  toggleAddButton(disable = true, text, modifyClass = true) {
    const productForm = document.getElementById(`product-form-${this.dataset.section}`);
    if (!productForm) return;
    const addButton = productForm.querySelector('[name="add"]');
    const addButtonText = productForm.querySelector('[name="add"] > span');

    if (!addButton) return;

    if (disable) {
      addButton.setAttribute('disabled', true);
      if (text) addButtonText.textContent = text;
    } else {
      addButton.removeAttribute('disabled');
      addButtonText.textContent = window.variantStrings.addToCart;
    }

    if (!modifyClass) return;
  }

  setUnavailable() {
    const button = document.getElementById(`product-form-${this.dataset.section}`);
    const addButton = button.querySelector('[name="add"]');
    const addButtonText = button.querySelector('[name="add"] > span');
    const price = document.getElementById(`price-${this.dataset.section}`);
    if (!addButton) return;
    addButtonText.textContent = window.variantStrings.unavailable;
    if (price) price.classList.add('visibility-hidden');
  }

  getVariantData() {
    this.variantData = this.variantData || JSON.parse(this.querySelector('[type="application/json"]').textContent);
    return this.variantData;
  }
}

customElements.define('variant-selects', VariantSelects);

class VariantRadios extends VariantSelects {
  constructor() {
    super();
  }

  updateOptions() {
    const fieldsets = Array.from(this.querySelectorAll('fieldset'));
    this.options = fieldsets.map((fieldset) => {
      return Array.from(fieldset.querySelectorAll('input')).find((radio) => radio.checked).value;
    });
  }
}

customElements.define('variant-radios', VariantRadios);