sutty-base-jekyll-theme/_packs/controllers/cart_coupon_controller.js

import { CartBaseController } from "./cart_base_controller";

/*
 * Retrieves shipping methods
 */
export default class extends CartBaseController {
  static targets = ["couponCodeInvalid", "preDiscount", "total"];

  connect() {
    this.couponCode.addEventListener("input", (event) => {
      this.couponCode.parentElement.classList.remove("was-validated");
      this.couponCode.setCustomValidity("");
    });
  }

  get couponCode() {
    if (!this._couponCode) this._couponCode = this.element.elements.coupon_code;

    return this._couponCode;
  }

  get couponCodeInvalid() {
    return this.hasCouponCodeInvalidTarget
      ? this.couponCodeInvalidTarget
      : document.querySelector("#coupon-code-invalid");
  }

  get preDiscount() {
    return this.hasPreDiscountTarget
      ? this.preDiscountTarget
      : document.querySelector("#pre-discount");
  }

  get total() {
    return this.hasTotalTarget
      ? this.totalTarget
      : document.querySelector("#total");
  }

  set total(total) {
    this.total.innerHTML = total;
  }

  async apply(event = undefined) {
    event?.preventDefault();
    event?.stopPropagation();

    const orderToken = this.token;
    const coupon_code = this.couponCode.value;
    const include = "line_items";

    const response = await window.spree.cart.applyCouponCode(
      { orderToken },
      { coupon_code, include }
    );

    this.element.elements.forEach((x) => (x.disabled = true));

    if (response.isFail()) {
      this.couponCodeInvalid.innerHTML = response.fail().summary;
      this.couponCode.setCustomValidity(response.fail().summary);
      this.couponCode.parentElement.classList.add("was-validated");

      this.element.elements.forEach((x) => (x.disabled = false));

      return;
    }

    this.cart = response;
    this.total = response.success().data.attributes.total;
    this.preDiscount.classList.remove("d-none");
  }
}