Custom Discount based on Cart Subtotal
Solved
New to working with Shopify functions. I've read a ton of the documentation and followed the tutorial to create a discount experience for 10% off for a volume order.
I want to customize this now. Ideally, I want to eventually have a function for a tiered discount where a gift card of a certain value will be automatically added to the cart when the user enters a certain discount code. The gift card amount will be determined by the cart subtotal.
To work up to that, I'm currently just trying to have the cart subtotal discounted 10% when it is over $50. I've read the documentation for discounts and cart API and objects, but the code doesn't work. This is what I have (photos attached for easier reading):
// @TS-check
import { DiscountApplicationStrategy } from "../generated/api";
/**
* @typedef {import("../generated/api").InputQuery} InputQuery
* @typedef {import("../generated/api").FunctionResult} FunctionResult
* @typedef {import("../generated/api").Target} Target
* @typedef {import("../generated/api").ProductVariant} ProductVariant
*/
/**
* @type {FunctionResult}
*/
const EMPTY_DISCOUNT = {
discountApplicationStrategy: DiscountApplicationStrategy.First,
discounts: [],
};
// The @Shopify/shopify_function package will use the default export as your function entrypoint
export default /**
* @Anonymous {InputQuery} input
* @returns {FunctionResult}
*/
(input) => {
// Calculate the total pre-tax cost of items in the cart
let totalPreTaxCost = 0;
for (const line of input.cart.lines) {
const lineSubtotal = line.cost.subtotalAmount.amount;
totalPreTaxCost += lineSubtotal;
}
// Check if the total pre-tax cost is greater than $50
if (totalPreTaxCost > 50) {
// Add the free product to the cart
// Replace this with the code to add the free product to the cart
// ...
// Apply a 10% discount to all items in the cart
const targets = input.cart.lines.map(line => {
const variant = /** @type {ProductVariant} */ (line.merchandise);
return /** @type {Target} */ ({
productVariant: {
id: variant.id
}
});
});
if (!targets.length) {
console.error("No cart lines qualify for volume discount.");
return EMPTY_DISCOUNT;
}
return {
discounts: [
{
targets,
value: {
percentage: {
value: "10.0"
}
}
}
],
discountApplicationStrategy: DiscountApplicationStrategy.First
};
}
// If the total pre-tax cost is not greater than $50, return an empty discount
return EMPTY_DISCOUNT;
};
Accepted Solution (1)
