react-use-cart

🛒 A lightweight cart React hook library. Demo

Quick Start

import { CartProvider, useCart } from "react-use-cart";

function Page() {
  const { addItem } = useCart();

  const products = [
    {
      id: 1,
      name: "Malm",
      price: 9900,
    },
    {
      id: 2,
      name: "Nordli",
      price: 16500,
    },
    {
      id: 3,
      name: "Kullen",
      price: 4500,
    },
  ];

  return (
    <div>
      {products.map((p) => (
        <div key={p.id}>
          <button onClick={() => addItem(p)}>Add to cart</button>
        </div>
      ))}
    </div>
  );
}

function Cart() {
  const {
    isEmpty,
    totalUniqueItems,
    items,
    updateItemQuantity,
    removeItem,
  } = useCart();

  if (isEmpty) return <p>Your cart is empty</p>;

  return (
    <>
      <h1>Cart ({totalUniqueItems})</h1>

      <ul>
        {items.map((item) => (
          <li key={item.id}>
            {item.quantity} x {item.name} &mdash;
            <button
              onClick={() => updateItemQuantity(item.id, item.quantity - 1)}
            >
              -
            </button>
            <button
              onClick={() => updateItemQuantity(item.id, item.quantity + 1)}
            >
              +
            </button>
            <button onClick={() => removeItem(item.id)}>&times;</button>
          </li>
        ))}
      </ul>
    </>
  );
}

function App() {
  return (
    <CartProvider>
      <Page />
      <Cart />
    </CartProvider>
  );
}

Install

yarn add react-use-cart

CartProvider

You will need to wrap your application with the CartProvider component so that the useCart hook can access the cart state.

Carts are persisted across visits using localStorage.

Usage

import React from "react";
import ReactDOM from "react-dom";
import { CartProvider } from "react-use-cart";

ReactDOM.render(
  <CartProvider>{/* render app/cart here */}</CartProvider>,
  document.getElementById("root")
);

Props

• id: (optional) id for your cart to enable automatic cart retrieval via window.localStorage. If you pass a id then you can use multiple instances of CartProvider.
• onSetItems: Triggered only when setItems invoked
• onItemAdd: Triggered on items added to your cart, unless the item already exists, then onItemUpdate will be invoked
• onItemUpdate: Triggered on items updated in your cart, unless you are setting the quantity to 0, then onItemRemove will be invoked
• onItemRemove: Triggered on items removed from your cart
• storage: Must return [getter, setter]

useCart

The useCart hook exposes all the getter/setters for your cart state.

setItems(items)

The setItems method should be used to set all items in the cart. This will overwrite any existing cart items.

Args

• items[] (Required): An array of cart item object. You must provide an id and price value for new items that you add to cart.

Usage

import { useCart } from "react-use-cart";

const { setItems } = useCart();

const products = [
  {
    id: "ckb64v21u000001ksgw2s42ku",
    name: "Fresh Foam 1080v9",
    brand: "New Balance",
    color: "Neon Emerald with Dark Neptune",
    size: "US 10",
    width: "B - Standard",
    sku: "W1080LN9",
    price: 15000,
  },
  {
    id: "cjld2cjxh0000qzrmn831i7rn",
    name: "Fresh Foam 1080v9",
    brand: "New Balance",
    color: "Neon Emerald with Dark Neptune",
    size: "US 9",
    width: "B - Standard",
    sku: "W1080LN9",
    price: 15000,
  },
];

setItems(products, 2);

addItem(item, quantity)

The addItem method should be used to add items to the cart.

Args

• item (Required): An object that represents your cart item. You must provide an id and price value for new items that you add to cart.
• quantity (optional, default: 1): The amount of items you want to add.

Usage

import { useCart } from "react-use-cart";

const { addItem } = useCart();

const product = {
  id: "cjld2cjxh0000qzrmn831i7rn",
  name: "Fresh Foam 1080v9",
  brand: "New Balance",
  color: "Neon Emerald with Dark Neptune",
  size: "US 9",
  width: "B - Standard",
  sku: "W1080LN9",
  price: 15000,
};

addItem(product, 2);

updateItem(itemId, data)

The updateItem method should be used to update items in the cart.

Args

• itemId (Required): The cart item id you want to update.
• data (Required): The updated cart item object.

Usage

import { useCart } from "react-use-cart";

const { updateItem } = useCart();

updateItem("cjld2cjxh0000qzrmn831i7rn", {
  size: "UK 10",
});

updateItemQuantity(itemId, quantity)

The updateItemQuantity method should be used to update an items quantity value.

Args

• itemId (Required): The cart item id you want to update.
• quantity (Required): The updated cart item quantity.

Usage

import { useCart } from "react-use-cart";

const { updateItemQuantity } = useCart();

updateItemQuantity("cjld2cjxh0000qzrmn831i7rn", 1);

removeItem(itemId)

The removeItem method should be used to remove an item from the cart.

Args

• itemId (Required): The cart item id you want to remove.

Usage

import { useCart } from "react-use-cart";

const { removeItem } = useCart();

removeItem("cjld2cjxh0000qzrmn831i7rn");

emptyCart()

The emptyCart() method should be used to remove all cart items, and resetting cart totals to the default 0 values.

Usage

import { useCart } from "react-use-cart";

const { emptyCart } = useCart();

emptyCart();

items

This will return the current cart items.

Usage

import { useCart } from "react-use-cart";

const { items } = useCart();

isEmpty

A quick and easy way to check if the cart is empty.

Usage

import { useCart } from "react-use-cart";

const { isEmpty } = useCart();

getItem(itemId)

Get a specific cart item by id.

Args

• itemId (Required): The id of the item you're fetching.

Usage

import { useCart } from "react-use-cart";

const { getItem } = useCart();

const myItem = getItem("cjld2cjxh0000qzrmn831i7rn");

inCart(itemId)

Quickly check if an item is in the cart.

Args

• itemId (Required): The id of the item you're looking for.

Usage

import { useCart } from "react-use-cart";

const { inCart } = useCart();

inCart("cjld2cjxh0000qzrmn831i7rn") ? "In cart" : "Not in cart";

totalItems

This method returns the totaly quantity of items in the cart.

Usage

import { useCart } from "react-use-cart";

const { totalItems } = useCart();

totalUniqueItems

This method returns the total unique items in the cart.

Usage

import { useCart } from "react-use-cart";

const { totalUniqueItems } = useCart();

cartTotal

This method returns the total value of all items in the cart.

Usage

import { useCart } from "react-use-cart";

const { cartTotal } = useCart();