Tiny Modern Shopping Cart Library – cart-localstorage

A small (~3kb minified) shopping cart component that uses HTML5 local storage to remember the cart items (products) the users added to the cart.

Also provides a functionality to calculate the total price of selected products in the shopping cart.

How to use it:

1. Install & download the package and load the JavaScript file from the dist folder or from a CDN:

# Yarn
$ yarn add cart-localstorage
# NPM
$ npm install cart-localstorage --save

<script src="./dist/cart-localstorage.min.js" defer></script>
<!-- OR -->
<script src="https://unpkg.com/cart-localstorage@latest/dist/cart-localstorage.min.js" defer></script>

2. Create an HTML table for the shopping cart.

<table class="table">
  <tbody class="cart">
  </tbody>
  <tfoot>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td class="text-right">Total: <strong class="total"></strong></td>
    <td></td>
  </tfoot>
</table>

3. The JavaScript to render the shopping cart.

function renderCart(items) {
  const $cart = document.querySelector(".cart")
  const $total = document.querySelector(".total")
  $cart.innerHTML = items.map((item) => `
      <tr>
        <td>#${item.id}</td>
        <td>${item.name}</td>
        <td>${item.quantity}</td>
        <td style="width: 60px;"> 
          <button type="button" class="btn btn-block btn-sm btn-outline-primary"
            onClick="cartLS.quantity(${item.id},1)">+</button>
        </td>
        <td style="width: 60px;"> 
          <button type="button" class="btn btn-block btn-sm btn-outline-primary"
            onClick="cartLS.quantity(${item.id},-1)">-</button>
        </td>
        <td class="text-right">$${item.price}</td>
        <td class="text-right"><Button class="btn btn-primary" onClick="cartLS.remove(${item.id})">Delete</Button></td>
      </tr>`).join("")
  $total.innerHTML = "$" + cartLS.total()
}
renderCart(cartLS.list())

4. Rerender the shopping cart when the product list has changed.

cartLS.onChange(renderCart)

5. Add items to the shopping cart.

cartLS.add({
  id: 1, 
  name: 'CSS', 
  price: 100
})
cartLS.add({
  id: 2, 
  name: 'Script', 
  price: 200
})
cartLS.add({
  id: 3, 
  name: 'CSSSCRIPT', 
  price: 300
})

6. List all items in the shopping cart.

cartLS.list();

7. Check if an item is in the shopping cart.

cartLS.exists(id);

8. Remove an item from the shopping cart.

cartLS.remove(id);

9. Update an item in the shopping cart.

cartLS.update(id, property, value);

10. Increase/decrease an product’s quantity.

cartLS.quantity(id, diff);

11. Get the information of an item.

cartLS.get(id);

12. Get the total price.

cartLS.total([reducer]);

13. Destroy the shopping cart instance.

cartLS.destroy();

Changelog:

v1.1.5 (04/26/2020)

• Rebuild