Express Shopping Cart Middleware

A simple shoppingcart middleware for Express. inspired by LaravelShoppingcart

Install

This is a Node.js module available through the npm registry. Installation is done using the npm install command:

$ npm install express-cart-middleware

API

const expressCart = require('express-cart-middleware')

Overview

Look at one of the following topics to learn more about Express Shopping Cart Middleware

• Usage
• Instances
• Config
• Example

Usage

The shoppingcart gives you the following methods to use:

cart.add( [ options ] )

Adding an item to the cart is really simple, you just use the add() method, which accepts an Options Object.

• Options < Object >

this Options object contains the following keys

• id: product id (required and unique),
• name: product name (required),
• price: cost of product (required),
• quantity: quantity of product (required,
• preview: url to any resource (optional),
• attributes : extra details you want to add (optional)

 const options = { id, name, price, quantity, preview, attributes } // keys
 
 req.cart.add(options);
 

cart.update( [productId, [ data]] )

• productId < Integer >
• data < Object >

To update an item in the cart, you'll first need the product Id of the item. Next you can use the update() method to update it.

If you simply want to update the quantity, you'll pass to the update method the product id and the with an object quantity:

 const productId = 233;

 req.cart.update(productId, { quantity: 19 }); // Will update the quantity

cart.remove( [ productId ])

• productId < Integer >

To remove an item for the cart, you'll again need the product Id.

 const productId = 233;

 req.cart.remove(productId);

cart.get( [ productId ])

• productId < Integer >

If you want to get an item from the cart using its product id, you can simply call the get() method on the cart and pass it the product id.

 const productId = 233;

 req.cart.get(productId);

cart.content([ instance ])

• instance: < string > optional
• Returns: < Array >

Of course you also want to get the carts content. This is where you'll use the content method. This method will return a Collection of CartItems which you can iterate over and show the content to your customers.

 req.cart.content();

cart.checkout([ instance ])

• instance: < string > optional
• Returns: < >

If you want to completely remove the content of a cart, you can call the destroy method on the cart. This will remove all CartItems from the cart for the current cart instance.

 req.cart.checkout();

total([ instance ])

• instance: < string > optional
• Returns: < Integer >

The total() method can be used to get the calculated total of all items in the cart, given there price and quantity.

 req.cart.total();

cart.tax([ instance ])

• instance: < string > optional
• Returns: < Integer >

The tax() method can be used to get the calculated amount of tax for all items in the cart, given there price and quantity.

 req.cart.tax();

cart.subTotal([ instance ])

• instance: < string > optional
• Returns: < Integer >

The subTotal() method can be used to get the total of all items in the cart, minus the total amount of tax.

 req.cart.subTotal();

cart.count([ instance ])

• instance: < string > optional
• Returns: < Integer >

If you want to know how many items there are in your cart, you can use the count() method. This method will return the total number of items in the cart. So if you've added 2 books and 1 shirt, it will return 3 items.

  req.cart.Count();

cart.totalQuantity([ instance ])

• instance: < string > optional
• Returns: < Integer >

  req.cart.totalQuantity();

Instances

The packages supports multiple instances of the cart. The way this works is like this:

You can set the current instance of the cart by calling req.cart.add( Options, 'newInstance'). From this moment, the active instance of the cart will be newInstance, so when you add, remove or get the content of the cart, you're work with the newInstance instance of the cart. If you want to switch instances, you just call req.cart.add( Options, 'otherInstance') again, and you're working with the otherInstance again.

So a little example:

    const options = { 
               id: 223, 
               name: 'mouse',
               price: 8900, 
               quantity: 1, 
               preview: 'http://myimages/src/google.png', 
               attributes: [] 
               };
    // add product to the 'music' cart
    req.cart.add(options, 'music')

    // Get the content of the 'music' cart
    req.cart.content('music')

    // update the content of the 'music' cart
    req.cart.update(233, { name: 'new product name'}, 'music')

    // destroy all the content of the 'music' cart
    req.cart.checkout('music')

N.B. all methods provided by the req.cart takes in instance of a cart as it last Optional Argument .

N.B.2 Keep in mind that the cart stays in the last set instance for as long as you don't set a different one during script execution.

N.B.2 The default cart instance is called default, so when you're not using instances,req.cart.content() is the same as req.cart.content('default').

Example

N.B this package requires express-session

    const express = require("express")
    const session = require('express-session')
    const expressCart = require('express-cart-middleware')

    const app = express();

    app.use(session({
        secret: 'keyboard cat',
        resave: false,
        saveUninitialized: true,
        cookie: { secure: true }
    }))


    app.use(expressCart({tax: '12'})) // tax in %

    Or

    app.use(expressCart()) // without tax 


    app.get(/add_to_cart, (req, res)=>{

        req.cart.add({ id: 3, name: 'mouse', price: 8900, quantity: 1, preview: 'http://myimages/src/google.png', attributes: [] })
    })

More Examples

• Update Cart Item
• Display Cart Content
• Other examples