December 2014
Intermediate to advanced
102 pages
1h 45m
English
Content preview from Knockout.js
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Chapter 10. A Practical Example
For this final chapter, I thought it would be a good idea to see several of the things that have been demonstrated in small examples throughout the previous chapters. What better way to do that than with a shopping cart?
In previous examples, the HTML and JavaScript code have often been presented in a single example. Because this HTML and JavaScript is slightly larger than previous examples, it has been broken up into several small JavaScript files and one HTML file.
Building a Shopping Cart
Let’s begin by defining the goals of the shopping cart:
- Include a category selection to allow easy filtering of products
- Display a list of products for a given category
- See how many items are currently in the shopping cart
- Add an item to the cart
- Remove an item from the cart
- Display the running total of items in the cart
- Include some simple animations when adding/removing from the cart
I think that covers the core features of a typical shopping cart. By looking at these features, I see an immediate need for three arrays:
- List of categories with their available items.
- List of available products for the active category.
- List of items the user is interested in purchasing.
In addition to these three arrays, we want to keep track of the current running total.
Example 10-1 shows the HTML that covers the shopping cart’s features.
Example 10-1. HTML for shopping cart
<!DOCTYPE html><html><head><title>Yet Another Shopping Cart</title></head><body><div
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.