Book Image

jQuery Design Patterns

By : Thodoris Greasidis
Book Image

jQuery Design Patterns

By: Thodoris Greasidis

Overview of this book

jQuery is a feature-rich JavaScript library that makes HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a variety of browsers. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write JavaScript. jQuery solves the problems of DOM manipulation, event detection, AJAX calls, element selection and document queries, element attribute and data management, as well as object management utilities. This book addresses these problems and shows you how to make the best of jQuery through the various design patterns available. The book starts off with a refresher to jQuery and will then take you through the different design patterns such as facade, observer, publisher/subscriber, and so on. We will also go into client-side templating techniques and libraries, as well as some plugin development patterns. Finally, we will look into some best practices that you can use to make the best of jQuery.

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Table of Contents (18 chapters)
jQuery Design Patterns
jQuery Design Patterns
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
A Refresher on jQuery and the Composite Pattern
A Refresher on jQuery and the Composite Pattern
jQuery and DOM scripting
The Composite Pattern
The Iterator Pattern
Summary
2
The Observer Pattern
The Observer Pattern
Introducing the Observer Pattern
Introducing the Delegated Event Observer Pattern
Summary
3
The Publish/Subscribe Pattern
The Publish/Subscribe Pattern
Introducing the Publish/Subscribe Pattern
How it is adopted by jQuery
Demonstrating a sample use case
Using custom event namespacing
Summary
4
Divide and Conquer with the Module Pattern
Divide and Conquer with the Module Pattern
Modules and Namespaces
The Object Literal Pattern
The Module Pattern
The Revealing Module Pattern
Using ES5 Strict Mode
Introducing ES6 Modules
Using Modules in jQuery applications
Summary
5
The Facade Pattern
The Facade Pattern
Introducing the Facade Pattern
The benefits of this pattern
How it is adopted by jQuery
Using Facades in our applications
Summary
6
The Builder and Factory Patterns
The Builder and Factory Patterns
Introducing the Factory Pattern
Introducing the Builder Pattern
Summary
7
Asynchronous Control Flow Patterns
Asynchronous Control Flow Patterns
Programming with callbacks
Introducing the concept of Promises
Chaining Promises
Summary
8
Mock Object Pattern
Mock Object Pattern
Introducing the Mock Object Pattern
Using Mock Objects in jQuery applications
Summary
9
Client-side Templating
Client-side Templating
Introducing Underscore.js
Introducing Handlebars.js
Retrieving HTML templates asynchronously
Summary
10
Plugin and Widget Development Patterns
Plugin and Widget Development Patterns
Introducing jQuery Plugins
Creating reusable plugins
Using the jQuery Plugin Boilerplate
Choosing a name
Summary
11
Optimization Patterns
Optimization Patterns
Placing scripts near the end of the page
Bundling and minifying resources
Using CDNs
Optimizing common JavaScript code
Writing performant CSS selectors
Writing efficient jQuery code
Lazy Loading Modules
Summary
Index
Index

Using Facades in our applications

In order to demonstrate how facades can be used both to encapsulate complexity, helping us enforce the Separation of Concerns principle, and also abstract third-party library APIs into more convenient methods that are application centric, we are going to demonstrate a very simple lottery application. Our "Element Lottery" application will populate its container with some Lottery Ticket elements that will have a unique ID and contain a random number.

The winning ticket will be picked by randomly selecting one of the lottery elements, based on a random index among the created unique IDs. The winning number will then be announced to be the numeric content of the picked element. Let's see the modules of our application:

(function() { 
  window.elementLottery = window.elementLottery || {}; 

  var elementIDs; 
  var $lottery; 
  var ticketCount = 30; 

  elementLottery.init = function() { 
    elementIDs = []; 
    $lottery = $('#lottery').empty(); 
    elementLottery...
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