jQuery is a library of functions for JavaScript that provides easy and sophisticated access to the HTML in a web page. Originally intended to smooth over the differences in the way browsers interact with JavaScript, it has developed into a much more powerful tool that fully lives up to its motto of "write less, do more". As a result jQuery is compact and can seem cryptic until you get used its common idioms. Written for JavaScript developers working with web page layout, Just jQuery: The Core UI enables you to use jQuery easily and efficiently. It also cuts through its seeming complexity, by presenting enough explanation at every stage for you to understand what is happening. After outlining what jQuery is, how to obtain it and why you should use it, early chapters deal with the essential jQuery - its selectors, filters and DOM traversal functions. Next we look at how to modify existing HTML elements and how to create completely new elements. Next we look at more advanced aspects of the UI - storing data and working with forms. jQuery also provides simple animation functions and to understand these we look at function queues and asychronous animation. Adding custom elements, both to the jQuery UI and to jQuery itself, is the next major topic. The book closes with an explanation of how jQuery's unit testing package, QUnit, lets you write tests to make sure that your JavaScript code works and continues to work.

Just jQuery: The Core UI

Computers & Technology

Elliot, Ian

Web Development & Design

I/O Press

jQuery is the closest thing JavaScript has to a standard library, yet many programmers never venture beyond its most obvious facilities. As well as having easy to use and very powerful DOM manipulation features, described in the companion book Just jQuery: The Core UI, it also offers an improved JavaScript event system, help with writing asynchronous code in the form of Promises, and easy to use and powerful AJAX functions. Written for JavaScript developers working with advanced web pages Just jQuery: Events, Async & AJAX covers the parts of jQuery not associated with the DOM. Specifically it is about how to make use of jQuery's event functions, Deferred and Promise functions and its AJAX functions. While not every programmer will need these advanced features in the early stages of using JavaScript, they are unavoidable aspects of modern web programming and sooner or later you will find a need to master them all. This book is about ideas. It does show you how to use jQuery, but mainly by explaining how jQuery approaches the task. Once you understand this there is little need to go over complicated examples where the problem is seeing the big ideas because the small detail is overwhelming. This is not a book of projects or case studies, it is about understanding jQuery.

Just jQuery: Events, Async & Ajax

Asynchronous programming is essential to the modern web and at last JavaScript programmers have the tools to do the job – the Promise object and the async and await commands. These are so elegant in their design that you need to know about them if only to be impressed. It is likely that other languages will incorporate similar facilities in the future. While async and await make asynchronous code as easy to use as synchronous code there are a lot of subtle things going on and to really master the situation you need to know about Promises and you need to know how the JavaScript dispatch queue works. Written for experienced JavaScript developers who want to get to grips with the complexities of the language, JavaScript Async guides you through the story of async. It starts with Events, which is where asynchronous programming originates, but it quickly becomes apparent that you need additional ways of dealing with long running tasks. The most basic solution is the callback and this is where async programming starts to become difficult. JavaScript used to be a single-threaded language, but with the introduction of the Web Worker you can write multi-threaded programs. Promises are the pinnacle of async programming in JavaScript and putting them together with the dispatch queue provides further advances. The way that async and await work with Promises is nothing short of amazing. The book concludes with a look at how async and await integrate with some of the latest JavaScript APIs that are based on the Promise object. The Service Worker is possibly the biggest change in the way JavaScript can be used to create programs that are just as happy being offline as online. Working with async can be confusing and disorienting, but by combining code examples and lucid explanations Ian Elliot presents a coherent explanation. If you want to work with async read this book first.

JavaScript Async: Events, Callbacks, Promises and Async Await

Just JavaScript is an attempt to understand JavaScript for what it really is - a very different language that should not be compared to Java or dismissed as simply a scripting language. It looks at the ideas that originally motivated the JavaScript approach and also at the additions over time that have produced modern JavaScript/ECMAScript. It isn't a complete introduction to JavaScript and isn't for the complete beginner to programming. It has been written for those who are familiar with the basic constructs used in any programming language and have already encountered JavaScript. After reading it, you will have an understanding how and why JavaScript is unique and the way in which you can exploit its strengths. After a brief overview of its history, we come to the key idea in JavaScript: it is object-based. Everything in JavaScript is an object and three chapters are used to introduce objects before we meet the Function Object. The many different ways of creating a JavaScript function tends to hide the fact that they are indeed all objects with properties and a lifetime that is different from local variables. This is the reason closure is natural. Having explored JavaScript's unique approach to parameters we are ready to consider how functions become methods. After this factory functions and constructors seem obvious as does the prototype chain. The final three chapters tackle the issues that are usually seen as problems for JavaScript and which are now reconciled within the idiomatic approach.

Just JavaScript: An Idiomatic Approach

Since the introduction of Canvas into HTML, JavaScript has been a first class language for graphics allowing you to create graphics without resorting to a library of any kind. 
This book is all about programming Canvas. Like many books and online resources, it covers the basics of using Canvas, but it also goes into many of the skills that you need to make good use of these facilities. For example, a graphics application often needs to download or upload files, but exactly how to do this in a modern way is difficult to find out. If you do upload a file then you might want to work with it at the pixel level and this requires working with raw binary data. How do you do this in JavaScript, which tries hard to keep data types hidden from the programmer? 
As far as the user is concerned, there is also the issue of how to keep graphic processes from bringing your application to a halt. You need to keep graphics on a separate thread or use the GPU to get the job done, or both. 
Although most of the book is concerned with the standard 2d graphics context, the final chapters explain the use of WebGL with Canvas as a general purpose rendering engine, including how to use it for 3D graphics and for fast 2D graphics. 
What you will learn: 
The canvas element and the fundamental ideas of a path and its stroke and fill properties 
Transformations – organizing and using unit shapes as the building blocks for complex graphics 
Working with text including typography and SVG Text 
Clipping, compositing and effects 
The Image object as a source of bitmaps 
Image loading and saving using async and await 
Sprite-based animation using web workers and Offscreencanvas 
Files blobs and the Fetch API 
Image processing, filters and convolution 
Using Canvas with WebGL for 3D graphics display 
Using WebGL to implements fast 2D graphics 
Ian Elliot is a core member of the I Programmer team where he writes on all aspects of web development. This is his fifth book on JavaScript. The others are Just JavaScript: An Idiomatic Approach; JavaScript Async: Events, Callbacks, Promises and Async Await, Just jQuery: The Core UI and Just jQuery: Events, Async & AJAX.

JavaScript Bitmap Graphics with Canvas

The Sea, the Sky and Dublin Port

History

Europe

Wordwell Books

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