Async JavaScript - download pdf or read online

By Trevor Burnham

ISBN-10: 1937785270

ISBN-13: 9781937785277

Trevor Burnham, "Async JavaScript"
English | 2012 | 104 pages | PDF | three MB

With Async JavaScript, you’ll boost a deeper realizing of the JavaScript language. You’ll begin with a ground-up primer at the JavaScript occasion model—key to fending off a number of the commonest errors JavaScripters make. From there you’ll see instruments and layout styles for turning that conceptual figuring out into useful code.

The techniques within the ebook are illustrated with runnable examples drawn from either the browser and the Node.js server framework, incorporating complementary libraries together with jQuery, Backbone.js, and Async.js. You’ll find out how to create dynamic web content and hugely concurrent servers via getting to know the paintings of allotting occasions to the place they should be dealt with, instead of nesting callbacks inside of callbacks inside of callbacks.

Async JavaScript gets you up and operating with actual internet improvement speedy. by the point you’ve accomplished the guarantees bankruptcy, you’ll be parallelizing Ajax requests or working animations in series. through the top of the e-book, you’ll even understand how to leverage net employees and AMD for JavaScript purposes with state-of-the-art functionality. most significantly, you’ll have the data you must write async code with confidence.

What you need
Basic wisdom of JavaScript is suggested. in the event you suppose that you’re less than pace, see the “Resources for studying JavaScript” part within the preface.

Table of Contents
Chapter 1. realizing JavaScript Events
Chapter 2. dispensing Events
Chapter three. supplies and Deferreds
Chapter four. circulation regulate with Async.js
Chapter five. Multithreading with Workers
Chapter 6. Async Script Loading

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Sample text

So, for evented models to work, we have to remember to use methods like Backbone’s set and get. get('font'); // // // // // triggers alert! a a. com/111386188573471152118/posts/6peb6yffyWG To that end, Backbone models are often organized into Backbone collections, which are essentially evented arrays. You can listen for when models are added to and removed from them. Backbone collections automatically propagate events from the models they contain. For example, you might have a spriteCollection object containing hundreds of models representing things you’re drawing on a canvas element.

Observers won’t have a chance to respond to it. Clearly, maintaining two-way data bindings in Backbone is a challenge. js, takes a different approach: two-way bindings are declared explicitly. When one value changes, the other is updated asynchronously from a timeout event. So, until that event fires, the application’s data may be in an inconsistent state. There’s no easy solution to the problem of bindings across evented models. In Backbone, a prudent way to step around the issue is the silent flag.

Writing a selector for “elements with class tooltip that are not descendants of sidebar” is tricky and not very efficient. The problem would get exponentially harder if we decided to allow isolated containers to be nested to an arbitrary depth. But implementing this behavior with event logic rather than selector logic is easy. remove(); }); report erratum • discuss Chapter 2. Distributing Events • 28 (Notice the use of jQuery’s one instead of on. ) With these two lines of code, each tooltip will listen to its container and remove itself when the container gets a new tooltip.

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Async JavaScript by Trevor Burnham


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