Read e-book online Learning jQuery Deferreds: Taming Callback Hell with PDF

By Terry Jones

ISBN-10: 1449369391

ISBN-13: 9781449369392

Orchestrating asynchronous functionality calls in JavaScript usually results in callback hell, yet there's a trustworthy option to keep away from this painful scenario. With this concise and easy advisor, you’ll how one can use jQuery deferreds and can provide, a chic method for coping with asynchronous calls in either customer and server applications.

This ebook comprises 18 examples that use deferreds to unravel gradually tough real-world programming difficulties, besides seventy five stimulating puzzles (and their options) that can assist you know how and whilst to exploit deferreds. You’ll research new tips in a enjoyable means, and develop into immersed within the perform of event-based programming.

  • Understand the good judgment at the back of growing deferreds and returning delivers
  • Get a based rationalization of jQuery’s deferred API
  • Delve into the dynamics of utilizing deferreds
  • Explore a extensive choice of worthwhile deferred recipes built through the authors
  • Gain hands-on adventure by way of fixing demanding situations that accompany every one recipe
  • Go deeper into deferreds: stumble upon novel abstractions and mind-bending use instances

Show description

Read or Download Learning jQuery Deferreds: Taming Callback Hell with Deferreds and Promises PDF

Best web programming books

Download e-book for iPad: Mastering Play Framework for Scala by Shiti Saxena

Approximately This Book

Demystify the quandaries of net improvement utilizing Play Framework
attempt and debug your apps through the use of Play's inbuilt checking out framework
grasp the center beneficial properties of Scala via a entire insurance of code and examples for various scenarios

Who This publication Is For

This publication is meant for these builders who're willing to grasp the inner workings of Play Framework to successfully construct and set up web-related apps.
What you'll Learn

customise your framework to house the categorical standards of an software
increase responsive, trustworthy, and hugely scalable purposes utilizing Play Framework
construct and customise Play Framework plugins that may be utilized in a number of Play purposes
make yourself familiar with third-party APIs to prevent rewriting current code
achieve an perception into many of the facets of trying out and debugging in Play to effectively try out your apps
Get to understand all concerning the techniques of WebSockets and Actors to technique messages in response to events

In Detail

Play Framework is an open resource internet software framework that's written in Java and Scala. It follows the Model-View-Controller architectural trend and allows the consumer to hire Scala for program improvement, whereas holding key houses and lines of Play Framework intact.

Starting off through development a simple program with minimum good points, you get a close perception into dealing with info transactions and designing types in Play. subsequent, you enterprise into the thoughts of Actors and WebSockets, the method of manipulating facts streams, and checking out and debugging an program in Play. eventually, you achieve an perception into extending the framework via writing customized modules or plugins in Play. each one bankruptcy has a troubleshooting part that is helping you out by way of discussing the motives of, and strategies to, a few mostly confronted concerns.

Exam Ref 70-486 Developing ASP.NET MVC 4 Web Applications - download pdf or read online

Arrange for Microsoft examination 70-486 — and support display your real-world mastery of constructing ASP. web MVC-based recommendations. Designed for skilled builders able to enhance their prestige, examination Ref specializes in the critical-thinking and decision-making acumen wanted for fulfillment on the Microsoft expert point.

Get Professional DotNetNuke 5: Open Source Web Application PDF

DotNetNuke author Shaun Walker leads this superlative writer staff of MVPs whereas supplying the newest replace of a bestseller. they provide whole assurance of the foremost revisions to DotNetNuke five, resembling extra granular management, widgets, XHTML compliance, more advantageous social networking, workflow, and higher content material administration.

Extra info for Learning jQuery Deferreds: Taming Callback Hell with Deferreds and Promises

Sample text

Arrange to reject the deferred in case of error. Arrange to resolve the deferred with a result if no error occurs. Return a promise created from the deferred. done(function(){ // Keys for the user's last URL and timestamp saved to local storage. }); Challenges 1. local functions (get, get BytesInUse, remove, and clear). 2. js Redis package provides a callback-style interface to the Redis. Choose some Redis API calls and make deferred versions of them. Your functions should call the existing callback-based API to get the Redis work done; you’re just providing a deferred interface.

Exit(); }); }); 46 | Chapter 3: Deferred Recipes This is much more concise. There’s only one small problem: it won’t work! Why not? 5. when ap‐ proach to fail. when to not behave that way, and what would that mean for code that used it? when? when have been written to allow future changes so we wouldn’t be stuck with this behavior? Automatically Retrying Failing Deferred Calls These days a common need is to write code that talks to services that may be briefly unavailable. If an error of some kind occurs, the correct (and documented) action to take is just to retry the original call a little later.

On any cache miss (either in-memory or local storage, or both) we’ll make sure to save the newly retrieved data URI as appropriate. 32 | Chapter 3: Deferred Recipes The use of Chrome local storage for the middle layer of our approach is an unimportant detail. Please don’t let it put you off if you’re not a Chrome user. The example is worth considering in any case, and you should be able to swap in your own middle level if necessary. First of all, here are a couple of utility functions to get and set values from Chrome local storage.

Download PDF sample

Learning jQuery Deferreds: Taming Callback Hell with Deferreds and Promises by Terry Jones


by Steven
4.1

Rated 4.17 of 5 – based on 50 votes