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

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

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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.

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

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