Learning jQuery Deferreds: Taming Callback Hell with by Terry Jones

By Terry Jones

Orchestrating asynchronous functionality calls in JavaScript usually results in callback hell, yet there's a trustworthy solution to steer clear of this painful situation. With this concise and straightforward consultant, you'll use jQuery deferreds and grants, a sublime process for coping with asynchronous calls in either customer and server applications.

This ebook comprises 18 examples that use deferreds to unravel gradually demanding real-world programming difficulties, in addition to seventy five stimulating puzzles (and their strategies) to help you know the way and whilst to take advantage of deferreds. You'll study new methods in a enjoyable approach, and turn into immersed within the perform of event-based programming.

comprehend the common sense in the back of growing deferreds and returning promises
Get a established clarification of jQuery's deferred API
Delve into the dynamics of utilizing deferreds
discover a huge number of necessary deferred recipes constructed by means of the authors
achieve hands-on event by means of fixing demanding situations that accompany every one recipe
cross deeper into deferreds: stumble upon novel abstractions and mind-bending use cases

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

Sample text

0'); The METHODS object contains the functions that a client can call and expect replies from. Notice that each of the functions returns a promise that has already been resolved (or rejected). This is just to illustrate that, server side, we expect to be making calls to promise-returning functions. In more typical circumstances, the node server would make calls to other asynchronous methods that returned promises that the called methods would fire themselves. The div function checks the denominator of the division, and returns a rejected promise in the case of zero.

If you call a deferred method named in the left column with some set of arguments, all the callbacks added via the promise method named in the right column will be invoked, in the order they were added, each with the same set of arguments. info | 17 Table 2-1. Correspondence between deferred and promise method names Deferred method Promise method resolve or resolveWith done reject or rejectWith fail notify or notifyWith progress Deferred Dynamics Here is a summary of aspects of deferred behavior (some of which were described at length earlier) that you need to understand, along with some principles of deferred usage: • If your code creates a deferred but doesn’t eventually cause it to be resolved or rejected, you’re probably doing it wrong.

Then;. Changes in the jQuery Deferred API Be careful when reading the jQuery Deferred object documentation. 5 and in several subsequent versions there were changes to parts of the deferred API. 8 and that the different behaviors are all still documented. When reading code that uses jQuery deferreds, it is therefore sometimes important to know what version of jQuery the code will be run against. 3 are now current). ), when you’re writing deferred code you need to know what version of jQuery will be loaded.

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