New PDF release: Learning jQuery Deferreds

By Terry Jones

ISBN-10: 1449369391

ISBN-13: 9781449369392

Orchestrating asynchronous functionality calls in javascript frequently ends up in callback hell, yet there's a trustworthy solution to stay away from this painful scenario. With this concise and easy consultant, you’ll find out how to use jQuery deferreds and delivers, a chic technique for coping with asynchronous calls in either shopper and server applications.This ebook comprises 18 examples that use deferreds to resolve gradually tough real-world programming difficulties, in addition to seventy five stimulating puzzles (and their suggestions) that can assist you know how and whilst to exploit deferreds. You’ll study new methods in a enjoyable approach, and turn into immersed within the perform of event-based programming.

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Table 2-1 shows the naming correspondence. 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. Putting It All Together | 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.

It returns an object with add and emptyPromise methods. js function for loading JavaScript from another file. inProgress holds a list of outstanding promises. waitingForEmpty holds a list of deferreds whose promises have been given to pool observers that want to know when the pool is empty. Add the given promise to the list of in-progress tasks. When the promise fires, remove it from the in-progress promises. A Promise Pool with an emptyPromise Method | 29 If we now have no promises in progress, resolve all waiting deferreds.

Change the shutdown code so that it first waits for the pool of HTTP GET requests to empty, then adds shutdown promises to the pool, and then waits again for the pool to empty before exiting. 5. Change createPromisePool to allow the caller to pass a function. The function should be evaluated each time an outstanding promise fires and if it returns true, resolve all the waiting deferreds. You might like to pass the function the number of items in the inProgress list, or even the list itself (if you’re the trusting type).

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Learning jQuery Deferreds by Terry Jones

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