By Terry Jones
ISBN-10: 1449369391
ISBN-13: 9781449369392
Orchestrating asynchronous functionality calls in JavaScript frequently results in callback hell, yet there's a trustworthy technique to stay away from this painful scenario. With this concise and straightforward consultant, you'll use jQuery deferreds and can provide, a sublime procedure for dealing with asynchronous calls in either patron and server applications.
This ebook includes 18 examples that use deferreds to unravel gradually difficult real-world programming difficulties, besides seventy five stimulating puzzles (and their strategies) that can assist you know the way and whilst to take advantage of deferreds. You'll research new methods in a enjoyable means, and turn into immersed within the perform of event-based programming.
comprehend the good judgment at the back of growing deferreds and returning promises
Get a based clarification of jQuery's deferred API
Delve into the dynamics of utilizing deferreds
discover a huge choice of precious deferred recipes built by way of the authors
achieve hands-on event by way of fixing demanding situations that accompany every one recipe
move deeper into deferreds: stumble upon novel abstractions and mind-bending use cases
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Extra info for Learning jQuery Deferreds: Taming Callback Hell with Deferreds and Promises
Example text
Make it possible for the caller to specify the delay intervals. 2. If all calls to the passed function fail, the promise returned by retryingCaller should be rejected with the error value from the first failing call. But there’s one condition under which this is violated. Figure out what can go wrong and fix the bug. 3. Instead of rejecting the deferred with the original error value, reject it with the final value, or keep a list of the failure values and reject it with a list of all failures. info 4.
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. info | 19 Likewise, if you’re modernizing an existing project that uses deferreds, be careful in moving to a new version of jQuery—especially if, through some inconceivable chain of events, the code you’re working on doesn’t have a test suite!
Promise(); } The URL here is the endpoint for the Google Maps API. We create our own XMLHttpRequest object so that we can set its responseType to arraybuffer. ajax does not currently allow for receiving an ArrayBuffer. We set up a timeout to reject the deferred if the Google API call doesn’t complete within TIMEOUT milliseconds. When the data becomes available from Google, we turn it into a data URI. The base64ArrayBuffer function that converts an ArrayBuffer to base 64 is given in Appendix C. Finally, here’s the main function, createMapCache.
Learning jQuery Deferreds: Taming Callback Hell with Deferreds and Promises by Terry Jones
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