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Learning jQuery Deferreds - download pdf or read online

Posted On April 20, 2018 at 12:08 am by / Comments Off on Learning jQuery Deferreds - download pdf or read online

By Terry Jones

ISBN-10: 1449369391

ISBN-13: 9781449369392

Orchestrating asynchronous functionality calls in javascript usually ends up in callback hell, yet there's a trustworthy option to stay away from this painful situation. With this concise and easy consultant, you’ll the way to use jQuery deferreds and grants, 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 hard real-world programming difficulties, in addition to seventy five stimulating puzzles (and their recommendations) to help you know the way and while to exploit deferreds. You’ll research new tips in a enjoyable approach, and develop into immersed within the perform of event-based programming.

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The base64ArrayBuffer function that converts an ArrayBuffer to base 64 is given in Appendix C. Finally, here’s the main function, createMapCache. resolve(lastDataURI); } else { // key not in local storage, use Google. promise(); }; } Displaying Google Maps | 35 lastKey keeps track of the last key we used (in local storage) so we can reply quickly to a repeated request. Similarly, lastDataURI is the value associated with the last key. Return a function that takes a latitude and a longitude. getMap is the function that does all the work.

Our approach will store the coordinates and data URI of the last-requested location in memory as JavaScript variables. When called, our lookup function will first check the last coordinates and return the stored data URI if the location matches. If the in-memory location does not match, we’ll check Chrome local storage. Only if that also fails will we go to the Google API. 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.

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.

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Learning jQuery Deferreds by Terry Jones


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