August 2015
Beginner to intermediate
504 pages
17h 48m
English
Content preview from jQuery in Action, Third EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 13. Avoiding the callback hell with Deferred
This chapter covers
- What promises are and why they’re important
- The Deferred object
- How to manage multiple asynchronous operations
- Resolving and rejecting a promise
For a long time, JavaScript developers have used callback functions to perform several tasks such as running operations after a given amount of time (using set-Timeout()), or at regular intervals (using setInterval()), or to react to a given event (click, keypress, load, and so on). We’ve discussed and employed callbacks extensively to perform asynchronous operations; for example, in chapter 6 where we focused on events, in chapter 8 when we talked about animations, and in chapter 10 where we covered Ajax. Callback functions ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.