September 2013
Beginner to intermediate
480 pages
9h 59m
English
Content preview from HTML5 Data and Services CookbookBecome 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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Using asynchronous server-side validation
Many validation checks can only be performed at the server side. The following are the examples:
- When validating a user registration form, we need to check if the entered username is available
- When the user enters a postal address, we might need to ask an external service to verify if the address is correct
The problem with server-side validation checks is that they need to be asynchronous. As a result, they cannot be written in JavaScript as functions that return validation results.
To solve this problem, in this recipe we're going to make a validator that uses the continuation-passing style. The example has a username input field that is validated against the server. The server checks if the username is ...
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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.