April 2013
Intermediate to advanced
264 pages
7h 44m
English
Content preview from The Modern WebBecome 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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The Constraint Validation API
Native form validation is great, but at times you may want to do more with it by perhaps adding some custom validation or creating your own error-reporting framework. The Constraint Validation API has a series of objects, properties, and methods aimed at giving you the flexibility to extend the browser’s validation system or to roll your own.
The first property is willValidate, which returns true or false if the element it’s called on will be validated—not if its value is valid, but if the validation process will be applied. You might find it more useful to think of the property as willBeValidated. By default, all form elements return true, unless they are explicitly set not to—for example, by using the disabled ...
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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.