August 2003
Beginner to intermediate
240 pages
7h 44m
English
Content preview from XForms Essentials
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Name
required
Synopsis
| Allowed values:any XPath expression; the result is interpreted as a boolean. |
Default value:false
|
This property signals whether a value is required in this node for the form to be considered valid. A node satisfies the required condition when it is convertible into a string with one or more characters.
Form controls take a hint from the required
property. Form controls are required to distinguish between valid and
invalid states, and satisfying this property is a part of validity.
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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.