February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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30.7 Validation Using JSF Standard Validators
Validating input is an important step in collecting information from users. Validation helps prevent processing errors due to incomplete, incorrect or improperly formatted user input. For example, you may perform validation to ensure that all required fields contain data or that a zip-code field has the correct number of digits. The JSF Core Tag Library provides several standard validator components and allows you to create your own custom validators. Multiple validators can be specified for each input element. The validators are:
f:validateLength—determines whether a field contains an acceptable ...
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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.