September 2019
Beginner
512 pages
12h 52m
English
Content preview from Flutter for Beginners
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FormField and TextField
The FormField widget works as a base class to create our own form field, used to integrate the Form widget. Its functions are as follows:
- To help the process of setting and retrieving the current input value
- To validate the current input value
- To provide feedback from validations
FormField can live without Form widgets, but this isn't typical – only when we have, let's say, a single FormField onscreen.
Many built-in input widgets from Flutter come with a corresponding FormField widget implementation. For example, TextField widget has the TextFormField. The TextFormField widget helps with access to the TextField value and also adds Form related behaviors to it (such as, validation).
A TextField widget lets the user ...
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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.