Stage 2 · Lesson 8 of 10
Form, TextFormField and validation
A Form groups TextFormField , its fields, together. A GlobalKey<FormState> lets you call validate() and save() on all of them at once. Each field takes a validator that returns an error message, or null when the text is fine.
Set keyboardType, obscureText for passwords, textInputAction to move to the next field, and autofillHints so password managers work. Use a TextEditingController when you need to read or set the text, and a FocusNode to move the focus between fields.
Scaffold makes for the keyboard by default, but the content must scroll so the field being typed in stays visible.
Common trapshowing errors on every keystroke from the first letter; autovalidateMode set to onUserInteraction is gentler.
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Resources for this stage
Start with
- GuideFreeFlutter Documentation
Google
Do the first Flutter app codelab, then the layout, constraints and lists pages