Question 1

How do I add custom validation in Flutter Form Builder?

Accepted Answer

Use FormBuilderValidators.compose with custom validator functions, or integrate separate validator packages. The README shows examples with required and email validators, and you can define logic based on other field values.

Question 2

Flutter Form Builder vs native Flutter forms – which is better for my app?

Accepted Answer

Flutter Form Builder speeds up development with pre-built widgets and validation, ideal for complex forms. Native forms offer more control for simple cases without extra dependencies, but require more boilerplate code.

Question 3

How to create a dynamic form where fields change based on user input?

Accepted Answer

Use conditional logic within the form builder, as shown in the 'Dynamic Fields' GIF and 'Conditional validation' code example, where fields appear or validate reactively using form state methods.

Question 4

Does Flutter Form Builder support internationalization (i18n) for labels and errors?

Accepted Answer

Yes, you can customize labels and error messages through the decoration parameter and validator functions, allowing integration with Flutter's i18n packages for localized text.

Question 5

What are common issues or bugs in Flutter Form Builder?

Accepted Answer

Common issues include managing GlobalKey states properly, handling validation errors programmatically, and dealing with breaking changes in updates, as noted in migration guides and GitHub issues.

Question 6

How to integrate Flutter Form Builder with state management like Provider?

Accepted Answer

You can wrap form widgets with Provider or use form state methods to sync data, but deep integration may require custom setups since the package focuses on form-specific state rather than app-wide management.

Form Builder

What is Form Builder?

Overview

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Pros & Cons

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Frequently Asked Questions