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Flutter for Beginners

You're reading from   Flutter for Beginners An introductory guide to building cross-platform mobile applications with Flutter and Dart 2

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Product type Paperback
Published in Sep 2019
Publisher Packt
ISBN-13 9781788996082
Length 512 pages
Edition 1st Edition
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Author (1):
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Alessandro Biessek Alessandro Biessek
Author Profile Icon Alessandro Biessek
Alessandro Biessek
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Table of Contents (21) Chapters Close

Preface 1. Section 1: Introduction to Dart FREE CHAPTER
2. An Introduction to Dart 3. Intermediate Dart Programming 4. An Introduction to Flutter 5. Section 2: The Flutter User Interface - Everything is a Widget
6. Widgets: Building Layouts in Flutter 7. Handling User Input and Gestures 8. Theming and Styling 9. Routing: Navigating between Screens 10. Section 3: Developing Fully Featured Apps
11. Firebase Plugins 12. Developing Your Own Flutter Plugin 13. Accessing Device Features from the Flutter App 14. Platform Views and Map Integration 15. Section 4: Advanced Flutter - Resources to Complex Apps
16. Testing, Debugging, and Deployment 17. Improving User Experience 18. Widget Graphic Manipulations 19. Animations 20. Other Books You May Enjoy

Validating Input (Forms)

Handling multiple FormField widgets is OK when talking about few values, but when the quantity of data grows, organizing it onscreen, validating everything properly, and providing user feedback promptly can all become harder. That's why Flutter provides the Form widget.

Validating user input

Validating user input is one of the main functions of the Form widget. In order to make the data input entered by the user consistent, it is fundamental to check it, as the user probably does not know all the allowed values.

The Form widget, combined with FormField instances, helps the developer to show an appropriate error message if some input values need to be corrected before saving the form data through...

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