Welcome to read another article of mine Customized widget series. In this series, I share some tips and code for creating reusable and advanced flutter widgets. I and many professionals use these widgets in production grade flutter apps. Now you can use them!
Table of contents
introduce
Are you tired of dealing with complex form fields in Flutter? Do you wish there was an easier way to handle form validation, error styling, and value changes without writing a lot of boilerplate code or messing with the forms API? I designed my own custom widget to make form processing in Flutter a breeze.
I recently shared some screenshots of tables die Apps on X (Twitter).
These forms contain validations for different field types, such as dropdown lists, text fields, date pickers, gender cards, etc.
A lot of people email me asking how to do this because not every widget has validation and syncing them can get very confusing.
Customize form fields✨
Introducing CustomFormField widget, wrapper FormField Accepted widgets validation, onSaved, onChanged callback etc.
and CustomFormFieldyou can easily manage form validation, error display, and value changes with minimal effort. No more struggling to use the preset FormField API to implement basic functionality. It provides a clean and intuitive way to work with form fields, allowing you to focus on building a great user experience.
It has built-in support for validation errors and you can style them as needed. Just wrap any child to add validation without worrying about form reactive logic. You can see it in the example below.
Custom value listener
this CustomFormField Need a way to keep the form in sync and allow it to be updated from anywhere using a controller. Due to the likely dynamic nature of the field, the most appropriate controller choice is ValueNotifierWhere CustomFormField. In order to listen to this custom controller, we also need a custom listener gadget.
this CustomValueListener Widgets are essential for effectively managing state changes CustomFormField. it listens to a ValueNotifier And trigger updates when values change to ensure that the status of form fields remains synchronized. This separation of concerns simplifies the code, making it cleaner and easier to maintain. Additionally, it handles the listener lifecycle, adding listeners during initialization and removing them upon disposal, thus preventing memory leaks and ensuring optimal performance. This approach allows for a more responsive and dynamic form handling experience in Flutter.
Program code
This is the key to it all, the code of this amazing widget. I decided to put it last to avoid confusion as it is important to understand its usage and benefits before implementing it. I’ve included this as a bullet point so I can update it in the future as needed.
production staff
If you like it, please keep following me because I have about 40 widgets like this and I will release more widgets like this.