Flutter: How to create user registration widget

Are you looking for creating user registration widget in Flutter then this post will help you to learn how to create user registration widget step by step.

Setting up a user registration widget in Flutter involves several steps. Please follow below steps:

Step 1: Create a new Flutter project

To create a new Flutter project, open Android Studio or Visual Studio Code and select "Create New Project" from the start screen. Follow the prompts to create a new Flutter project.

Step 2: Add the necessary dependencies

To create a user registration widget in Flutter, you'll need to add the following dependencies to your pubspec.yaml file:

The flutter_form_builder package provides a set of form fields and validators to help you build complex forms. The firebase_auth package provides an interface for user authentication with Firebase.

Step 3: Create a new StatefulWidget

In Flutter, a StatefulWidget is used when the state of a widget needs to change dynamically. In this case, we need to create a StatefulWidget to handle the user registration form.

To create a new StatefulWidget, create a new Dart file and add the following code:

In this code, we create a new StatefulWidget called UserRegistration and define the _UserRegistrationState class to handle the state of the widget. We also define the build method to return a blank container for now.

Step 4: Add a Form widget

To create a user registration form in Flutter, we need to use the Form widget. The Form widget provides a way to manage and validate user input.

Add the following code to the _UserRegistrationState class to create a basic form:

In this code, we create a new GlobalKey called _formKey to uniquely identify the form. We then add the Form widget to the body of the Scaffold widget and pass the _formKey as a parameter.

Step 5: Add form fields

Now that we have a basic form set up, we can add the form fields for the user to enter their registration information.

Add the following code to the Column widget inside the Form widget:

In this code, we add two TextFormField widgets for the user to enter their email and password. We also add a RaisedButton widget to submit the form data.

Step 6: Implement form validation and submission

To make sure the user enters valid information in the form fields and to submit the data to a backend server, we need to implement form validation and submission.

Add the following code to the onPressed callback of the RaisedButton widget:

In this code, we define a new method called _submitForm to handle form submission. We check if the form is valid using the currentState.validate() method, which returns true if all the validators in the form return null.

If the form is valid, we can submit the data to the server. For example, if you're using Firebase Authentication, you can use the following code to create a new user account:

In this code, we create a new instance of the FirebaseAuth class and call the createUserWithEmailAndPassword method to create a new user account. We pass in the email and password entered by the user using two TextEditingController objects, which we define earlier in the _UserRegistrationState class:

We also wrap the _submitForm method in an async function because the createUserWithEmailAndPassword method returns a Future object.

Step 7: Update the form fields

To update the form fields with the values entered by the user, we need to connect the TextFormField widgets to the TextEditingController objects.

Add the following code to the TextFormField widgets:

In this code, we add the controller parameter to the TextFormField widgets and pass in the _emailController and _passwordController objects respectively. This connects the TextFormField widgets to the controllers and allows us to access the values entered by the user.

Step 8: Run the app

To test the user registration widget, save all the changes you've made to the code and run the app using the flutter run command in the terminal. You should be able to enter your email and password into the form fields and submit the data to the server.

That's it! You've successfully created a user registration widget in Flutter with form validation and submission.

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