Question
Answer and Explanation
Implementing a GoRouter example with login and register functionality involves setting up routes, handling authentication state, and creating UI components for login and registration. Here's a breakdown of how you can achieve this:
1. Set up GoRouter:
- First, you need to define your routes using GoRouter. This includes routes for the login page, registration page, and the main application page. You'll also need a way to check if a user is authenticated before allowing access to certain routes.
2. Authentication State Management:
- You'll need a mechanism to manage the user's authentication state. This could be a simple boolean flag or a more complex state management solution like Provider or Riverpod. The GoRouter's `redirect` function will use this state to determine which route to navigate to.
3. Login and Register Pages:
- Create separate UI components for the login and registration pages. These pages will contain forms for user input and logic to handle authentication requests.
4. Example Code Snippets:
// Example using a simple boolean for authentication state
bool _isAuthenticated = false;
// Define routes
final _router = GoRouter(
redirect: (context, state) {
if (!_isAuthenticated) {
if (state.location != '/login' && state.location != '/register') {
return '/login';
}
}
return null;
},
routes: [
GoRoute(
path: '/',
builder: (context, state) => HomePage(),
),
GoRoute(
path: '/login',
builder: (context, state) => LoginPage(),
),
GoRoute(
path: '/register',
builder: (context, state) => RegisterPage(),
),
],
);
// Example Login Function
void login(String username, String password) {
// Perform authentication logic here
if (username == 'test' && password == 'password') {
_isAuthenticated = true;
_router.go('/'); // Navigate to home page after successful login
}
}
5. Navigation:
- Use `context.go('/route')` or `context.push('/route')` to navigate between pages. After successful login or registration, navigate the user to the main application page.
6. Logout:
- Implement a logout function that sets the authentication state to false and navigates the user back to the login page.
7. Error Handling:
- Handle errors gracefully, such as invalid login credentials or registration failures, and provide feedback to the user.
By following these steps, you can create a robust authentication flow using GoRouter. Remember to adapt the code snippets to your specific needs and consider using a more advanced state management solution for larger applications.