Question 391521 in Flutter Question posted in
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Flutter – What is the different between onInit and onReady and constructor of controller?

i want to understand complete way about this 3 methods
Calling class constructor, init, onready

i fould some users user different approch to fetch data,
sometime oninit sometime onready and sometime by class constructor

what are the differences?

class TransactionProvider extends GetxController {
  List<TransactionModel> _transactions = [];
  

  TransactionProvider() {
 
 fetchTransaction();
   
  }
  
  @override
  void onInit() {
    // TODO: implement onInit
    super.onInit();
fetchTransaction();

  }
  
  @override
  void onReady() {
    // TODO: implement onReady
    super.onReady();
fetchTransaction();
 
  }
}

which willl

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2

Answers


  1. 0

    onInit()

    • Get called when the controller is created i.e. memory is allocated to the widget/controller.
    • Use this for initialize something for the controller.

    onReady()

    • Called 1 frame after onInit() i.e. Get called after the widget is rendered – on the screen.
    • Perfect place for events like snackBar, dialogs or async request.

    constructor()

    • Use the constructor for straightforward, synchronous initialization that does not involve heavy lifting or async operations
    • Ideal for injecting dependencies or setting initial values
    class TransactionProvider extends GetxController {
  List<TransactionModel> _transactions = [];
  final Dependency _dependency;
  
  // Constructor for dependency injection
  TransactionProvider(this._dependency) {
    // Simple initialization
    print('TransactionProvider Constructor');
  }
  
  @override
  void onInit() {
    super.onInit();
    // Initialize variables 
    //perform initial data fetch

    fetchTransaction();
    print('TransactionProvider onInit');
  }
  
  @override
  void onReady() {
    super.onReady();
    // Perform UI-dependent operations
    showWelcomeSnackbar();
    print('TransactionProvider onReady');
  }
  
  void fetchTransaction() async {
    // Asynchronous data fetching
    _transactions = await _dependency.getTransactions();
  }
  
  void showWelcomeSnackbar() {
    // Show a snackbar
    Get.snackbar('Welcome', 'Transactions loaded!');
  }
}
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  2. 0

    onInit()

    It is called when the controller is loaded into memory

    onReady()

    It is called when the widget associated with the controller has been rendered.

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