Flutter textfield initial value not updating

by

Flutter TextField initial value not updating

In Flutter, the initial value of a TextField widget can be set using the TextEditingController class. The initial value is usually set in the initState() method of the StatefulWidget, and it can be updated dynamically by changing the value of the TextEditingController.

Here’s an example that demonstrates how to update the initial value of a TextField: 

    
import 'package:flutter/material.dart';

class MyTextField extends StatefulWidget {
  @override
  _MyTextFieldState createState() => _MyTextFieldState();
}

class _MyTextFieldState extends State {
  TextEditingController _controller = TextEditingController();

  @override
  void initState() {
    super.initState();
    _controller.text = 'Initial Value'; // Set the initial value here
  }

  @override
  void dispose() {
    _controller.dispose(); // dispose the controller
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return TextField(
      controller: _controller,
      onChanged: (value) {
        // Handle the changes here if necessary
      },
    );
  }
}

// Usage:
void main() {
  runApp(MaterialApp(
    home: Scaffold(
      body: Center(
        child: MyTextField(),
      ),
    ),
  ));
}

In the above example, the initial value of the TextField is set to “Initial Value” by assigning the value to the text property of the TextEditingController in the initState() method. The TextEditingController is disposed of in the dispose() method to avoid memory leaks.

With this approach, you can change the initial value dynamically by updating the value of the TextEditingController. For example, you can use a button to change the initial value when pressed: 

    
FlatButton(
  onPressed: () {
    setState(() {
      _controller.text = 'New Initial Value';
    });
  },
  child: Text('Change Initial Value'),
)

By calling setState and updating the value of the TextEditingController, the initial value of the TextField will be updated accordingly.

Remember to dispose of the TextEditingController when you no longer need it to avoid memory leaks.

Leave a comment