How to programmatically make keyboard textfield open

Question

Hi I was wondering if it was possible in flutter to programatically open up the keyboard as well as have the cursor and the textfield ready type straight away.

I already know how to pull up the keyboard FocusScope.of(context).requestFocus(FocusNode());

But I also need to know how to make the textfield ready to type without the users having to tap the textfield. as in

Lets say I have a textfield:

TextField(
  controller: textEditingController,
);

I would like to use code to the effect below so that the user dons't have to tap the textfield

textEditingController.openTextField()//Pseudo code

: Edit -----------------------------------

Bit bad of me but I forgot to add the focus node as a parameter on the textfield

Within your class add

final FocusNode _focusNode = FocusNode();

then add to textfield

TextField(
  ...
  focusNode:_focusNode,
  ...
);

then call it by running

_focusNode.requestFocus();

user_10498374 · Answer

First, you need to define FocusNode variable and assign it to your TextField like this :

//in header class
FocusNode focusNode  = FocusNode ();

//in build method
TextField(focusNode: focusNode,)

Then use this code:

FocusScope.of(context).requestFocus(focusNode);

Admin · Answer

full code below, this code make TextField focused and opens the keyboard

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() => runApp(App());

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(home: HomeScreen());
}

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State {

  final TextEditingController _controller = TextEditingController();
  final FocusNode _focusNode = FocusNode();

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _focusNode.requestFocus();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: TextField(
        focusNode: _focusNode,
        controller: _controller,
      ),
    );
  }

  @override
  void dispose() {
    _focusNode.dispose();
    _controller.dispose();
    super.dispose();
  }
}

user_5106574 · Answer

StatefulWidget will come to rescue. WidgetsBinding have addPostFrameCallback() method that will be called once Widget Build() is peformed. so inside initState() we can do magic with it

With nextFocus:

 @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      FocusScope.of(context).nextFocus();
    });
  }

TextField Code:

Scaffold(
        appBar: AppBar(),
        body: TextField(),
      ),

With FocusNode :

 FocusNode focusNode = FocusNode();

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      FocusScope.of(context).requestFocus(focusNode);
    });
  }

Use:

Scaffold(
        appBar: AppBar(),
        body: TextField(
          focusNode: focusNode,
        ),
      ),

Output:

How to programmatically make keyboard textfield open

3 Answers