The TextField could not set the selection state?

[1169886116]

//PDA扫描得到的值,取出来处理一下,在赋值给输入框,在设置选中状态无效
onChanged: (str) {
//将输入框的值处理
String newStr = str.split("#").first;
//赋值输入框新值
_controller.text = newStr;
//设置新值的选中状态
_controller.selection = TextSelection(
baseOffset: 0,
extentOffset: numberStr.length,
);
}

The TextField could not set the selection state?

[pedromassangocode]

Hi @1169886116
Can you please provide your flutter doctor -v and a minimal complete reproducible code sample.
Thank you

[reazon7]

same issue...
change selection not working:
textController.selection = TextSelection.collapsed(offset: data.length);

Flutter (Channel stable, 1.20.1, on Microsoft Windows [Version 10.0.17134.1246], locale en-US)

[pedromassangocode]

Hi @reazon7
If you are facing this same issue please provide a minimal complete reproducible code sample to help us reproduce the issue.
Thank you.

[reazon7]

Hi @reazon7
If you are facing this same issue please provide a minimal complete reproducible code sample to help us reproduce the issue.
Thank you.

in my case,, it's not TextField but TextFormField that has the problem.

here's minimal code

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final TextEditingController _controller = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Testing'),
        ),
        body: TextFormField(
          controller: _controller,
          onChanged: (value) {
            String newData = 'asdqwe123';
            _controller.value = TextEditingValue(
              text: newData,
              selection: TextSelection.collapsed(offset: newData.length),
            );
          },
        ),
      ),
    );
  }
}

this happended after I upgraded flutter version to stable 1.20.1 (in stable 1.17.5 it's fine)...

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 1.20.1, on Microsoft Windows [Version 10.0.17134.1246], locale en-US)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[!] Android Studio (version 3.3)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[√] VS Code (version 1.47.3)
[√] Connected device (1 available)

[Omrankabalan]

Same happening to me after upgrading to stable 1.20.1

It was working perfectly in stable 1.17.5

[VivaThapelo]

Same problem.

Flutter upgrade broke [Example]:

 _cardNumberController.text += " ";
_cardNumberController.selection = TextSelection.collapsed(offset: 5);

the offset is always 0(zero), it ignores the 5

 TextFormField(
                        maxLengthEnforced: true,
                        maxLength: 19,
                        keyboardType: TextInputType.number,
                        controller: _cardNumberController,
                        onChanged: (value) {
                          switch (value.length) {
                            case 4:
                              {
                                _cardNumberController.text += " ";
                                _cardNumberController.selection = TextSelection.collapsed(offset: 5);
                                break;
                              }
                            case 9:
                              {
                                _cardNumberController.text += " ";
                                _cardNumberController.selection =  TextSelection.collapsed(offset: 10);
                                break;
                              }
                            case 14:
                              {
                                _cardNumberController.text += " ";
                                _cardNumberController.selection = TextSelection.collapsed(offset: 15);
                                break;
                              }
                          }
                          return null;
                        },
                        decoration: InputDecoration(
                            hintText: '5324 9087 5432 1234',
                            labelText: 'Card Number'),
                      ),

Flutter Doctor:

C:\Users\vivat\AndroidStudioProjects\ecash_pay>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel beta, 1.20.2, on Microsoft Windows [Version 10.0.19041.450], locale en-ZA)

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[√] Chrome - develop for the web
[√] Android Studio (version 4.0)
[!] VS Code (version 1.47.2)
    X Flutter extension not installed; install from
      https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[√] Connected device (3 available)

[pedromassangocode]

Hi @katlehotech
For me to help you solve this issue I need you to provide a code that I can just copy/paste and run it. Please provide such code.
Thank you

[Omrankabalan]

@pedromassangocode There is complete reproducible code added by @reazon7 9 days ago!

[1169886116]

import 'package:flutter/material.dart';

class TextFieldPage extends StatefulWidget {
@OverRide
_TextFieldPageState createState() => _TextFieldPageState();
}

class _TextFieldPageState extends State {
TextEditingController tfController = TextEditingController();
FocusNode tfNode = FocusNode();
@OverRide
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
centerTitle: true,
title: Text("选中状态"),
),
body: Center(
child: Column(
children: [
TextField(
controller: tfController,
focusNode: tfNode,
decoration: InputDecoration(
labelText: "用户名",
hintText: "用户名",
prefixIcon: Icon(Icons.person),
),
onChanged: (result) {
print("输入: $result");
},
onSubmitted: (result) {
print("提交: $result");
//赋值
// tfController.text = result;
//设置选中状态
tfController.selection = TextSelection(
baseOffset: 0, //开始位置
extentOffset: result.length, //长度
);
},
)
],
),
),
);
}
}

[1169886116]

Clicking submit cannot set the content to selected mode

[1169886116]

flutter SDK : [✓] Flutter (Channel stable, v1.9.1+hotfix.6, on Mac OS X 10.15.6 19G2021,
locale zh-Hans-CN)

[pedromassangocode]

@pedromassangocode There is complete reproducible code added by @reazon7 9 days ago!

The code he shared does not reproduce the actual issue!

[pedromassangocode]

Hi @1169886116
Could you please run flutter upgrade --force.
If the issue persists, please provide your updated flutter doctor -v and a minimal reproducible code sample.
Thank you

[VivaThapelo]

Just do a
> flutter downgrade
everything will work fine

[TahaTesser]

Without additional information, we are unfortunately not sure how to resolve this issue.
We are therefore reluctantly going to close this bug for now.
Please don't hesitate to comment on the bug if you have any more information for us; we will reopen it right away!
Thanks for your contribution.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.