flutter TextFormField validation display alignment error

Question

Saya memiliki TextFormFieldvalidasi dengan Empty.

Untuk mengontrol ketinggian, TextFormFieldditempatkan di dalam Containerwidget.

Yang menyebabkan efek samping tak terduga dari menampilkan pesan kesalahan tumpang tindih sebagai gambar terlampir.

untuk menguji kode sampel, tekan "Kirim" untuk melihat kesalahan.

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: SimpleForm(),
    );
  }
}

class SimpleForm extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final formKey = GlobalKey<FormState>();
    return SafeArea(
      child: Scaffold(
//          primary: true,
          body: Form(
            key: formKey,
            child: Column(
              children: [
                SizedBox(
                  height: 0,
                ),
//            Container(height: 0,),
                Container(
                  height: 38,
                  margin: EdgeInsets.all(6),
                  child: TextFormField(
                    maxLines: 1,
                    decoration: InputDecoration(
                      border: OutlineInputBorder(),
                      hintText: 'Name',
//                  errorStyle: TextStyle(fontSize: 0, height: 0),
                    ),
                    validator: (value) => (value.isEmpty) ? '**' : null,
                  ),
                ),
                FlatButton(
                  child: Text('Submit'),
                  onPressed: () {
                    formKey.currentState.validate();
                  },
                )
              ],
            ),
          )),
    );
  }
}

Answer 1

Solusi 1. Anda dapat mengatur helperTextuntuk TextField's decorationdan meningkatkan Container' s height:

Container(
  height: 60,
  child: TextFormField(
    maxLines: 1,
    decoration: InputDecoration(
      border: OutlineInputBorder(),
      hintText: 'Name',
      helperText: ' ', // this is new
    ),
    validator: (value) => (value.isEmpty) ? '**' : null,
  ),
),

Solusi 2. Anda dapat mengatur tinggi baris pesan kesalahan ke 0 (akan ditampilkan di atas bidang teks):

Container(
  height: 38,
  child: TextFormField(
    maxLines: 1,
    decoration: InputDecoration(
      border: OutlineInputBorder(),
      hintText: 'Name',
      errorStyle: TextStyle(height: 0), // this is new
    ),
    validator: (value) => (value.isEmpty) ? '**' : null,
  ),
),

Answer 2

Anda bisa menggunakan ini

   TextFormField(
  decoration: new InputDecoration(
  enabledBorder: OutlineInputBorder(                     //change border of enable textfield
  borderRadius: BorderRadius.all(Radius.circular(40.0)),
  borderSide: BorderSide(color: colorValue),),
        focusedBorder: OutlineInputBorder(        //focus boarder
          borderRadius: BorderRadius.all(Radius.circular(40.0)),
          borderSide: BorderSide(color: colorValue),
        ),
                 focusedBorder: OutlineInputBorder(
      borderRadius: BorderRadius.all(Radius.circular(4)),
      borderSide: BorderSide(width: 1,color: Colors.red),
    ),
    disabledBorder: OutlineInputBorder(
      borderRadius: BorderRadius.all(Radius.circular(4)),
      borderSide: BorderSide(width: 1,color: Colors.orange),
    ),
    enabledBorder: OutlineInputBorder(
      borderRadius: BorderRadius.all(Radius.circular(4)),
      borderSide: BorderSide(width: 1,color: Colors.green),
    ),
    border: OutlineInputBorder(
      borderRadius: BorderRadius.all(Radius.circular(4)),
      borderSide: BorderSide(width: 1,)
    ),
    errorBorder: OutlineInputBorder(.                              //error boarder
      borderRadius: BorderRadius.all(Radius.circular(4)),
      borderSide: BorderSide(width: 1,color: Colors.black)
    ),

        isDense: true,
        counterText: "",
        contentPadding: EdgeInsets.fromLTRB(10, 20, 10, 0),  //padding according to your need
        hintText: "create new",
        hintStyle: TextStyle(color: colorValue, fontSize: 13)),
  )),

Answer 3

Terima kasih atas jawabannya Mobina ,

Sepertinya masalah adalah batasan flutter. Untuk saat ini ..

dengan batas saya memutuskan untuk menampilkan pesan kesalahan di atas. (Solusi Anda: 1)

tanpa batas saya dapat menampilkan pesan err seperti biasa. (Solusi Anda: 2)

// with border
            Container(
              height: 38,
              margin: EdgeInsets.all(6),
              child: TextFormField(
                textAlignVertical: TextAlignVertical.bottom,
                style: TextStyle(fontSize: 14),
                decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  hintText: 'Name',
                  errorStyle: TextStyle(height: 0),
                ),
                validator: (value) => (value.isEmpty) ? 'hide overlap' : null,
              ),
            ),
// without border
            Container(
              height: 38,
              margin: EdgeInsets.all(6),
              child: TextFormField(
                textAlignVertical: TextAlignVertical.bottom,
                style: TextStyle(fontSize: 14),
                decoration: InputDecoration(
                  hintText: 'Name',
                  helperText: ' ',   isDense: true,
                  counterText: "",
                  contentPadding: EdgeInsets.fromLTRB(10, 30, 10, 0),
                ),
                validator: (value) => (value.isEmpty) ? 'hide overlap' : null,
              ),
            ),