如何将“material_tag_editor”中用户提交的标签数据添加到“Flutter Form Builder”表单中？
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【中文标题】如何将“material_tag_editor”中用户提交的标签数据添加到“Flutter Form Builder”表单中？【英文标题】：How to add user-submitted tags data from "material_tag_editor" into a "Flutter Form Builder" form? 【发布时间】：2021-04-06 07:59:42 【问题描述】：我正在使用"Flutter Form Builder" package 4.0.2 构建一个表单并尝试添加两个字段，用户通过"material_tag_editor" package 0.0.6 输入“标签”
问题：当通过按下“发布”按钮提交表单时，不包括为这些“标签”表单字段（Q1 或 Q3）提交的数据（参见下面的控制台屏幕截图）。
注意“flutter: qFour: 30, qFive: sample answer to q5, qTen: sample answer to q10”这一行 - Q1 和 Q3 都不包括在内（我在单独的打印语句中添加了它们的数据，所以你会看到它们在控制台中 - 查找 >>> 行）。
这里是输入了示例标签的表单截图（iPhone 模拟器截图），以及带有按钮的表单底部：
代码如下：
import 'package:flutter/cupertino.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:streakers_journal_beta/screens/reviews_screen.dart';
import 'package:streakers_journal_beta/screens/welcome_screen.dart';
import 'package:streakers_journal_beta/models/user.dart';
import 'package:rflutter_alert/rflutter_alert.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';
// BEGIN code from material_tag_editor
import 'package:material_tag_editor/tag_editor.dart';
import 'package:material_tag_editor/tag_editor_layout_delegate.dart';
import 'package:material_tag_editor/tag_layout.dart';
import 'package:material_tag_editor/tag_render_layout_box.dart';
// END code from material_tag_editor
//import 'dart:html';
//import 'dart:convert';
// This is the stateful widget that the main application instantiates, per https://api.flutter.dev/flutter/widgets/Form-class.html
class SandboxWriteReviewScreen extends StatefulWidget
// BEGIN code from material_tag_editor
final String title = 'Material Tag Editor Demo';
// END code from material_tag_editor
@override
_SandboxWriteReviewScreenState createState() =>
_SandboxWriteReviewScreenState();
// This is the private State class that goes with WriteReviewScreen
class _SandboxWriteReviewScreenState extends State<SandboxWriteReviewScreen>
var data;
AutovalidateMode autovalidateMode = AutovalidateMode.always;
bool readOnly = false;
bool showSegmentedControl = true;
//final _newFormbuilderKey = GlobalKey<FormState>();
final _newnewFormbuilderKey = GlobalKey<FormBuilderState>();
// above "GlobalKey" lets us generate a unique, app-wide ID that we can associate with our form, per https://fluttercrashcourse.com/blog/realistic-forms-part1
final ValueChanged _onChanged = (val) => print(val);
// BEGIN related to FormBuilderTextField in form below
final _ageController = TextEditingController(text: '45');
bool _ageHasError = false;
// END related to FormBuilderTextField in form below
String qEleven;
String qTwelve;
// BEGIN code from material_tag_editor
List<String> qOne = [];
final FocusNode _focusNode = FocusNode();
onDelete(index)
setState(()
qOne.removeAt(index);
);
// below = reiteration for cons
List<String> qThree = [];
//final FocusNode _focusNode = FocusNode();
uponDelete(index)
// NOTE: "uponDelete" for cons vs. "onDelete" for pros
setState(()
qThree.removeAt(index);
);
// END code from material_tag_editor
//final _user = User();
List<bool> isSelected;
int starIconColor =
0xffFFB900; // was 0xffFFB900; 0xffD49428 is from this image: https://images.liveauctioneers.com/houses/logos/lg/bartonsauction550_large.jpg?auto=webp&format=pjpg&width=140
@override
void initState()
//isSelected = [true, false];
super.initState();
@override
Widget build(BuildContext context)
return Scaffold(
appBar: AppBar(
actions: [
Padding(
padding: EdgeInsets.only(right: 12.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
IconButton(
icon: Icon(Icons.keyboard_backspace),
onPressed: ()
Navigator.pop(context);
,
),
Text(
'back',
style: TextStyle(
fontSize: 7,
),
),
],
),
),
],
leading: Icon(
Icons.rate_review,
color: Colors.black54,
),
title: Column(
children: [
Text(
'SANDBOX Write a Review',
style: TextStyle(
color: Colors.white,
fontSize: 16,
),
),
SizedBox(
height: 6.0,
),
Text(
'flutter_form_builder ^4.0.2',
style: TextStyle(
color: Colors.limeAccent,
fontSize: 14,
),
),
SizedBox(
height: 6.0,
),
],
),
// BEGIN appBar gradient code, per https://medium.com/flutter-community/how-to-improve-your-flutter-application-with-gradient-designs-63180ba96124
flexibleSpace: Container(
decoration: BoxDecoration(
color: Colors.indigoAccent,
),
),
backgroundColor: Colors.white,
centerTitle: false,
),
body: SingleChildScrollView(
child: Container(
child: Builder(
builder: (context) => FormBuilder(
// was "builder: (context) => Form("
key: _newnewFormbuilderKey,
initialValue:
'date': DateTime.now(),
,
child: Padding(
padding: const EdgeInsets.all(14.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
SizedBox(
height: 12.0,
),
RichText(
text: TextSpan(
style: TextStyle(
color: Colors.blue,
),
children: <TextSpan>[
TextSpan(
text:
'Q1 via TagEditor', // was 'What are 3 good or positive things about the house, property or neighborhood?', // [ 1 ]
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 16.0,
),
),
TextSpan(
text: ' (optional)',
style: TextStyle(
fontWeight: FontWeight.normal,
fontStyle: FontStyle.italic,
fontSize: 14.0,
color: Colors.black54,
), // was 'misleading or inaccurate?',
),
],
),
),
// BEGIN code from material_tag_editor
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: TagEditor(
length: qOne.length,
delimiters: [
','
], // was delimiters: [',', ' '], Also tried "return" ('\u2386',) and '\u2386'
hasAddButton: true,
textInputAction: TextInputAction
.next, // moves user from one field to the next!!!!
autofocus: false,
maxLines: 1,
// focusedBorder: OutlineInputBorder(
// borderSide: BorderSide(color: Colors.lightBlue),
// borderRadius: BorderRadius.circular(20.0),
// ),
inputDecoration: const InputDecoration(
// below was "border: InputBorder.none,"
isDense: true,
border: OutlineInputBorder(
borderRadius: const BorderRadius.all(
const Radius.circular(20.0),
),
),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.lightBlue),
borderRadius: const BorderRadius.all(
const Radius.circular(20.0),
),
// above is per https://github.com/flutter/flutter/issues/5191
),
labelText: 'separate, with, commas',
labelStyle: TextStyle(
fontStyle: FontStyle.italic,
backgroundColor:
Color(0x65dffd02), // was Color(0xffDDFDFC),
color: Colors.black87, // was Color(0xffD82E6D),
fontSize: 14,
),
),
onTagChanged: (value)
setState(()
qOne.add(value);
);
,
tagBuilder: (context, index) => _Chip(
index: index,
label: qOne[index],
onDeleted: onDelete,
),
),
),
// END code from material_tag_editor
SuperDivider(),
// END Chips Input
RichText(
text: TextSpan(
style: TextStyle(
color: Colors.blue,
),
children: <TextSpan>[
TextSpan(
text:
'Q3 via TagEditor (skipped Q2, for simplicity)', // [ 2 ] was 'List up to 3 negatives, or things you don’t like, about the house, property or neighborhood:',
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 16.0,
),
),
TextSpan(
text: '(optional)', // was text: '\n(optional)',
style: TextStyle(
fontWeight: FontWeight.normal,
fontStyle: FontStyle.italic,
fontSize: 14.0,
backgroundColor:
Color(0x70DDFDFC), // was Color(0x30F8A0A2),
color: Colors.black54, // was Color(0xffD82E6D),
//color: Colors.black54,
), // was 'misleading or inaccurate?',
),
],
),
),
// BEGIN code from material_tag_editor
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: TagEditor(
length: qThree.length,
delimiters: [','], // was delimiters: [',', ' '],
hasAddButton: true,
textInputAction: TextInputAction
.next, // moves user from one field to the next!!!!
autofocus: false,
maxLines: 1,
// focusedBorder: OutlineInputBorder(
// borderSide: BorderSide(color: Colors.lightBlue),
// borderRadius: BorderRadius.circular(20.0),
// ),
inputDecoration: const InputDecoration(
// below was "border: InputBorder.none,"
isDense: true,
border: OutlineInputBorder(
borderRadius: const BorderRadius.all(
const Radius.circular(20.0),
),
),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.lightBlue),
borderRadius: const BorderRadius.all(
const Radius.circular(20.0),
),
// above is per https://github.com/flutter/flutter/issues/5191
),
labelText: 'separate, with, commas',
labelStyle: TextStyle(
fontStyle: FontStyle.italic,
backgroundColor:
Color(0x65dffd02), // was Color(0xffDDFDFC),
color: Colors.black87, // was Color(0xffD82E6D),
fontSize: 14,
),
),
onTagChanged: (value)
setState(()
qThree.add(value);
);
,
tagBuilder: (context, index) => _Chip(
index: index,
label: qThree[index],
onDeleted: uponDelete,
),
),
),
// END code from material_tag_editor
SuperDivider(),
RichText(
text: TextSpan(
style: TextStyle(
color: Colors.blue,
),
children: <TextSpan>[
TextSpan(
text:
'Q4 - via FormBuilder\'s FormBuilderRadioGroup', // [ 3 ]
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 16.0,
),
),
TextSpan(
text: ' (required)',
style: TextStyle(
fontWeight: FontWeight.normal,
fontStyle: FontStyle.italic,
fontSize: 14.0,
color: Colors.red[700],
), // was 'misleading or inaccurate?',
),
],
),
),
FormBuilderRadioGroup(
name: 'qFour',
decoration: const InputDecoration(
border: InputBorder.none,
labelStyle: TextStyle(fontStyle: FontStyle.italic),
),
wrapVerticalDirection: VerticalDirection.down,
// orientation: GroupedRadioOrientation.vertical,
orientation: OptionsOrientation.vertical,
onChanged: _onChanged,
options: [
FormBuilderFieldOption(
value: '0', child: Text('Never')),
FormBuilderFieldOption(
value: '30', child: Text('Within the last month')),
FormBuilderFieldOption(
value: '180',
child: Text('Within the last 6 months')),
FormBuilderFieldOption(
value: '181',
child: Text('More than 6 months ago')),
],
),
SuperDivider(),
Center(
child: RichText(
text: TextSpan(
style: TextStyle(
color: Colors.blue,
),
children: <TextSpan>[
TextSpan(
text:
'Q5 - via FormBuilder\'s FormBuilderTextField', // [ 4 ]
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 16.0,
),
),
TextSpan(
text: ' (optional)',
style: TextStyle(
fontWeight: FontWeight.normal,
fontStyle: FontStyle.italic,
fontSize: 14.0,
color: Colors.black54,
), // was 'misleading or inaccurate?',
),
],
),
),
),
GavTextField(
maxCharLength: 200,
fieldAttribute: 'qFive',
fieldLabelText: '',
),
SuperDivider(),
RichText(
text: TextSpan(
style: TextStyle(
color: Colors.blue,
),
children: <TextSpan>[
TextSpan(
text:
'Q10 - via FormBuilder\'s FormBuilderTextField (skipped Q6 - Q9, for simplicity)', // [ 9 ]
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 16.0,
),
),
TextSpan(
text: ' (optional)',
style: TextStyle(
fontWeight: FontWeight.normal,
fontStyle: FontStyle.italic,
fontSize: 14.0,
color: Colors.black54,
), // was 'misleading or inaccurate?',
),
],
),
),
GavTextField(
maxCharLength: 1200,
fieldAttribute: 'qTen',
fieldLabelText:
'Be honest & kind.', // was 'Be honest, but kind.',
),
SuperDivider(),
Padding(
padding: const EdgeInsets.symmetric(vertical: 16.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ElevatedButton(
style: ElevatedButton.styleFrom(
primary: Colors.purple,
padding: EdgeInsets.symmetric(
horizontal: 50, vertical: 20),
textStyle: TextStyle(
fontSize: 20, fontWeight: FontWeight.bold)),
onPressed: ()
_newnewFormbuilderKey.currentState.save();
if (_newnewFormbuilderKey.currentState
.validate())
print(_newnewFormbuilderKey.currentState.value);
print(
' >>> Q1\'s value via separate print: $qOne',
);
print(
' >>> Q3\'s value via separate print: $qThree',
);
else
print("validation failed");
,
child: Text(
'Post',
style: TextStyle(
color: Colors.white,
fontSize: 20,
),
),
),
],
),
),
SizedBox(
height: 200.0,
),
],
),
),
),
),
),
),
);
class GavTextField extends StatelessWidget
GavTextField(
@required this.maxCharLength,
@required this.fieldAttribute,
@required this.fieldLabelText);
int maxCharLength;
String fieldAttribute;
String fieldLabelText;
@override
Widget build(BuildContext context)
return Padding(
padding: const EdgeInsets.only(top: 16.0),
child: FormBuilderTextField(
name: '$fieldAttribute',
// BEGIN countdown to max number of characters, per https://***.com/a/64035861/1459653
maxLength: maxCharLength,
maxLines: null,
buildCounter: (
BuildContext context,
int currentLength,
int maxLength,
bool isFocused,
)
return Text(
'$maxLength - currentLength',
);
,
// END countdown to max number of characters, per https://***.com/a/64035861/1459653
decoration: InputDecoration(
labelText:
'$fieldLabelText', // was " Separate items, with, commas",
//counterText: _textController.text.length.toString(),
labelStyle: TextStyle(
fontSize: 12.5,
fontStyle: FontStyle.italic,
),
//helperText: 'Separate, with, commas',
//floatingLabelBehavior: ,
// filled: true,
// fillColor: Colors.lightBlue.withOpacity(0.05),
// BEGIN change border if focus
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.lightBlue),
borderRadius: BorderRadius.circular(20.0),
),
// END change border if focus
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(20.0),
borderSide: BorderSide(),
),
),
textInputAction:
TextInputAction.next, // moves user from one field to the next!!!!
autofocus:
false, // on screen load, first text field is already active - user can just start typing
),
);
//</formstate>`
var alertStyle = AlertStyle(
animationType: AnimationType.fromTop,
isCloseButton: true,
isOverlayTapDismiss: true,
descTextAlign: TextAlign.start,
alertBorder: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20.0),
side: BorderSide(
color: Colors.grey,
),
),
titleStyle: TextStyle(
fontWeight: FontWeight.normal,
fontStyle: FontStyle.italic,
fontSize: 16,
color: Colors.black54,
),
alertAlignment: Alignment.topCenter,
);
// BEGIN code from material_tag_editor
class _Chip extends StatelessWidget
const _Chip(
@required this.label,
@required this.onDeleted,
@required this.index,
);
final String label;
final ValueChanged<int> onDeleted;
final int index;
@override
Widget build(BuildContext context)
return Chip(
backgroundColor: Colors.blueGrey.shade100,
labelPadding: const EdgeInsets.only(left: 8.0),
label: Text(label),
deleteIcon: Icon(
Icons.cancel_rounded, // was "Icons.close,"
size: 18,
),
onDeleted: ()
onDeleted(index);
,
);
// END code from material_tag_editor
class SuperDivider extends StatelessWidget
@override
Widget build(BuildContext context)
return Padding(
padding: const EdgeInsets.only(
top: 4.0,
bottom: 4.0,
),
child: const Divider(
color: Colors.white70,
height: 30,
thickness: 0.1,
indent: 0,
endIndent: 0,
),
);
【问题讨论】：
【参考方案1】：Flutter 表单构建器假定只会使用子表单，只要它们的值发生更改，就会自动更新祖先表单。但是由于标签生成器不是表单小部件，您可以做两件事 -
-
将这些小部件包装在一个新的表单小部件中，该小部件的职责是只向祖先窗体发送更新并呈现其子窗体。
你可以这样做
class GenericFormWidget<T> extends StatefulWidget
GenericFormWidget(
Key key,
@required this.attribute,
@required this.builder,
) : super(key: key);
final String attribute;
final Function(BuildContext, Function(T value)) builder;
@override
Widget build(BuildContext context)
return widget.builder(context, _updateValue);
void _updateValue(T value) =>
_formState.setAttributeValue(widget.attribute, value);
-
您可以使用 Flutter 表单并使用材质小部件创建自己的字段 UI，而不是使用 Flutter 表单构建器。这对您来说成本很高，因为您还需要迁移现有字段。
【讨论】：
您是否有使用 v4.x.x 对此的更新响应？以上是关于如何将“material_tag_editor”中用户提交的标签数据添加到“Flutter Form Builder”表单中？的主要内容，如果未能解决你的问题，请参考以下文章