Flutter 如何根据在颤振中选择的下拉项添加文本字段值
在这里,当我从下拉列表中选择值时,国家/地区代码文本字段值将根据选择的下拉列表项进行更改,在本例中,当我从下拉列表中选择美国时,我有一些静态值。国家代码值自动更改为+1,当我从下拉列表中选择印度时,国家代码将更改为+91 这是输出的图像,因此您可以获得更好的想法 这是我试过的代码Flutter 如何根据在颤振中选择的下拉项添加文本字段值,flutter,drop-down-menu,selection,textfield,flutter-layout,Flutter,Drop Down Menu,Selection,Textfield,Flutter Layout,在这里,当我从下拉列表中选择值时,国家/地区代码文本字段值将根据选择的下拉列表项进行更改,在本例中,当我从下拉列表中选择美国时,我有一些静态值。国家代码值自动更改为+1,当我从下拉列表中选择印度时,国家代码将更改为+91 这是输出的图像,因此您可以获得更好的想法 这是我试过的代码 import 'package:flutter/gestures.dart'; import 'package:flutter/material.dart'; import 'package:flutter/serv
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_masked_text/flutter_masked_text.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:tudo/src/modules/signup/index.dart';
import 'package:tudo/src/utils/app_constants_value.dart';
import 'package:tudo/src/utils/roundrectbutton.dart';
class SignupScreen extends StatefulWidget {
const SignupScreen({
Key key,
@required SignupBloc signupBloc,
}) : _signupBloc = signupBloc,
super(key: key);
final SignupBloc _signupBloc;
@override
SignupScreenState createState() {
return new SignupScreenState(_signupBloc);
}
}
class SignupScreenState extends State<SignupScreen> {
final SignupBloc _signupBloc;
SignupScreenState(this._signupBloc);
static final List<String> _dropdownItems = <String>['India', 'USA'];
final formKey = new GlobalKey<FormState>();
bool _validate = false;
Person person = new Person();
var controller = new MaskedTextController(mask: '(000) 000 0000');
String _dropdownValue = 'India';
String _countryCode = '+91';
String _errorText;
@override
void initState() {
super.initState();
this._signupBloc.dispatch(LoadSignupEvent());
}
@override
void dispose() {
super.dispose();
}
Widget _buildCountry() {
return FormField(
builder: (FormFieldState state) {
return DropdownButtonHideUnderline(
child: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
new InputDecorator(
decoration: InputDecoration(
filled: false,
hintText: 'Choose Country',
prefixIcon: Icon(Icons.location_on),
labelText:
_dropdownValue == null ? 'Where are you from' : 'From',
errorText: _errorText,
),
isEmpty: _dropdownValue == null,
child: new DropdownButton<String>(
value: _dropdownValue,
isDense: true,
onChanged: (String newValue) {
print('value change');
print(newValue);
person.country = newValue;
if (newValue == 'India') {
person.countryCode = '+91';
} else if (newValue == 'USA') {
person.countryCode = '+1';
} else {
person.countryCode = '+1';
}
setState(() {
_countryCode = person.countryCode;
_dropdownValue = person.country;
});
print('person.countryCode');
print('${person.countryCode}');
},
items: _dropdownItems.map((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
),
),
],
),
);
},
);
}
Widget _buildPhonefiled() {
return Row(
children: <Widget>[
new Expanded(
child: new TextFormField(
initialValue: _countryCode,
enabled: false,
decoration: InputDecoration(
filled: false,
prefixIcon: Icon(FontAwesomeIcons.globe),
labelText: AppConstantsValue.appConst['signup']['code']
['translation'],
hintText: "Country code",
),
// onSaved: (String value) {
// setState(() {
// _countryCode = person.countryCode;
// });
// },
),
flex: 2,
),
new SizedBox(
width: 10.0,
),
new Expanded(
child: new TextFormField(
controller: controller,
keyboardType: TextInputType.number,
decoration: InputDecoration(
filled: false,
labelText: AppConstantsValue.appConst['signup']['mobile']
['translation'],
hintText: "Mobile number",
prefixIcon: new Icon(Icons.mobile_screen_share),
),
onSaved: (String value) {
person.phoneNumber = value;
},
),
flex: 5,
),
],
);
}
Widget _buildSignupButton(BuildContext context) {
return GestureDetector(
child: RoundrectButton.buildRoundedRectButton(
AppConstantsValue.appConst['signup']['signup']['translation'],
signUpGradients,
false),
onTap: () {
// _submit();
final FormState form = formKey.currentState;
form.save();
if (form.validate() && person.termsAndCondition) {
Map<String, dynamic> signupdata = {
'countyCode': person.countryCode,
'phoneNumber': person.phoneNumber,
};
} else {
setState(() {
_validate = true;
});
}
},
);
}
@override
Widget build(BuildContext context) {
return SafeArea(
top: false,
bottom: false,
child: Form(
key: formKey,
autovalidate: _validate,
child: Scrollbar(
child: SingleChildScrollView(
dragStartBehavior: DragStartBehavior.down,
padding: const EdgeInsets.symmetric(horizontal: 16.0),
child: new Container(
margin: EdgeInsets.fromLTRB(30, 100, 30, 0),
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
_buildCountry(),
_buildPhonefiled(),
SizedBox(
height: 20.0,
),
_buildSignupButton(context),
],
),
),
),
),
),
);
}
}
class Person {
String email = '';
String country = '';
String countryCode = '';
String phoneNumber = '';
String firstname = '';
String lastname = '';
String password = '';
bool termsAndCondition = false;
}
import'package:flatter/signatures.dart';
进口“包装:颤振/材料.省道”;
导入“包:flifter/services.dart”;
导入“package:flatter_masked_text/flatter_masked_text.dart”;
导入“package:font_awesome_flatter/font_awesome_flatter.dart”;
导入“package:tudo/src/modules/signup/index.dart”;
导入“package:tudo/src/utils/app_constants_value.dart”;
导入“package:tudo/src/utils/roundrectbutton.dart”;
类SignupScreen扩展StatefulWidget{
屏幕上的常量符号({
关键点,
@所需的SignupBloc SignupBloc,
}):_signupBloc=signupBloc,
超级(键:键);
最终签署方(SignupBloc)u SignupBloc ;;
@凌驾
SignupScreenState createState(){
返回新的SignupScreenState(_signupBloc);
}
}
类SignupScreenState扩展状态{
最终签署方(SignupBloc)u SignupBloc ;;
SignupScreenState(本.\u signupBloc);
静态最终列表_dropdownItems=[“印度”、“美国”];
final formKey=new GlobalKey();
bool _validate=false;
Person=新人();
var控制器=新的MaskedTextController(掩码:'(000)000 0000');
字符串_dropdownValue='India';
字符串_countryCode='+91';
字符串错误文本;
@凌驾
void initState(){
super.initState();
此._signuploc.dispatch(LoadSignupEvent());
}
@凌驾
无效处置(){
super.dispose();
}
Widget_buildCountry(){
返回表单字段(
生成器:(FormFieldState){
返回DropdownButtonHideUnderline(
子:新列(
crossAxisAlignment:crossAxisAlignment.stretch,
儿童:[
新输入装饰器(
装饰:输入装饰(
填充:假,
hintText:“选择国家”,
前缀图标:图标(图标位置打开),
标签文本:
_dropdownValue==null?“您来自哪里?”:“来自”,
errorText:\u errorText,
),
isEmpty:_dropdownValue==null,
孩子:新的下拉按钮(
值:_dropdownValue,
是的,
onChanged:(字符串newValue){
打印(“值更改”);
打印(新值);
person.country=newValue;
如果(新值==‘印度’){
person.countryCode='+91';
}否则如果(newValue=='USA'){
person.countryCode='+1';
}否则{
person.countryCode='+1';
}
设置状态(){
_countryCode=person.countryCode;
_dropdownValue=person.country;
});
打印('person.countryCode');
打印(“${person.countryCode}”);
},
items:_dropdownItems.map((字符串值){
返回下拉菜单项(
价值:价值,
子项:文本(值),
);
}).toList(),
),
),
],
),
);
},
);
}
Widget_buildphonefield(){
返回行(
儿童:[
新扩展(
子项:新建TextFormField(
initialValue:\u countryCode,
启用:false,
装饰:输入装饰(
填充:假,
前缀:图标(FontAwesomeIcons.globe),
labelText:AppConstantValue.appConst['signup']['code']
[“翻译”],
hintText:“国家代码”,
),
//onSaved:(字符串值){
//设置状态(){
//\u countryCode=person.countryCode;
// });
// },
),
弹性:2,
),
新尺寸盒子(
宽度:10.0,
),
新扩展(
子项:新建TextFormField(
控制器:控制器,
键盘类型:TextInputType.number,
装饰:输入装饰(
填充:假,
labelText:AppConstantValue.appConst['signup']['mobile']
[“翻译”],
hintText:“手机号码”,
prefixIcon:新图标(图标、移动屏幕和共享),
),
onSaved:(字符串值){
person.phoneNumber=值;
},
),
弹性:5,
),
],
);
}
小部件构建签名按钮(构建上下文){
返回手势检测器(
子项:RoundrectButton.buildRoundedRectButton(
AppConstantsValue.appConst['signup']['signup']['translation'],
注册梯度,
假),,
onTap:(){
//_submit();
最终FormState表单=formKey.currentState;
form.save();
if(form.validate()&&person.termsAndCondition){
地图符号更新a={
“countyCode”:person.countryCode,
“phoneNumber”:person.phoneNumber,
};
}否则{
设置状态(){
_验证=真;
});
}
},
);
}
@凌驾
小部件构建(构建上下文){
返回安全区(
上图:错,
底部:错误,
孩子:表格(
key:formKey,
自动验证:_验证,
子:滚动条(
子:SingleChildScrollView(
import 'package:flutter/material.dart';
import 'package:flutter_masked_text/flutter_masked_text.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
// static final List<String> _dropdownItems = <String>['India', 'USA'];
static List<CountryModel> _dropdownItems = new List();
final formKey = new GlobalKey<FormState>();
var controller = new MaskedTextController(mask: '(000) 000 0000');
CountryModel _dropdownValue;
String _errorText;
TextEditingController phoneController = new TextEditingController();
@override
void initState() {
// TODO: implement initState
super.initState();
setState(() {
_dropdownItems.add(CountryModel(country: 'India', countryCode: '+91'));
_dropdownItems.add(CountryModel(country: 'USA', countryCode: '+1'));
_dropdownValue = _dropdownItems[0];
phoneController.text = _dropdownValue.countryCode;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text('Demo'),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
_buildCountry(),
_buildPhonefiled(),
],
),
),
);
}
Widget _buildCountry() {
return FormField(
builder: (FormFieldState state) {
return DropdownButtonHideUnderline(
child: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
new InputDecorator(
decoration: InputDecoration(
filled: false,
hintText: 'Choose Country',
prefixIcon: Icon(Icons.location_on),
labelText:
_dropdownValue == null ? 'Where are you from' : 'From',
errorText: _errorText,
),
isEmpty: _dropdownValue == null,
child: new DropdownButton<CountryModel>(
value: _dropdownValue,
isDense: true,
onChanged: (CountryModel newValue) {
print('value change');
print(newValue);
setState(() {
_dropdownValue = newValue;
phoneController.text = _dropdownValue.countryCode;
});
},
items: _dropdownItems.map((CountryModel value) {
return DropdownMenuItem<CountryModel>(
value: value,
child: Text(value.country),
);
}).toList(),
),
),
],
),
);
},
);
}
Widget _buildPhonefiled() {
return Row(
children: <Widget>[
new Expanded(
child: new TextFormField(
controller: phoneController,
enabled: false,
decoration: InputDecoration(
filled: false,
prefixIcon: Icon(FontAwesomeIcons.globe),
labelText: 'code',
hintText: "Country code",
),
),
flex: 2,
),
new SizedBox(
width: 10.0,
),
new Expanded(
child: new TextFormField(
controller: controller,
keyboardType: TextInputType.number,
decoration: InputDecoration(
filled: false,
labelText: 'mobile',
hintText: "Mobile number",
prefixIcon: new Icon(Icons.mobile_screen_share),
),
onSaved: (String value) {},
),
flex: 5,
),
],
);
}
}
class CountryModel {
String country = '';
String countryCode = '';
CountryModel({
this.country,
this.countryCode,
});
}