【发布时间】：2020-01-23 14:37:10
【问题描述】：
每当表单无效时，它会自动将所有无效字段的边框变为红色。我怎样才能改变它的颜色呢......让我们说白色。
【问题讨论】：
【发布时间】：2020-01-23 14:37:10
【问题描述】：
嗯，我刚刚找到了答案。这就是你要做的：
new InputDecoration(
errorBorder: new OutlineInputBorder(
borderSide: new BorderSide(color: Colors.white, width: 0.0),
),
focusedErrorBorder: new OutlineInputBorder(
borderSide: new BorderSide(color: Colors.blue, width: 0.0),
),
);
【讨论】：
TextFormField(
decoration: InputDecoration(
errorBorder:
OutlineInputBorder(borderSide: BorderSide(color: Colors.white))),
);
【讨论】：
-
您好，这很有用。我在 Flutter 的文档中找不到自己。 InputBorder 和 OutlineInputBorder 有什么区别？ inputBorder 只是一个抽象函数吗？
请参考以下代码
您可以尝试任何一种解决方案
解决方案 1 - 禁用自动验证，仅在用户交互表单上开始验证。
class MainScreen extends StatelessWidget {
MainScreen({Key key}) : super(key: key);
final TextEditingController addressController = TextEditingController();
final FocusNode addressFocus = FocusNode();
final TextEditingController stateController = TextEditingController();
final FocusNode stateFocus = FocusNode();
final _validationKey = GlobalKey<FormState>();
int validateAddress(String address) {
String patttern = r'(^[a-zA-Z0-9 ,.-]*$)';
RegExp regExp = new RegExp(patttern);
if (address.isEmpty || address.length == 0) {
return 1;
} else if (address.length < 10) {
return 3;
} else {
return 0;
}
}
int validateState(String state) {
String patttern = r'(^[a-zA-Z0-9 ,.-]*$)';
RegExp regExp = new RegExp(patttern);
if (state.isEmpty || state.length == 0) {
return 1;
} else {
return 0;
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.lightBlue,
automaticallyImplyLeading: true,
leading: Icon(
Icons.arrow_back,
),
title: Text("Example"),
centerTitle: true,
),
body: Container(
padding: EdgeInsets.all(15.0),
child: Column(
children: [
Form(
key: _validationKey,
child: Column(
children: [
/* State */
TextFormField(
autovalidateMode: AutovalidateMode.onUserInteraction,
/* autovalidate is disabled */
controller: stateController,
inputFormatters: [
FilteringTextInputFormatter.deny(RegExp(r"\s\s")),
FilteringTextInputFormatter.deny(RegExp(
r'(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])')),
],
keyboardType: TextInputType.text,
maxLength: 160,
onChanged: (val) {},
maxLines: 1,
validator: (value) {
int res = validateAddress(value);
if (res == 1) {
return "Please enter state";
} else {
return null;
}
},
focusNode: stateFocus,
autofocus: false,
decoration: InputDecoration(
errorMaxLines: 3,
counterText: "",
filled: true,
fillColor: Colors.white,
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
disabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
border: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
),
),
errorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
)),
focusedErrorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
),
),
hintText: "Enter state" ?? "",
),
),
SizedBox(
height: 15.0,
),
/* Address */
TextFormField(
autovalidateMode: AutovalidateMode.onUserInteraction,
/* autovalidate is disabled */
controller: addressController,
inputFormatters: [
FilteringTextInputFormatter.deny(RegExp(r"\s\s")),
FilteringTextInputFormatter.deny(RegExp(
r'(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])')),
],
keyboardType: TextInputType.text,
maxLength: 60,
onChanged: (val) {},
maxLines: 1,
validator: (value) {
int res = validateAddress(value);
if (res == 1) {
return "Please enter address";
} else if (res == 3) {
return "Please enter minimum 10 characters";
} else {
return null;
}
},
focusNode: addressFocus,
autofocus: false,
decoration: InputDecoration(
errorMaxLines: 3,
counterText: "",
filled: true,
fillColor: Colors.white,
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
disabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
border: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
),
),
errorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
)),
focusedErrorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
),
),
hintText: "Enter address" ?? "",
),
),
],
),
),
SizedBox(
height: 15.0,
),
OutlinedButton(
onPressed: () {
_validationKey.currentState.validate();
if (stateController.text.isEmpty) {
stateFocus.requestFocus();
} else if (addressController.text.isEmpty ||
addressController.text.length < 10) {
addressFocus.requestFocus();
}
},
child: Text("Validate"),
)
],
),
),
);
}
}
解决方案 2 - 始终启用自动验证
class HomeScreen extends StatelessWidget {
HomeScreen({Key key}) : super(key: key);
final TextEditingController addressController = TextEditingController();
final FocusNode addressFocus = FocusNode();
final TextEditingController stateController = TextEditingController();
final FocusNode stateFocus = FocusNode();
final _validationKey = GlobalKey<FormState>();
int validateAddress(String address) {
String patttern = r'(^[a-zA-Z0-9 ,.-]*$)';
RegExp regExp = new RegExp(patttern);
if (address.isEmpty || address.length == 0) {
return 1;
} else if (address.length < 10) {
return 3;
} else {
return 0;
}
}
int validateState(String state) {
String patttern = r'(^[a-zA-Z0-9 ,.-]*$)';
RegExp regExp = new RegExp(patttern);
if (state.isEmpty || state.length == 0) {
return 1;
} else {
return 0;
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.lightBlue,
automaticallyImplyLeading: true,
leading: Icon(
Icons.arrow_back,
),
title: Text("Example"),
centerTitle: true,
),
body: Container(
padding: EdgeInsets.all(15.0),
child: Column(
children: [
Form(
key: _validationKey,
child: Column(
children: [
/* State */
TextFormField(
autovalidateMode: AutovalidateMode.always,
/* autovalidate is set to true */
controller: stateController,
inputFormatters: [
FilteringTextInputFormatter.deny(RegExp(r"\s\s")),
FilteringTextInputFormatter.deny(RegExp(
r'(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])')),
],
keyboardType: TextInputType.text,
maxLength: 160,
onChanged: (val) {},
maxLines: 1,
validator: (value) {
int res = validateAddress(value);
if (res == 1) {
return "Please enter state";
} else {
return null;
}
},
focusNode: stateFocus,
autofocus: false,
decoration: InputDecoration(
errorMaxLines: 3,
counterText: "",
filled: true,
fillColor: Colors.white,
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
disabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
border: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
),
),
errorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
)),
focusedErrorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
),
),
hintText: "Enter state" ?? "",
),
),
SizedBox(
height: 15.0,
),
/* Address */
TextFormField(
autovalidateMode: AutovalidateMode.always,
/* autovalidate is enabled */
controller: addressController,
inputFormatters: [
FilteringTextInputFormatter.deny(RegExp(r"\s\s")),
FilteringTextInputFormatter.deny(RegExp(
r'(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])')),
],
keyboardType: TextInputType.text,
maxLength: 60,
onChanged: (val) {},
maxLines: 1,
validator: (value) {
int res = validateAddress(value);
if (res == 1) {
return "Please enter address";
} else if (res == 3) {
return "Please enter minimum 10 characters";
} else {
return null;
}
},
focusNode: addressFocus,
autofocus: false,
decoration: InputDecoration(
errorMaxLines: 3,
counterText: "",
filled: true,
fillColor: Colors.white,
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
disabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Color(0xffE5E5E5),
),
),
border: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
),
),
errorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
)),
focusedErrorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(4)),
borderSide: BorderSide(
width: 1,
color: Colors.red,
),
),
hintText: "Enter address" ?? "",
),
),
],
),
),
SizedBox(
height: 15.0,
),
],
),
),
);
}
}
【讨论】：