我正在尝试创建带有列的表单。
例如,表单=>列=>文本字段,
TextFields将具有验证器。 另外,TextFields会进行修饰。
但是当我单击RaisedButton时,在TextField上找不到错误。 尽管TextFormField中的返回已成功执行。 (我使用调试器进行了检查)
到目前为止,我所引用的链接如下: https://www.youtube.com/watch?v=xiEYNzU4bDg
https://iirokrankka.com/2017/10/17/validating-forms-in-flutter/
https://medium.com/@nitishk72/form-validation-in-flutter-d762fbc9212c
下面是我的代码,请帮助我解决此问题
import 'package:flutter/material.dart';
class Profile extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return new ProfileState();
} //createState closes here....
} //Profile closes here.....
class ProfileState extends State<Profile> {
@override
Widget build(BuildContext context) {
final _formKey = GlobalKey<FormState>();
return new Scaffold(
appBar: new AppBar(title: new Text("Profile")),
body: Form(
key: _formKey,
child: new Column(
children: <Widget>[
//Full Name TextGormFeild goes below....
new TextFormField(
validator: (String value) {
if (value.isEmpty) {
return "Full name cannot be empty.";//Control comes here when I check using the Debugger.
} //if(value.isEmpty) closes here....
},
keyboardType: TextInputType.text,
textInputAction: TextInputAction.next,
maxLines: 1,
decoration: InputDecoration(
border: new OutlineInputBorder(
borderSide: new BorderSide(color: Colors.grey)),
hintText: "Enter name")),
new RaisedButton(
child: new Text("Test"),
onPressed: () {
setState(() {
if (_formKey.currentState.validate()) {
print("Validations are correct.");
}
});
},
)
],
),
)
//,
// helperText: "Enter full name"
);
} //build closes here.....
} //ProfileState closes here....
我以前使用的是helperText,但是我将其删除了。
答案 0 :(得分:1)
尝试从onPressed上移除setState
setState(() {
});
仅放置
if (_formKey.currentState.validate()) {
print("Validations are correct.");
}
像下面这样:
onPressed: () {
if (_formKey.currentState.validate()) {
print("Validations are correct.");
}
},