我正在尝试转到flutter_hooks,但是我无法使用一些简单的textformField验证来工作。
我有2个文本字段和一个按钮,我想在某些情况下(或至少在文本字段为空时)显示错误
我的代码: -控制器:
final _emailFieldController =
useTextEditingController.fromValue(TextEditingValue.empty);
final _password =
useTextEditingController.fromValue(TextEditingValue.empty);
final _onSavePressed = useState(false);
-小部件:
TextFormField(
decoration: InputDecoration(hintText: "Your email"),
controller: _emailFieldController,
),
TextFormField(
obscureText: true,
onSaved: (newValue) => print(newValue),
validator: (value) =>
_onSavePressed.value && _password.text.isEmpty
? "Can't be empty"
: null,
decoration: InputDecoration(
hintText: "Password",
),
controller: _password,
),
RaisedButton(
child: Text("Create"),
onPressed: () {
_onSavePressed.value = true;
},
)
谢谢您的帮助!
答案 0 :(得分:1)
使用从验证者那里获得的value
。例如
validator: (value) => value.isEmpty ? "Can't be empty" : null
允许您访问密码字段的值。