Flutter中不正确时如何验证用户名TextFormField

izj3ouym  于 2023-06-30  发布在  Flutter
关注(0)|答案(2)|浏览(139)

我正在尝试验证我的登录按钮按下的形式。当所有字段都为空时，它在客户端工作得非常好，但是对于我的switch/case，它似乎不起作用。我相信这可能与我的验证功能有关，但我无法确定它。我相信MySOAPRequest中的布尔值设置是正确的，因为当我按下登录按钮然后更新公司或PIN字段时，错误消息显示在用户名字段上，但它应该显示在登录按钮上。

带有文本字段和登录按钮的登录页面

CustomTextField(
                            key: _customTextFieldKey,
                            companyController: _companyController,
                            usernameController: _usernameController,
                            pinController: _pinController,
                          ),
                          const SizedBox(height: 20),
                          OutlinedButton(
                            onPressed: () {
                              FocusManager.instance.primaryFocus?.unfocus();
                              String lcomp = Globals().lcomp =
                                  _companyController.text.trim();
                              String luser = Globals().luser =
                                  _usernameController.text.trim();
                              String lpin =
                                  Globals().lpin = _pinController.text.trim();

                              if (lcomp.isNotEmpty &&
                                  luser.isNotEmpty &&
                                  lpin.isNotEmpty &&
                                  !_customTextFieldKey.currentState!
                                      .hasError()) {
                                MySOAPRequest(
                                  lcomp: lcomp,
                                  luser: luser,
                                  lpin: lpin,
                                  onLoginSuccess: _saveCredentials,
                                ).makeSOAPRequest(context);
                              } else {
                                _customTextFieldKey.currentState?.validate();
                              }
                            },
                            child: const Text('Login'),
                          ),

MySOAPRequest页面编码

final String lcomp;
  final String luser;
  final String lpin;
  final Function(bool) onLoginSuccess; // define the onLoginSuccess parameter

  MySOAPRequest({
    required this.lcomp,
    required this.luser,
    required this.lpin,
    required this.onLoginSuccess,
  });

switch (logonState) {
        case '1':
          // Navigate to the Landing page if the logon state is 1
          // ignore: use_build_context_synchronously
          loginFlushbar(context);
          // ignore: use_build_context_synchronously
          navigateToSubPages(context);
          onLoginSuccess(true);
          break;
        case '3':
          // ignore: use_build_context_synchronously
          flushbar(context, 'Incorrect User Name',
              'Please try again or contact your administrator if this issue persists.');
          onLoginSuccess(false);
          break;
            default:
          // ignore: use_build_context_synchronously
          flushbar(context, 'Unknown Error',
              'An unknown error occurred. Please try again or contact your administrator.');
              Globals().usernameHasError = true;
          Globals().errorText = 'Incorrect User Name';
          Globals().customTextFieldKey.currentState?.validate();
          onLoginSuccess(false);
          break;
      }

用户名字段文本

class CustomTextFieldState extends State<CustomTextField> {
  final _formKey = GlobalKey<FormState>();
  //final _usernameKey = Globals().customTextFieldKey;

  String _company = '';
  String _username = '';
  String _pin = '';

  bool _companyHasError = false;
  bool _usernameHasError = false;
  bool _pinHasError = false;

  bool hasError() {
    return _usernameHasError || _companyHasError || _pinHasError;
  }

  void validate() {
    setState(() {
      if (_formKey.currentState != null) {
        _companyHasError =
            !_formKey.currentState!.validate() || _company.isEmpty;
        _usernameHasError =
            !_formKey.currentState!.validate() || _username.isEmpty;
        _pinHasError = !_formKey.currentState!.validate() || _pin.isEmpty;
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    String lcomp = widget.companyController.text.trim();

    return Form(
      key: _formKey,
      autovalidateMode: AutovalidateMode.disabled,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisAlignment: MainAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.only(bottom: 20.0),
            //!--- COMPANY TEXT FIELD --- //

            child: TextFormField(
              controller: widget.companyController,
              decoration: InputDecoration(
                contentPadding: const EdgeInsets.only(left: 20),
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(30),
                  borderSide: const BorderSide(
                    color: Color(0xff185C91),
                  ),
                ),
                focusedBorder: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(30),
                  borderSide: const BorderSide(
                    color: ThemeClass.primaryColor,
                  ),
                ),
                enabledBorder: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(30),
                  borderSide: const BorderSide(
                    color: Color(0xff185C91),
                  ),
                ),
                errorBorder: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(30),
                  borderSide: const BorderSide(color: Colors.red),
                ),
                disabledBorder: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(30),
                  borderSide: const BorderSide(color: Color(0x00232323)),
                ),
                suffixIcon: const Icon(Icons.corporate_fare_outlined,
                    color: ThemeClass.primaryColor),
                labelText: "Company Name",
                labelStyle: const TextStyle(
                  fontSize: 14.0,
                  decoration: TextDecoration.none,
                ),
                hintText: 'Enter Company Name',
                hintStyle: const TextStyle(
                  fontSize: 14.0,
                ),
                errorText: _companyHasError
                    ? 'Please enter a valid company name!'
                    : ((_company.isNotEmpty &&
                            !Globals().resultList.contains(lcomp))
                        ? 'Please enter a valid company name!'
                        : null),
              ),
              autovalidateMode: AutovalidateMode.onUserInteraction,
              validator: (value) {
                if (value == null || value.isEmpty) {
                  return 'Please enter your company name!';
                }
                return null;
              },
              onChanged: (value) {
                setState(() {
                  _company = value;
                  _companyHasError = false;
                });
              },
              onFieldSubmitted: (value) {
                setState(() {
                  _companyHasError = !_formKey.currentState!.validate();
                });
              },
            ),
          ),
          //!--- END COMPANY TEXT FIELD --- //

          //!--- USERNAME TEXT FIELD --- //
          TextFormField(
            controller: widget.usernameController,
            //key: _usernameKey,
            decoration: InputDecoration(
              contentPadding: const EdgeInsets.only(left: 20),
              border: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(
                  color: Color(0xff185C91),
                ),
              ),
              focusedBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(
                  color: ThemeClass.primaryColor,
                ),
              ),
              enabledBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(
                  color: Color(0xff185C91),
                ),
              ),
              errorBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(color: Colors.red),
              ),
              disabledBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(color: Color(0x00232323)),
              ),
              suffixIcon: const Icon(Icons.person_outlined,
                  color: ThemeClass.primaryColor),
              labelText: "Username",
              labelStyle: const TextStyle(
                fontSize: 14.0,
                decoration: TextDecoration.none,
              ),
              hintText: 'Enter username',
              hintStyle: const TextStyle(
                fontSize: 14.0,
              ),
              errorText: _usernameHasError
                  ? 'Please enter a valid username!'
                  : Globals().usernameHasError
                      ? Globals().errorText
                      : null,
            ),
            autovalidateMode: AutovalidateMode.onUserInteraction,
            validator: (value) {
              if (value == null || value.isEmpty) {
                return 'Please enter your username!';
              }
              return null;
            },
            onChanged: (value) {
              setState(() {
                _username = value;
                _usernameHasError = false;
                Globals().usernameHasError = false;
              });
            },
            onFieldSubmitted: (value) {
              setState(() {
                _usernameHasError = !_formKey.currentState!.validate();
              });
            },
          ),
          //!--- END USERNAME TEXT FIELD --- //

          const SizedBox(height: 20),

          //!--- PIN TEXT FIELD --- //
          TextFormField(
            controller: widget.pinController,
            inputFormatters: [
              LengthLimitingTextInputFormatter(6),
              FilteringTextInputFormatter.digitsOnly
            ],
            obscureText: true,
            keyboardType: TextInputType.number,
            decoration: InputDecoration(
              contentPadding: const EdgeInsets.only(left: 20),
              border: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(
                  color: Color(0xff185C91),
                ),
              ),
              focusedBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(
                  color: ThemeClass.primaryColor,
                ),
              ),
              enabledBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(
                  color: Color(0xff185C91),
                ),
              ),
              errorBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(color: Colors.red),
              ),
              disabledBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(30),
                borderSide: const BorderSide(color: Color(0x00232323)),
              ),
              suffixIcon: const Icon(Icons.pin_outlined,
                  color: ThemeClass.primaryColor),
              labelText: "PIN",
              labelStyle: const TextStyle(
                fontSize: 14.0,
                decoration: TextDecoration.none,
              ),
              hintText: 'Enter PIN',
              hintStyle: const TextStyle(
                fontSize: 14.0,
              ),
              errorText: _pinHasError
                  ? 'Please enter a valid PIN!'
                  : _pin.length < 4 && _pin.isNotEmpty
                      ? 'PIN is too short!'
                      : null,
            ),
            autovalidateMode: AutovalidateMode.onUserInteraction,
            validator: (value) {
              if (value == null || value.isEmpty) {
                return 'Please enter your PIN!';
              }
              return null;
            },
            onChanged: (value) {
              setState(() {
                _pin = value;
                _pinHasError = false;
              });
            },
            onFieldSubmitted: (value) {
              setState(() {
                _pinHasError = !_formKey.currentState!.validate();
              });
            },
          ),
          //!--- END PIN TEXT FIELD --- //
        ],
      ),
    );
  }
}
flutter

2条答案

按热度按时间
tf7tbtn2

tf7tbtn21#

我刚看到你在开关箱上做了些坏事

ignore: use_build_context_synchronously

不应该异步调用构建上下文是有原因的，因为它可能在您传递后已被卸载。
如果您使用的是有状态小部件（看起来是这样），则可以在构建小部件外部定义上下文相关函数，如下所示

StatefulWidget{

 void _loginFlushBar() => loginFlushbar(context);
 void _navigateToSubPages => navigateToSubPages(context);


   Widget build(Buildcontext context){
      //Your widgets
   }

}
赞(0）分享  回复(0）举报  2023-06-30
jaql4c8m

jaql4c8m2#

将TextFormField Package 在Form小部件中，并向Form提供GlobalKey<FormState>作为其键。然后，您可以使用_formKey.currentState!.validate()验证它。

赞(0）分享  回复(0）举报  2023-06-30
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