Flutter text form field validation

Question

Hello I am creating a mobile number verification screen. In this I want to validate the Indian mobile number. But my code is not validating and I am not able to understand where the problem is. If the text form field is validated, then the api is called and if the text form field is not validated then the text form field is highlighted with alert. Please help me in resolving this issue.

Form(
        key: _formKeymobile,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Text(
              S.of(context).verify,
              style: TextStyle(
                  fontSize: 30.0.sp,
                  fontFamily: 'DancingScript',
                  color: Colors.purple),
            ),
            SizedBox(
              height: 20,
            ),
            TextFormField(
              style: TextStyle(color: Colors.blue, fontSize: 20.0.sp),
              controller: _mobilenumber,
              validator: (value) {
                const pattern =
                    r'(^(?:(?:\+|0{0,2})91(\s*[\ -]\s*)?|[0]?)?[6789]\d{9}|(\d[ -]?){10}\d$)';
                final regExp = RegExp(pattern);
                if (value!.isEmpty) {
                  return S.of(context).EnterSomeText;
                } else if (value.length != 10) {
                } else if (!regExp.hasMatch(value)) {
                  return S.of(context).Mobilenumbermust10digits;
                  return S.of(context).MobileNumbermustbedigits;
                }
              },
              maxLength: 11,
              keyboardType: TextInputType.phone,
              decoration: InputDecoration(
                  hintText: S.of(context).mobile,
                  border: OutlineInputBorder()),
            ),
            SizedBox(
              height: 8.0,
            ),
            Row(
              children: [
                Checkbox(
                  checkColor: Colors.white,
                  value: isChecked,
                  onChanged: (bool? value) {
                    setState(() {
                      isChecked = value!;
                    });
                    // print(isChecked);
                  },
                ),
                SizedBox(
                  width: MediaQuery.of(context).size.width * 0.60,
                  child: Column(
                    children: [
                      Text(S.of(context).tcone),
                      InkWell(
                          onTap: () {
                            openWebsite(
                                
                                context);
                          },
                          child: Text(
                            S.of(context).tctwo,
                            style: TextStyle(color: Colors.blue),
                          )),
                      Text("and"),
                      InkWell(
                          onTap: () {
                            openWebsite(
                                
                                context);
                          },
                          child: Text(
                            S.of(context).tcthree,
                            style: TextStyle(color: Colors.blue),
                          )),
                    ],
                  ),
                )
              ],
            ),
            ElevatedButton(
              onPressed: () async {
                if (isChecked == true) {
                  if (_formKeymobile.currentState!.validate() &&
                      isChecked == true) {
                    String? deviceId = await _getId();
                    if (deviceId != null) {
                      print("api called");
                    } else {
                      EasyLoading.showError("Unable to get device id");
                    }
                  }
                } else {
                  EasyLoading.showError("Please click the box");
                }
              },
              style: ButtonStyle(
                  backgroundColor:
                      MaterialStateProperty.all(Colors.purple)),
              child: Text(S.of(context).otp),
            ),
            SizedBox(
              height: 8.0,
            ),
            ElevatedButton(
              onPressed: () async {
                if (_formKeymobile.currentState!.validate() &&
                    isChecked == true) {
                  print("form validated");
                }
              },
              style: ButtonStyle(
                  backgroundColor: MaterialStateProperty.all(Colors.green)),
              child: Text("Already have OTP"),
            ),
          ],
        )

eamirho3ein · Accepted Answer · 2022-09-04 06:52:35Z

1

try this:

validator: (value) {
                const pattern =
                    r'(^(?:(?:\+|0{0,2})91(\s*[\ -]\s*)?|[0]?)?[6789]\d{9}|(\d[ -]?){10}\d$)';
                final regExp = RegExp(pattern);
                if (value == null || value!.isEmpty) {
                  return S.of(context).EnterSomeText;
                } else if (value.length != 10) {
                } else if (!regExp.hasMatch(value)) {
                  return S.of(context).Mobilenumbermust10digits;
                  return S.of(context).MobileNumbermustbedigits;
                }
              },

and also change this:

onPressed: () async {
                if (_formKeymobile.currentState!.validate() &&
                      isChecked == true) {
                    String? deviceId = await _getId();
                    if (deviceId != null) {
                      print("api called");
                    } else {
                      EasyLoading.showError("Unable to get device id");
                    }
                  } else {
                  EasyLoading.showError("Please click the box");
                }
              },

edited Sep 4, 2022 at 6:52

answered Sep 4, 2022 at 6:43

eamirho3ein

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1 Comment

eamirho3ein Over a year ago

glad to hear that, If it was useful to you please approve and up vote it so other people find it easier.

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