将数据添加到Firestore
我正在创建一个Flutter应用程序，并且正在使用Firestore作为后端。我打算通过单击按钮将数据从应用程序添加到后端。我拥有这些数据所需的变量，也称为Firestore实例。现在的问题是，当我单击“添加”按钮时，尽管这些字段是在firestore中创建的，但其值为空。我从这里已经读过其他人写的文章，但是看起来这里提供的解决方案无法解决我的问题。
我可能做错了什么？以下是我的代码摘录和我的后端快照。
class SoftwareIssuesContactForm extends StatefulWidget {
@override
_SoftwareIssuesContactFormState createState() =>
_SoftwareIssuesContactFormState();
}
class _SoftwareIssuesContactFormState extends State<SoftwareIssuesContactForm> {
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
List<String> _semesters = <String>['', 'Semester 1', 'Semester 2',
'Semester 3', 'Semester 4', 'Semester 5', 'Semester 6', 'Semester 7',
'Semester 8'];
String _stNumber;
String _stEmail;
String _query;
String _dropdownError;
String _stPhone;
String _selectedItem;
bool _autoValidate = false;
String _semester = '';
String uid;
// Contact newContact = Contact();
final FocusNode myFocusNodeEmail = FocusNode();
final FocusNode myFocusNodeName = FocusNode();
TextEditingController studentNumberController = TextEditingController();
TextEditingController studentEmailController = TextEditingController();
TextEditingController queryController = TextEditingController();
TextEditingController studentPhoneNumberController = TextEditingController();
PageController _pageController;
@override
void dispose() {
myFocusNodeEmail.dispose();
myFocusNodeName.dispose();
_pageController?.dispose();
super.dispose();
}
@override
void initState() {
super.initState();
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
_pageController = PageController();
}
// ignore: slash_for_doc_comments
/**********************************************************
######## FOR VALIDATING STUDENT NUMBER #######
*********************************************************/
String validateStudentNumber(String value){
if (value.isEmpty) {
return 'Student Number is required';
}
else {
return null;
}
}
// ignore: slash_for_doc_comments
/**********************************************************
######## FOR VALIDATING PHONE NUMBER #######
*********************************************************/
String validateStudentPhoneNumber(String value){
String pattern = r'(^(?:[+0]9)?[0-9]{10,12}$)';
RegExp regExp = RegExp(pattern);
if (value == null) return 'Phone Number is required';
// else if (value.length != 10) {
// return 'Phone Number must be of 10 digits';
// }
else if (!regExp.hasMatch(value)) {
return 'Enter a valid Phone Number';
}
return null;
}
// ignore: slash_for_doc_comments
/**********************************************************
######## FOR VALIDATING EMAIL ADDRESS #######
*********************************************************/
String validateStudentEmailAddress (String value){
Pattern pattern =
r'^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}'
r'\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$';
RegExp regex = RegExp(pattern);
if (value.isEmpty) return 'Your Email Address is required';
if (!regex.hasMatch(value))
return 'Enter a valid Email Address';
else
return null;
}
// ignore: slash_for_doc_comments
/**********************************************************
######## FOR VALIDATING ENQUIRIES #######
*********************************************************/
String validateStudentQuery(String value){
if (value.isEmpty) {
return 'You forgot to state the problem...';
}
else {
return null;
}
}
// ignore: slash_for_doc_comments
/*******************************************************************
##### CHECKING IF FORM IS VALID BEFORE SUBMITTING ######
*******************************************************************/
bool validateAndSave(){
final form = _formKey.currentState;
if(form.validate()){
form.save();
return true;
}
else {
return false;
}
}
// ignore: slash_for_doc_comments
/**********************************************************
####### VALIDATING FORM BEFORE SUBMITTING ########
***********************************************************/
validateAndSubmit(){
if (validateAndSave()) {
try{
// Navigator.pushReplacement(context,
// MaterialPageRoute(builder: (context) => DashboardScreen()),
// );
/**********************************************************
####### SHOW DIALOG ON SUBMIT ########
***********************************************************/
return showDialog(
barrierDismissible: false,
context: context,
builder: (BuildContext context){
return Dialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(50),
),
elevation: 6,
backgroundColor: Colors.transparent,
child: _buildDialogContent(context),
);
}
);
}
catch(e){
print(e);
}
}
else {
setState(() {
_autoValidate = true;
});
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color(0xFF56ccf2),
// backgroundColor: Colors.grey[100],
body: SafeArea(
top: false,
bottom: false,
child: SingleChildScrollView(
child: Container(
// height: 600,
child: Column(
children: [
Padding(
padding: EdgeInsets.only(top: 30,),
child: Text(
"IT SUPPORT QUERY FORM",
style: TextStyle(
color: Colors.white,
fontSize: 20,
fontWeight: FontWeight.bold,
// fontStyle: FontStyle.italic,
),
),
),
Padding(
padding: EdgeInsets.only(
top: 10.0, bottom: 5.0, left: 15.0, right: 15.0),
child: Card(
elevation: 6,
child: Form(
key: _formKey,
autovalidate: _autoValidate,
child: ListView(
shrinkWrap: true, // use this
padding: EdgeInsets.symmetric(horizontal: 20.0),
children: <Widget>[
//===> Email Number Text Input starts from here <===
Padding(
padding: EdgeInsets.only(
top: 10.0, bottom: 6.0, left: 1.0, right: 1.0),
child: TextFormField(
autofocus: false,
focusNode: myFocusNodeEmail,
controller: studentNumberController,
keyboardType: TextInputType.emailAddress,
style: TextStyle(
fontSize: 16.0,
color: Colors.black),
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(10.0),
),
// icon: Icon(Icons.person),
// hintText: 'Enter your first and last name',
labelText: 'Student Number',
),
validator: validateStudentNumber,
onSaved: (String val) {
_stNumber = val;
},
),
),
// Padding(
// padding: EdgeInsets.only(
// top: 5.0, bottom: 10.0, left: 1.0, right: 1.0),
// child: TextFormField(
// decoration: InputDecoration(
// border: OutlineInputBorder(
// borderRadius: BorderRadius.circular(20.0),
// ),
// // icon: const Icon(Icons.phone),
// // hintText: 'Enter a phone number',
// labelText: 'Phone',
// ),
// keyboardType: TextInputType.phone,
// inputFormatters: [
// WhitelistingTextInputFormatter.digitsOnly,
// ],
// ),
// ),
//===> Email Address Text Input starts from here <===
Padding(
padding: EdgeInsets.only(
top: 1.0, bottom: 6.0, left: 1.0, right: 1.0),
child: TextFormField(
validator: validateStudentEmailAddress,
onSaved: (String val) {
_stEmail = val;
},
controller: studentEmailController,
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(10.0),
),
// icon: const Icon(Icons.email),
// hintText: 'Enter a email address',
labelText: 'Student Email',
),
keyboardType: TextInputType.emailAddress,
style: TextStyle(
fontSize: 16.0,
color: Colors.black),
),
),
//===> Phone Number Text Input starts from here <===
Padding(
padding: EdgeInsets.only(
top: 1.0, bottom: 6.0, left: 1.0, right: 1.0),
child: TextFormField(
validator: validateStudentPhoneNumber,
onSaved: (String val) {
_stPhone = val;
},
controller: studentPhoneNumberController,
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(10.0),
),
// icon: const Icon(Icons.email),
// hintText: 'Enter a email address',
labelText: 'Phone Number',
),
keyboardType: TextInputType.phone,
inputFormatters: [
FilteringTextInputFormatter.allow(
RegExp(r'^[()\d -]{1,15}$')),
],
style: TextStyle(
fontSize: 16.0,
color: Colors.black),
),
),
//===> Drop Down Menu starts from here <===
Padding(
padding: EdgeInsets.only(top: 1.0, bottom: 6.0, left: 1.0, right: 1.0),
child: FormField(
builder: (FormFieldState state) {
return InputDecorator(
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(10.0),
),
// icon: const Icon(Icons.color_lens),
labelText: 'Semester',
hintText: ("Semester"),
),
isEmpty: _semester == '',
child: Padding(
padding: EdgeInsets.only(left: 1.0, right: 130 , ),
child: Container(
// height: 55, //gives the height of the dropdown button
width: MediaQuery.of(context).size.width,
child: DropdownButtonHideUnderline( // to hide the default underline of the dropdown button
child: ButtonTheme(
alignedDropdown: true, //If false (the default), then the dropdown's menu will be wider than its button.
child: DropdownButton(
value: _semester,
isDense: true,
elevation: 5,
isExpanded: true,
onChanged: (String value) {
setState(() {
_semester = value; // saving the selected value
state.didChange(value);
});
},
items: _semesters.map((String value) {
return DropdownMenuItem(
value: value, // displaying the selected value
child: Text(value ?? '',
textAlign: TextAlign.left,
overflow: TextOverflow.ellipsis,
maxLines: 1,
softWrap: true,
),
);
}).toList(),
),
),
),
),
),
);
},
),
),
//===> Query Text Input starts from here <===
TextFormField(
validator: validateStudentQuery,
onSaved: (String val) {
_query = val;
},
controller: queryController,
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(10.0),
),
// icon: const Icon(Icons.email),
// hintText: 'Enter your query',
labelText: 'Your Query',
),
keyboardType: TextInputType.text,
style: TextStyle(
fontSize: 16.0,
color: Colors.black),
maxLines: 3,
),
// ignore: slash_for_doc_comments
/**********************************************************
####### FOR SUBMIT BUTTON ########
***********************************************************/
Container(
// padding: EdgeInsets.only(left: 1.0, top: 10.0),
margin: EdgeInsets.only(top: 6.0, bottom: 5),
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
boxShadow: <BoxShadow>[
BoxShadow(
color: Color(0xFF008ECC),
offset: Offset(0.0, 0.0),
//blurRadius: 20.0,
),
BoxShadow(
color: Color(0xFF008ECC),
offset: Offset(0.0, 0.0),
//blurRadius: 20.0,
),
],
gradient: LinearGradient(
colors: [
Color(0xFF008ECC), //Colors is Olympic blue
Color(0xFF008ECC),
],
begin: FractionalOffset(0.2, 0.2),
end: FractionalOffset(1.0, 1.0),
stops: [0.0, 1.0],
tileMode: TileMode.clamp),
),
child: MaterialButton(
onPressed: validateAndSubmit,
child: Padding(
padding: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 65.0),
child: Text(
"Submit",
style: TextStyle(
color: Colors.white,
fontSize: 25.0,
),
),
),
)),
],
)),
),
),
],
),
),
)),
);
}
}
// ignore: slash_for_doc_comments
/**********************************************************
### IMPLEMENTATION OF _buildDialogContent METHOD ###
***********************************************************/
Widget _buildDialogContent(BuildContext context) => Container(
height: 230,
decoration: BoxDecoration(
color: Color(0xFF008ECC),
shape: BoxShape.rectangle,
borderRadius: BorderRadius.all(Radius.circular(12)),
),
child: Column(
children: <Widget>[
Container(
child: Padding(
padding: EdgeInsets.all(12.0),
child: Container(
height: 80, width: 80,
child: Icon(MdiIcons.vote,
size: 90,
color: Color(0xFF56ccf2),
),
),
),
width: double.infinity,
decoration: BoxDecoration(
color: Colors.white,
shape: BoxShape.rectangle,
borderRadius: BorderRadius.only(topLeft: Radius.circular(12),
topRight: Radius.circular(12)),
),
),
SizedBox(height: 24),
Padding(
padding: EdgeInsets.only(left: 5, right: 5),
child: Text("To submit the form tap Yes. tap No to edit the form".toUpperCase(),
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.white,
fontSize: 17,
),
),
),
SizedBox(height: 10),
Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text("No".toUpperCase(),
style: TextStyle(
color: Colors.white,
),
),
),
SizedBox(width: 8),
Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(10.0)),
boxShadow: <BoxShadow>[
BoxShadow(
color: Color(0xFF008ECC),
offset: Offset(0.0, 0.0),
//blurRadius: 20.0,
),
BoxShadow(
color: Color(0xFF008ECC),
offset: Offset(0.0, 0.0),
//blurRadius: 20.0,
),
],
gradient: LinearGradient(
colors: [
Color(0xFF008ECC), //Colors is Olympic blue
Color(0xFF008ECC),
],
begin: FractionalOffset(0.2, 0.2),
end: FractionalOffset(1.0, 1.0),
stops: [0.0, 1.0],
tileMode: TileMode.clamp),
),
child: RaisedButton(
onPressed: () {
_saveInput();
// Navigator.of(context).pop();
Navigator.pushReplacement(context,
MaterialPageRoute(builder: (context) => DashboardScreen()),
);
},
color: Colors.white,
child: Text("Yes".toUpperCase(),
style: TextStyle(
color: Colors.redAccent,
),
),
),
),
],
),
],
),
);
//This function adds the needed data to firestore.
void _saveInput () async{
String uid;
String _stName;
String _stSemester;
String _stNumber;
String _stEmail;
String _query;
String _stPhone;
String _selectedItem;
//Creating reference object for firestore
final db = FirebaseFirestore.instance;
print(_stName);
await FirebaseFirestore.instance.collection('software_issues').doc().set({
'Uid': uid,
'Student Name': _stName,
'Student Semester': _stSemester,
'Student Number': _stNumber,
'Student Email': _stEmail,
'Student Query': _query,
'Student Phone Num': _stPhone,
'Selected Item': _selectedItem,
});
1 个答案:
答案 0 :(得分：1)
您可以尝试：
{{1}}
如果要更新合并属性，请将其设置为true。
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