Firebase数据库中来自TextFormFields的数据为null
我很难弄清楚这个问题（我还是扑朔迷离），我创建了一个新屏幕，其中的表单可以让用户用信息填充信息，并在填写信息后显示{{1 }}和validator分别位于每个 onSaved:上，我只希望文本格式字段将数据保存到Firebase数据库。
编辑：我设法使用此代码使其工作，但Ive输入的数据是Firebase数据库中的TextFormField()（第二张图片）：
nulled我也看过一些教程，但是Im与它试图做的有点不同（我想这是一个初学者的问题，Im是编程的新手，我爱上了扑朔迷离的笑声）<< / p>
现在，在Firebase控制台上，我创建了一个新集合，其中包含一些新内容 虚拟数据只是为了填写（请注意，我仍然不保存来自 该应用程序，刚刚创建了一个集合并放入了一些虚拟数据）
我的火力基地的图片如下：
child: FlatButton(
color: Colors.blue,
child: Text("Confirm", style: TextStyle(color: Colors.white)),
onPressed: () async {
await db.collection("createdoffers").add(
{
'name': offerName,
'type': offerType,
'start': start,
'end': end,
}
);
},
),
数据
我的代码在下面的屏幕表格中，我试图将输入数据保存在TextFormField中，然后通过单击NULLED
我的目标是： 1。将数据保存到firebase2。读取该数据并将其显示在Container小部件中，我现在只希望CRUD中的C和R
FlatButton我尝试过的很
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
class AddOffer extends StatefulWidget {
AddOffer({Key key}) : super(key: key);
@override
_AddOfferState createState() => _AddOfferState();
}
class _AddOfferState extends State<AddOffer> {
String offerName;
String offerType;
String start;
String end;
bool allBranches = false;
bool selectedBranches = false;
final db = Firestore.instance;
final _formKey = GlobalKey<FormState>();
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: ListView(
children: <Widget>[
Container(
color: Color(0xFF707070),
height: 200.0,
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
InkWell(
onTap: () {
setState(() {
Navigator.pop(context);
});
},
child: Padding(
padding: EdgeInsets.fromLTRB(20, 30, 20, 0),
child: Icon(Icons.arrow_back,
color: Colors.white, size: 25.0),
),
),
Center(
child: Padding(
padding: EdgeInsets.all(80.0),
child: Text(
"DEAL IMAGE",
style: TextStyle(
fontSize: 20.0,
color: Colors.white,
fontWeight: FontWeight.bold),
),
),
),
],
),
),
Form(
key: _formKey,
child: Padding(
padding: EdgeInsets.fromLTRB(30, 30, 30, 0),
child: Column(
children: <Widget>[
Row(
children: <Widget>[
Text(
"Name",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
],
),
TextFormField(
decoration: InputDecoration(hintText: 'Enter Offer Name'),
validator: (value) {
if (value.isEmpty) {
}
return 'Please Enter Offer Name';
},
onSaved: (value) => offerName = value,
),
SizedBox(height: 30.0),
Row(
children: <Widget>[
Text(
"Type",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
],
),
TextFormField(
decoration: InputDecoration(hintText: 'Enter Offer Type'),
validator: (value) {
if (value.isEmpty) {
}
return 'Please Enter Offer Type';
},
onSaved: (value) => offerType = value,
),
SizedBox(height: 60.0),
Row(
children: <Widget>[
Text(
"Start",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
],
),
TextFormField(
decoration:
InputDecoration(hintText: 'Enter Offer Start Date'),
validator: (value) {
if (value.isEmpty) {
}
return 'Please Enter Offer Start Date';
},
onSaved: (value) => offerName = value,
),
SizedBox(height: 30.0),
Row(
children: <Widget>[
Text(
"End",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
],
),
TextFormField(
decoration:
InputDecoration(hintText: 'Enter Offer End Date'),
validator: (value) {
if (value.isEmpty) {
}
return 'Please Enter Offer End Date';
},
onSaved: (value) => offerName = value,
),
SizedBox(height: 60.0),
Row(
children: <Widget>[
Column(
children: <Widget>[
Text(
"Valid Until",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
SizedBox(height: 5.0),
Text(
"01/01/20",
style: TextStyle(
color: Color(0xFF707070), fontSize: 17.0),
),
],
),
],
),
SizedBox(height: 30.0),
Row(
children: <Widget>[
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
"Time of Active",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
SizedBox(height: 5.0),
Text(
"12/12/19",
style: TextStyle(
color: Color(0xFF707070), fontSize: 17.0),
),
],
),
],
),
SizedBox(height: 60.0),
Row(
children: <Widget>[
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
"Max people (optional)",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
SizedBox(height: 5.0),
Text(
"5",
style: TextStyle(
color: Color(0xFF707070), fontSize: 17.0),
),
],
),
],
),
SizedBox(height: 20.0),
Row(
children: <Widget>[
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
"Max redemption per member (optional)",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
SizedBox(height: 5.0),
Text(
"5",
style: TextStyle(
color: Color(0xFF707070), fontSize: 17.0),
),
],
),
],
),
SizedBox(height: 20.0),
Row(
children: <Widget>[
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
"Number of redemption",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
SizedBox(height: 5.0),
Text(
"5",
style: TextStyle(
color: Color(0xFF707070), fontSize: 17.0),
),
],
),
],
),
SizedBox(height: 60.0),
Row(
children: <Widget>[
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
"Branches",
style: TextStyle(
color: Color(0xFF707070),
fontSize: 17.0,
fontWeight: FontWeight.bold),
),
SizedBox(height: 5.0),
Row(
children: <Widget>[
Checkbox(
value: allBranches,
onChanged: (bool value) {
setState(() {
allBranches = value;
});
},
),
Text(
"All Branches",
style: TextStyle(
color: Color(0xFF707070), fontSize: 17.0),
),
],
),
Row(
children: <Widget>[
Checkbox(
value: selectedBranches,
onChanged: (bool value) {
setState(() {
selectedBranches = value;
});
},
),
Text(
"Selected Branches",
style: TextStyle(
color: Color(0xFF707070), fontSize: 17.0),
),
],
),
],
),
],
),
SizedBox(height: 30.0),
Container(
width: 250.0,
child: FlatButton(
color: Colors.blue,
child: Text("Confirm", style: TextStyle(color: Colors.white)),
onPressed: () {
},
),
),
SizedBox(height: 30.0),
],
),
),
)
],
),
),
);
}
}
2 个答案:
答案 0 :(得分：1)
出了什么问题
child: FlatButton(
color: Colors.blue,
child: Text("Confirm", style: TextStyle(color: Colors.white)),
onPressed: () async {
await db.collection("createdoffers").add(
{
'name': offerName, // This is null, try to change the way you save data via setState
'type': offerType,
'start': start,
'end': end,
}
);
},
),
您可以做什么
如果您继续执行此操作，请尝试尝试TextEditingController。
// Declaration
TextEditingController _offerNameTextController = TextEditingController();
// Usage
TextFormField(
controller: _offerNameTextController,
...
)
// Retrieving data from the input field
FlatButton(
onPressed: () {
// Utilize the value (eg. on your Firebase saving method
print(_offerNameTextController.text);
}
)
进一步阅读
答案 1 :(得分：0)
您正在textformfield期间传递onsaved的值。但是您忘了保存表格。添加此_formKey.currentState.save();
child: FlatButton(
color: Colors.blue,
child: Text("Confirm", style: TextStyle(color: Colors.white)),
onPressed: () async {
_formKey.currentState.save();
await db.collection("createdoffers").add(
{
'name': offerName,
'type': offerType,
'start': start,
'end': end,
}
);
},
),
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