【发布时间】：2018-12-05 21:32:56
【问题描述】：
我对如何在我的颤振应用中将表单上传到 Firestore 感到困惑。我已经阅读了许多教程，并且能够登录 Firebase 并将 Firestore 中的数据检索到我的颤振应用程序中，但我不知道如何将包含大量文本字段的表单上传到 Firestore。
示例：文档标题“书籍” 文本字段将包括：标题、作者等。
*** // 下面是我的页面，它确实从 Firestore 导入数据（这有效）。我添加了一个按钮，该按钮转到另一个页面，我试图在其中添加要上传到 Firestore 的表单（这不起作用）。页面加载有效，但未设置上传到 Firestore。
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'auth.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'dart:async';
class FireStore extends StatelessWidget {
FireStore({this.auth, this.onSignedOut});
final BaseAuth auth;
final VoidCallback onSignedOut;
void _signOut () async {
try {
await auth.signOut();
onSignedOut();
} catch (e) {
print (e);
}
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text ('Welcome'),
actions: <Widget>[
new FlatButton(
child: new Text('Logout', style: new TextStyle(fontSize: 17.0, color: Colors.white)),
onPressed: _signOut
)
]
),
body: new StreamBuilder(
stream: Firestore.instance.collection('books').snapshots(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) return CircularProgressIndicator();
return new GridView.count(
crossAxisCount: 2,
childAspectRatio: 1.0,
padding: const EdgeInsets.all(4.0),
mainAxisSpacing: 4.0,
crossAxisSpacing: 4.0,
children: snapshot.data.documents.map((DocumentSnapshot document) {
return new ListTile(
title: new Text(document['title']),
subtitle: new Text(document['author']),
);
}).toList(),
);
},
),
floatingActionButton: new FloatingActionButton(
elevation: 0.0,
child: new Icon(Icons.add),
backgroundColor: new Color(0xFFE57373),
onPressed: (){
Navigator.push(
context,
new MaterialPageRoute(builder: (context) => new UploadFormField()),
);
}
)
);
}
}
// UPLOAD TO FIRESTORE
class UploadFormField extends StatefulWidget {
@override
_UploadFormFieldState createState() => _UploadFormFieldState();
}
class _UploadFormFieldState extends State<UploadFormField> {
GlobalKey<FormState> _key = GlobalKey();
bool _validate = false;
String title, author;
@override
Widget build(BuildContext context) {
return MaterialApp(
home: new Scaffold(
appBar: new AppBar(
title: new Text('Upload'),
),
body: new SingleChildScrollView(
child: new Container(
margin: new EdgeInsets.all(15.0),
child: new Form(
key: _key,
autovalidate: _validate,
child: FormUI(
)),
),
),
),
);
}
Widget FormUI() {
return new Column(
children: <Widget>[
new TextFormField(
decoration: new InputDecoration(hintText: 'Title'),
validator: validateTitle,
onSaved: (String val) {
title = val;
}
),
new TextFormField(
decoration: new InputDecoration(hintText: 'Author'),
validator: validateAuthor,
onSaved: (String val) {
author = val;
}
),
new SizedBox(height: 15.0),
new RaisedButton(onPressed: _sendToServer, child: new Text('Upload'),
)
],
);
}
String validateTitle (String value) {
String pattern = r' (^[a-zA-Z ]*$)';
RegExp regExp = new RegExp(pattern);
if (value.length == 0){
return 'Title is required';
} else if (!regExp.hasMatch(value)) {
return "Title must be a-z and A-Z";
}
return null;
}
String validateAuthor (String value) {
String pattern = r' (^[a-zA-Z ]*$)';
RegExp regExp = new RegExp(pattern);
if (value.length == 0){
return 'Author is required';
} else if (!regExp.hasMatch(value)) {
return "Author must be a-z and A-Z";
}
return null;
}
_sendToServer(){
if (_key.currentState.validate() ){
//No error in validator
_key.currentState.save();
print ("Title $title");
print ("Author $author");
} else {
// validation error
setState(() {
_validate = true;
});
}
}
}
【问题讨论】：
-
发布您开始使用的代码。
-
这是当前的代码/表单（我已经简化了）。如果您向下滚动大约一半，您将看到“UploadFormField”类。这就是我假设我需要上传 FIrestore 数据的地方。
标签： forms firebase dart google-cloud-firestore flutter