【发布时间】:2022-11-14 09:43:39
【问题描述】:
我附上了一个具有底部模态表的项目。哪个表包含三个TextField 作为名称、号码和电子邮件。所以在这里我实现了 CRUD(创建、读取、更新和删除)操作,它工作正常。但在不验证TextField 的情况下,它会显示在HomePage 中。虽然如果我错过了输入姓名或号码,它仍然会将数据传递到主页卡。我尝试了许多验证选项,但没有成功。如果有人可以请帮助我。
我的代码:
import 'package:flutter/material.dart';
class HomePage extends StatefulWidget {
const HomePage({super.key});
@override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
List<Map<String, dynamic>> _contacts = [];
bool _isLoading = true;
final bool _validatename = true;
final bool _validatenumber = true;
final bool _validateemail = true;
void _refreshContacts() async {
final data = await Contact.getContacts();
setState(() {
_contacts = data;
_isLoading = false;
});
}
@override
void initState() {
super.initState();
_refreshContacts();
}
final _nameController = TextEditingController();
final _numberController = TextEditingController();
final _emailController = TextEditingController();
final bool _validate = false;
void _showForm(int? id) async {
if (id != null) {
final existingContact = _contacts.firstWhere((element) => element['id'] ==id);
_nameController.text = existingContact['name'];
_numberController.text = existingContact['number'];
_emailController.text = existingContact['email'];
}
showModalBottomSheet(context: context,
elevation: 5,
isScrollControlled: true,
builder: (_) => Container(
padding: EdgeInsets.only(top: 15, left: 15, right: 15, bottom: MediaQuery.of(context).viewInsets.bottom + 120),
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.end,
children: [
TextField(
controller: _nameController,
decoration: const InputDecoration(
hintText: "Name",
),
),
const SizedBox(
height: 10.0,
),
TextField(
keyboardType: TextInputType.number,
controller: _numberController,
decoration: const InputDecoration(
hintText: "Numbers",
),
),
const SizedBox(
height: 10.0,
),
TextField(
// keyboardType: TextInputType.emailAddress,
controller: _emailController,
decoration: const InputDecoration(
hintText: "Email Address",
),
),
const SizedBox(
height: 20.0,
),
Row(
children: [
ElevatedButton(
onPressed: () async {
if (id == null) {
await _addContact();
}
if (id != null) {
await _updateContact(id);
}
Navigator.of(context).pop();
_nameController.text = '';
_numberController.text = '';
_emailController.text = '';
},
child: Text(id == null ? 'Create New' : 'Update'),
),
const SizedBox(
width: 10.0,
),
ElevatedButton(onPressed: () async {
_nameController.text = '';
_numberController.text = '';
_emailController.text = '';
}, child: const Text("Clear")),
const SizedBox(
width: 10.0,
),
ElevatedButton(onPressed: (){
Navigator.pop(context);
}, child: const Text("Go Back")),
],
),
]),
));
}
Future<void> _addContact() async {
await Contact.createContact(
_nameController.text, _numberController.text, _emailController.text
);
_refreshContacts();
}
Future<void> _updateContact(int id) async {
await Contact.updateContact(id, _nameController.text, _numberController.text, _emailController.text );
_refreshContacts();
}
void _deleteContact(int id) async {
await Contact.deleteContact(id);
ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("Sccessfully Contact Deleted")));
_refreshContacts();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Contact App",),
backgroundColor: Colors.blueAccent,
centerTitle: true,
toolbarHeight: 80,
),
body: _isLoading ? const Center(child: CircularProgressIndicator(),) :
ListView.builder(
itemCount: _contacts.length,
itemBuilder: (context, index) =>
Card(
elevation: 5,
shape: const Border(
right: BorderSide(color: Colors.blue, width: 10.0),
),
color: Colors.orange[200],
margin: const EdgeInsets.all(15.0),
child: Material(
elevation: 20.0,
shadowColor: Colors.blueGrey,
child: ListTile(
title: Text(_contacts[index]['name'], style: const TextStyle(fontSize: 22, fontWeight: FontWeight.bold),),
subtitle: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(_contacts[index]['number'], style: const TextStyle(color: Colors.grey, fontSize: 18),),
const SizedBox(
height: 5.0,
),
Text(_contacts[index]['email'], style: const TextStyle(fontSize: 17, color: Colors.black),),
],
),
trailing: SizedBox(
width: 100,
child: Row(
children: [
IconButton(onPressed: () => _showForm(_contacts[index]['id']), icon: const Icon(Icons.edit, color: Colors.blueGrey,)),
IconButton(onPressed: () => _deleteContact(_contacts[index]['id']), icon: const Icon(Icons.delete, color: Colors.red,)),
],
),
),
),
),
),
),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.add, size: 28,),
onPressed: () => _showForm(null),
),
);
}
}
以上代码来自主页。我只需要验证部分 + 如果有人知道如何使用页面路由在另一个页面中显示每张卡片。实际上这是一个联系人应用程序。我已尝试使用新屏幕来显示全部详细信息,但无法显示。
【问题讨论】:
-
看不到
validator和表单小部件 -
在“showModalBottomSheet”方法中,用“Form”小部件包装您的列并为其提供formkey,然后用“TextFormField”小部件替换“TextField”小部件,然后为每个小部件提供验证器属性。
-
也尝试使用文本字段表单,但关键构造函数仍然没有成功。
-
如果您在底部表格中有这么大的代码/小部件,那么最好的方法是在第二个 Statefull 小部件中执行代码,然后在底部表格中调用该小部件。