使用 DataTable Flutter 的搜索栏布局
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【中文标题】使用 DataTable Flutter 的搜索栏布局【英文标题】:Search Bar Layout with DataTable Flutter 【发布时间】:2021-05-28 18:44:14 【问题描述】:我为我的DataTable
列表创建了一个简单的搜索栏,但问题是我不能只返回我搜索的项目,而是得到空字段和我搜索的项目。我尝试了各种方法,但我得到的错误是我需要行和列一样多,所以这是目前我让它工作的唯一方法。
但我想让它变成这样:
代码如下:
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'models/vehicle.dart';
import 'services/vehicle_api.dart';
import 'models/vehicle_data_provider.dart';
class VehicleList extends StatefulWidget
@override
_VehicleList createState() => _VehicleList();
class _VehicleList extends State<VehicleList>
TextEditingController controller = TextEditingController();
String _searchResult = '';
_getPosts() async
HomePageProvider provider =
Provider.of<HomePageProvider>(context, listen: false);
var postsResponse = await fetchVehicles();
if (postsResponse.isSuccessful)
provider.setPostsList(postsResponse.data, notify: false);
else
provider.mergePostsList(
postsResponse.data,
);
provider.setIsHomePageProcessing(false);
@override
void initState()
_getPosts();
super.initState();
@override
Widget build(BuildContext context)
return Column(
children: [
Card(
child: new ListTile(
leading: new Icon(Icons.search),
title: new TextField(
controller: controller,
decoration: new InputDecoration(
hintText: 'Search', border: InputBorder.none),
onChanged: (value)
setState(()
_searchResult = value;
);
),
trailing: new IconButton(
icon: new Icon(Icons.cancel),
onPressed: ()
setState(()
controller.clear();
_searchResult = '';
);
,
),
),
),
Consumer<HomePageProvider>(
builder: (context, vehicleData, child)
return Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Container(
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(
Radius.circular(12.0),
),
),
child: SingleChildScrollView(
child: DataTable(
columnSpacing: 30,
columns: <DataColumn>[
DataColumn(
numeric: false,
label: Text(
'Friendly Name',
style: TextStyle(fontStyle: FontStyle.italic),
),
),
DataColumn(
label: Text(
'Licence Plate',
style: TextStyle(fontStyle: FontStyle.italic),
),
),
DataColumn(
label: Text(
'Delete',
style: TextStyle(fontStyle: FontStyle.italic),
),
),
],
rows: List.generate(
vehicleData.postsList.length,
(index)
VehicleData post = vehicleData.getPostByIndex(index);
return post.licencePlate
.toLowerCase()
.contains(_searchResult) ||
'$post.model'
.toLowerCase()
.contains(_searchResult) ||
'$post.make'
.toLowerCase()
.contains(_searchResult) ||
post.type
.toLowerCase()
.contains(_searchResult)
? DataRow(
cells: <DataCell>[
DataCell(
Text('$post.friendlyName'),
),
DataCell(
Text('$post.licencePlate'),
),
DataCell(
IconButton(
icon: Icon(Icons.delete),
onPressed: ()
vehicleData.deletePost(post);
,
),
),
],
)
: DataRow(
/// This is the part where I return empty rows with one row with the search bar results, so I assume this must me changed
cells: <DataCell>[
DataCell(Text('')),
DataCell(Text('')),
DataCell(Text('')),
],
);
,
),
),
),
),
],
);
,
),
],
);
似乎无法弄清楚这一点。提前感谢您的帮助!
【问题讨论】:
【参考方案1】:好的,在你发表评论后,我终于让它像我认为你想要的那样工作。这个想法是使用两个列表而不是一个列表,并且由于该空行而不使用 List.generate
方法。当您更改 _searchResult
值时,您会使用来自 users
列表的原始值过滤 userFiltered
列表。
我在 DataTable 中使用了 Flutter 示例并进行了这些编辑,它可以正常工作:
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
/// This is the main application widget.
class MyApp extends StatelessWidget
const MyApp(Key key) : super(key: key);
static const String _title = 'Flutter Code Sample';
@override
Widget build(BuildContext context)
return MaterialApp(
title: _title,
home: Scaffold(
appBar: AppBar(title: const Text(_title)),
body: MyStatelessWidget(),
),
);
class User
String name;
int age;
String role;
User(this.name, this.age, this.role);
/// This is the stateless widget that the main application instantiates.
class MyStatelessWidget extends StatefulWidget
MyStatelessWidget(Key key) : super(key: key);
@override
_MyStatelessWidgetState createState() => _MyStatelessWidgetState();
class _MyStatelessWidgetState extends State<MyStatelessWidget>
List<User> users = [User(name: "Sarah", age: 19, role: "Student"), User(name: "Janine", age: 43, role: "Professor")];
List<User> usersFiltered = [];
TextEditingController controller = TextEditingController();
String _searchResult = '';
@override
void initState()
super.initState();
usersFiltered = users;
@override
Widget build(BuildContext context)
return Column(
children: [
Card(
child: new ListTile(
leading: new Icon(Icons.search),
title: new TextField(
controller: controller,
decoration: new InputDecoration(
hintText: 'Search', border: InputBorder.none),
onChanged: (value)
setState(()
_searchResult = value;
usersFiltered = users.where((user) => user.name.contains(_searchResult) || user.role.contains(_searchResult)).toList();
);
),
trailing: new IconButton(
icon: new Icon(Icons.cancel),
onPressed: ()
setState(()
controller.clear();
_searchResult = '';
usersFiltered = users;
);
,
),
),
),
DataTable(
columns: const <DataColumn>[
DataColumn(
label: Text(
'Name',
style: TextStyle(fontStyle: FontStyle.italic),
),
),
DataColumn(
label: Text(
'Age',
style: TextStyle(fontStyle: FontStyle.italic),
),
),
DataColumn(
label: Text(
'Role',
style: TextStyle(fontStyle: FontStyle.italic),
),
),
],
rows: List.generate(usersFiltered.length, (index) =>
DataRow(
cells: <DataCell>[
DataCell(Text(usersFiltered[index].name)),
DataCell(Text(usersFiltered[index].age.toString())),
DataCell(Text(usersFiltered[index].role)),
],
),
),
),
],
);
旧帖:
我正在寻找一种过滤数据表的方法,您的问题解决了我的问题,谢谢(我现在会尽力帮助您!)。通过使用 PaginatedDataTable 小部件而不是 DataTable 我可以实现您想要的结果。这个想法是在将列表传递给源属性之前对其进行过滤。这是我用来过滤列表的代码的一部分。在 switch 块内我过滤它以删除其他元素:
switch(filter)
case "Id d'expédition":
expeditionsList = expeditionsList.where((e) => e.expeditionId.toLowerCase() == stringToSearch.toLowerCase()).toList();
break;
return PaginatedDataTable(
showCheckboxColumn: false,
rowsPerPage: 5,
source: DataTableSourceExpedition(
expeditions: expeditionsList,
onRowClicked: (index) async
await ExpeditionRowDialog.buildExpeditionRowDialog(
context, expeditionsList[index].expeditionsDetails)
.show();
,
header: Container(
width: 100,
child: Text("Expéditions"),
),
columns: [
DataColumn(
label: Text("Id d'expédition"), numeric: false, tooltip: "id"),
],
);
然后我需要使用需要 DataTableSource 对象的源属性将数据传递给表。我创建了一个扩展 DataTableSource 的单独类。我将过滤后的列表作为此类的参数传递,并覆盖 DataTableSource 类的方法:
class DataTableSourceExpedition extends DataTableSource
List<Expedition> expeditions = List();
Function onRowClicked;
Function onDeleteIconClick;
final df = DateFormat('dd.MM.yyyy');
DataTableSourceExpedition(this.expeditions, this.onRowClicked,
this.onDeleteIconClick);
DataRow getRow(int index)
final _expedition = expeditions[index];
return DataRow.byIndex(
index: index,
cells: <DataCell>[
DataCell(Text("$_expedition.expeditionId")),
DataCell(IconButton(
icon: Icon(Icons.delete_forever, color: kReturnColor,),
onPressed: ()onDeleteIconClick(index);,
))
],
onSelectChanged: (b) => onRowClicked(index));
bool get isRowCountApproximate => false;
int get rowCount => expeditions.length;
int get selectedRowCount => 0;
像这样,我可以在不需要添加空行的情况下过滤唯一的项目,如下图所示:
如果列表为空,它也可以工作。
【讨论】:
在这种情况下我需要使用DataTable
,我不确定如何传递源代码。并且不知道如何将搜索查询传递回表格,以便它只显示想要的项目..
拯救了我的一天!完美而简单的数据表搜索解决方案。以上是关于使用 DataTable Flutter 的搜索栏布局的主要内容,如果未能解决你的问题,请参考以下文章
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