[英]Flutter i want to display the data after searching
listview美好的一天,您是否知道如何制作一個搜索欄,當沒有人搜索我的數據來自 mysql 時,該搜索欄不首先顯示列表視圖 抱歉,新的 flutter
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('New Transaction'),
backgroundColor: Color(0xff083663),
),
body: RefreshIndicator(
onRefresh: fetchNotes,
key: _refresh,
child: loading
? Center(
child: CircularProgressIndicator(),
)
: ListView.builder(
itemBuilder: (context, i) {
return i == 0 ? _searchBar() : _listItem(i - 1);
},
itemCount: _notesForDisplay.length + 1,
),
));
}
這是我的搜索欄,用戶將在其中輸入他/她的搜索
_searchBar() {
return Container(
padding: const EdgeInsets.all(10.0),
child: Card(
child: ListTile(
leading: Icon(Icons.search),
title: TextField(
decoration:
InputDecoration(hintText: "Search", border: InputBorder.none),
onChanged: (text) {
text = text.toLowerCase();
setState(() {
_notesForDisplay = _notes.where((note) {
var noTitle = note.vesselname.toLowerCase();
return noTitle.contains(text);
}).toList();
});
},
),
),
),
);
}
_listItem(i) {
final x = _notesForDisplay[i];
return Container(
padding: EdgeInsets.all(20.0),
child: Row(
children: <Widget>[
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
'Vessel Name:\t' + x.vesselname,
style: TextStyle(fontSize: 18.0, fontWeight: FontWeight.bold),
),
Text('Voyage #:\t' + x.voyageno,
style: TextStyle(fontSize: 18.0)),
Text('Ship Call #:\t' + x.scn,
style: TextStyle(fontSize: 18.0)),
Divider()
],
),
),
IconButton(
icon: Icon(
Icons.add_circle_outline,
size: 30.0,
),
onPressed: () {
Navigator.of(context).push(
MaterialPageRoute(builder: (context) => Transaction(x)));
}),
],
),
);
}
}
定義一個bool
變量,指示列表視圖的可見性狀態:
bool _isListViewVisible = false;
將其添加到setState
代碼塊中:
setState(() {
_isListViewVisible = true; //Or you can check the text length
_notesForDisplay = _notes.where((note) {
var noTitle = note.vesselname.toLowerCase();
return noTitle.contains(text);
}).toList();
});
然后將列表放在可見性小部件中:
return Visibility(
visible: _isListViewVisible,
child: Container(
padding: EdgeInsets.all(20.0),
child: Row(
children: <Widget>[
....
],
),
));
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