Filter in Flutter (Dart) - flutter

Question

I want to search list item.
for example, Item name is "Iphone 7 Plus"
when i type iphone plus it shows empty Result but when i type iphone 7 it gives me that item. Can anyone help me how i get result on iphone plus
I am using this method:
List _getSuggestions(String query) {
List matches = [];
matches.addAll(searchItemList);
matches.retainWhere((s) =>
s.ItemName!.toLowerCase().contains(query.toLowerCase()) ||
s.ItemCode!.toLowerCase().contains(query.toLowerCase()));
return matches;
}

Answer 1

You have to split your query string to do want you want.
Check this code :
void main(List<String> args) {
final data = 'iPhone 7 plus';
var search = 'iphone plus 7';
var match = true;
for (var element in search.split(' ')) {
match = match && data.toLowerCase().contains(element.toLowerCase());
}
print('match = $match');
}

Answer 2

The logic will be
List<Item> _getSuggestions(String query) {
matches.clear();
matches = searchItemList.where((e) {
return e.code.toLowerCase().contains(query.toLowerCase()) ||
e.name.toLowerCase().contains(query.toLowerCase());
}).toList();
return matches;
}
And show all item on empty list
onChanged: (value) {
final resultSet = _getSuggestions(value);
matches = resultSet.isEmpty ? searchItemList : resultSet;
setState(() {});
},
Play with the widget.
class TestA extends StatefulWidget {
const TestA({Key? key}) : super(key: key);
#override
State<TestA> createState() => _TestAState();
}
class Item {
final String name;
final String code;
Item({
required this.name,
required this.code,
});
}
class _TestAState extends State<TestA> {
final List<Item> searchItemList =
List.generate(44, (index) => Item(name: "$index", code: "code $index"));
List<Item> matches = [];
List<Item> _getSuggestions(String query) {
matches.clear();
matches = searchItemList.where((e) {
return e.code.toLowerCase().contains(query.toLowerCase()) ||
e.name.toLowerCase().contains(query.toLowerCase());
}).toList();
return matches;
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: [
TextField(
onChanged: (value) {
final resultSet = _getSuggestions(value);
matches = resultSet.isEmpty ? searchItemList : resultSet;
setState(() {});
},
),
Expanded(
child: ListView.builder(
itemCount: matches.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(matches[index].name),
);
},
))
],
),
);
}
}