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Description:

dropdown search

Flutter DropdownSearch

Flutter simple and robust DropdownSearch with item search feature, making it possible to use an offline item list or filtering URL for easy customization.

Key Features •
Examples •
License

Key Features #

Sync and/or Async items (online, offline, DB, ...)
Searchable dropdown
Three dropdown mode: Menu/ BottomSheet/ ModalBottomSheet / Dialog
Single & multi selection
Material dropdown
Easy customizable UI
Handle Light and Dark theme
Easy implementation into statelessWidget
Support multi level items

packages.yaml #
dropdown_search: <lastest version>
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Import #
import 'package:dropdown_search/dropdown_search.dart';
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Simple implementation #
DropdownSearch<String>(
popupProps: PopupProps.menu(
showSelectedItems: true,
disabledItemFn: (String s) => s.startsWith('I'),
),
items: ["Brazil", "Italia (Disabled)", "Tunisia", 'Canada'],
dropdownDecoratorProps: DropDownDecoratorProps(
dropdownSearchDecoration: InputDecoration(
labelText: "Menu mode",
hintText: "country in menu mode",
),
),
onChanged: print,
selectedItem: "Brazil",
)

DropdownSearch<String>.multiSelection(
items: ["Brazil", "Italia (Disabled)", "Tunisia", 'Canada'],
popupProps: PopupPropsMultiSelection.menu(
showSelectedItems: true,
disabledItemFn: (String s) => s.startsWith('I'),
),
onChanged: print,
selectedItems: ["Brazil"],
)
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customize showed field (itemAsString) #
DropdownSearch<UserModel>(
asyncItems: (String filter) => getData(filter),
itemAsString: (UserModel u) => u.userAsStringByName(),
onChanged: (UserModel? data) => print(data),
dropdownDecoratorProps: DropDownDecoratorProps(
dropdownSearchDecoration: InputDecoration(labelText: "User by name"),
),
)

DropdownSearch<UserModel>(
asyncItems: (String filter) => getData(filter),
itemAsString: (UserModel u) => u.userAsStringById(),
onChanged: (UserModel? data) => print(data),
dropdownDecoratorProps: DropDownDecoratorProps(
dropdownSearchDecoration: InputDecoration(labelText: "User by id"),
),
)
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customize Filter Function #
DropdownSearch<UserModel>(
filterFn: (user, filter) =>
user.userFilterByCreationDate(filter),
asyncItems: (String filter) => getData(filter),
itemAsString: (UserModel u) => u.userAsStringByName(),
onChanged: (UserModel? data) => print(data),
dropdownDecoratorProps: DropDownDecoratorProps(
dropdownSearchDecoration: InputDecoration(labelText: "Name"),
),
)
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customize Search Mode #
DropdownSearch<UserModel>(
popupProps: PopupProps.bottomSheet(),
dropdownSearchDecoration: InputDecoration(labelText: "Name"),
asyncItems: (String filter) => getData(filter),
itemAsString: (UserModel u) => u.userAsString(),
onChanged: (UserModel? data) => print(data),
)
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Validation #
DropdownSearch(
items: ["Brazil", "France", "Tunisia", "Canada"],
dropdownSearchDecoration: InputDecoration(labelText: "Name"),
onChanged: print,
selectedItem: "Tunisia",
validator: (String? item) {
if (item == null)
return "Required field";
else if (item == "Brazil")
return "Invalid item";
else
return null;
},
)
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Endpoint implementation (using Dio package) #
DropdownSearch<UserModel>(
dropdownSearchDecoration: InputDecoration(labelText: "Name"),
asyncItems: (String filter) async {
var response = await Dio().get(
"http://5d85ccfb1e61af001471bf60.mockapi.io/user",
queryParameters: {"filter": filter},
);
var models = UserModel.fromJsonList(response.data);
return models;
},
onChanged: (UserModel? data) {
print(data);
},
)
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Layout customization #
You can customize the layout of the DropdownSearch and its items. EXAMPLE
Full documentation here
Attention #
To use a template as an item type, and you don't want to use a custom function itemAsString and compareFn you need to implement toString, equals and hashcode, as shown below:
class UserModel {
final String id;
final DateTime createdAt;
final String name;
final String avatar;

UserModel({this.id, this.createdAt, this.name, this.avatar});

factory UserModel.fromJson(Map<String, dynamic> json) {
if (json == null) return null;
return UserModel(
id: json["id"],
createdAt:
json["createdAt"] == null ? null : DateTime.parse(json["createdAt"]),
name: json["name"],
avatar: json["avatar"],
);
}

static List<UserModel> fromJsonList(List list) {
if (list == null) return null;
return list.map((item) => UserModel.fromJson(item)).toList();
}

///this method will prevent the override of toString
String userAsString() {
return '#${this.id} ${this.name}';
}

///this method will prevent the override of toString
bool userFilterByCreationDate(String filter) {
return this.createdAt.toString().contains(filter);
}

///custom comparing function to check if two users are equal
bool isEqual(UserModel model) {
return this.id == model.id;
}

@override
String toString() => name;
}
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View more Examples #
Support #
If this plugin was useful to you, helped you to deliver your app, saved you a lot of time, or you just want to support the project, I would be very grateful if you buy me a cup of coffee.

License #
MIT