dropdown_search 0.3.1

Simple and robust Searchable Dropdown with item search feature, making it possible to use an offline item list or filtering URL for easy customization.

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

• Online and offline items
• Searchable dropdown
• Three dropdown mode: Menu/ BottomSheet/ Dialog
• Material dropdown
• Easy customizable UI
• Easy implementation into statelessWidget

packages.yaml

dropdown_search: <lastest version>

Import

import 'package:dropdown_search/dropdownSearch.dart';

Simple implementation

DropdownSearch(
  items: ["Brazil", "Italia", "Tunisia", "Canada"],
  label: Country,
  onChanged: print,
  selectedItem: "Brazil",
);

customize showed field (itemAsString)

DropdownSearch<UserModel>(
  label: "Name",
  onFind: (String filter) => getData(filter),
  itemAsString: (UserModel u) => u.userAsStringByName(),
  searchBoxDecoration: InputDecoration(
    hintText: "Search",
    border: OutlineInputBorder(),
  ),
  onChanged: (UserModel data) => print(data),
),

DropdownSearch<UserModel>(
  label: "Name",
  onFind: (String filter) => getData(filter),
  itemAsString: (UserModel u) => u.userAsStringById(),
  searchBoxDecoration: InputDecoration(
    hintText: "Search",
    border: OutlineInputBorder(),
  ),
  onChanged: (UserModel data) => print(data),
),

customize Filter Function

DropdownSearch<UserModel>(
  label: "Name",
  filterFn: (user, filter) => user.userFilterByCreationDate(filter),
  onFind: (String filter) => getData(filter),
  itemAsString: (UserModel u) => u.userAsStringByName(),
  searchBoxDecoration: InputDecoration(
    hintText: "Search",
    border: OutlineInputBorder(),
  ),
  onChanged: (UserModel data) => print(data),
),

customize Search Mode

DropdownSearch<UserModel>(
  mode: Mode.BOTTOM_SHEET,
  label: "Name",
  maxHeight: 350,
  onFind: (String filter) => getData(filter),
  itemAsString: (UserModel u) => u.userAsString(),
  searchBoxDecoration: InputDecoration(
    hintText: "Search",
    border: OutlineInputBorder(),
  ),
  onChanged: (UserModel data) => print(data),
),

Validation

DropdownSearch(
  items: ["Brazil", "France", "Tunisia", "Canada"],
  label: "Country",
  onChanged: print,
  selectedItem: "Tunisia",
  validate: (String item) {
    if (item == null)
      return "Required field";
    else if (item == "Brazil")
      return "Invalid item";
    else
      return null;
  },
);

Endpoint implementation (using Dio package)

DropdownSearch<UserModel>(
  label: "Nome",
  onFind: (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);
  },
);

Layout customization

You can customize the layout of the DropdownSearch and its items. EXAMPLE

Properties	Description
label	DropDownSearch label
showSearchBox	show/hide the search box
isFilteredOnline	true if the filter on items is applied onlie (via API)
showClearButton	show/hide clear selected item
labelStyle	text style for the DropdownSearch label
items	offline items list
selectedItem	selected item
onFind	function that returns item from API
onChanged	called when a new item is selected
dropdownBuilder	to customize list of items UI
dropdownItemBuilder	to customize selected item
validate	function to apply the validation formula
searchBoxDecoration	decoration for the search box
backgroundColor	background color for the dialog/menu/bottomSheet
dialogTitle	the title for dialog/menu/bottomSheet
dialogTitleStyle	text style for the dialog title
dropdownItemBuilderHeight	the height of the selected item UI
itemAsString	customize the fields the be shown
filterFn	custom filter function
enabled	enable/disable dropdownSearch
mode	MENU / DIALOG/ BOTTOM_SHEET
maxHeight	the max height for dialog/bottomSheet/Menu
showSelectedItem	manage selected item visibility (if true, the selected item will be highlighted)
compareFn	Function(T item, T selectedItem), custom comparing function
dropdownSearchDecoration	input decoration
emptyBuilder	custom layout for empty results
loadingBuilder	custom layout for loading items
errorBuilder	custom layout for error

Attention

To use a template as an item type, and you don't want to use a custom fonction 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;
}

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