dropdown_search 0.1.6
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Simple and robust Searchable Dropdown with item search feature, making it possible to use an offline item list or filtering URL for easy customization.

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DropdownSearch package #

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

ATTENTION #

If you use rxdart in your project in a version lower than 0.23.x, use version 0.1.7+1 of this package. Otherwise, you can use the most current version!

packages.yaml #

searchable_dropdown: <lastest version>

Import #

import 'package:searchable_dropdown/searchableDropdown.dart';

Simple implementation #

DropdownSearch(
  items: ["Brasil", "Itália", "Estados Undos", "Canadá"],
  label: "País",
  onChanged: print,
  selectedItem: "Brasil",
);

customize showed field (itemAsString) #

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

DropdownSearch<UserModel>(
  label: "Nome",
  onFind: (String filter) => getData(filter),
  itemAsString: UserModel.userAsStringById,
  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

To customize the DropdownSearch, we have the dropdownBuilder property, which takes a function with the parameters:

  • BuildContext context: current context;
  • T item: Current item, where T is the type passed in the DropdownSearch constructor.

To customize the items, we have the dropdownItemBuilder property, which takes a function with the parameters:

  • BuildContext context: current context;
  • T item: Current item, where T is the type passed in the DropdownSearch constructor.
  • bool isSelected: Boolean that tells you if the current item is selected.

Attention #

To use a template as an item type, 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});

  //this method will prevent the override of toString and make the same model useful for different cases
    static String userAsStringByName(UserModel userModel){
      return '#${userModel.id} ${userModel.name}';
    }

    //this method will prevent the override of toString
    static String userAsStringById(UserModel userModel){
      return '#${userModel.id} ${userModel.id}';
    }


  @override
  String toString() => name;

  @override
  operator ==(o) => o is UserModel && o.id == id;

  @override
  int get hashCode => id.hashCode^name.hashCode^createdAt.hashCode;

}

View more Examples #

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

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Uploader

salim.lachdhaf@gmail.com

License

MIT (LICENSE)

Dependencies

flutter

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