Multi Select Nested

Multi Select Nested is a package with nested options support for Flutter.

General Use	Ready-to-use controller	Pass AnimatedContainer: true to use animations	Fully customizable

Features

• Single & multiple select with nested options support
• Rich options & highly customizable

Getting Started

add it to pubspec.yaml

dependencies:
  flutter:
    sdk: flutter
  multiselect_nested: # use latest version    

Import the library

import 'package:multiselect_nested/multiselect_nested.dart';

If you want you can create a MultiSelectNestedController to pass as a prop

import 'package:multiselect_nested/models/multiselect_nested.dart';

MultiSelectNestedController multiSelectController = MultiSelectNestedController();

You can also import the Model: multiselect_nested_item , helpful to use the correct interface when passing the options and the pre-selected items to the library

import 'package:multiselect_nested/models/multiselect_nested_item.dart';

Add the MultiSelectNested widget to your method

import 'package:multiselect_nested/multiselect_nested.dart';
import 'package:multiselect_nested/models/multiselect_nested_item.dart';
import 'package:multiselect_nested/models/multiselect_nested_controller.dart';

List<MultiSelectNestedItem> options = [
    MultiSelectNestedItem(
      id: 1,
      name: 'Option 1',
      children: [],
    ),
    MultiSelectNestedItem(
      id: 2,
      name: 'Option 2 ',
      children: [],
    ),
  ];
List<MultiSelectNestedItem> selected = [];
MultiSelectNestedController multiSelectController = MultiSelectNestedController();
  
MultiSelectNested(
    controller: multiSelectController,
    options: options,
    selectedValues: selected,
    setSelectedValues:
        (List<MultiSelectNestedItem> newValues) {
      setState(() {
        selected = newValues;
      });
    },
  ),

Example with a Future

.
.
.
List<MultiSelectNestedItem> selected = [];
MultiSelectNestedController multiSelectController = MultiSelectNestedController();

Future<List<MultiSelectNestedItem>> getJson() async {
    var data = await rootBundle.loadString('assets/example_data.json');
    return multiSelectItemsFromJson(data);
}
  
FutureBuilder<List<MultiSelectNestedItem>>(
    future: getJson(),
    builder: (BuildContext context,
      AsyncSnapshot<List<MultiSelectNestedItem>> snapshot) {
    switch (snapshot.connectionState) {
      case ConnectionState.waiting:
        return const Text('Loading....');
      default:
        if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}');
        } else {
          return Column(
            children: [
              MultiSelectNested(
                controller: multiSelectController,
                options: snapshot.data!,
                selectedValues: selected,
                setSelectedValues:
                    (List<MultiSelectNestedItem> newValues) {
                  setState(() {
                    selected = newValues;
                  });
                },
              ),
            ],
          );
        }
    }
  },
),
.
.
.

See the complete example

Example

Constructor

Parameter	Type	Description
options	List< MultiSelectNestedItem >	The options which a user can see and select.
selectedValues	List< MultiSelectNestedItem >	Preselected options.
setSelectedValues	Function(List< MultiSelectNestedItem >)?	Callback to pass the selectedValues to the parent. It's triggered when you add or remove elements from the selected items. Only works with the liveUpdateValues set to true
liveUpdateValues	bool	Set to true if you want a live update of the values. Be careful because it will trigger e rebuild on every added or removed element from the selectedValues which remove the smooth effect from the dropdown container.
checkParentWhenChildIsSelected	bool	Add a partial check to the parent when one of his child is selected. Be careful this works only with not multi hierarchical child
controller	MultiSelectNestedController	Use this controller to get access to internal state of the Multiselect.
paddingDropdown	EdgeInsets	Padding Dropdown content.
paddingSelectedItems	EdgeInsets	Padding Row Selected Items.
isAnimatedContainer	bool	Set to true to use an Animated container which can accept Curve's effects.
effectAnimatedContainer	Curve	Customize the effect of the animated container.
durationEffect	Duration	Duration of the Effect of the Animated Container.
heightDropdownContainer	double	Height of the Animated Container. This value is only read with the Animated Container set to true because it requires a specific height to work. If it is not set, will be used the default height as value.
heightDropdownContainerDefault	Duration	Overwrite the default height of the animated container.
dropdownContainerColor	Color	Background Color of the Collapsible Dropdown.
selectedItemColor	Color	Background Color of the Selected Items.
selectedItemDividerColor	Color	Color of the divider between the selected items.
collapsedIconColor	Color	Color of icon when items are collapsed.
selectedItemsRowColor	Color	Color of the row of the selected items.
noItemsText	String	Text to display in case of no items are provided.
noItemsTextStyle	TextStyle	Text Style of noItemsText.
styleDropdownItemName	TextStyle	Text Style of the labels inside the dropdown.

. . .

Contributing

Pull requests are always welcome. Please open an issue first to discuss what you would like to change.

Follow me to get updated

The Next Releases will implement these features.

• Async searching
• Delayed loading (load data of deep level options only when needed)

Stay Tuned!