Drop-Down Select - FUIInputSelect

The FUIInputSelect is a versatile drop-down select input box that offers a range of functionalities. It can be customized to provide a basic drop-down select box or an enhanced display for selectable items.

The FUIInputSelect widget classes could be found in:

lib/focus_ui_kit/components/input/fui_input_select.dart

The FUIInputSelect class is the theme class holds the default theme variables/values.

Accessing the theme

To access the theme class object, do the following:

@override
Widget build(BuildContext context) {
    FUIInputTheme fuiInputTheme = context.theme.fuiInput;
    
    // ...
}

Usage

To populate the dataList with SingleCategoryModel and SingleItemCategoryModel, we need to create a list of items for the select box.

FUIInputSelect(
    label: 'Select Field',
    hint: 'Select something',
    selectedDataList: [
        SingleItemCategoryModel(value: 'B', nameSingleItem: 'Item 2'),
    ],
    dataList: [
        SingleCategoryModel(
          singleItemCategoryList: [
            // Please have the value data type as 'String'
            SingleItemCategoryModel(value: 'A', nameSingleItem: 'Item 1'),
            SingleItemCategoryModel(value: 'B', nameSingleItem: 'Item 2'),
            SingleItemCategoryModel(value: 'C', nameSingleItem: 'Item 3'),
          ],
        ),
    ],
    onChanged: (selectedValStr) {
    
        // If the selected items is 'Item 1' the selectedValStr will be 'A'. 
        print('selectedValStr: $selectedValStr');
    },
);

The selectedDataList parameter is the pre-selected SingleItemCategoryModel. This SingleItemCategoryModel with the same value must already be present in the dataList.

With / without search

The search/filter box is enabled by default when the drop-down list appears.

To toggle the availability of search/filter bar:

// Enable search/filter bar
FUIInputSelect(
    label: 'Select Field',
    hint: 'Select something',
    isSearchable: true, 
    ...
);

// Disable search/filter bar
FUIInputSelect(
    label: 'Select Field',
    hint: 'Select something',
    isSearchable: false, 
    ...
);

Categorized item list

To group selectable items into categories, do the following:

FUIInputSelect(
  label: 'Select Field',
  hint: 'Select something',
  selectedDataList: [
    SingleItemCategoryModel(value: 'B', nameSingleItem: 'Item 2'),
  ],
  dataList: [
    SingleCategoryModel(
      nameCategory: 'Catagoty 1',
      singleItemCategoryList: [
        SingleItemCategoryModel(value: 'A', nameSingleItem: 'Item 1'),
        SingleItemCategoryModel(value: 'B', nameSingleItem: 'Item 2'),
        SingleItemCategoryModel(value: 'C', nameSingleItem: 'Item 3'),
      ],
    ),
    SingleCategoryModel(
      nameCategory: 'Catagoty 2',
      singleItemCategoryList: [
        SingleItemCategoryModel(value: 'D', nameSingleItem: 'Item 4'),
        SingleItemCategoryModel(value: 'E', nameSingleItem: 'Item 5'),
        SingleItemCategoryModel(value: 'F', nameSingleItem: 'Item 6'),
      ],
    )
  ],
  onChanged: (selectedValStr) {
    print('selectedValStr: $selectedValStr');
  },
);

Extra info on item

To display additional information in the SingleItemCategoryModel, the extraInfoInDropdown parameter must be set to true. Subsequently, a string description value must be assigned to the extraInfoSingleItem field within the SingleItemCategoryModel.

FUIInputSelect(
  label: 'Select Field',
  hint: 'Select something',
  extraInfoInDropdown: true,    // Must enable this !!!
  selectedDataList: [
    SingleItemCategoryModel(
      value: 'B',
      nameSingleItem: 'Item 2',
      extraInfoSingleItem: 'Extra Info for Item 2', // Extra info
    ),
  ],
  dataList: [
    SingleCategoryModel(
      singleItemCategoryList: [
        SingleItemCategoryModel(
          value: 'A',
          nameSingleItem: 'Item 1',
          extraInfoSingleItem: 'Extra Info for Item 1', // Extra info
        ),
        SingleItemCategoryModel(
          value: 'B',
          nameSingleItem: 'Item 2',
          extraInfoSingleItem: 'Extra Info for Item 2',
        ),
        SingleItemCategoryModel(
          value: 'C',
          nameSingleItem: 'Item 3',
          extraInfoSingleItem: 'Extra Info for Item 3',
        ),
      ],
    ),
  ],
  onChanged: (selectedValStr) {
    print('selectedValStr: $selectedValStr');
  },
);

With avatar

The avatar (or any other side item widget) could be included as part of the selectable item or the selected item.

Please assign the avatarSingleItem parameter with an FUIAvatar widget (or any other widget) in the SingleItemCategoryModel.

If the avatarInSingleSelect parameter is set to true, the avatar will be displayed alongside the selected item. Conversely, if avatarInSingleSelect is set to false, only the value specified in nameSingleItem will be displayed.

FUIInputSelect(
  label: 'Select Field',
  hint: 'Select something',
  avatarInSingleSelect: true,   // Set this to true is the avatar is to be displayed as part of the selected item.
  extraInfoInDropdown: true,
  selectedDataList: [
    SingleItemCategoryModel(
      avatarSingleItem: FUIAvatar(
        avatar: AssetImage('demo-avatar/avatar-man-05.jpg'),
      ),
      nameSingleItem: 'Mckinley Davis',
      extraInfoSingleItem: 'Seattle Branch',
    ),
  ],
  dataList: [
    SingleCategoryModel(
      singleItemCategoryList: [
        SingleItemCategoryModel(
          avatarSingleItem: FUIAvatar(
            avatar: AssetImage('demo-avatar/avatar-man-05.jpg'),
          ),
          nameSingleItem: 'Mckinley Davis',
          extraInfoSingleItem: 'Seattle Branch',
        ),
        SingleItemCategoryModel(
          avatarSingleItem: FUIAvatar(
            avatar: AssetImage('demo-avatar/avatar-woman-06.jpg'),
          ),
          nameSingleItem: 'Tanner Bray',
          extraInfoSingleItem: 'Seattle Branch',
        ),
        SingleItemCategoryModel(
          avatarSingleItem: FUIAvatar(
            avatar: AssetImage('demo-avatar/avatar-man-11.jpg'),
          ),
          nameSingleItem: 'Mannas Khan',
          extraInfoSingleItem: 'New York Branch',
        ),
        SingleItemCategoryModel(
            avatar: AssetImage('demo-avatar/avatar-woman-03.jpg'),
          ),
          nameSingleItem: 'Savanna Donovan',
          extraInfoSingleItem: 'New York Branch',
        ),
      ],
    ),
  ],
  onChanged: (selectedValStr) {
    print('selectedValStr: $selectedValStr');
  },
);

Doing things with Controller - FUIInputFieldSelectController

The FUIInputFieldSelectController is largely similar to FUIInputFieldController, with some additional parameters to facilitate the programmatic selection operation.

The FUIInputFieldSelectEvent is the event class for the trigger method in FUIInputFieldSelectController.

Initializing the `FUIInputFieldSelectController`

late FUIInputFieldSelectController fuiInputFieldSelCtrl;

@override
void initState() {
    super.initState();
    fuiInputFieldSelCtrl = FUIInputFieldSelectController();
}

@override
void dispose() {
    fuiInputFieldSelCtrl.close();
    super.dispose();
}

@override
Widget build(BuildContext context) {
    
    // ...
    
    var w = FUIInputSelect(
      fuiInputFieldSelectController: fuiInputFieldSelCtrl,
      label: 'Field Label',
      hint: 'Type something',
    );
    
    // ...
}

Programmatic Population of Data List

Both the dataList and the selectedDataList could be re-populated as the following:

List<SingleCategoryModel> someDataList = [...];
List<SingleItemCategoryModel> someSelectedDataList = [...];

fuiInputFieldSelCtrl.trigger(FUIInputFieldSelectEvent(
  dataList: someDataList,
  selectedDataList: someSelectedDataList,
));

The other functionalities are similar to FUIInputText, as documented in Text Input - FUIInputText.

Parameters

Parameters	Description
List\<SingleCategoryModel\> dataList	The selectable data item list - `SingleCategoryModel` and `SingleItemCategoryModel` within.
List\<SingleItemCategoryModel\>? selectedDataList	The selected item list (should only be one item for now).
bool isSearchable	Toggle search filter box.
bool avatarInSingleSelect	Toggle avatar for single selected item.
bool extraInfoInDropdown	Toggle extra info for item.
FUIInputFieldController? fuiInputFieldController	The controller for the input field.
String? label	The input field label within the box.
String? hint	The subtle hint text on the input field.
bool mandatory	Toggle the display of mandatory indicator.
Widget? mandatoryIndicator	A custom mandatory indicator (if needed).
bool showTopLabelBar	Toggle the display of the top label.
String? initialValue	The initial value (or assign it via textEditingController).
FUIInputSize fuiInputSize	The size of the input box, accepts values from `FUIInputSize` enum.
FUIInputStatusType fuiInputStatusType	The status type of the input box.
String? fuiInputStatusText	The status type text (if any).
Widget? sideIcon	The decorative side icon (if any).
FUIInputSideIconPosition fuiInputSideIconPosition	The position of the side icon.
Color? sideIconBackgroundColor	The background color of the side icon portion.

Other parameters

The other parameters corresponds to the ones available in FUIInputText.

27 March 2025

Focus Theme UI Kit Documentation Help

Drop-Down Select - FUIInputSelect

Widget Class Location

Widget Theme Location

Accessing the theme

Usage

With / without search

Categorized item list

Extra info on item

With avatar

Doing things with Controller - FUIInputFieldSelectController

Initializing the `FUIInputFieldSelectController`

Programmatic Population of Data List

Parameters

Other parameters

Drop-Down Select - FUIInputSelect

Widget Class Location

Widget Theme Location

Accessing the theme

Usage

With / without search

Categorized item list

Extra info on item

With avatar

Doing things with Controller - FUIInputFieldSelectController

Initializing the FUIInputFieldSelectController

Programmatic Population of Data List

Parameters

Other parameters

Initializing the `FUIInputFieldSelectController`