flutter - How to prevent keyboard autocorrection and suggestion when using DropDownItem - Stack Overflow

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I have a large list that I want to let the user filter by typing into a field. It is working well but the keyboard is giving some unwanted suggestions. I cannot find a proper way to customize the keyboard. I have tried to change the keyboardType, but with no results.

Below is some of my code using DropDownItem

import 'package:flutter/material.dart';
import 'selector_theme.dart';

abstract class DropDownItem {
  String get name;
  String? get code;
}

class DropDownSelector extends StatefulWidget {
  const DropDownSelector({
    super.key,
    required this.itemsList,
    required this.hintText,
    this.selectedItem,
    this.onSelected,
  });
  final List<DropDownItem> itemsList;
  final DropDownItem? selectedItem;
  final void Function(DropDownItem?)? onSelected;
  final String hintText;

  @override
  State<DropDownSelector> createState() => _DropDownSelectorState();
}

class _DropDownSelectorState extends State<DropDownSelector> {
  DropDownItem? selectedItem;
  late final List<DropDownItem> itemsList;
  late final TextEditingController controller;

  @override
  void initState() {
    super.initState();
    controller = TextEditingController();
    itemsList = widget.itemsList;
    selectedItem = widget.selectedItem;
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: DropdownMenu<DropDownItem>(
        controller: controller,
        width: double.infinity,
        leadingIcon: const Icon(Icons.search),
        hintText: widget.hintText,
        requestFocusOnTap: true,
        keyboardType: TextInputType.visiblePassword,
        enableFilter: true,
        inputDecorationTheme: selectorDecorationTheme(context),
        onSelected: (DropDownItem? anItem) {
          FocusScope.of(context).unfocus();
          setState(() {
            selectedItem = anItem;
            widget.onSelected?.call(anItem);
          });
        },
        initialSelection: selectedItem,
        menuStyle: const MenuStyle(
          shape: WidgetStatePropertyAll(RoundedRectangleBorder(
              borderRadius: BorderRadius.all(Radius.circular(20)))),
        ),
        dropdownMenuEntries: itemsList
            .map<DropdownMenuEntry<DropDownItem>>((DropDownItem anItem) {
          return DropdownMenuEntry<DropDownItem>(
            value: anItem,
            label: anItem.name,
          );
        }).toList(growable: false),
      ),
    );
  }
}

I have a large list that I want to let the user filter by typing into a field. It is working well but the keyboard is giving some unwanted suggestions. I cannot find a proper way to customize the keyboard. I have tried to change the keyboardType, but with no results.

Below is some of my code using DropDownItem

import 'package:flutter/material.dart';
import 'selector_theme.dart';

abstract class DropDownItem {
  String get name;
  String? get code;
}

class DropDownSelector extends StatefulWidget {
  const DropDownSelector({
    super.key,
    required this.itemsList,
    required this.hintText,
    this.selectedItem,
    this.onSelected,
  });
  final List<DropDownItem> itemsList;
  final DropDownItem? selectedItem;
  final void Function(DropDownItem?)? onSelected;
  final String hintText;

  @override
  State<DropDownSelector> createState() => _DropDownSelectorState();
}

class _DropDownSelectorState extends State<DropDownSelector> {
  DropDownItem? selectedItem;
  late final List<DropDownItem> itemsList;
  late final TextEditingController controller;

  @override
  void initState() {
    super.initState();
    controller = TextEditingController();
    itemsList = widget.itemsList;
    selectedItem = widget.selectedItem;
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: DropdownMenu<DropDownItem>(
        controller: controller,
        width: double.infinity,
        leadingIcon: const Icon(Icons.search),
        hintText: widget.hintText,
        requestFocusOnTap: true,
        keyboardType: TextInputType.visiblePassword,
        enableFilter: true,
        inputDecorationTheme: selectorDecorationTheme(context),
        onSelected: (DropDownItem? anItem) {
          FocusScope.of(context).unfocus();
          setState(() {
            selectedItem = anItem;
            widget.onSelected?.call(anItem);
          });
        },
        initialSelection: selectedItem,
        menuStyle: const MenuStyle(
          shape: WidgetStatePropertyAll(RoundedRectangleBorder(
              borderRadius: BorderRadius.all(Radius.circular(20)))),
        ),
        dropdownMenuEntries: itemsList
            .map<DropdownMenuEntry<DropDownItem>>((DropDownItem anItem) {
          return DropdownMenuEntry<DropDownItem>(
            value: anItem,
            label: anItem.name,
          );
        }).toList(growable: false),
      ),
    );
  }
}

• flutter

Share Improve this question Follow asked Feb 13 at 15:04 Denis GesbertDenis Gesbert 111 bronze badge

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1 Answer 1

Sorted by: Reset to default 0

Use a Custom TextField Instead

TheDropdownMenu does not provide full control over the keyboard, consider using a custom TextField to filter the list instead

import 'package:flutter/material.dart';

void main() {
  runApp(const MainApp());
}

// DropDownItem Interface
abstract class DropDownItem {
  String get name;
  String? get code;
}

// Example DropDownItem Implementation
class CountryItem implements DropDownItem {
  final String countryName;
  final String countryCode;

  CountryItem(this.countryName, this.countryCode);

  @override
  String get name => countryName;

  @override
  String? get code => countryCode;
}

// MainApp Widget
class MainApp extends StatelessWidget {
  const MainApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Dropdown Selector Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const HomeScreen(),
    );
  }
}

// HomeScreen Widget
class HomeScreen extends StatefulWidget {
  const HomeScreen({super.key});

  @override
  State<HomeScreen> createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  DropDownItem? selectedItem;

  // Sample Data
  final List<DropDownItem> countries = [
    CountryItem('United States', 'US'),
    CountryItem('Canada', 'CA'),
    CountryItem('United Kingdom', 'UK'),
    CountryItem('Germany', 'DE'),
    CountryItem('France', 'FR'),
    CountryItem('Nigeria', 'NG'),
    CountryItem('India', 'IN'),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("Dropdown Selector")),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            DropDownSelector(
              itemsList: countries,
              hintText: "Select a country",
              selectedItem: selectedItem,
              onSelected: (DropDownItem? item) {
                setState(() {
                  selectedItem = item;
                });
              },
            ),
            const SizedBox(height: 20),
            Text(
              selectedItem != null
                  ? "Selected: ${selectedItem!.name} (${selectedItem!.code})"
                  : "No selection",
              style: const TextStyle(fontSize: 18),
            ),
          ],
        ),
      ),
    );
  }
}

// DropDownSelector Widget
class DropDownSelector extends StatefulWidget {
  const DropDownSelector({
    super.key,
    required this.itemsList,
    required this.hintText,
    this.selectedItem,
    this.onSelected,
  });

  final List<DropDownItem> itemsList;
  final DropDownItem? selectedItem;
  final void Function(DropDownItem?)? onSelected;
  final String hintText;

  @override
  State<DropDownSelector> createState() => _DropDownSelectorState();
}

class _DropDownSelectorState extends State<DropDownSelector> {
  DropDownItem? selectedItem;
  late List<DropDownItem> itemsList;
  late final TextEditingController controller;

  @override
  void initState() {
    super.initState();
    controller = TextEditingController();
    itemsList = widget.itemsList;
    selectedItem = widget.selectedItem;
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        TextField(
          controller: controller,
          decoration: InputDecoration(
            prefixIcon: const Icon(Icons.search),
            hintText: widget.hintText,
            border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
          ),
          keyboardType: TextInputType.text,
          autocorrect: false,
          enableSuggestions: false,
          textCapitalization: TextCapitalization.none,
          onChanged: (value) {
            setState(() {
              itemsList = widget.itemsList
                  .where((item) =>
                  item.name.toLowerCase().contains(value.toLowerCase()))
                  .toList();
            });
          },
        ),
        const SizedBox(height: 10),
        Container(
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(12),
            boxShadow: [BoxShadow(color: Colors.black12, blurRadius: 5)],
          ),
          child: Column(
            children: itemsList
                .map(
                  (item) => ListTile(
                title: Text(item.name),
                onTap: () {
                  setState(() {
                    selectedItem = item;
                    controller.text = item.name;
                    widget.onSelected?.call(item);
                  });
                },
              ),
            )
                .toList(),
          ),
        ),
      ],
    );
  }
}

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