chips_input

Flutter library for building input fields with InputChips as input options.

Usage

Import

import 'package:chips_input/chips_input.dart';

Example

First create some sort of Class that holds the data. You could also use a simple String.

class AppProfile {
  final String name;
  final String email;
  final String imageUrl;

  const AppProfile(this.name, this.email, this.imageUrl);

  @override
  bool operator ==(Object other) =>
      identical(this, other) ||
      other is AppProfile &&
          runtimeType == other.runtimeType &&
          name == other.name;

  @override
  int get hashCode => name.hashCode;

  @override
  String toString() {
    return name;
  }
}

Initialize some data and implement the ChipsInput Widget to your liking.

const mockResults = <AppProfile>[
    AppProfile('John Doe', 'jdoe@flutter.io',
        'https://d2gg9evh47fn9z.cloudfront.net/800px_COLOURBOX4057996.jpg'),
    AppProfile('Paul', 'paul@google.com',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('Fred', 'fred@google.com',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('Brian', 'brian@flutter.io',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('John', 'john@flutter.io',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('Thomas', 'thomas@flutter.io',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('Nelly', 'nelly@flutter.io',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('Marie', 'marie@flutter.io',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('Charlie', 'charlie@flutter.io',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('Diana', 'diana@flutter.io',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('Ernie', 'ernie@flutter.io',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
    AppProfile('Gina', 'fred@flutter.io',
        'https://upload.wikimedia.org/wikipedia/commons/7/7c/Profile_avatar_placeholder_large.png'),
];

ChipsInput(
    maxChips: 3, // remove, if you like infinity number of chips
    initialValue: [mockResults[1]],
    findSuggestions: (String query) {
        if (query.isNotEmpty) {
            var lowercaseQuery = query.toLowerCase();
            final results = mockResults.where((profile) {
            return profile.name
                    .toLowerCase()
                    .contains(query.toLowerCase()) ||
                profile.email
                    .toLowerCase()
                    .contains(query.toLowerCase());
            }).toList(growable: false)
            ..sort((a, b) => a.name
                .toLowerCase()
                .indexOf(lowercaseQuery)
                .compareTo(
                    b.name.toLowerCase().indexOf(lowercaseQuery)));
            return results;
        }
        return mockResults;
    },
    onChanged: (data) {
        print(data);
    },
    chipBuilder: (context, state, AppProfile profile) {
        return InputChip(
            key: ObjectKey(profile),
            label: Text(profile.name),
            avatar: CircleAvatar(
            backgroundImage: NetworkImage(profile.imageUrl),
            ),
            onDeleted: () => state.deleteChip(profile),
            materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
        );
    },
    suggestionBuilder: (context, AppProfile profile) {
        return ListTile(
            key: ObjectKey(profile),
            leading: CircleAvatar(
            backgroundImage: NetworkImage(profile.imageUrl),
            ),
            title: Text(profile.name),
            subtitle: Text(profile.email),
        );
    },
)

Instead of the suggestionBuilder you can also pass an optionsViewBuilder for more customization:

//...
optionsViewBuilder: (context, onSelected, options) {
    return Align(
        alignment: Alignment.topLeft,
        child: Material(
            elevation: 4.0,
            child: Container(
                height: 200.0,
                child: ListView.builder(
                    padding: EdgeInsets.all(8.0),
                    itemCount: options.length,
                    itemBuilder: (BuildContext context, int index) {
                        final option = options.elementAt(index);
                        return GestureDetector(
                            onTap: () {
                                onSelected(option);
                            },
                            child: ListTile(
                                key: ObjectKey(option),
                                leading: CircleAvatar(
                                    backgroundImage: NetworkImage(option.imageUrl),
                                ),
                                title: Text(option.name),
                                subtitle: Text(option.email),
                            ),
                        );
                    },
                ),
            ),
        ),
    );
},
//...

Known issues

findSuggestions currently only supports synchronous suggestions. This is due to the fact, that ChipsInput builds upon the new AutoComplete widget in Flutter 2.0 and this does not support asynchronous data at the moment (see here).

Credit