Flutter FormBuilder - flutter_form_builder

This widget helps in generation of forms in Flutter. Wraps common input types with FormField allowing validation, change detection, setting input value etc and have them in a single form

Saves you some common validations such as: required fields, number, email & url validity, min and max values for numbers, min and max character length for string based fields as well as allow you to include your own custom validation

On submission, the form returns a Map<String, dynamic> of form values if the form is valid or null otherwise.

Usage

To use this plugin, add flutter_form_builder as a dependency in your pubspec.yaml file.

Example

FormBuilder(
  context,
  autovalidate: true,
  showResetButton: true,
  // resetButtonContent: Text("Clear Form"),
  controls: [
    FormBuilderInput.typeAhead(
      label: 'Country',
      attribute: 'country',
      require: true,
      itemBuilder: (context, country) {
        return ListTile(
          title: Text(country),
        );
      },
      suggestionsCallback: (query) {
        if (query.length != 0) {
          var lowercaseQuery = query.toLowerCase();
          return allCountries.where((country) {
            return country.toLowerCase().contains(lowercaseQuery);
          }).toList(growable: false)
            ..sort((a, b) => a
                .toLowerCase()
                .indexOf(lowercaseQuery)
                .compareTo(b.toLowerCase().indexOf(lowercaseQuery)));
        } else {
          return allCountries;
        }
      },
    ),
    FormBuilderInput.chipsInput(
      label: 'Chips',
      attribute: 'chips_test',
      require: true,
      value: [
        AppProfile('Andrew', 'stock@man.com',
            'https://d2gg9evh47fn9z.cloudfront.net/800px_COLOURBOX4057996.jpg')
      ],
      suggestionsCallback: (String query) {
        if (query.length != 0) {
          var lowercaseQuery = query.toLowerCase();
          return 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)));
        } else {
          return const <AppProfile>[];
        }
      },
      chipBuilder: (context, state, 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, state, profile) {
        return ListTile(
          key: ObjectKey(profile),
          leading: CircleAvatar(
            backgroundImage: NetworkImage(profile.imageUrl),
          ),
          title: Text(profile.name),
          subtitle: Text(profile.email),
          onTap: () => state.selectSuggestion(profile),
        );
      },
    ),
    FormBuilderInput.textField(
      type: FormBuilderInput.TYPE_TEXT,
      attribute: "name",
      label: "Name",
      require: true,
      min: 3,
    ),
    FormBuilderInput.dropdown(
      attribute: "dropdown",
      require: true,
      label: "Dropdown",
      hint: "Select Option",
      options: [
        FormBuilderInputOption(value: "Option 1"),
        FormBuilderInputOption(value: "Option 2"),
        FormBuilderInputOption(value: "Option 3"),
      ],
    ),
    FormBuilderInput.number(
      attribute: "age",
      label: "Age",
      require: true,
      min: 18,
    ),
    FormBuilderInput.textField(
      type: FormBuilderInput.TYPE_EMAIL,
      attribute: "email",
      label: "Email",
      require: true,
    ),
    FormBuilderInput.textField(
      type: FormBuilderInput.TYPE_URL,
      attribute: "url",
      label: "URL",
      require: true,
    ),
    FormBuilderInput.textField(
        type: FormBuilderInput.TYPE_PHONE,
        attribute: "phone",
        label: "Phone",
        hint: "Including country code (+254)"
        //require: true,
        ),
    FormBuilderInput.password(
      attribute: "password",
      label: "Password",
      min: 8,
    ),
    FormBuilderInput.datePicker(
      label: "Date of Birth",
      attribute: "dob",
      firstDate: DateTime(1970),
      lastDate: DateTime.now().add(Duration(days: 1)),
      format: 'dd, MM yyyy'
    ),
    FormBuilderInput.timePicker(
      label: "Appointment Time",
      attribute: "time",
    ),
    FormBuilderInput.checkboxList(
      label: "The Languages of my people",
      hint: "The Languages of my people",
      attribute: "languages",
      require: false,
      value: ["Dart"],
      options: [
        FormBuilderInputOption(value: "Dart"),
        FormBuilderInputOption(value: "Kotlin"),
        FormBuilderInputOption(value: "Java"),
        FormBuilderInputOption(value: "Swift"),
        FormBuilderInputOption(value: "Objective-C"),
      ],
    ),
    FormBuilderInput.radio(
      label: "My Best Language",
      attribute: "best_language",
      require: true,
      options: ["Dart", "Kotlin", "Java", "Swift", "Objective-C"]
          .map((lang) => FormBuilderInputOption(value: lang))
          .toList(growable: false),
    ),
    FormBuilderInput.checkbox(
        label: "I accept the terms and conditions",
        attribute: "accept_terms",
        hint:
            "Kindly make sure you've read all the terms and conditions",
        validator: (value) {
          if (!value) return "Accept terms to continue";
        }),
    FormBuilderInput.switchInput(
        label: "I accept the terms and conditions",
        attribute: "accept_terms_switch",
        hint:
            "Kindly make sure you've read all the terms and conditions",
        validator: (value) {
          if (!value) return "Accept terms to continue";
        }),
    FormBuilderInput.slider(
      label: "Slider",
      attribute: "slider",
      hint: "Hint",
      min: 0.0,
      require: true,
      max: 100.0,
      value: 10.0,
      divisions: 20,
    ),
    FormBuilderInput.stepper(
      label: "Stepper",
      attribute: "stepper",
      value: 10,
      step: 1,
      hint: "Hint",
    ),
    FormBuilderInput.rate(
      label: "Rate",
      attribute: "rate",
      iconSize: 32.0,
      value: 1,
      max: 5,
      hint: "Hint",
    ),
    FormBuilderInput.segmentedControl(
      label: "Movie Rating (Archer)",
      attribute: "movie_rating",
      require: true,
      options: List.generate(5, (i) => i + 1)
          .map((number) => FormBuilderInputOption(value: number))
          .toList(),
    ),
  ],
  onChanged: (formValue) {
    print(formValue);
  },
  onSubmit: (formValue) {
    if (formValue != null) {
      print(formValue);
    } else {
      print("Form invalid");
    }
  },
),

TODO:

• Improve documentation by showing complete list of input types and their usage and options
• Assert no duplicates in FormBuilderInputs attribute names
• Add more FormBuilderInput types:
  • RangeSlider
  • ColorPicker
  • MaskedText
• Allow options for Checkboxes and Radios to appear left or right
• Allow addition of custom input types
• Fire onChanged() on every control allowing reaction to changes

KNOWN ISSUES - HELP NEEDED (Send help ;-P)

• Proper validation for URL doesn't work without http(s)