survey_flow 1.0.1

Onboarding/Survey flow manager for Flutter

Survey flow for Flutter

Survey Flow is a Flutter package that provides a framework for creating surveys or quizzes within your app. It allows you to easily define a survey's structure and customize its appearance, and it includes a range of pre-built widgets to help you display questions and collect user responses.

Inspired by survey_kit.

Example

Custom design + bottom sheet

Installation

To use Survey Flow in your Flutter app, add it to your pubspec.yaml file:

dependencies:
  survey_flow: ^latest_version

Then, run flutter pub get to download the package.

Usage

To use Survey Flow, import the package in your Dart code:

import 'package:survey_flow/survey_flow.dart';

Creating a Survey

To create a survey, use the one of the SurveyStep classes or create your own:

final List<SurveyStep> steps = [
   InformationStep(
      title: 'Information title',
      description: 'Bla bla bla description for this step',
      image: StepImage.svg(
         'https://www.svgrepo.com/show/24762/round-done-button.svg',
         source: StepImageSource.network,
         width: 0.3,
      ),
      primaryButton: StepButton(
         action: 'action:notificationsPermission',
         text: 'Next',
      ),
   ),
];

Predefined step types and components documentation you can find below. More examples you can find in this Example repository.

Displaying a Survey

To display a survey, use the SurveyFlow widget:

class MySurveyScreen extends StatefulWidget {
   @override
   _MySurveyScreenState createState() => _MySurveyScreenState();
}

class _MySurveyScreenState extends State<MySurveyScreen> {
   final List<SurveyStep> survey = // create your survey here

   @override
   Widget build(BuildContext context) {
      return Scaffold(
         appBar: AppBar(title: Text('My Survey')),
         body: SurveyFlow(
            initialSteps: survey,
            onSubmit: (results) {
               // handle the survey results here
            },
            onFinish: () {
               // handle the survey finished here
            },
         ),
      );
   }
}

In this example, we've created a screen that displays a SurveyFlow widget with our SurveySteps, an onSubmit callback that will be called when user submits the last step or some step has a submit action (you can find how actions works in the documentation below) and onFinish callback that will be called when the user completes the survey.

Displaying a modal Survey

To display a modal survey, use the showModalSurveyFlow function:

final List<SurveyStep> survey = // create your survey here

showModalSurveyFlow(
   context: context,
   initialSteps: survey, 
   onSubmit: (results) {
      // handle the survey results here
   },
   onFinish: () {
      // handle the survey finished here
   },
);

Predefined step types:

InformationStep

InformationStep(
   title: 'Information title',
   description: 'Bla bla bla description for this step',
   image: StepImage.svg(
      'https://www.svgrepo.com/show/24762/round-done-button.svg',
      source: StepImageSource.network,
      width: 0.3,
   ),
   primaryButton: StepButton.next(),
);

Parameter	Default	Description
id String?	Null	Step id. Can be used for custom steps navigation.
title String	required	Title that will be displayed on the step.
description String?	Null	Description that will be displayed on the step.
image StepImage?	Null	Image that will be displayed on the step. Read more about StepImage below.
backgroundImage StepImage?	Null	Image that will be displayed on the background. Read more about StepImage below.
primaryButton StepButton	StepButton.next()	Primary button with step action. Read more about StepButton below.
secondaryButton StepButton?	Null	Secondary button with step action. Read more about StepButton below.
buttonsAlignment ButtonsAlignment	ButtonsAlignment.vertical	Defines how buttons should be aligned - vertically or horizontally.

SingleSelectStep

SingleSelectStep(
  title: 'Select one option to move forward',
  description: 'Bla bla bla description for this step',
  options: [
     SelectOption(
        text: 'Custom navigation option',
        description:
        'If you select this option number_request_step would be opened next',
        value: 'option_1',
        navigationConditions: [
           ButtonNavigationCondition(
            nextStepId: 'number_request_step',
           ),
        ],
    ),
     SelectOption(
        text: 'Notification permission',
        value: 'option_2',
        action: 'action:notificationsPermission',
     ),
     SelectOption(
        text: 'Option 3',
        description:
        'Option long description that should take at least two rows',
        value: 'option_3',
     ),
     SelectOption(
        text: 'Option 4',
        value: 'option_4',
     ),
  ],
);

Parameter	Default	Description
id String?	Null	Step id. Can be used for custom steps navigation.
title String	required	Title that will be displayed on the step.
options List	required	Options list. Read more about SelectOption below.
description String?	Null	Description that will be displayed on the step.
backgroundImage StepImage?	Null	Image that will be displayed on the background. Read more about StepImage below.

MultiSelectStep

MultiSelectStep(
   title: 'Select from 1 to 2 options to move forward',
   description: 'Bla bla bla description for this step',
   minimumAmountOfOptionsSelected: 1,
   maximumAmountOfOptionsSelected: 2,
   options: [
      SelectOption(
         text: 'Option 1',
         description: 'Option description',
         value: 'option_1',
      ),
      SelectOption(
         text: 'Option 2',
         value: 'option_2',
      ),
      SelectOption(
         text: 'Option 3',
         description:
         'Option long description that should take at least two rows',
         value: 'option_3',
      ),
      SelectOption(
         text: 'Option 4',
         value: 'option_4',
      ),
   ],
);

Parameter	Default	Description
id String?	Null	Step id. Can be used for custom steps navigation.
title String	required	Title that will be displayed on the step.
options List	required	Options list. Read more about SelectOption below.
description String?	Null	Description that will be displayed on the step.
backgroundImage StepImage?	Null	Image that will be displayed on the background. Read more about StepImage below.
primaryButton StepButton	StepButton.next()	Primary button with step action. Read more about StepButton below.
minimumAmountOfOptionsSelected int?	Null	Number of minimum options selected to enable the button.
maximumAmountOfOptionsSelected int?	Null	Number of maximum options selected.

NumberRequestStep

NumberRequestStep(
   id: 'number_request_step',
   title: 'Number request title',
   description: 'Bla bla bla description for this step',
   hint: 'Your age',
   primaryButton: StepButton.next(
      predicate: ButtonPredicate.moreThan(18),
   ),
   secondaryButton: StepButton.skip(),
);

Parameter	Default	Description
id String?	Null	Step id. Can be used for custom steps navigation.
title String	required	Title that will be displayed on the step.
description String?	Null	Description that will be displayed on the step.
primaryButton StepButton	StepButton.next()	Primary button with step action. Read more about StepButton below.
secondaryButton StepButton?	Null	Secondary button with step action. Read more about StepButton below.
buttonsAlignment ButtonsAlignment	ButtonsAlignment.vertical	Defines how buttons should be aligned - vertically or horizontally.
backgroundImage StepImage?	Null	Image that will be displayed on the background. Read more about StepImage below.
hint String?	Null	Text field hint.
type RequestType	RequestType.numberInt	Requested data type. Read more RequestType values below.

TextRequestStep

TextRequestStep(
   title: 'Text request title',
   description: 'Bla bla bla description for this step',
   hint: 'Your name',
   primaryButton: StepButton.next(),
   secondaryButton: StepButton.skip(),
);

Parameter	Default	Description
id String?	Null	Step id. Can be used for custom steps navigation.
title String	required	Title that will be displayed on the step.
description String?	Null	Description that will be displayed on the step.
primaryButton StepButton	StepButton.next()	Primary button with step action. Read more about StepButton below.
secondaryButton StepButton?	Null	Secondary button with step action. Read more about StepButton below.
buttonsAlignment ButtonsAlignment	ButtonsAlignment.vertical	Defines how buttons should be aligned - vertically or horizontally.
backgroundImage StepImage?	Null	Image that will be displayed on the background. Read more about StepImage below.
hint String?	Null	Text field hint.
type RequestType	RequestType.text	Requested data type. Read more RequestType values below.

DateRequestStep

DateRequestStep(
   title: 'Date request title',
   description: 'Bla bla bla description for this step',
   hint: 'Your date of birth',
   primaryButton: StepButton.next(),
);

Parameter	Default	Description
id String?	Null	Step id. Can be used for custom steps navigation.
title String	required	Title that will be displayed on the step.
description String?	Null	Description that will be displayed on the step.
primaryButton StepButton	StepButton.next()	Primary button with step action. Read more about StepButton below.
secondaryButton StepButton?	Null	Secondary button with step action. Read more about StepButton below.
buttonsAlignment ButtonsAlignment	ButtonsAlignment.vertical	Defines how buttons should be aligned - vertically or horizontally.
backgroundImage StepImage?	Null	Image that will be displayed on the background. Read more about StepImage below.
hint String?	Null	Text field hint.
dateFormat String?	Null	Default 'd MMMM yyyy' for date, 'hh:mm' for time and 'd MMM yyyy hh:mm' for datetime.
type RequestType	RequestType.date	Requested data type. Read more RequestType values below.

Custom Step

class CustomSurveyStep implements SurveyStep {
   const CustomSurveyStep({
      required this.id,
      required this.title,
      required this.description,
      required this.primaryButton,
      required this.image,
      this.backgroundImage,
   });

   @override
   final String id;

   @override
   final String title;

   @override
   final String description;

   @override
   final StepImage? backgroundImage;

   final StepImage image;
   final StepButton primaryButton;
}

You can create your own step by inheriting from SurveyStep and add you custom widget handler for it. Only imagination is your limit ☺️

RequestType

enum RequestType {
  text,
  textMultiline,
  name,
  email,
  numberInt,
  numberDouble,
  date,
  time,
  dateAndTime,
}

StepButton

Parameter	Default	Description
id String?	Null	Button id.
text String	required	Button title.
action String	required	Button action. What should be done when user clicks on the button. You can find few default actions in StepActions.
style StepButtonStyle	StepButtonStyle.elevated	Button style elevated, outlined or text. Widget styles could be defined using SurveyFlowThemeData in SurveyFlow.
type StepButtonType	StepButtonType.primary	Button type primary or secondary. Widget styles could be defined using SurveyFlowThemeData in SurveyFlow.
navigationConditions List	Null	Navigation conditions that would define where should we navigate on button click. Read more about ButtonNavigationCondition below.
predicate ButtonPredicate?	Null	Predicate that will define when button should be enabled or disabled. Read more about ButtonPredicate below.

enum StepButtonType { primary, secondary }

enum StepButtonStyle { elevated, outlined, text }

ButtonPredicate

Is used to define when button should be enabled or disabled. Works by default on Request steps.

For example, if you want button to be enabled on the NumberRequestScreen only if provided number is more than 18, you should use predicate like:

ButtonPredicate.moreThan(18);

Parameter	Default	Description
type ButtonPredicateType	required	Predicate type. You can find enum values below.
value dynamic	Null	Value which be used to compare depending on the type.

enum ButtonPredicateType {
   notEmpty,
   lengthMoreThan,
   matches,
   equals,
   lessThan,
   moreThan,
}

ButtonNavigationCondition

Is used to define where used should be navigated on button click. Can have many conditions with different step ids.

For example, if you want to navigate to step with id 'my_step_id' only if provided number is more than 18, you should use navigation condition like:

ButtonNavigationCondition.moreThan('my_step_id', 18);

Parameter	Default	Description
type ButtonNavigationConditionType	ButtonNavigationConditionType.nextStep	Navigation condition type. You can find enum values below.
nextStepId String	required	Id of the step that should be opened.
value dynamic	Null	Value which be used to compare depending on the type.

enum ButtonNavigationConditionType {
   nextStep,
   notEmpty,
   lengthMoreThan,
   matches,
   equals,
   lessThan,
   moreThan,
}

SelectOption

Select option is child of StepButton, so action and navigationConditions works just the same way.

Parameter	Default	Description
id String?	Null	Button id.
text String	required	Button title.
value dynamic	required	Value of the option that will be stored as step result.
description String?	Null	Description that will be displayed on the step.
action String	StepActions.next	Button action. What should be done when user clicks on the button. You can find few default actions in StepActions.
navigationConditions List	Null	Navigation conditions that would define where should we navigate on button click. Read more about ButtonNavigationCondition below.

StepImage

Image that can be displayed on the step or step background. Supports different sources (local or network) and image types (default images as png, jpeg etc., svg and lottie animations).

StepImage.svg(
   'assets/badge.svg',
   source: StepImageSource.local,
   position: ImagePosition(right: 0.0, top: 0.0),
)

Parameter	Default	Description
path String	required	Image path like url or local path.
source StepImageSource	required	Image source local or network.
type StepImageType	required	Image type image, svg or lottie.
width double?	Null	Image width. If less than 1 will use that value as fraction of screen width.
height double?	Null	Image height.
position ImagePosition?	Null	Position of image on the screen. Usually used to position background image.
opacity double	1.0	Image opacity.

enum StepImageSource {
  local,
  network,
}

enum StepImageType {
   image,
   svg,
   lottie,
}

SurveyFlowThemeData

You set your own style for the survey using SurveyFlowThemeData for SurveyFlow widget.

Json Serialization

You can use json to provide steps for your survey. Every model supports json serialization.

That means that you can use Firebase Remote Config, local jsons, your own backend or any other service to dynamically change your survey without updating the application.

// if you have your own step, add converter to stepsConverters
stepsConverters.addAll({
  'customStep': (v) => CustomSurveyStep.fromJson(v),
});

final String initialStepsData = await rootBundle.loadString("assets/initial_steps.json");
final List<dynamic> initialStepsDecoded = jsonDecode(initialStepsData);

// use SurveyStepConverter to convert models from json
// You can use this converter directly inside model with annotation.
final List<SurveyStep> initialSteps = initialStepsDecoded
        .map((e) =>
            const SurveyStepConverter().fromJson(e as Map<String, dynamic>?))
        .toList();

[
   {
      "id": "information_svg_step",
      "stepType": "information",
      "title": "Information title",
      "description": "Bla bla bla description for this step",
      "image": {
         "path": "https://www.svgrepo.com/show/24762/round-done-button.svg",
         "source": "network",
         "type": "svg",
         "width": 0.3
      },
      "primaryButton": {
         "action": "action:showBottomSheetSurvey",
         "text": "Next"
      }
   }
]

Features:

1. ✅ Submit steps result
2. ✅ Update steps list
3. ✅ Loading state
4. ✅ Widgets
   1. ✅ Information
   2. ✅ Single select
   3. ✅ Multi select
   4. ✅ Number request
   5. ✅ Date request
   6. ✅ Text request
5. ✅ Custom actions
6. ✅ Custom steps
7. ✅ Custom styling (use inherited widget theme)
8. ✅ JsonSerializable
9. ✅ Extend styling for components, check default style
10. ✅ Primary button disabled predicate for RequestScreens
11. ✅ Custom next step navigation
12. ✅ Button navigation conditions
13. ✅ Buttons alignment (horizontal / vertical)
14. ✅ BottomSheet view

Contributing

Feel free to contact me ([e-mail]) or create Pull Requests/Issues for this repository :)

License

Survey Flow is licensed under the MIT License.