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.
To use this plugin, add flutter_form_builder as a dependency in your pubspec.yaml file.
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");
}
},
),
- Improve documentation by showing complete list of input types and their usage and options
- Assert no duplicates in
FormBuilderInputsattributenames - Add more
FormBuilderInputtypes:- 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
- Proper validation for URL [doesn't work without http(s)]