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Description:

flutter searchable dropdown

flutter_searchable_dropdown #
Widget to let the user search through a keyword string typed on a customizable keyboard in a single or multiple choices list presented as a dropdown in a dialog box or a menu.
Platforms #
This widget has been successfully tested on iOS, Android and Chrome.
Examples #
The following examples are extracted from the example project available in the repository.
Gallery #
See code below.

Example name
Demonstration

Single dialog

Multi dialog

Single done buttondialog

Multi custom displaydialog

Multi select 3 dialog

Single menu

Multi menu

Multi menu selectall/none

Multi dialog selectall/none without clear

Single dialog customkeyboard

Single dialog object

Single dialog overflow

Single dialog readOnly

Single dialog disabled

Code #
Plugin usage
Add to your pubspec.yaml in the dependencies section:
searchable_dropdown:
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Get packages with command:
flutter packages get
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Import:
import 'package:searchable_dropdown/searchable_dropdown.dart';
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Call either the single choice or the multiple choice constructor.
Single choice constructor
Search choices Widget with a single choice that opens a dialog or a menu to let the user do the selection conveniently with a search.
factory SearchableDropdown.single({
Key key,
@required List<DropdownMenuItem<T>> items,
@required Function onChanged,
T value,
TextStyle style,
dynamic searchHint,
dynamic hint,
dynamic disabledHint,
dynamic icon = const Icon(Icons.arrow_drop_down),
dynamic underline,
dynamic doneButton,
dynamic label,
dynamic closeButton = "Close",
bool displayClearIcon = true,
Icon clearIcon = const Icon(Icons.clear),
Color iconEnabledColor,
Color iconDisabledColor,
double iconSize = 24.0,
bool isExpanded = false,
bool isCaseSensitiveSearch = false,
Function searchFn,
Function onClear,
Function selectedValueWidgetFn,
TextInputType keyboardType = TextInputType.text,
Function validator,
bool assertUniqueValue = true,
Function displayItem,
bool dialogBox = true,
BoxConstraints menuConstraints,
bool readOnly: false,
Color menuBackgroundColor,
}
)
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items with child: Widget displayed ; value: any object with .toString() used to match search keyword.
onChanged Function with parameter: value not returning executed after the selection is done.
value value to be preselected.
style used for the hint if it is given is String.
searchHint String|Widget|Function with no parameter returning String|Widget displayed at the top of the search dialog box.
hint String|Widget|Function with no parameter returning String|Widget displayed before any value is selected or after the selection is cleared.
disabledHint String|Widget|Function with no parameter returning String|Widget displayed instead of hint when the widget is displayed.
icon String|Widget|Function with parameter: value returning String|Widget displayed next to the selected item or the hint if none.
underline String|Widget|Function with parameter: value returning String|Widget displayed below the selected item or the hint if none.
doneButton String|Widget|Function with parameter: value returning String|Widget displayed at the top of the search dialog box.
label String|Widget|Function with parameter: value returning String|Widget displayed above the selected item or the hint if none.
closeButton String|Widget|Function with parameter: value returning String|Widget displayed at the bottom of the search dialog box.
displayClearIcon whether or not to display an icon to clear the selected value.
clearIcon Icon to be used for clearing the selected value.
iconEnabledColor Color to be used for enabled icons.
iconDisabledColor Color to be used for disabled icons.
iconSize for the icons next to the selected value (icon and clearIcon).
isExpanded can be necessary to avoid pixel overflows (zebra symptom).
isCaseSensitiveSearch only used when searchFn is not specified.
searchFn Function with parameters: keyword, items returning List
onClear Function with no parameter not returning executed when the clear icon is tapped.
selectedValueWidgetFn Function with parameter: item returning Widget to be used to display the selected value.
keyboardType used for the search.
validator Function with parameter: value returning String displayed below selected value when not valid and null when valid.
assertUniqueValue whether to run a consistency check of the list of items.
displayItem Function with parameters: item, selected returning Widget to be displayed in the search list.
dialogBox whether the search should be displayed as a dialog box or as a menu below the selected value if any.
menuConstraints BoxConstraints used to define the zone where to display the search menu. Example: BoxConstraints.tight(Size.fromHeight(250)) . Not to be used for dialogBox = true.
readOnly bool whether to let the user choose the value to select or just present the selected value if any.
menuBackgroundColor Color background color of the menu whether in dialog box or menu mode.

Multiple choice constructor
Search choices Widget with a multiple choice that opens a dialog or a menu to let the user do the selection conveniently with a search.
SearchableDropdown<T>.multiple(
{
Key key,
@required List<DropdownMenuItem<T>> items,
@required Function onChanged,
List<int> selectedItems: const [],
TextStyle style,
dynamic searchHint,
dynamic hint,
dynamic disabledHint,
dynamic icon: const Icon(Icons.arrow_drop_down),
dynamic underline,
dynamic doneButton: "Done",
dynamic label,
dynamic closeButton: "Close",
bool displayClearIcon: true,
Icon clearIcon: const Icon(Icons.clear),
Color iconEnabledColor,
Color iconDisabledColor,
double iconSize: 24.0,
bool isExpanded: false,
bool isCaseSensitiveSearch: false,
Function searchFn,
Function onClear,
Function selectedValueWidgetFn,
TextInputType keyboardType: TextInputType.text,
Function validator,
Function displayItem,
bool dialogBox: true,
BoxConstraints menuConstraints,
bool readOnly: false,
Color menuBackgroundColor,
}
)
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items with child: Widget displayed ; value: any object with .toString() used to match search keyword.
onChanged Function with parameter: selectedItems not returning executed after the selection is done.
selectedItems indexes of items to be preselected.
style used for the hint if it is given is String.
searchHint String|Widget|Function with no parameter returning String|Widget displayed at the top of the search dialog box.
hint String|Widget|Function with no parameter returning String|Widget displayed before any value is selected or after the selection is cleared.
disabledHint String|Widget|Function with no parameter returning String|Widget displayed instead of hint when the widget is displayed.
icon String|Widget|Function with parameter: selectedItems returning String|Widget displayed next to the selected items or the hint if none.
underline String|Widget|Function with parameter: selectedItems returning String|Widget displayed below the selected items or the hint if none.
doneButton String|Widget|Function with parameter: selectedItems returning String|Widget displayed at the top of the search dialog box. Cannot be null in multiple selection mode.
label String|Widget|Function with parameter: selectedItems returning String|Widget displayed above the selected items or the hint if none.
closeButton String|Widget|Function with parameter: selectedItems returning String|Widget displayed at the bottom of the search dialog box.
displayClearIcon whether or not to display an icon to clear the selected values.
clearIcon Icon to be used for clearing the selected values.
iconEnabledColor Color to be used for enabled icons.
iconDisabledColor Color to be used for disabled icons.
iconSize for the icons next to the selected values (icon and clearIcon).
isExpanded can be necessary to avoid pixel overflows (zebra symptom).
isCaseSensitiveSearch only used when searchFn is not specified.
searchFn Function with parameters: keyword, items returning List
onClear Function with no parameter not returning executed when the clear icon is tapped.
selectedValueWidgetFn Function with parameter: item returning Widget to be used to display the selected values.
keyboardType used for the search.
validator Function with parameter: selectedItems returning String displayed below selected values when not valid and null when valid.
displayItem Function with parameters: item, selected returning Widget to be displayed in the search list.
dialogBox whether the search should be displayed as a dialog box or as a menu below the selected values if any.
menuConstraints BoxConstraints used to define the zone where to display the search menu. Example: BoxConstraints.tight(Size.fromHeight(250)) . Not to be used for dialogBox = true.
readOnly bool whether to let the user choose the value to select or just present the selected value if any.
menuBackgroundColor Color background color of the menu whether in dialog box or menu mode.

Example app usage
Clone repository:
git clone https://github.com/icemanbsi/searchable_dropdown.git
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Go to plugin folder:
cd searchable_dropdown
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Optionally enable web:
flutter config --enable-web
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Create project:
flutter create .
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To run automated tests:
flutter test
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Optionally generate documentation:
pub global activate dartdoc
dartdoc
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Go to example app folder:
cd example
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To run web:
run -d chrome
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To build web to folder build/web:
flutter build web
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To run on a connected device:
flutter run
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To build Android app to build/app/outputs/apk/release/app-release.apk:
flutter build apk
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To build iOS app on Mac:
flutter build ios
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Single dialog
SearchableDropdown.single(
items: items,
value: selectedValue,
hint: "Select one",
searchHint: "Select one",
onChanged: (value) {
setState(() {
selectedValue = value;
});
},
isExpanded: true,
),
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Multi dialog
SearchableDropdown.multiple(
items: items,
selectedItems: selectedItems,
hint: Padding(
padding: const EdgeInsets.all(12.0),
child: Text("Select any"),
),
searchHint: "Select any",
onChanged: (value) {
setState(() {
selectedItems = value;
});
},
closeButton: (selectedItems) {
return (selectedItems.isNotEmpty
? "Save ${selectedItems.length == 1 ? '"' + items[selectedItems.first].value.toString() + '"' : '(' + selectedItems.length.toString() + ')'}"
: "Save without selection");
},
isExpanded: true,
),
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Single done button dialog
SearchableDropdown.single(
items: items,
value: selectedValue,
hint: "Select one",
searchHint: "Select one",
onChanged: (value) {
setState(() {
selectedValue = value;
});
},
doneButton: "Done",
displayItem: (item, selected) {
return (Row(children: [
selected
? Icon(
Icons.radio_button_checked,
color: Colors.grey,
)
: Icon(
Icons.radio_button_unchecked,
color: Colors.grey,
),
SizedBox(width: 7),
Expanded(
child: item,
),
]));
},
isExpanded: true,
),
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Multi custom display dialog
SearchableDropdown.multiple(
items: items,
selectedItems: selectedItems,
hint: Padding(
padding: const EdgeInsets.all(12.0),
child: Text("Select any"),
),
searchHint: "Select any",
onChanged: (value) {
setState(() {
selectedItems = value;
});
},
displayItem: (item, selected) {
return (Row(children: [
selected
? Icon(
Icons.check,
color: Colors.green,
)
: Icon(
Icons.check_box_outline_blank,
color: Colors.grey,
),
SizedBox(width: 7),
Expanded(
child: item,
),
]));
},
selectedValueWidgetFn: (item) {
return (Center(
child: Card(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10),
side: BorderSide(
color: Colors.brown,
width: 0.5,
),
),
margin: EdgeInsets.all(12),
child: Padding(
padding: const EdgeInsets.all(8),
child: Text(item.toString()),
))));
},
doneButton: (selectedItemsDone, doneContext) {
return (RaisedButton(
onPressed: () {
Navigator.pop(doneContext);
setState(() {});
},
child: Text("Save")));
},
closeButton: null,
style: TextStyle(fontStyle: FontStyle.italic),
searchFn: (String keyword, items) {
List<int> ret = List<int>();
if (keyword != null && items != null && keyword.isNotEmpty) {
keyword.split(" ").forEach((k) {
int i = 0;
items.forEach((item) {
if (k.isNotEmpty &&
(item.value
.toString()
.toLowerCase()
.contains(k.toLowerCase()))) {
ret.add(i);
}
i++;
});
});
}
if (keyword.isEmpty) {
ret = Iterable<int>.generate(items.length).toList();
}
return (ret);
},
clearIcon: Icon(Icons.clear_all),
icon: Icon(Icons.arrow_drop_down_circle),
label: "Label for multi",
underline: Container(
height: 1.0,
decoration: BoxDecoration(
border:
Border(bottom: BorderSide(color: Colors.teal, width: 3.0))),
),
iconDisabledColor: Colors.brown,
iconEnabledColor: Colors.indigo,
isExpanded: true,
),
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Multi select 3 dialog
SearchableDropdown.multiple(
items: items,
selectedItems: selectedItems,
hint: "Select 3 items",
searchHint: "Select 3",
validator: (selectedItemsForValidator) {
if (selectedItemsForValidator.length != 3) {
return ("Must select 3");
}
return (null);
},
onChanged: (value) {
setState(() {
selectedItems = value;
});
},
doneButton: (selectedItemsDone, doneContext) {
return (RaisedButton(
onPressed: selectedItemsDone.length != 3
? null
: () {
Navigator.pop(doneContext);
setState(() {});
},
child: Text("Save")));
},
closeButton: (selectedItems) {
return (selectedItems.length == 3 ? "Ok" : null);
},
isExpanded: true,
),
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Single menu
SearchableDropdown.single(
items: items,
value: selectedValue,
hint: "Select one",
searchHint: null,
onChanged: (value) {
setState(() {
selectedValue = value;
});
},
dialogBox: false,
isExpanded: true,
menuConstraints: BoxConstraints.tight(Size.fromHeight(350)),
),
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Multi menu
SearchableDropdown.multiple(
items: items,
selectedItems: selectedItems,
hint: "Select any",
searchHint: "",
doneButton: "Close",
closeButton: SizedBox.shrink(),
onChanged: (value) {
setState(() {
selectedItems = value;
});
},
dialogBox: false,
isExpanded: true,
menuConstraints: BoxConstraints.tight(Size.fromHeight(350)),
),
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Multi menu select all/none
SearchableDropdown.multiple(
items: items,
selectedItems: selectedItems,
hint: "Select any",
searchHint: "Select any",
onChanged: (value) {
setState(() {
selectedItems = value;
});
},
dialogBox: false,
closeButton: (selectedItemsClose) {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
RaisedButton(
onPressed: () {
setState(() {
selectedItems.clear();
selectedItems.addAll(
Iterable<int>.generate(items.length).toList());
});
},
child: Text("Select all")),
RaisedButton(
onPressed: () {
setState(() {
selectedItems.clear();
});
},
child: Text("Select none")),
],
);
},
isExpanded: true,
menuConstraints: BoxConstraints.tight(Size.fromHeight(350)),
),
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Multi dialog select all/none without clear
SearchableDropdown.multiple(
items: items,
selectedItems: selectedItems,
hint: "Select any",
searchHint: "Select any",
displayClearIcon: false,
onChanged: (value) {
setState(() {
selectedItems = value;
});
},
dialogBox: true,
closeButton: (selectedItemsClose) {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
RaisedButton(
onPressed: () {
setState(() {
selectedItems.clear();
selectedItems.addAll(
Iterable<int>.generate(items.length).toList());
});
},
child: Text("Select all")),
RaisedButton(
onPressed: () {
setState(() {
selectedItems.clear();
});
},
child: Text("Select none")),
],
);
},
isExpanded: true,
),
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Single dialog custom keyboard
SearchableDropdown.single(
items: Iterable<int>.generate(20).toList().map((i) {
return (DropdownMenuItem(
child: Text(i.toString()),
value: i.toString(),
));
}).toList(),
value: selectedValue,
hint: "Select one number",
searchHint: "Select one number",
onChanged: (value) {
setState(() {
selectedValue = value;
});
},
dialogBox: true,
keyboardType: TextInputType.number,
isExpanded: true,
),
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Single dialog object
SearchableDropdown.single(
items: ExampleNumber.list.map((exNum) {
return (DropdownMenuItem(
child: Text(exNum.numberString), value: exNum));
}).toList(),
value: selectedNumber,
hint: "Select one number",
searchHint: "Select one number",
onChanged: (value) {
setState(() {
selectedNumber = value;
});
},
dialogBox: true,
isExpanded: true,
),
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Single dialog overflow
SearchableDropdown.single(
items: [
DropdownMenuItem(
child: Text(
"way too long text for a smartphone at least one that goes in a normal sized pair of trousers but maybe not for a gigantic screen like there is one at my cousin's home in a very remote country where I
wouldn't want to go right now"),
value:
"way too long text for a smartphone at least one that goes in a normal sized pair of trousers but maybe not for a gigantic screen like there is one at my cousin's home in a very remote country where I
wouldn't want to go right now",
)
],
value: "",
hint: "Select one",
searchHint: "Select one",
onChanged: (value) {
setState(() {
selectedValue = value;
});
},
dialogBox: true,
isExpanded: true,
),
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Single dialog readOnly
SearchableDropdown.single(
items: [
DropdownMenuItem(
child: Text(
"one item"),
value:
"one item",
)
],
value: "one item",
hint: "Select one",
searchHint: "Select one",
disabledHint: "Disabled",
onChanged: (value) {
setState(() {
selectedValue = value;
});
},
dialogBox: true,
isExpanded: true,
readOnly: true,
),
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Single dialog disabled
SearchableDropdown.single(
items: [
DropdownMenuItem(
child: Text(
"one item"),
value:
"one item",
)
],
value: "one item",
hint: "Select one",
searchHint: "Select one",
disabledHint: "Disabled",
onChanged: null,
dialogBox: true,
isExpanded: true,
),
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Feature requests/comments/questions/bugs #
Feel free to log your feature requests/comments/questions/bugs here:
https://github.com/icemanbsi/searchable_dropdown/issues
Contributions #
We would be happy to merge pull request proposals provided that:

they don't break the compilation
they pass the automated testing
they provide the relevant adaptations to documentation and automated testing
they bring value
they don't completely transform the code
they are readable (though, I enjoy https://www.ioccc.org/ as a contest full of curiosities)

Contributions and forks are very welcome!
In your pull request, feel free to add your line in the contributors section below:
Contributors #

https://github.com/icemanbsi
https://github.com/lcuis
https://github.com/chandrabezzo

CI/CD #
Continuous integration/deployment status: