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Description:

searchfield

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A highly customizable, simple and easy to use searchfield widget. This Widget allows you to search and select a suggestion from list of suggestions. Think of this widget like a dropdownButton field with the following capabilities

search 🔍 from a list of suggestions.
validate the input with custom validation logic.
Dynamic height of each suggestion item.
show suggestions of custom type (not just String)
lazy load the suggestions from Network with custom Loading widget
show dynamic suggestions above or below the input field
define max number of items visible in the viewport 📱
filter out the suggestions with a custom logic
visually customize the input and the suggestions
navigate through the suggestions using keyboard
Listen to scroll events of suggestions

Getting Started #
Installation #

Add the dependency

flutter pub add searchfield
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Import the package

import 'package:searchfield/searchfield.dart';
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Use the Widget
Example1
SearchField<Country>(
suggestions: countries
.map(
(e) => SearchFieldListItem<Country>(
e.name,
item: e,
// Use child to show Custom Widgets in the suggestions
// defaults to Text widget
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
CircleAvatar(
backgroundImage: NetworkImage(e.flag),
),
SizedBox(
width: 10,
),
Text(e.name),
],
),
),
),
).toList(),
),
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Example 2 (Network demo)
Ability to load suggestions from the network with a custom loading widget
SearchField(
onSearchTextChanged: (query) {
final filter = suggestions
.where((element) =>
element.toLowerCase().contains(query.toLowerCase()))
.toList();
return filter
.map((e) =>
SearchFieldListItem<String>(e, child: searchChild(e)))
.toList();
},
onTap: () async {
final result = await getSuggestions();
setState(() {
suggestions = result;
});
},
/// widget to show when suggestions are empty
emptyWidget: Container(
decoration: suggestionDecoration,
height: 200,
child: const Center(
child: CircularProgressIndicator(
color: Colors.white,
))),
hint: 'Load suggestions from network',
itemHeight: 50,
scrollbarDecoration: ScrollbarDecoration(),
suggestionStyle: const TextStyle(fontSize: 24, color: Colors.white),
searchInputDecoration: InputDecoration(...),
border: OutlineInputBorder(...)
fillColor: Colors.white,
filled: true,
contentPadding: const EdgeInsets.symmetric(
horizontal: 20,
),
),
suggestionsDecoration: suggestionDecoration,
suggestions: suggestions
.map((e) => SearchFieldListItem<String>(e, child: searchChild(e)))
.toList(),
focusNode: focus,
suggestionState: Suggestion.expand,
onSuggestionTap: (SearchFieldListItem<String> x) {
focus.unfocus();
},
),
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Example 3 Custom Widgets
complete code here

Example 4 Load suggestions from network with Pagination
Note that this also maintains the Scroll position when new items are added to list
see: complete code here

Example 5 (Validation)
Form(
key: _formKey,
child: SearchField(
suggestions: _statesOfIndia
.map((e) => SearchFieldListItem(e))
.toList(),
suggestionState: Suggestion.expand,
textInputAction: TextInputAction.next,
hint: 'SearchField Example 2',
searchStyle: TextStyle(
fontSize: 18,
color: Colors.black.withOpacity(0.8),
),
validator: (x) {
if (!_statesOfIndia.contains(x) || x!.isEmpty) {
return 'Please Enter a valid State';
}
return null;
},
searchInputDecoration: InputDecoration(
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(
color: Colors.black.withOpacity(0.8),
),
),
border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.red),
),
),
maxSuggestionsInViewPort: 6,
itemHeight: 50,
onTap: (x) {},
))
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SearchField(
onSearchTextChanged: (query) {
final filter = suggestions
.where((element) =>
element.toLowerCase().contains(query.toLowerCase()))
.toList();
return filter
.map((e) => SearchFieldListItem<String>(e,
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 4.0),
child: Text(e,
style: TextStyle(fontSize: 24, color: Colors.red)),
)))
.toList();
},
key: const Key('searchfield'),
hint: 'Search by country name',
itemHeight: 50,
searchInputDecoration:
InputDecoration(hintStyle: TextStyle(color: Colors.red)),
suggestionsDecoration: SuggestionDecoration(
padding: const EdgeInsets.all(4),
border: Border.all(color: Colors.red),
borderRadius: BorderRadius.all(Radius.circular(10))),
suggestions: suggestions
.map((e) => SearchFieldListItem<String>(e,
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 4.0),
child: Text(e,
style: TextStyle(fontSize: 24, color: Colors.red)),
)))
.toList(),
focusNode: focus,
suggestionState: Suggestion.expand,
onSuggestionTap: (SearchFieldListItem<String> x) {
focus.unfocus();
},
),
));
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Customize the suggestions the way you want #
Suggestions can be passed as a widget using the child property of SearchFieldListItem
SearchField(
suggestions: _statesOfIndia
.map((e) => SearchFieldListItem(e,
child: Align(
alignment: Alignment.centerRight,
child: Padding(
padding: const EdgeInsets.symmetric(horizontal:16.0),
child: Text(e,
style: TextStyle(color: Colors.red),
),
),
))).toList(),
...
...
)
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Support for Keyboard Navigation #
With v0.9.5 Searchfield now adds support for Keyboard navigation, you can now navigate through the suggestions using the keyboard.

Shortcuts:

Up/Down Arrow keys are circular, i.e. if you reach the last item and press down, it will take you to the first item. Similarly, if you reach the first item and press up, it will take you to the last item.
ctr/option + down to scroll to last item in the list
ctr/option + up to scroll to first item in the list

Support for Dynamic positioning of suggestions #
The position of suggestions is dynamic based on the space available for the suggestions to expand within the viewport.

Properties #

animationDuration: Duration for the animation of the suggestions list.
autoCorrect: Defines whether to enable autoCorrect defaults to true
autofocus: Defines whether to enable autofocus defaults to false
autoValidateMode: Used to enable/disable this form field auto validation and update its error text.defaults to AutoValidateMode.disabled
controller: TextEditing Controller to interact with the searchfield.
comparator property to filter out the suggestions with a custom logic (Comparator is deprecated Use onSearchTextChanged instead).
dynamicHeight: Set to true to opt-in to dynamic height, defaults to false (itemHeight : 51)
emptyWidget: Custom Widget to show when search returns empty Results or when showEmpty is true. (defaults to SizedBox.shrink)
enabled: Defines whether to enable the searchfield defaults to true
focusNode : FocusNode to interact with the searchfield.
hint : hint for the search Input.
readOnly : Defines whether to enable the searchfield defaults to false
initialValue : The initial value to be set in searchfield when its rendered, if not specified it will be empty.
inputType: Keyboard Type for SearchField
inputFormatters: Input Formatter for SearchField
itemHeight : height of each suggestion Item, (defaults to 51.0).
marginColor : Color for the margin between the suggestions.
maxSuggestionBoxHeight: Specifies a maximum height for the suggestion box when dynamicHeight is set to true.
maxSuggestionsInViewPort : The max number of suggestions that can be shown in a viewport.
offset : suggestion List offset from the searchfield, The top left corner of the searchfield is the origin (0,0).
onOutSideTap : callback when the user taps outside the searchfield.
onSaved : An optional method to call with the final value when the form is saved via FormState.save.
onScroll : callback when the suggestion list is scrolled. It returns the current scroll position in pixels and the max scroll position.
onSearchTextChanged: callback when the searchfield text changes, it returns the current text in the searchfield.
onSuggestionTap : callback when a sugestion is tapped it also returns the tapped value.
onSubmit : callback when the searchfield is submitted, it returns the current text in the searchfield.
onTap: callback when the searchfield is tapped or brought into focus.
scrollbarDecoration: decoration for the scrollbar.
showEmpty: Boolean to show/hide the emptyWidget.
suggestions(required) : List of SearchFieldListItem to search from.
each SearchFieldListItem in the list requires a unique searchKey, which is used to search the list and an optional Widget, Custom Object to display custom widget and to associate a object with the suggestion list.
suggestionState: enum to hide/show the suggestion on focusing the searchfield defaults to SuggestionState.expand.
searchStyle : textStyle for the search Input.
searchInputDecoration : decoration for the search Input (e.g to update HintStyle) similar to built in textfield widget.
suggestionsDecoration : decoration for suggestions List with ability to add box shadow background color and much more.
suggestionDirection : direction of the suggestions list, defaults to SuggestionDirection.down.
suggestionItemDecoration : decoration for suggestionItem with ability to add color and gradient in the background.
SuggestionAction : enum to control focus of the searchfield on suggestion tap.
suggestionStyle:Specifies TextStyle for suggestions when no child is provided.
textInputAction : An action the user has requested the text input control to perform throgh the submit button on keyboard.
textCapitalization : Configures how the platform keyboard will select an uppercase or lowercase keyboard on IOS and Android.
textAlign: specifies the alignment of the text in the searchfield. Defaults to TextAlign.start.

You can find all the code samples here #
Contributing #
You are welcome to contribute to this package, to contribute please read the contributing guidelines.
Contributors #
Thanks to all the contributors who have helped in improving this package.