Nilen Patel Inc.

Tutorial and code of Textfield Search in Flutter. Copy and paste the below code as per your requirements.

textfield_search: ^0.9.2

import 'package:flutter/material.dart';
import 'package:textfield_search/textfield_search.dart';
import 'dart:async';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Textfield Search',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Textfield Search'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, this.title = 'Textfield Search'}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final _testList = [
    'Test Item 1',
    'Test Item 2',
    'Test Item 3',
    'Test Item 4',
  ];

  TextEditingController myController = TextEditingController();
  TextEditingController myController2 = TextEditingController();
  TextEditingController myController3 = TextEditingController();

  @override
  void initState() {
    super.initState();
    myController.addListener(_printLatestValue);
    myController2.addListener(_printLatestValue);
    myController3.addListener(_printLatestValue);
  }

  _printLatestValue() {
    print("text field: ${myController.text}");
    print("text field: ${myController2.text}");
    print("text field: ${myController3.text}");
  }

  @override
  void dispose() {
    myController.dispose();
    myController2.dispose();
    myController3.dispose();
    super.dispose();
  }

  Future<List> fetchSimpleData() async {
    await Future.delayed(const Duration(milliseconds: 2000));
    List _list = <dynamic>[];
    _list.add('Text' + ' Item 1');
    _list.add('Test' + ' Item 2');
    _list.add('Test' + ' Item 3');
    return _list;
  }
  Future<List> fetchComplexData() async {
    await Future.delayed(const Duration(milliseconds: 1000));
    List _list = <dynamic>[];
    List _jsonList = [
      {'label': 'Text' + ' Item 1', 'value': 30},
      {'label': 'Text' + ' Item 2', 'value': 31},
      {'label': 'Text' + ' Item 3', 'value': 32},
    ];
    _list.add(TestItem.fromJson(_jsonList[0]));
    _list.add(TestItem.fromJson(_jsonList[1]));
    _list.add(TestItem.fromJson(_jsonList[2]));

    return _list;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Center(child: Text(widget.title),),
      ),
      body: Padding(
        padding: const EdgeInsets.all(20),
        child: Form(
          child: ListView(
            children: <Widget>[
              const SizedBox(height: 16),
              TextFieldSearch(
                  label: 'Simple Future List',
                  controller: myController2,
                  future: () {
                    return fetchSimpleData();
                  }),
              const SizedBox(height: 16),
              TextFieldSearch(
                label: 'Complex Future List',
                controller: myController3,
                future: () {
                  return fetchComplexData();
                },
                getSelectedValue: (item) {
                  print(item);
                },
                minStringLength: 5,
                textStyle: const TextStyle(color: Colors.red),
                decoration: const InputDecoration(hintText: 'Search For Something'),
              ),
              const SizedBox(height: 16),
              TextFieldSearch(
                  initialList: _testList,
                  label: 'Simple List',
                  controller: myController),
              const SizedBox(height: 16),
              TextFormField(
                decoration: const InputDecoration(labelText: 'Description'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}
class TestItem {
  final String label;
  dynamic value;

  TestItem({required this.label, this.value});

  factory TestItem.fromJson(Map<String, dynamic> json) {
    return TestItem(label: json['label'], value: json['value']);
  }
}