### Simple Dropdown Example

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Demonstrates a basic dropdown with a list of strings. The `initialItem` is set to the first element of the list. The `onChanged` callback logs the selected value.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
import 'package:flutter/material.dart';
import 'dart:developer';

const List<String> _list = [
    'Developer',
    'Designer',
    'Consultant',
    'Student',
  ];

class SimpleDropdown extends StatelessWidget {
  const SimpleDropdown({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return CustomDropdown<String>(
      hintText: 'Select job role',
      items: _list,
      initialItem: _list[0],
      onChanged: (value) {
        log('changing value to: $value');
      },
    );
  }
}
```

--------------------------------

### Multi-Select Dropdown Example

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Implements a dropdown that allows multiple selections. `initialItems` is used to pre-select items. The `onListChanged` callback receives the list of selected items.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
import 'package:flutter/material.dart';
import 'dart:developer';

const List<Job> _list = [
    Job('Developer', Icons.developer_mode),
    Job('Designer', Icons.design_services),
    Job('Consultant', Icons.account_balance),
    Job('Student', Icons.school),
  ];

class MultiSelectDropDown extends StatelessWidget {
  const MultiSelectDropDown({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return CustomDropdown<Job>.multiSelect(
        items: _jobItems,
        initialItems: _jobItems.take(1).toList(),
        onListChanged: (value) {
          log('changing value to: $value');
        },
      );
  }
}
```

--------------------------------

### Add Dependency to pubspec.yaml

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Add the latest version of the package to your pubspec.yaml file and run flutter pub get.

```dart
dependencies:
  animated_custom_dropdown: 3.1.1
```

--------------------------------

### Initialize Service Worker and Load Main Dart JS

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/example/web/index.html

This script handles service worker registration and loading the main Dart JS file. It includes logic for waiting for service worker activation, updating to new versions, and falling back to a plain script tag if the service worker fails to load.

```javascript
var serviceWorkerVersion = null;
var scriptLoaded = false;

function loadMainDartJs() {
  if (scriptLoaded) {
    return;
  }
  scriptLoaded = true;
  var scriptTag = document.createElement('script');
  scriptTag.src = 'main.dart.js';
  scriptTag.type = 'application/javascript';
  document.body.append(scriptTag);
}

if ('serviceWorker' in navigator) {
  // Service workers are supported. Use them.
  window.addEventListener('load', function () {
    // Wait for registration to finish before dropping the <script> tag.
    // Otherwise, the browser will load the script multiple times,
    // potentially different versions.
    var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
    navigator.serviceWorker.register(serviceWorkerUrl)
      .then((reg) => {
        function waitForActivation(serviceWorker) {
          serviceWorker.addEventListener('statechange', () => {
            if (serviceWorker.state == 'activated') {
              console.log('Installed new service worker.');
              loadMainDartJs();
            }
          });
        }

        if (!reg.active && (reg.installing || reg.waiting)) {
          // No active web worker and we have installed or are installing
          // one for the first time. Simply wait for it to activate.
          waitForActivation(reg.installing || reg.waiting);
        } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
          // When the app updates the serviceWorkerVersion changes, so we
          // need to ask the service worker to update.
          console.log('New service worker available.');
          reg.update();
          waitForActivation(reg.installing);
        } else {
          // Existing service worker is still good.
          console.log('Loading app from service worker.');
          loadMainDartJs();
        }
      });

    // If service worker doesn't succeed in a reasonable amount of time,
    // fallback to plaint <script> tag.
    setTimeout(() => {
      if (!scriptLoaded) {
        console.warn(
          'Failed to load app from service worker. Falling back to plain <script> tag.',
        );
        loadMainDartJs();
      }
    }, 4000);
  });
} else {
  // Service workers not supported. Just drop the <script> tag.
  loadMainDartJs();
}
```

--------------------------------

### Create a Searchable Dropdown

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Implement a single-select dropdown with a search bar for filtering items. Use the `CustomDropdown<T>.search` constructor for this purpose. Ensure the `Job` model implements `CustomDropdownListFilter` for filtering to work.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
import 'package:flutter/material.dart';
import 'dart:developer';

const List<Job> _list = [
    Job('Developer', Icons.developer_mode),
    Job('Designer', Icons.design_services),
    Job('Consultant', Icons.account_balance),
    Job('Student', Icons.school),
  ];

class SearchDropdown extends StatelessWidget {
  const SearchDropdown({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return CustomDropdown<Job>.search(
      hintText: 'Select job role',
      items: _list,
      excludeSelected: false,
      onChanged: (value) {
        log('changing value to: $value');
      },
    );
  }
}
```

--------------------------------

### Create a Multi-Select Searchable Dropdown

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Implement a multi-select dropdown with a search bar for filtering items. Use the `CustomDropdown<T>.multiSelectSearch` constructor. This allows users to select multiple options from a searchable list.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
import 'package:flutter/material.dart';
import 'dart:developer';

const List<Job> _list = [
    Job('Developer', Icons.developer_mode),
    Job('Designer', Icons.design_services),
    Job('Consultant', Icons.account_balance),
    Job('Student', Icons.school),
  ];

class MultiSelectSearchDropdown extends StatelessWidget {
  const MultiSelectSearchDropdown({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return CustomDropdown<Job>.multiSelectSearch(
      hintText: 'Select job role',
      items: _list,
      onListChanged: (value) {
        log('changing value to: $value');
      },
    );
  }
}
```

--------------------------------

### Create a Search Dropdown with Asynchronous Data Request

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Implement a single-select dropdown that fetches data asynchronously based on user search queries. Use the `CustomDropdown<T>.searchRequest` constructor and provide a `futureRequest` callback. This is ideal for loading data from APIs.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
import 'package:flutter/material.dart';
import 'dart:developer';

const List<Pair> _list = [
    Pair('Developer', Icons.developer_board),
    Pair('Designer', Icons.deblur_sharp),
    Pair('Consultant', Icons.money_off),
    Pair('Student', Icons.edit),
  ];

class SearchRequestDropdown extends StatelessWidget {
  const SearchRequestDropdown({Key? key}) : super(key: key);

  // This should be a call to the api or service or similar
  Future<List<Pair>> _getFakeRequestData(String query) async {
    return await Future.delayed(const Duration(seconds: 1), () {
      return _list.where((e) {
        return e.text.toLowerCase().contains(query.toLowerCase());
      }).toList();
    });
  }

  @override
  Widget build(BuildContext context) {
    return CustomDropdown<Pair>.searchRequest(
      futureRequest: _getFakeRequestData,
      hintText: 'Search job role',
      items: _list,
      onChanged: (value) {
        log('changing value to: $value');
      },
    );
  }
}
```

--------------------------------

### Import the Package

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Import the custom_dropdown package into your Dart file to use its widgets.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
```

--------------------------------

### Create a Multi-Select Search Dropdown with Asynchronous Data Request

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Implement a multi-select dropdown that fetches data asynchronously based on user search queries. Use the `CustomDropdown<T>.multiSelectSearchRequest` constructor. This allows users to select multiple items from a dynamically loaded list.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
import 'package:flutter/material.dart';
import 'dart:developer';

const List<Pair> _list = [
    Pair('Developer', Icons.developer_board),
    Pair('Designer', Icons.deblur_sharp),
    Pair('Consultant', Icons.money_off),
    Pair('Student', Icons.edit),
  ];

class MultiSelectSearchRequestDropdown extends StatelessWidget {
  const MultiSelectSearchRequestDropdown({Key? key}) : super(key: key);

  // This should be a call to the api or service or similar
  Future<List<Pair>> _getFakeRequestData(String query) async {
    return await Future.delayed(const Duration(seconds: 1), () {
      return _list.where((e) {
        return e.text.toLowerCase().contains(query.toLowerCase());
      }).toList();
    });
  }

  @override
  Widget build(BuildContext context) {
    return CustomDropdown<Pair>.multiSelectSearchRequest(
      futureRequest: _getFakeRequestData,
      hintText: 'Search job role',
      onListChanged: (value) {
        log('changing value to: $value');
      },
    );
  }
}
```

--------------------------------

### Define Custom Pair Model

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Define a simple data model 'Pair' with text and icon properties. This model will be used for dropdown items that require custom display logic.

```dart
class Pair {
  final String text;
  final IconData icon;
  const Pair(this.text, this.icon);

  @override
  String toString() {
    return text;
  }
}
```

--------------------------------

### Multi-Select Dropdown with Validation

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

This snippet demonstrates a multi-select dropdown with validation. It's suitable for scenarios where multiple selections are allowed and the selection must meet validation criteria.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
import 'package:flutter/material.dart';
import 'dart:developer';

const List<String> _list = [
    'Developer',
    'Designer',
    'Consultant',
    'Student',
  ];

class MultiSelectValidationDropdown extends StatelessWidget {
  MultiSelectValidationDropdown({Key? key}) : super(key: key);

  final _formKey = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    return Form(
      key: _formKey,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          CustomDropdown<String>.multiSelect(
            hintText: 'Select job role',
            items: _list,
            onListChanged: (value) {
              log('changing value to: $value');
            },
            listValidator: (value) => value.isEmpty ? "Must not be null" : null,
          ),
          const SizedBox(height: 16),
          SizedBox(
            width: double.infinity,
            child: ElevatedButton(
              onPressed: () {
                if (!_formKey.currentState!.validate()) return;
              },
              child: const Text(
                'Submit',
                style: TextStyle(fontWeight: FontWeight.w600),
              ),
            ),
          ),
        ],
      ),
    );
  }
}
```

--------------------------------

### Dropdown with Custom Type Model

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Uses a custom `Job` model for dropdown items. The `toString()` method of the `Job` class is crucial for displaying item names correctly. The `onChanged` callback logs the selected `Job` object.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
import 'package:flutter/material.dart';
import 'dart:developer';

const List<Job> _list = [
    Job('Developer', Icons.developer_mode),
    Job('Designer', Icons.design_services),
    Job('Consultant', Icons.account_balance),
    Job('Student', Icons.school),
  ];

class SimpleDropdown extends StatelessWidget {
  const SimpleDropdown({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return CustomDropdown<Job>(
      hintText: 'Select job role',
      items: _list,
      onChanged: (value) {
        log('changing value to: $value');
      },
    );
  }
}
```

--------------------------------

### Custom Type Model for Dropdown

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Defines a custom `Job` class for dropdown items. Ensure the `toString()` method is overridden to display the desired property, preventing 'Instance of [model name]' output.

```dart
class Job {
  final String name;
  final IconData icon;
  const Job(this.name, this.icon);

  @override
  String toString() {
    return name;
  }
}
```

--------------------------------

### Single Select Dropdown with Validation

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

This snippet shows how to implement a single select dropdown with validation using the CustomDropdown widget. It's useful when a single selection is required and must be validated.

```dart
import 'package:animated_custom_dropdown/custom_dropdown.dart';
import 'package:flutter/material.dart';
import 'dart:developer';

const List<String> _list = [
    'Developer',
    'Designer',
    'Consultant',
    'Student',
  ];

class ValidationDropdown extends StatelessWidget {
  ValidationDropdown({Key? key}) : super(key: key);

  final _formKey = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    return Form(
      key: _formKey,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          CustomDropdown<String>(
            hintText: 'Select job role',
            items: _list,
            onChanged: (value) {
              log('changing value to: $value');
            },
            // Run validation on item selected
            validateOnChange: true,
            // Function to validate if the current selected item is valid or not
            validator: (value) => value == null ? "Must not be null" : null,
          ),
          const SizedBox(height: 16),
          SizedBox(
            width: double.infinity,
            child: ElevatedButton(
              onPressed: () {
                if (!_formKey.currentState!.validate()) return;
              },
              child: const Text(
                'Submit',
                style: TextStyle(fontWeight: FontWeight.w600),
              ),
            ),
          ),
        ],
      ),
    );
  }
}
```

--------------------------------

### Define Custom Job Model with Filtering

Source: https://github.com/abdullahchauhan/custom-dropdown/blob/master/README.md

Enhance a data model with the CustomDropdownListFilter mixin to enable item filtering within the dropdown. This is useful for dynamic filtering based on user input.

```dart
class Job with CustomDropdownListFilter {
  final String name;
  final IconData icon;
  const Job(this.name, this.icon);

  @override
  String toString() {
    return name;
  }

  @override
  bool filter(String query) {
    return name.toLowerCase().contains(query.toLowerCase());
  }
}
```

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