Flutter dropdown onChange implementation. In this post, I will be implementing Flutter dropdown onChange with a proper Flutter code example. I will be explaining everything about Flutter dropdown onChange step by step so you don’t have any queries left when you finish reading this post. So let’s not waste anymore time and start implementing Flutter dropdown onChange in Flutter dropdown button.
Outline
- What is Flutter Dropdown OnChange?
- Implementing Flutter Dropdown OnChange(All Steps)
- Custom Flutter Dropdown Button Design Source Code
- Conclusion
What is Flutter Dropdown OnChange?
Flutter dropdown onChange is used to select an option from the list of dropdown items and show it in the Flutter dropdown button. Don’t worry in the next section, I will implement Flutter dropdown onChange using an easy Flutter example so you can have a better idea.
Implementing Flutter Dropdown OnChange(All Steps)
To implement Flutter dropdown onChange, we have to use the on changed constructor of the Flutter dropdown button widget. See the below code:
Step 1
DropdownMenuItem( value: 'Sports', child: Text('Sports', style: TextStyle(fontSize: 15, color: Colors.black45))),
The value constructor of the drop down menu item is like an id of that item. This is the value that is being fetched when we select any item from the dropdown list.
Step 2
String? categoryValue;
In step 1, we have to define a string variable so we can store the value of selected item in it.
Step 3
onChanged: (val) { setState(() { categoryValue = val.toString(); }); }
Step 4
value: categoryValue,
Now we have to pass the string variable to the value constructor. By using this, the selected value will be shown in the Flutter dropdown button.
Custom Flutter Dropdown Button Design Source Code
import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( debugShowCheckedModeBanner: false, home: Homepage(), ); } } class Homepage extends StatefulWidget { @override State<Homepage> createState() => _HomepageState(); } class _HomepageState extends State<Homepage> { String? categoryValue; @override Widget build(BuildContext context) { return SafeArea( child: Scaffold( body: Center( child: Padding( padding: EdgeInsets.all(20), child: Container( padding: EdgeInsets.symmetric(horizontal: 20, vertical: 5), decoration: BoxDecoration( borderRadius: BorderRadius.circular(50).copyWith( bottomRight: Radius.circular(0), topLeft: Radius.circular(0)), color: Colors.green.shade100), child: DropdownButtonHideUnderline( child: DropdownButton( iconSize: 30, borderRadius: BorderRadius.circular(20) .copyWith(topLeft: Radius.circular(0)), isExpanded: true, hint: Text('Select any item', style: TextStyle(fontSize: 15)), value: categoryValue, items: [ DropdownMenuItem( value: 'Sports', child: Text('Sports', style: TextStyle(fontSize: 15, color: Colors.black45))), DropdownMenuItem( value: 'Tech', child: Text('Tech', style: TextStyle(fontSize: 15, color: Colors.black45))), ], onChanged: (val) { setState(() { categoryValue = val.toString(); }); }), ), ), )))); } }
Conclusion
In conclusion, now you have a practical understanding of how Flutter dropdown onChange works. I would love to hear your feedback regarding this post. I would also want you to visit my other posts on Flutter app development, Flutter widgets and many more. That’s all for this post. Thanks for reading.
Flutter app articles you might like to read: beautiful gradient login UI, Dart Vs JavaScript, flutter login UI form, flutter basics for beginners, explanation of widgets in flutter, flutter architecture, flutter vs native, flutter sliverappbar customization, mobile app marketing tips, flutter bottom navigation bar, flutter appbar actions, flutter appbar title center, why learn react native framework, react native jobs, react native elements, unique flutter development.
You might also like:
Acer Chromebook Spin 314 Convertible Laptop Amazing Specs
Acer Aspire 5 a515 Laptop Amazing Specs
How To Change Flutter Dropdown Border Radius
How To Change Flutter Dropdown Icon Size
Amazing Specs Of Galaxy Chromebook Mercury Gray Laptop
Samsung Galaxy Book Pro Laptop Amazing Specs
How To Implement Flutter ListView Builder Horizontal
How To Implement Flutter ListView Horizontal
Asus Chromebook Flip C433 Laptop Amazing Specs
How To Change Flutter Textformfield Border Color?
How To Customize Flutter Textfield Initial Value?
ASUS Chromebook Detachable CM3 Amazing Specs
Amazing Acer Travelmate P4 laptop You Should Use
How To Change Flutter Textfield Hint Text Color?
How To Customize Flutter Textfield Initial Value?
How To Customize Flutter Textfield Hint Text?
How To Customize Flutter Textfield Label?
How To Implement Flutter Textfield Disable?
How To Change Flutter Textfield Height?
How To Change Flutter Textformfield Color?
How To Set Flutter Textformfield Default Value?
How To Change Flutter Textformfield Background Color
How To Change Flutter Textfield Underline Color
Flutter Textfield Remove Underline Explained With Example
Amazing Asus Rog Strix Scar 15 Gaming Laptop 2022
Beautiful Flutter Login UI Form Template With Free Source Code
Amazing Flutter Dart Book-Full Stack Application Development For Cloud(1st Edition)
Amazing Dart Programming Language Book For Beginners(1st Edition)
Best Python Programming Guide-Beginners Guide To Learn Python In 7 Days
Best Programming Python Book For Developers(2nd Edition)
Best Python Book Guide For Developers(3rd Edition)
Best Python Programming Exercises Book From Beginner To Advanced(5th Edition)
Best Python Crash Course Book(2nd Edition)-Project Based Introduction To Programming
Best JavaScript and JQuery Book For Frontend Web Developers
Best React Native Book-Start Developing Hybrid Apps
Flutter Textfield Onchanged Explained With Example-Best Flutter Guide
Flutter Textfield Maxlength Detailed Explanation With Example-Best Flutter