How to Cache Data in PHP
30th May 2023Mojo: The Programming Language for AI That Is Up To 35000x Faster Than Python
3rd June 2023Flutter for web, This page covers the following steps for getting started with web support:
- Configure the
flutter
tool for web support. - Create a new project with web support.
- Run a new project with web support.
- Build an app with web support.
- Add web support to an existing project.
Flutter for web, Requirements
To create a Flutter app with web support, you need the following software:
- Flutter SDK. See the Flutter SDK installation instructions.
- Chrome; debugging a web app requires the Chrome browser.
- Optional: An IDE that supports Flutter. You can install Visual Studio Code, Android Studio, IntelliJ IDEA. Also install the Flutter and Dart plugins to enable language support and tools for refactoring, running, debugging, and reloading your web app within an editor. See setting up an editor for more details.
For more information, see the web FAQ.
Create a new project with web support
You can use the following steps to create a new project with web support.
Set up
Run the following commands to use the latest version of the Flutter SDK:content_copy
$ flutter channel stable
$ flutter upgrade
Warning: Running flutter channel stable
replaces your current version of Flutter with the stable version and can take time if your connection is slow. After this, running flutter upgrade
upgrades your install to the latest stable
. Returning to another channel (beta or master) requires calling flutter channel <channel>
explicitly.
If Chrome is installed, the flutter devices
command outputs a Chrome
device that opens the Chrome browser with your app running, and a Web Server
that provides the URL serving the app.content_copy
$ flutter devices
1 connected device:
Chrome (web) • chrome • web-javascript • Google Chrome 88.0.4324.150
In your IDE, you should see Chrome (web) in the device pulldown.
Create and run
Creating a new project with web support is no different than creating a new Flutter project for other platforms.
IDE
Create a new app in your IDE and it automatically creates iOS, Android, desktop, and web versions of your app. From the device pulldown, select Chrome (web) and run your app to see it launch in Chrome.
Command line
To create a new app that includes web support (in addition to mobile support), run the following commands, substituting my_app
with the name of your project:content_copy
$ flutter create my_app
$ cd my_app
To serve your app from localhost
in Chrome, enter the following from the top of the package:content_copy
$ flutter run -d chrome
Note: If there aren’t any other connected devices, the -d chrome
is optional.
The flutter run
command launches the application using the development compiler in a Chrome browser.
Warning: Hot reload is not supported in a web browser Currently, Flutter supports hot restart, but not hot reload in a web browser.
Build
Run the following command to generate a release build:content_copy
$ flutter build web
A release build uses dart2js (instead of the development compiler) to produce a single JavaScript file main.dart.js
. You can create a release build using release mode (flutter run --release
) or by using flutter build web
. This populates a build/web
directory with built files, including an assets
directory, which need to be served together.
You can also include --web-renderer html
or --web-renderer canvaskit
to select between the HTML or CanvasKit renderers, respectively. For more information, see Web renderers.
For more information, see Build and release a web app.
Add web support to an existing app
To add web support to an existing project created using a previous version of Flutter, run the following command from your project’s top-level directory:content_copy
$ flutter create --platforms web .
What you’ll build
You’ll implement a simple web app that displays a sign in screen. The screen contains three text fields: first name, last name, and username. As the user fills out the fields, a progress bar animates along the top of the sign in area. When all three fields are filled in, the progress bar displays in green along the full width of the sign in area, and the Sign up button becomes enabled. Clicking the Sign up button causes a welcome screen to animate in from the bottom of the screen.
The animated GIF shows how the app works at the completion of this lab.
What you’ll learn
- How to write a Flutter app that looks natural on the web.
- Basic structure of a Flutter app.
- How to implement a Tween animation.
- How to implement a stateful widget.
- How to use the debugger to set breakpoints.
While developing, run your web app in Chrome so you can debug with Dart DevTools.
Step 0: Get the starter web app
You’ll start with a simple web app that we provide for you.
- Enable web development.
At the command line, perform the following command to make sure that you have Flutter installed correctly.content_copy$ flutter doctor Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel master, 3.4.0-19.0.pre.254, on macOS 12.6 21G115 darwin-arm64, locale en) [✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0) [✓] Xcode - develop for iOS and macOS (Xcode 14.0) [✓] Chrome - develop for the web [✓] Android Studio (version 2021.2) [✓] VS Code (version 1.71.1) [✓] Connected device (4 available) [✓] HTTP Host Availability • No issues found!
If you see “flutter: command not found”, then make sure that you have installed the Flutter SDK and that it’s in your path.It’s okay if the Android toolchain, Android Studio, and the Xcode tools aren’t installed, since the app is intended for the web only. If you later want this app to work on mobile, you’ll need to do additional installation and setup. - List the devices.
To ensure that web is installed, list the devices available. You should see something like the following:content_copy$ flutter devices 4 connected devices: sdk gphone64 arm64 (mobile) • emulator-5554 • android-arm64 • Android 13 (API 33) (emulator) iPhone 14 Pro Max (mobile) • 45A72BE1-2D4E-4202-9BB3-D6AE2601BEF8 • ios • com.apple.CoreSimulator.SimRuntime.iOS-16-0 (simulator) macOS (desktop) • macos • darwin-arm64 • macOS 12.6 21G115 darwin-arm64 Chrome (web) • chrome • web-javascript • Google Chrome 105.0.5195.125
The Chrome device automatically starts Chrome and enables the use of the Flutter DevTools tooling.
Observations
- The entire code for this example lives in the
lib/main.dart
file. - If you know Java, the Dart language should feel very familiar.
- All of the app’s UI is created in Dart code. For more information, see Introduction to declarative UI.
- The app’s UI adheres to Material Design, a visual design language that runs on any device or platform. You can customize the Material Design widgets, but if you prefer something else, Flutter also offers the Cupertino widget library, which implements the current iOS design language. Or you can create your own custom widget library.
- In Flutter, almost everything is a Widget. Even the app itself is a widget. The app’s UI can be described as a widget tree.
for more information XpertLab
similar Blogs Click