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Jaspr
:Dart Web Framework
Incheon / Songdo
박제창
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박제창
Flutter Seoul
GDG Golang Korea
Incheon / Songdo
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Dart Web
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@import
url('https://fonts.googleapis.com/css2?family=Roboto&display=swap');
html, body {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
font-family: 'Roboto', sans-serif;
}
#output {
padding: 20px;
text-align: left;
}
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dart:html
dart:indexed_db
dart:js
dart:js_util
dart:svg
dart:web_audio
dart:web_gl
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dart:html
dart:indexed_db
dart:js
dart:js_util
dart:svg
dart:web_audio
dart:web_gl
🪦
in 2025, the following dart:
libraries will be deprecated
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package : web
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import 'package:web/web.dart' as web;
final element = web.document.querySelector('#output') as
web.HTMLDivElement;
for (final item in thingsTodo()) {
element.appendChild(newLI(item));
}
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Progressive Web Apps
Single Page Apps
Existing Flutter mobile apps
Flutter Web
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SEO (Search Engine Optimization)
Renderer (CanvasKit & HTML)
Refresh / Update
Flutter Web
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Text Input & Text Field
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2024 Flutter Roadmap
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Web platform
We'll continue to focus on performance and quality, including investigating
reducing the overall application size, better use of multi-threading, supporting
platform views, improving app load times, making CanvasKit the default renderer,
improving text input, and investigating options for supporting SEO for Flutter web.
We expect to complete the effort to compile Dart to WasmGC, and with that
support Wasm compilation of Flutter web apps. This also includes a new JS interop
mechanism for Dart that supports both JS and Wasm compilation.
We also plan to resume work to support hot reload on the web.
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Incheon / Songdo
We'll continue to focus on
performance and quality,
including …
investigating options for
supporting SEO for Flutter
web.
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SEO
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👍 Admin & CMS
🤔 Blog & Articles (static websites)
Flutter Web
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Web Renderer
CanvasKit
Skia + WebAssembly
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CJK
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flutter run -d chrome --web-renderer html
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Web Renderer
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Web Renderer
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Web Renderer
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flutter run -d chrome --wasm
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How?
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@Kilian Schulte
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1.Open Source
2.Documentation
3.Playground
4.CLI Tool
5.Examples
6.Test
Jaspr
Jaspr is an modern web
framework for building
websites in Dart with
support for both
client-side and
server-side rendering.
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Directories
● /apps: Production apps built with jaspr
○ /jaspr_pad: Online Editor and Playground inspired by DartPad, built with jaspr.
● /docs: Documentation hosted at docs.page/schultek/jaspr
● /examples: Well-maintained and documented examples
● /packages:
○ /jaspr: The core framework package.
○ /jaspr_builder: Code-generation builders for jaspr.
○ /jaspr_cli: The command line interface of jaspr.
○ /jaspr_flutter_embed: Flutter element embedding bindings for jaspr.
○ /jaspr_lints: A collection of lints and assists for jaspr projects.
○ /jaspr_riverpod: Riverpod implementation for jaspr.
○ /jaspr_router: A router implementation for jaspr.
○ /jaspr_test: A testing package for jaspr.
○ /jaspr_tailwind: A tailwind integration for jaspr.
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Directories
● /apps: Production apps built with jaspr
○ /jaspr_pad: Online Editor and Playground inspired by DartPad, built with jaspr.
● /docs: Documentation hosted at docs.page/schultek/jaspr
● /examples: Well-maintained and documented examples
● /packages:
○ /jaspr: The core framework package.
○ /jaspr_builder: Code-generation builders for jaspr.
○ /jaspr_cli: The command line interface of jaspr.
○ /jaspr_flutter_embed: Flutter element embedding bindings for jaspr.
○ /jaspr_lints: A collection of lints and assists for jaspr projects.
○ /jaspr_riverpod: Riverpod implementation for jaspr.
○ /jaspr_router: A router implementation for jaspr.
○ /jaspr_test: A testing package for jaspr.
○ /jaspr_tailwind: A tailwind integration for jaspr.
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Differences to Flutter Web
Flutter Web is for building Web-Apps, not Web-Sites.
Jaspr is an alternative to Flutter Web, when you want to build any kind of website with Dart.
This includes (but is not limited to):
● Static Sites
● Server-Rendered Sites
● Single-Page Applications
Jaspr works by giving you the familiar look and feel of the Flutter framework, while using
native web technologies, like HTML, the DOM and CSS to enable you building all kinds of
websites using Dart.
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class Counter extends StatefulComponent {
const Counter({super.key});
@override
State createState() => CounterState();
}
class CounterState extends State {
int count = 0;
@override
Iterable build(BuildContext context) sync* {
yield div(classes: 'counter', [
Jaspr
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class MainApp extends StatelessWidget {
const MainApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: Scaffold(
body: Center(
child: Text('Hello World!'),
),
),
);
}
}
class Header extends StatelessComponent {
const Header({super.key});
@override
Iterable build(BuildContext context)
sync* {
yield header([
nav([
for (var route in [
(label: 'Home', path: '/'),
])
]),
]);
}
}
Flutter Jaspr
Differences to Flutter Web
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void main() {
runApp(const MainApp());
}
Flutter
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void main() {
runApp(const MainApp());
}
Flutter
MaterialApp
CupertinoApp
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void main() {
Jaspr.initializeApp(options: defaultJasprOptions);
runApp(Document(
title: "Flutter Plugin Interop",
head: [
link(rel: "stylesheet", href: "styles.css"),
],
body: App(),
));
}
Jaspr
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const factory Document({
String? title,
String? lang,
String? base,
String? charset,
String? viewport,
Map? meta,
List? styles,
List head,
required Component body,
}) = BaseDocument;
Jaspr
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Jaspr
My Site
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Jaspr - Installation
> dart pub global activate jaspr_cli
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Jaspr CLI
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Project (Jaspr comes with a cli tool to create, serve and build your website.)
● jaspr create: Create a new jaspr project.
● jaspr serve: Serve the project and automatically refresh when you make changes.
● jaspr build: Build the project according to the selected rendering mode.
Tooling (Additionally, there are the following service commands available)
● jaspr doctor: Show information about the environment and current project.
● jaspr clean: Delete the build/ and .dart_tool/ directories.
● jaspr update: Update the jaspr cli.
● jaspr analyze
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Jaspr Create
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> jaspr create my_website
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Jaspr Create
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1 Select a rendering mode:ely client-rendered site.
❯ ◉ static: Build a statically pre-rendered site.
◯ server: Build a server-rendered site.
◯ client: Build a purely client-rendered site.
Select a rendering mode:
2 (Recommended) Enable automatic hydration on the client? (Y/n)
3 Setup routing for different pages of your site? (Y/n)
4 (Recommended) Use multi-page (server-side) routing?
5 Setup Flutter web embedding? (y/N)
6 Enable support for using Flutter web plugins in your project? (Y/n)
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Jaspr Create
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1 Select a rendering mode:ely client-rendered site.
❯ ◉ static: Build a statically pre-rendered site.
◯ server: Build a server-rendered site.
◯ client: Build a purely client-rendered site.
Select a rendering mode: static: Build a statically pre-rendered site.
2 (Recommended) Enable automatic hydration on the client? (Y/n) Yes
3 Setup routing for different pages of your site? (Y/n) Yes
4 (Recommended) Use multi-page (server-side) routing? Yes
5 Setup Flutter web embedding? (y/N) No
6 Enable support for using Flutter web plugins in your project? (Y/n) Yes
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Static
Pre-rendering at
build time
Static
Site
No
server
Server
Pre-rendering
at request time
Dynamic
site
Server
Client
No pre-rendering
Single
page site
No
server
Jaspr Rendering Mode
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Jaspr Project Structure (Static)
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📦lib
┣ 📂components
┃ ┣ 📜counter.dart
┃ ┣ 📜header.dart
┃ ┗ 📜sample.dart
┣ 📂constants
┃ ┗ 📜theme.dart
┣ 📂pages
┃ ┣ 📜about.dart
┃ ┗ 📜home.dart
┣ 📜app.dart
┣ 📜jaspr_options.dart
┗ 📜main.dart
📦web
┣ 📂images
┃ ┗ 📜logo.png
┗ 📜favicon.ico
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Jaspr Project Structure (Client)
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📦lib
┣ 📂components
┃ ┣ 📜counter.dart
┃ ┗ 📜header.dart
┣ 📂pages
┃ ┣ 📜about.dart
┃ ┗ 📜home.dart
┗ 📜app.dart
📦web
┣ 📂images
┃ ┗ 📜logo.png
┣ 📜favicon.ico
┣ 📜index.html
┣ 📜main.dart
┗ 📜styles.css
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Jaspr Routing (jaspr_router)
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import 'package:jaspr_router/jaspr_router.dart';
import 'pages/home.dart';
import 'pages/about.dart' ;
class App extends StatelessComponent {
@override
Iterable build(BuildContext context) sync* {
yield Router(routes: [
Route(path: '/', builder: (context, state) => Home()),
Route(path: '/about', builder: (context, state) => About()),
]);
}
}
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📦pages
┣ 📂admin
┃ ┗ 📜admin.dart
┣ 📜about.dart
┣ 📜home.dart
┗ 📜profile.dart
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Jaspr Routing (jaspr_router)
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class App extends StatelessComponent {
@override
Iterable build(BuildContext context) sync* {
yield Router(routes: [
Route(path: '/', builder: (context, state) => Home()),
Route(path: '/about', builder: (context, state) => About()),
Route(path: "/profile", title: "Profile", builder: (context,state){
return Profile();
}),
Route(path: "/admin", title: "Admin", builder: (context,state){
return Admin();
})
]);
}
}
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Jaspr Component
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This is heading 1
- Coffee
- Tea
- Milk
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Jaspr Component
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This is heading 1
- Coffee
- Tea
- Milk
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Jaspr Component
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This is heading 1
- Coffee
- Tea
- Milk
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Jaspr Component
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@override
Iterable build(BuildContext context) sync* {
yield h1([text("This is heading 1")]);
yield ol([
li([text("Coffee")]),
li([text("Tea")]),
li([text("Milk")]),
]);
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Jaspr Component
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Component h1(List children,
{Key? key,
String? id,
String? classes,
Styles? styles,
Map? attributes,
Map? events}) {
return DomComponent(
tag: 'h1',
key: key,
id: id,
classes: classes,
styles: styles,
attributes: attributes,
events: events,
children: children,
);
}
Component
ProxyComponent
DomComponent
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Jaspr Styling
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Global Stylesheet
Inline Styles
Responsive styles
Third-Party CSS Frameworks
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div(styles: const Styles.background(color: Colors.red),
[]);
Jaspr Styling
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yield div(
styles: const Styles.background(color: Colors.red),
[text("Devfest 2024")]);
yield div(
styles: const Styles.raw({
'background-color': 'red',
}),
[text("Devfest 2024")]);
yield div(
styles:
const Styles.background(color: Colors.red)
.text(fontSize: 24.px),
[text("Devfest 2024")]);
yield div(
styles: Styles.combine([
Styles.background(color: Colors.red),
Styles.text(color: Colors.blue, fontSize: 23.px),
]),
[text("Devfest 2024")]);
Jaspr Styling
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const redText = Styles.text(color: Colors.red);
//Reusing Styles
const redBlueTest = Styles.combine([
redText,
Styles.background(color: Colors.blue),
]);
const redGreenTest = Styles.combine([
redText,
Styles.background(color: Colors.green),
]);
Jaspr Styling
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#content {
width: 100%;
height: 100%;
}
#content a {
color: green;
}
.red-text {
color: red;
}
Jaspr Styling
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Style(styles: [
css('#content', [
css('&').box(width: 100.percent, height: 100.percent),
css('a').text(color: Colors.green),
]),
css('.red-text').text(color: Colors.red),
]);
Jaspr Styling
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Style(styles: [
css('#content', [
css('&').box(width: 100.percent, height: 100.percent),
css('a').text(color: Colors.green),
]),
css('.red-text').text(color: Colors.red),
]);
Jaspr Styling #content {
width: 100%;
height: 100%;
}
#content a {
color: green;
}
.red-text {
color: red;
}
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Jaspr Styling
@override
Iterable build(BuildContext context) sync* {
yield div(classes: 'main', [
p([text('Hello World')]),
]);
}
@css
static final styles = [
css('.main', [
css('&').box(width: 100.px),
css('p').text(color: Colors.blue),
]),
];
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Jaspr Styling
@override
Iterable build(BuildContext context) sync* {
yield div(classes: 'main', [
p([text('Hello World')]),
]);
}
@css
static final styles = [
css('.main', [
css('&').box(width: 100.px),
css('p').text(color: Colors.blue),
]),
];
컴포넌트에서 정의되고 @css를
사용하여 등록된 스타일은 해당
컴포넌트에 범위가 지정되지 않습니다.
다른 컴포넌트에 원치 않는 영향을
주거나 스타일 정의가 충돌하는 것을
방지하려면
ID 또는 고유한 클래스 이름을 선택자로
사용해야 합니다
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@css
final styles = [
css('.main').flexbox(direction: FlexDirection.row),
css.media(MediaQuery.screen(maxWidth: 600.px), [
css('.main').flexbox(direction: FlexDirection.column)
]),
];
Jaspr Styling
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Jaspr Styling
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@RhysSullivan
Rapidly build modern websites without
ever leaving your HTML.
A utility-first CSS framework packed with classes
like flex, pt-4, text-center and rotate-90 that can
be composed to build any design, directly in your
markup.
“Tailwind CSS”
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Jaspr tailwindcss
> curl -sLO
https://github.com/tailwindlabs/tailwindcss/releases/latest/downloa
d/tailwindcss-macos-arm64
> chmod +x tailwindcss-macos-arm64
> mv tailwindcss-macos-arm64 /usr/local/bin/tailwindcss
Tailwind CSS Standalone CLI
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Jaspr tailwindcss
> curl -sLO
https://github.com/tailwindlabs/tailwindcss/releases/latest/downloa
d/tailwindcss-macos-arm64
> chmod +x tailwindcss-macos-arm64
> mv tailwindcss-macos-arm64 /usr/local/bin/tailwindcss
Tailwind CSS Standalone CLI
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Jaspr tailwindcss
dev_dependencies:
build_runner: ^2.4.0
jaspr_web_compilers: ^4.0.10+1
jaspr_builder: ^0.16.2
jaspr_lints: ^0.1.2
lints: ^3.0.0
jaspr_tailwind: ^0.3.0
pubspec.yaml
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Jaspr tailwindcss
styles.tw.css
📦web
┣ 📂images
┃ ┗ 📜logo.png
┣ 📜favicon.ico
┗ 📜styles.tw.css
@tailwind base;
@tailwind components;
@tailwind utilities;
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Jaspr tailwindcss
● BULMA
● daisyUI
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State Management
setState(() {
_counter++;
});
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State Management
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Jaspr State Management
class FabButtonComponent extends StatefulComponent {
State createState() => FabButtonComponentState();
}
class FabButtonComponentState extends State {
int count = 0;
int count1 = 0;
@override
Iterable build(BuildContext context) sync* {
// code
}
}
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yield div(
classes: "fixed bottom-4 right-4 flex flex-col items-center",
[
span(
classes: "mb-2 text-gray-700 text-sm",
[text("count: ${count.toString()}"),],),
span(
classes: "mb-2 text-gray-700 text-sm",
[text("count1: ${count1.toString()}"),],),
button(
classes:
"bg-blue-500 hover:bg-blue-600 text-white rounded-full p-4 shadow-lg",
[text("클릭 ${count}")],
onClick: () {
setState(() {
count += 1;
});
},
)],
);
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yield div(
classes: "fixed bottom-4 right-4 flex flex-col items-center",
[
span(
classes: "mb-2 text-gray-700 text-sm",
[text("count: ${count.toString()}"),],),
span(
classes: "mb-2 text-gray-700 text-sm",
[text("count1: ${count1.toString()}"),],),
button(
classes:
"bg-blue-500 hover:bg-blue-600 text-white rounded-full p-4 shadow-lg",
[text("클릭 ${count}")],
onClick: () {
setState(() {
count += 1;
});
},
)],
);
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Jaspr Riverpod
Jaspr comes with a Riverpod package that ports over flutter_riverpod
to Jaspr. It is based on Riverpod 2 and supports all providers and
modifiers.
● No Consumer / ConsumerComponent
● Just use context.read / context.watch
● Additional SyncProvider to sync values between server and client.
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Jaspr Riverpod
● context.read(),
● context.watch(),
● context.refresh(),
● context.invalidate(),
● context.listen()
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@client
class App extends StatelessComponent {
@override
Iterable build(BuildContext context) sync* {
yield ProviderScope(child: Counter());
}
}
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final count = context.watch(countProvider);
yield button([text("click2")],
onClick: (){
print("click");
context.read(countProvider.notifier).state = count + 1;
}
);
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final count = context.watch(countProvider);
yield button([text("click2")],
onClick: (){
print("click");
context.read(countProvider.notifier).state = count + 1;
}
); ♂
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class Button extends StatelessComponent {
Button({required this.label, required this.onPressed});
final String label;
final void Function() onPressed;
@override
Iterable build(BuildContext context) sync* {
yield DomComponent(
tag: 'button',
events: {'click': (e) => onPressed()},
child: Text(label),
);
}
}
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Preloading and Syncing Provider
● Server-Side Rendering
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final initialTokenProvider = SyncProvider((ref) async {
final res = await http.get(
Uri.parse(
"https://us.api.blizzard.com/data/wow/token/index?namespace=dynamic-us&lo
cale=en_US",
),
headers: {'Authorization': 'Bearer '});
final token = Token.fromJson(json.decode(res.body));
return token.price ?? 0;
}, id: 'init_token');
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Jaspr Deploying
● Github Page
● Firebase
● Docker
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jobs:
deploy:
environment:
name: github-pages
url: ${{ steps.deployment.outputs.page_url }}
runs-on: ubuntu-latest
steps:
- name: Checkout
uses: actions/checkout@v4
- name: Setup Pages
uses: actions/configure-pages@v5
- name: Upload artifact
uses: actions/upload-pages-artifact@v3
with:
# Upload entire repository
path: '.'
- name: Deploy to GitHub Pages
id: deployment
uses: actions/deploy-pages@v4
Github Page & Action
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Github Page & Action
jobs:
# Single deploy job since we're just deploying
deploy:
environment:
name: github-pages
url: ${{ steps.deployment.outputs.page_url }}
runs-on: ubuntu-latest
steps:
- name: Checkout
uses: actions/checkout@v4
- name: Setup Pages
uses: actions/configure-pages@v5
- name: "Setup Dart"
uses: dart-lang/setup-dart@v1.3
- name: "Setup Flutter"
uses: subosito/flutter-action@v2
- name: "Build Jaspr"
run: |
dart pub global activate jaspr_cli
jaspr build --verbose
- name: Upload artifact
uses: actions/upload-pages-artifact@v3
with:
# Upload entire repository
path: 'build/jaspr'
- name: Deploy to GitHub Pages
id: deployment
uses: actions/deploy-pages@v4
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Github Page & Action
jobs:
# Single deploy job since we're just deploying
deploy:
environment:
name: github-pages
url: ${{ steps.deployment.outputs.page_url }}
runs-on: ubuntu-latest
steps:
- name: Checkout
uses: actions/checkout@v4
- name: Setup Pages
uses: actions/configure-pages@v5
- name: "Setup Dart"
uses: dart-lang/setup-dart@v1.3
- name: "Setup Flutter"
uses: subosito/flutter-action@v2
- name: "Build Jaspr"
run: |
dart pub global activate jaspr_cli
jaspr build --verbose
- name: Upload artifact
uses: actions/upload-pages-artifact@v3
with:
# Upload entire repository
path: 'build/jaspr'
- name: Deploy to GitHub Pages
id: deployment
uses: actions/deploy-pages@v4
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Summary
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● Flutter Web & Dart Web
○ Renderer, WASM
● Jaspr
○ Open-Source
○ Documents
○ Differences to Flutter Web
○ CLI
○ Rendering Modes
○ Project Structure
○ Component & Styling (CSS)
○ State Management
○ Deploy
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Thank You.
Incheon / Songdo
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