WebCell

简体中文 | English

Web Components engine based on VDOM, JSX, MobX & TypeScript

Feature

Engines comparison

feature	WebCell 3	WebCell 2	React	Vue
JS language	TypeScript 5	TypeScript 4	ECMAScript or TypeScript	ECMAScript or TypeScript
JS syntax	ES decorator stage-3	ES decorator stage-2
XML syntax	JSX import	JSX factory	JSX factory/import	HTML/Vue template or JSX (optional)
DOM API	Web components	Web components	HTML 5	HTML 5
view renderer	DOM Renderer 2	SnabbDOM	(built-in)	SnabbDOM (forked)
state API	MobX @observable	this.state	this.state or useState()	this.$data or ref()
props API	MobX @observable	@watch	this.props or props => {}	this.$props or defineProps()
state manager	MobX 6	MobX 4/5	Redux	VueX
page router	JSX tags	JSX tags JSON data	JSX tags	JSON data
asset bundler	Parcel 2	Parcel 1	webpack	Vite

Installation

npm install dom-renderer mobx web-cell
Copy

Web browser usage

Demo & GitHub template

Project bootstrap

Tool chain

npm install parcel @parcel/config-default @parcel/transformer-typescript-tsc -D
Copy

package.json

{
    "scripts": {
        "start": "parcel source/index.html --open",
        "build": "parcel build source/index.html --public-url ."
    }
}
Copy

tsconfig.json

{
    "compilerOptions": {
        "target": "ES6",
        "module": "ES2020",
        "moduleResolution": "Node",
        "useDefineForClassFields": true,
        "jsx": "react-jsx",
        "jsxImportSource": "dom-renderer"
    }
}
Copy

.parcelrc

{
    "extends": "@parcel/config-default",
    "transformers": {
        "*.{ts,tsx}": ["@parcel/transformer-typescript-tsc"]
    }
}
Copy

source/index.html

<script src="https://polyfill.web-cell.dev/feature/ECMAScript.js"></script>
<script src="https://polyfill.web-cell.dev/feature/WebComponents.js"></script>
<script src="https://polyfill.web-cell.dev/feature/ElementInternals.js"></script>

<script src="source/MyTag.tsx"></script>

<my-tag></my-tag>
Copy

Function component

import { DOMRenderer } from 'dom-renderer';
import { FC, PropsWithChildren } from 'web-cell';

const Hello: FC<PropsWithChildren> = ({ children = 'World' }) => (
    <h1>Hello, {children}!</h1>
);

new DOMRenderer().render(<Hello>WebCell</Hello>);
Copy

Class component

Children slot

import { DOMRenderer } from 'dom-renderer';
import { component } from 'web-cell';

@component({
    tagName: 'hello-world',
    mode: 'open'
})
class Hello extends HTMLElement {
    render() {
        return (
            <h1>
                Hello, <slot />!
            </h1>
        );
    }
}

new DOMRenderer().render(
    <>
        <Hello>WebCell</Hello>
        {/* or */}
        <hello-world>WebCell</hello-world>
    </>
);
Copy

DOM Props

import { DOMRenderer } from 'dom-renderer';
import { observable } from 'mobx';
import { WebCell, component, attribute, observer } from 'web-cell';

interface HelloProps {
    name?: string;
}

interface Hello extends WebCell<HelloProps> {}

@component({ tagName: 'hello-world' })
@observer
class Hello extends HTMLElement implements WebCell<HelloProps> {
    @attribute
    @observable
    accessor name = '';

    render() {
        return <h1>Hello, {this.name}!</h1>;
    }
}

new DOMRenderer().render(<Hello name="WebCell" />);

// or for HTML tag props in TypeScript

declare global {
    namespace JSX {
        interface IntrinsicElements {
            'hello-world': HelloProps;
        }
    }
}
new DOMRenderer().render(<hello-world name="WebCell" />);
Copy

Inner state

Function component

import { DOMRenderer } from 'dom-renderer';
import { observable } from 'mobx';
import { FC, observer } from 'web-cell';

class CounterModel {
    @observable
    accessor times = 0;
}

const couterStore = new CounterModel();

const Counter: FC = observer(() => (
    <button onClick={() => (couterStore.times  = 1)}>
        Counts: {couterStore.times}
    </button>
));

new DOMRenderer().render(<Counter />);
Copy

Class component

import { DOMRenderer } from 'dom-renderer';
import { observable } from 'mobx';
import { component, observer } from 'web-cell';

@component({ tagName: 'my-counter' })
@observer
class Counter extends HTMLElement {
    @observable
    accessor times = 0;

    handleClick = () => (this.times  = 1);

    render() {
        return <button onClick={this.handleClick}>Counts: {this.times}</button>;
    }
}

new DOMRenderer().render(<Counter />);
Copy

CSS scope

Inline style

import { component } from 'web-cell';
import { stringifyCSS } from 'web-utility';

@component({
    tagName: 'my-button',
    mode: 'open'
})
export class MyButton extends HTMLElement {
    style = stringifyCSS({
        '.btn': {
            color: 'white',
            background: 'lightblue'
        }
    });

    render() {
        return (
            <>
                <style>{this.style}</style>

                <a className="btn">
                    <slot />
                </a>
            </>
        );
    }
}
Copy

Link stylesheet

import { component } from 'web-cell';

@component({
    tagName: 'my-button',
    mode: 'open'
})
export class MyButton extends HTMLElement {
    render() {
        return (
            <>
                <link
                    rel="stylesheet"
                    href="https://unpkg.com/[email protected]/dist/css/bootstrap.min.css"
                />
                <a className="btn">
                    <slot />
                </a>
            </>
        );
    }
}
Copy

CSS module

scoped.css

.btn {
    color: white;
    background: lightblue;
}
Copy

MyButton.tsx

import { WebCell, component } from 'web-cell';

import styles from './scoped.css' assert { type: 'css' };

interface MyButton extends WebCell {}

@component({
    tagName: 'my-button',
    mode: 'open'
})
export class MyButton extends HTMLElement implements WebCell {
    connectedCallback() {
        this.root.adoptedStyleSheets = [styles];
    }

    render() {
        return (
            <a className="btn">
                <slot />
            </a>
        );
    }
}
Copy

Event delegation

import { component, on } from 'web-cell';

@component({ tagName: 'my-table' })
export class MyTable extends HTMLElement {
    @on('click', ':host td > button')
    handleEdit(event: MouseEvent, { dataset: { id } }: HTMLButtonElement) {
        console.log(`editing row: ${id}`);
    }

    render() {
        return (
            <table>
                <tr>
                    <td>1</td>
                    <td>A</td>
                    <td>
                        <button data-id="1">edit</button>
                    </td>
                </tr>
                <tr>
                    <td>2</td>
                    <td>B</td>
                    <td>
                        <button data-id="2">edit</button>
                    </td>
                </tr>
                <tr>
                    <td>3</td>
                    <td>C</td>
                    <td>
                        <button data-id="3">edit</button>
                    </td>
                </tr>
            </table>
        );
    }
}
Copy

MobX reaction

import { observable } from 'mobx';
import { component, observer, reaction } from 'web-cell';

@component({ tagName: 'my-counter' })
@observer
export class Counter extends HTMLElement {
    @observable
    accessor times = 0;

    handleClick = () => (this.times  = 1);

    @reaction(({ times }) => times)
    echoTimes(newValue: number, oldValue: number) {
        console.log(`newValue: ${newValue}, oldValue: ${oldValue}`);
    }

    render() {
        return <button onClick={this.handleClick}>Counts: {this.times}</button>;
    }
}
Copy

Form association

import { DOMRenderer } from 'dom-renderer';
import { WebField, component, formField, observer } from 'web-cell';

interface MyField extends WebField {}

@component({
    tagName: 'my-field',
    mode: 'open'
})
@formField
@observer
class MyField extends HTMLElement implements WebField {
    render() {
        const { name } = this;

        return (
            <input
                name={name}
                onChange={({ currentTarget: { value } }) =>
                    (this.value = value)
                }
            />
        );
    }
}

new DOMRenderer().render(
    <form method="POST" action="/api/data">
        <MyField name="test" />

        <button>submit</button>
    </form>
);
Copy

Async component

AsyncTag.tsx

import { FC } from 'web-cell';

const AsyncTag: FC = () => <div>Async</div>;

export default AsyncTag;
Copy

index.tsx

import { DOMRenderer } from 'dom-renderer';
import { lazy } from 'web-cell';

const AsyncTag = lazy(() => import('./AsyncTag'));

new DOMRenderer().render(<AsyncTag />);
Copy

Async rendering (experimental)

DOM tree

import { DOMRenderer } from 'dom-renderer';

new DOMRenderer().render(
    <a>
        <b>Async rendering</b>
    </a>,
    document.body,
    'async'
);
Copy

Class component

import { component } from 'web-cell';

@component({
    tagName: 'async-renderer',
    renderMode: 'async'
})
export class AsyncRenderer extends HTMLElement {
    render() {
        return (
            <a>
                <b>Async rendering</b>
            </a>
        );
    }
}
Copy

Animate CSS component

import { DOMRenderer } from 'dom-renderer';
import { AnimateCSS } from 'web-cell';

new DOMRenderer().render(
    <AnimateCSS
        type="fadeIn"
        component={props => <h1 {...props}>Fade In</h1>}
    />
);
Copy

Node.js usage

Tool chain

npm install jsdom
Copy

Polyfill

import 'web-cell/polyfill';
Copy

Server Side Rendering

https://github.com/EasyWebApp/DOM-Renderer?tab=readme-ov-file#nodejs--bun

Basic knowledge

• Web components
• Custom elements
• Shadow DOM
• Element Internals
• CSS variables
• View transitions
• ECMAScript 6
• TypeScript 5

Life Cycle hooks

1. connectedCallback
2. disconnectedCallback
3. attributeChangedCallback
4. adoptedCallback
5. updatedCallback
6. mountedCallback
7. formAssociatedCallback
8. formDisabledCallback
9. formResetCallback
10. formStateRestoreCallback

Scaffolds

1. Basic
2. DashBoard
3. Mobile
4. Static site

Ecosystem

We recommend these libraries to use with WebCell:

• State management: MobX (also powered by TypeScript & Decorator)

• Router: Cell Router

• UI components

  • BootCell (based on BootStrap v5)
  • MDUI (based on Material Design v3)
  • GitHub Web Widget

• HTTP request: KoAJAX (based on Koa-like middlewares)

• Utility: Web utility methods & types

• Event stream: Iterable Observer (Observable proposal)

• MarkDown integration: Parcel MDX transformer (MDX Compiler plugin)

Roadmap

• [x] Server-side Render
• [x] Async Component loading

v2 to v3 migration

More guides

1. Development contribution