WebCell

简体中文 | English

基于 VDOM、JSX、MobX 和 TypeScript 的 Web 组件 引擎

特性

引擎比较

特性	WebCell 3	WebCell 2	React	Vue
JS 语言	TypeScript 5	TypeScript 4	ECMAScript 或 TypeScript	ECMAScript 或 TypeScript
JS 语法	ES 装饰器 stage-3	ES 装饰器 stage-2
XML 语法	JSX import	JSX factory	JSX factory/import	HTML/Vue 模板或 JSX（可选）
DOM API	Web 组件	Web 组件	HTML 5+	HTML 5+
视图渲染器	DOM Renderer 2	SnabbDOM	（内置）	SnabbDOM（分叉）
state API	MobX @observable	this.state	this.state 或 useState()	this.$data 或 ref()
props API	MobX @observable	@watch	this.props 或 props => {}	this.$props 或 defineProps()
状态管理	MobX 6+	MobX 4/5	Redux	VueX
页面路由器	JSX 标签	JSX 标签 + JSON 数据	JSX 标签	JSON 数据
资源打包工具	Parcel 2	Parcel 1	webpack	Vite

安装

npm install dom-renderer mobx web-cell
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Web 浏览器用法

演示和 GitHub 模板

项目引导

工具链

npm install parcel @parcel/config-default @parcel/transformer-typescript-tsc -D
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package.json

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

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

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

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

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

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

子元素插槽

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

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

new DOMRenderer().render(
    <>
        <Hello>WebCell</Hello>
        {/* 或 */}
        <hello-world>WebCell</hello-world>
    </>
);
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DOM 属性

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>你好，{this.name}!</h1>;
    }
}

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

// 或在 TypeScript 中提示 HTML 标签属性

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

函数组件

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)}>
        计数：{couterStore.times}
    </button>
));

new DOMRenderer().render(<Counter />);
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类组件

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}>计数：{this.times}</button>;
    }
}

new DOMRenderer().render(<Counter />);
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CSS 作用域

内联样式

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>
            </>
        );
    }
}
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链接样式表

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>
            </>
        );
    }
}
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CSS 模块

scoped.css

.btn {
    color: white;
    background: lightblue;
}
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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>
        );
    }
}
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事件委托

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(`编辑行：${id}`);
    }

    render() {
        return (
            <table>
                <tr>
                    <td>1</td>
                    <td>A</td>
                    <td>
                        <button data-id="1">编辑</button>
                    </td>
                </tr>
                <tr>
                    <td>2</td>
                    <td>B</td>
                    <td>
                        <button data-id="2">编辑</button>
                    </td>
                </tr>
                <tr>
                    <td>3</td>
                    <td>C</td>
                    <td>
                        <button data-id="3">编辑</button>
                    </td>
                </tr>
            </table>
        );
    }
}
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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(`新值：${newValue}，旧值：${oldValue}`);
    }

    render() {
        return <button onClick={this.handleClick}>计数：{this.times}</button>;
    }
}
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表单关联

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>提交</button>
    </form>
);
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异步组件

AsyncTag.tsx

import { FC } from 'web-cell';

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

export default AsyncTag;
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index.tsx

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

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

new DOMRenderer().render(<AsyncTag />);
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Animate CSS 组件

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

new DOMRenderer().render(
    <AnimateCSS type="fadeIn" component={props => <h1 {...props}>淡入</h1>} />
);
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Node.js 用法

工具链

npm install jsdom element-internals-polyfill
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Polyfill

import 'web-cell/polyfill';
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基础知识

• Web 组件
• 自定义元素
• 虚拟 DOM
• Element Internals
• CSS 变量
• ECMAScript 6+
• TypeScript 5+

生命周期钩子

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

脚手架

1. 基础
2. 仪表盘
3. 静态网站

生态系统

我们建议将这些库与 WebCell 一起使用：

• 状态管理：MobX（也由 TypeScript 和 Decorator 提供支持）

• 路由：Cell Router

• UI 组件

  • BootCell（基于 BootStrap v5）
  • Material Web（基于 Material Design）
  • GitHub Web Widget

• HTTP请求：KoAJAX（基于 类Koa 中间件）

• 实用程序：Web utility（方法和类型）

• 事件流：Iterable Observer（Observable 提案）

• MarkDown 集成：Parcel MDX transformer（MDX 编译器插件）

路线图

• 服务器端渲染
• 异步组件加载

v2 到 v3 迁移

更多指南

1. 开发贡献