Omi - Front End Cross-Frameworks Framework

Omiu - Cross-Frameworks and Cross-Themes UI Components powered by Omi

Define cross-frameworks button element with typescript:

import { tag, WeElement, h, extractClass } from 'omi'
import * as css from './index.scss'

interface Props {
  size?: 'medium' | 'small' | 'mini',
  type?: 'primary' | 'success' | 'warning' | 'danger' | 'info' | 'text'
  plain?: boolean,
  round?: boolean,
  circle?: boolean,
  loading?: boolean,
  disabled?: boolean,
  icon?: string,
  autofocus?: boolean,
  nativeType?: 'button' | 'submit' | 'reset',
  block?: boolean
  text?: string
}

@tag('o-button')
export default class Button extends WeElement<Props>{
  static css = css

  static defaultProps = {
    plain: false,
    round: false,
    circle: false,
    loading: false,
    disabled: false,
    autofocus: false,
    nativeType: 'button',
    block: false
  }

  static propTypes = {
    size: String,
    type: String,
    plain: Boolean,
    round: Boolean,
    circle: Boolean,
    loading: Boolean,
    disabled: Boolean,
    icon: String,
    autofocus: Boolean,
    nativeType: String,
    block: Boolean,
    text: String
  }

  render(props) {
    return <button disabled={props.disabled} {...extractClass(props, 'o-button', {
      ['o-button-' + props.type]: props.type,
      ['o-button-' + props.size]: props.size,
      'is-plain': props.plain,
      'is-round': props.round,
      'is-circle': props.circle,
      'is-disabled': props.disabled,
      'is-block': props.block
    })} type={props.nativeType} >
      {props.loading && <i class='icon-loading'></i>}
      {props.text}
      <slot></slot>
    </button>
  }
}

New Project by Omi

$ npm i omi-cli -g    # install cli
$ omi init my-app     # init project
$ cd my-app           
$ npm start           # develop
$ npm run build       # release

npx omi-cli init my-app is also supported(npm v5.2.0+).

New Component by Omi

$ npm i omi-cli -g    # install cli
$ omi init-component my-component     # init project
$ cd my-app           
$ npm start           # develop
$ npm run build       # release

npx omi-cli init-component my-component is also supported(npm v5.2.0+).

Ecosystem of Omi

💯Base

Project	Description
omi-docs and codepen	Omi official documents
omi-router	Omi official router in 1KB js
omi-cli	Project scaffolding. → Base Templates
CEE	Fork from custom-elements-everywhere

🐍Snake MVP

Project	Description
omi-snake & → Touch the demo	The Snake-Eating Game Based on MVP Architecture Written by Omi
omi-kbone-snake	omi-kbone 写的 MVP 架构的跨端贪吃蛇游戏，支持小程序和 H5
Preact-snake	The Snake-Eating Game Based on MVP Architecture Written by Preact + Preact-CSS + Omis
[P]react-snake	The Snake-Eating Game Based on MVP Architecture Written by React/Preact
omix-snake	小程序贪吃蛇

📚Other

Project	Description
omi-piano	Build piano with Omi and Omi Snippets, Enjoy now!
omi-devtools	Browser DevTools extension
omi-chart	Simple HTML5 Charts using chart-x tag.
md2site	Static Site Generator with markdown powered by Omio.
omi-30-seconds	Useful Omi snippets that you can understand in 30 seconds.
omi-canvas	Perfect fusion of web components, jsx and canvas.
omi-swiper	Omi + Swiper
omi-vscode	VSCode extension for omi, Install now!
omi-ex	Omi.js extension(TypeScript)
omi-transform	Omi / css3transform integration. Made css3 transform super easy in your Omi project.
omi-finger	Support touch and gesture events in your Omi project.
omi-touch	Smooth scrolling, rotation, pull to refresh and any motion for the web.
omi-native	Render web components to native
omi-i18n	Internationalization solution for omi.js using i18next ecosystem
omie	Build cross platform desktop apps with Omi.js and Electron.js
omi-cv	Create a front-end engineer curriculum vitae, Get Started!
Soo	Has same API as omi but is great alternative if you want to create custom elements without JSX, virtual DOM and store

Why Omi?

Tiny size and High performance
Cross frameworks(react, preact, vue, angular), components of omi are pure custom elements
One framework. Mobile & desktop & mini program
Stateless View Architecture Design
Be friendly to custom elements, you can pass false attributes to elements through string '0' or string 'false', you can pass object attributes to elements through : prefix and Omi.$
Easy two way binding by extend api
Enhanced CSS, rpx unit support base on 750 screen width
Compliance with browser trend and API design
Merge Web Components, JSX into one framework
Web Components can also be a data-driven view, UI = fn(data).
JSX is the best development experience (code intelligent completion and tip) UI Expression with least grammatical noise and it's turing complete(template engine is not, es template string is but grammatical noise is too loud)
Look at Facebook React vs Web Components，Omi combines their advantages and gives developers the freedom to choose the way they like
Shadow DOM or Light DOM merges with Virtual DOM, Omi uses both virtual DOM and real Shadow DOM to make view updates more accurate and faster
Scoped CSS's best solution is Shadow DOM, the community churning out frameworks and libraries for Scoped CSS (using JS or JSON writing styles such as Radium, jsxstyle, react-style; binding to webpack using generated unique className filename-classname-hash, such as CSS Modules, Vue), are hack technologies; and Shadow DOM Style is the perfect solution.

Compare TodoApp by Omi and React, Omi and React rendering DOM structure:

Omi	React

Omi uses Shadow DOM or Light DOM based style isolation and semantic structure.

Useful Resources

Title Name	Other language	Related
Web Components bookmarks
Snake-Eating Game Making with Web Components of Omi and MVP Architecture
Constructable Stylesheets: seamless reusable styles
Web Components specifications
Web Components in a Nutshell
Using Web Components with React in 2019
Using Web Components in React
Styling We Components Using A Shared Style Sheet
Developer Tools support for Web Components in Firefox 63
Develop W3C Web Components with WebAssembly
60FPS Animation In Omi	简体中文 한국어
Render Web Components To Native	简体中文 한국어
Shadow Dom In Depth	简体中文
Part Theme Explainer	求翻译
Web Components MDN	简体中文
Web Components Google
Web Components Org
Web Components: the Right Way
Proxy MDN	简体中文 한국어
CSS Variables	简体中文 한국어
CSS Shadow Parts
Platform HTML5
Using requestIdleCallback	简体中文	A polyfill
The Power Of Web Components	简体中文
ShadowRoot	简体中文

Overview of the Readme

Getting Started

Project Template

Template Type	Command	Describe
Base Template	`omi init my-app`	Basic omi project template.
Kbone Template	`omi init-kbone my-app`	Developing mini program or web using omi.

Hello Element

Define a custom element by extending WeElement base class:

import { define, WeElement } from 'omi'

define('hello-element', class extends WeElement {
  onClick = evt => {
    // trigger CustomEvent
    this.fire('Abc', { name: 'dntzhang', age: 12 })
    evt.stopPropagation()
  }

  //If you need to use <hello-element></hello-element> directly in html, you must declare propTypes
  static propTypes = {
    msg: String
  }

  static css = `
      div {
        color: red;
        cursor: pointer;
      }`

  render(props) {
    return (
      <div onClick={this.onClick}>
        Hello {props.msg}
        <div>Click Me!</div>
      </div>
    )
  }
})

Using hello-element:

import { define, render, WeElement } from 'omi'
import './hello-element'

define('my-app', class extends WeElement {
  data = { abc: 'abc' }

  // define CustomEvent Handler
  onAbc = evt => {
    // get evt data by evt.detail
    this.data.abc = ' by ' + evt.detail.name
    this.update()
  }

  static css = `
      div{
          color: green;
      }`

  render(props) {
    return (
      <div>
        Hello {this.data.abc}
        <hello-element
          onAbc={this.onAbc}
          msg="WeElement"
        />
      </div>
    )
  }
})

render(<my-app name="Omi v4.0" />, 'body')

Tell Babel to transform JSX into Omi.h() call:

{
  "presets": ["env", "omi"]
}

The following two NPM packages need to be installed to support the above configuration:

"babel-preset-env": "^1.6.0",
"babel-preset-omi": "^0.1.1",

If you use babel7, you can also use the following packages and configuration:

npm install --save-dev @babel/preset-env
npm install --save-dev @babel/preset-react

{
  "presets": [
    "@babel/preset-env",
    [
      "@babel/preset-react",
      {
        "pragma": "Omi.h",
        "pragmaFrag": "Omi.h.f"
      }
    ]
  ]
}

If you don't want to write CSS in JS, you can use to-string-loader of webpack. For example, the following configuration:

{
  test: /[\\|\/]_[\S]*\.css$/,
  use: [
    'to-string-loader',
    'css-loader'
  ]
}

If your CSS file starts with "_", CSS will use to-string-loader, such as:

import { tag, WeElement render } from 'omi'

define('my-app', class extends WeElement {

  css = require('./_index.css')
  ...
  ...
  ...

You can also forget the tedious configuration and use omi-cli directly, no need to configure anything.

TypeScript Auto Complete

import { h, WeElement, tag, classNames } from 'omi';
import * as styles from './_index.less';

interface ButtonProps {
  href?: string,
  disabled?: boolean,
  type?: 'default' | 'primary' | 'danger',
  htmltype?: 'submit' | 'button' | 'reset',
  onClick?: (e: any) => void
}

const TAG = 'o-button'

declare global {
  namespace JSX {
    interface IntrinsicElements {
      [TAG]: Omi.Props & ButtonProps
    }
  }
}

@tag(TAG)
export default class oButton extends WeElement<ButtonProps> {
...
...
...

Lifecycle

Lifecycle method	When it gets called
`install`	before the component gets mounted to the DOM
`installed`	after the component gets mounted to the DOM
`uninstall`	prior to removal from the DOM
`beforeUpdate`	before update
`updated`	after update
`beforeRender`	before `render()`
`receiveProps`	parent element re-render will trigger it, `return false` will prevent update action

View registered elements

console.log(Omi.elements)

Browsers Support

Omi works in the latest two versions of all major browsers: Safari 10+, IE 11+, and the evergreen Chrome, Firefox, and Edge.

→ Browsers Support

→ Polyfills

<script src="https://unpkg.com/@webcomponents/[email protected]/webcomponents-bundle.js"></script>

Contribution

Build a example:

npm start example_name

Build omi:

npm run build

Unit testing

npm run test

Contributors

Any form of contribution is welcome. The above contributors have been officially released by Tencent.

We very much welcome developers to contribute to Tencent's open source, and we will also give them incentives to acknowledge and thank them. Here we provide an official description of Tencent's open source contribution. Specific contribution rules for each project are formulated by the project team. Developers can choose the appropriate project and participate according to the corresponding rules. The Tencent Project Management Committee will report regularly to qualified contributors and awards will be issued by the official contact.