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omi

Omi: Next Generation Web Framework in 4kb JavaScript

Merge JSX, Web Components, Proxy, Store, Path Updating together

Why Omi?

  • Tiny size. (4kb gzipped)
  • Supports TypeScript.
  • Reactive data-binding
  • Based on Shadow DOM
  • Easy to debug via Omi DevTools Extension [Install from Chrome WebStore]
  • Compliance with browser trend and API design.
  • Merge Web Components and JSX into one framework.
  • Built in observe feature (No need to call this.update()).
  • 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).
  • The original Path Updating system. Proxy-based automatic accurate update, low power consumption, high degree of freedom, excellent performance, easy integration of requestIdleCallback
  • Say goodbye to this.update method when using store system! It will automatically update UI partially when data is changed.
  • Look at Facebook React vs Web Components，Omi combines their advantages and gives developers the freedom to choose the way they like.
  • Shadow DOM merges with Virtual DOM, Omi uses both virtual DOM and real Shadow DOM to make view updates more accurate and faster.
  • With a Store system, 99.9% of projects don't need time travel, and not only Redux can travel, please don't come up on Redux, Omi store system can meet all projects
  • 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 React

Omi uses Shadow DOM based style isolation and semantic structure.

Ecosystem of Omi

Project Description
omi-docs Omi official documents
omi-devtools Browser DevTools extension
omi-cli Project scaffolding
omi-i18n Internationalization solution for omi.js using i18next ecosystem
omi-transform Omi / css3transform integration. Made css3 transform super easy in your Omi project.
omi-router Omi official router
omi-page Tiny client-side router by page
omi-tap Support tap event 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-mobx Omi Mobx Adapter
omi-use React hooks like API
omi-native Render web components to native
omi element ui(working) Omi version of element-ui
omi-weui(working) Weui for Omi.

Useful Resources

Overview of the Readme

Add Omi in One Minute

This page demonstrates using Omi with no build tooling.

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8" />
  <title>Add Omi in One Minute</title>
</head>

<body>
  <script src="https://unpkg.com/omi"></script>
  <script>
    const { WeElement, h, render, define } = Omi

    define('like-button',
      class extends WeElement {
        install() {
          this.data = { liked: false }
        }

        render() {
          if (this.data.liked) {
            return 'You liked this.'
          }

          return h(
            'button',
            {
              onClick: () => {
                this.data.liked = true
                this.update()
              }
            },
            'Like'
          )
        }
      })

    render(h('like-button'), 'body')
  </script>
</body>

</html>

You can also use like-button tag directly in HTML：

<body>
  <like-button />
</body>

Add Omi in 30 Seconds

You can also quickly build omi projects using modern JS code:

import { render, WeElement, tag, observe } from "omi"

@observe
@tag("my-counter")
class MyCounter extends WeElement {

  data = {
    count: 0
  }

  sub = () => {
    this.data.count--
  }

  add = () => {
    this.data.count++
  }

  render() {
    return (
      <div>
        <button onClick={this.sub}>-</button>
        <span>{this.data.count}</span>
        <button onClick={this.add}>+</button>
      </div>
    )
  }
}

render(<my-counter />, "body")

→ counter demo

You will find that the MyCounter class name defined above is never used. So you can also use the following way to avoid Eslint hints:

import { render, WeElement, define } from 'omi'

define('my-counter', class extends WeElement {
    static observe = true
    
    data = {
      count: 1
    }

    sub = () => {
      this.data.count--
    }

    add = () => {
      this.data.count++
    }

    render() {
      return (
        <div>
          <button onClick={this.sub}>-</button>
          <span>{this.data.count}</span>
          <button onClick={this.add}>+</button>
        </div>
      )
    }
  })

render(<my-counter />, 'body')

You can also be defined as a form of pure functions:

import { define, render } from 'omi'

define('my-counter', function() {
  const [count, setCount] = this.use({
    data: 0,
    effect: function() {
      document.title = `The num is ${this.data}.`
    }
  })

  this.useCss(`button{ color: red; }`)

  return (
    <div>
      <button onClick={() => setCount(count - 1)}>-</button>
      <span>{count}</span>
      <button onClick={() => setCount(count + 1)}>+</button>
    </div>
  )
})

render(<my-counter />, 'body')

If you don't need effect, you can use useData directly:

const [count, setCount] = this.useData(0)

Getting Started

Install

$ npm i omi-cli -g               # install cli
$ omi init your_project_name     # init project, you can also exec 'omi init' in an empty folder
$ cd your_project_name           # please ignore this command if you executed 'omi init' in an empty folder
$ npm start                      # develop
$ npm run build                  # release

Directory description:

├─ config
├─ public
├─ scripts
├─ src
│  ├─ assets
│  ├─ elements    //Store all custom elements
│  ├─ store       //Store all this store of pages
│  ├─ admin.js    //Entry js of compiler，will build to admin.html
│  └─ index.js    //Entry js of compiler，will build to index.html

About compiled website URL：

Such as in windows:

"scripts": {
  "start": "node scripts/start.js",
  "_build": "node scripts/build.js",
  "build":"set PUBLIC_URL=https://fe.wxpay.oa.com/dv&& npm run _build"
}

In mac os:

"scripts": {
    "start": "node scripts/start.js",
    "_build": "node scripts/build.js",
    "build":"PUBLIC_URL=https://fe.wxpay.oa.com/dv npm run _build",
    "fix": "eslint src --fix"
  },

TypeScript Template(omi-cli v3.0.3+):

$ npm i omi-cli -g                  # install cli
$ omi init-ts your_project_name     # init project, you can also exec 'omi init-ts' in an empty folder
$ cd your_project_name              # please ignore this command if you executed 'omi init' in an empty folder
$ npm start                         # develop
$ npm run build                     # release

CLI's auto-created project scaffolding is based on a single-page create-react-app to be converted into a multi-page one, with configuration issues to see create-react-app user guide

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()
  }

  css() {
    return `
        div {
          color: red;
          cursor: pointer;
        }`
  }

  render(props) {
    return (
      <div onClick={this.onClick}>
        Hello {props.msg} {props.propFromParent}
        <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', passToChild: 123 }

  // define CustomEvent Handler
  onAbc = evt => {
    // get evt data by evt.detail
    this.data.abc = ' by ' + evt.detail.name
    this.data.passToChild = 1234
    this.update()
  }

  css() {
    return `
         div{
             color: green;
         }`
  }

  render(props, data) {
    return (
      <div>
        Hello {props.name} {data.abc}
        <hello-element
          onAbc={this.onAbc}
          prop-from-parent={data.passToChild}
          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", 
      }
    ]
  ]
}

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'

// typeof cssStr is string
import cssStr from './_index.css'

@tag('my-app')
class MyApp extends WeElement {

  css() {
    return cssStr
  }
  ...
  ...
  ...

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

TodoApp

Here is a relatively complete example of TodoApp:

import { define, render, WeElement } from 'omi'

define('todo-list', function(props) {
  return (
    <ul>
      {props.items.map(item => (
        <li key={item.id}>{item.text}</li>
      ))}
    </ul>
  )
})

define('todo-app', class extends WeElement {
  static observe = true

  data = { items: [], text: '' }

  render() {
    return (
      <div>
        <h3>TODO</h3>
        <todo-list items={this.data.items} />
        <form onSubmit={this.handleSubmit}>
          <input
            id="new-todo"
            onChange={this.handleChange}
            value={this.data.text}
          />
          <button>Add #{this.data.items.length + 1}</button>
        </form>
      </div>
    )
  }

  handleChange = e => {
    this.data.text = e.target.value
  }

  handleSubmit = e => {
    e.preventDefault()
    if (!this.data.text.trim().length) {
      return
    }
    this.data.items.push({
      text: this.data.text,
      id: Date.now()
    })
    this.data.text = ''
  }
})

render(<todo-app />, 'body')

Store

Say goodbye to this.update method when using store system! It will automatically update the UI partially when data is changed. The powerful Store architecture is high-performanced since all the data is mounted on the store, except for components that rely on props to determine the state of the component.

export default {
  data: {
    items: [],
    text: "",
    firstName: "dnt",
    lastName: "zhang",
    fullName: function() {
      return this.firstName + this.lastName;
    },
    globalPropTest: "abc", // Change it will refresh all elements without changing the components and page declaring data dependency.
    ccc: { ddd: 1 } // Change it will refresh all elements without changing the components and page declaring data dependency.
  },
  globalData: ["globalPropTest", "ccc.ddd"],
  add: function() {
    if (!this.data.text.trim().length) {
      return;
    }
    this.data.items.push({
      text: this.data.text,
      id: Date.now()
    });
    this.data.text = "";
  }
  // Default value is false, set to true will update all instances when data changing.
  // updateAll: true
};

Custom Element requires declaring dependent data so that Omi stores compute the dependency path based on the data declared on the custom component and update it locally as needed. Such as:

define('todo-app', class extends WeElement {
  // If you use store, the data is only used to declare dependencies.
  static get data() {
    return { items: [], text: "" };
  }
  // ...
  handleChange = e => {
    this.store.data.text = e.target.value;
  };

  handleSubmit = e => {
    e.preventDefault();
    this.store.add();
  };
})
  • The logic of data is encapsulated in the store definition method (such as store.add).
  • Views are only responsible for passing data to store, such as calling store.add or setting store.data.text on top.

You need to inject store from the root node at render time to use this store:

render(<todo-app />, "body", store);

→ Store Source Code

Summary：

  • store.data is used to list all attributes and default values (except the components of the view decided by props).
  • The static data of the element is used to list the attributes of the dependent store.data (Omi will record path) and update on demand.
  • If there are few simple components on the page, updateAll can be set to true, and components and pages don't need to declare data, and they don't update on demand
  • The path declared in globalData refreshes all pages and components by modifying the value of the corresponding path, which can be used to list all pages or most of the public properties path

Observe

Omi Observe

You can also use observe to create response views for element who no need store, such as:

import { define, WeElement } from "omi"

define("my-app", class extends WeElement {
  static observe = true

  install() {
    this.data.name = "omi"
  }

  onClick = () => {
    this.data.name = "Omi V4.0"
  }

  render(props, data) {
    return (
      <div onClick={this.onClick}>
        <h1>Welcome to {data.name}</h1>
      </div>
    )
  }
})

It should be noted that if observe is used, do not set the value of data in some of the following functions: some complex objects such as obj or arr:

  • render
  • beforeRender
  • beforeUpdate
  • afterUpdate

Because data settings will simply compare the value before and after, complex objects will not be deep contrast, the contrast value will trigger different update, update will trigger the above function, infinite recursion.

For Example:

❌Wrong way:

beforeRender(){
  this.data.a = { b: 1 }
}

✅ Right way:

beforeRender(){
  this.data.a.b = 1 
}

If you want to be compatible with IE11, please use the omi-mobx instead of omi's own observe.

Omi Mobx

import { tag, WeElement } from "omi"
import { observe } from "omi-mobx"

@observe
@tag("my-app")
class MyApp extends WeElement {
  install() {
    this.data.name = "omi"
  }

  onClick = () => {
    this.data.name = "Omi V4.0"
  }

  render(props, data) {
    return (
      <div onClick={this.onClick}>
        <h1>Welcome to {data.name}</h1>
      </div>
    )
  }
}

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
afterUpdate after update
beforeRender before render()

Debugging

Using Omi DevTools you can simply debug and manage your UI without any configuration. Just install and debug.

Since Omi uses Web Components and Shadow-DOM, it doesn't need to have another elements panel such as React or Vue has. It just adds a panel to the Elements' sidebar and it's powerful as much as React and Vue DevTools.

Omi DevTools

React to Omi

For example, the below is about migration React button as weui Omi button:

react to omi

Browsers Support

Omi 4.0+ works in the latest two versions of all major browsers: Safari 10+, IE 11+, and the evergreen Chrome, Firefox, and Edge.

→ Browsers Support

→ Polyfills

If you want to be compatible with IE11, use the Omi file of → this project. This project uses JSON Diff + Timer instead of Proxy.

You can dynamically load the JS of this project in the IE11 environment, and the proxy version is still used in other environments.

You can also give up the store system and use omi-mobx to be compatible with IE11.

Contribution

  1. Fork it (https://github.com/Tencent/omi/fork)
  2. Create your branch (git checkout -b my-urgent-hotfix)
  3. Commit your changes (git commit -am 'Fixed something')
  4. Push to the branch (git push origin my-urgent-hotfix)
  5. Create a new Pull Request

Please contact us for any questions:

Thanks

License

MIT © Tencent