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omi

现代化 Web 组件框架 响应式编程与跨框架开发的优选

Omi是一款轻量级高性能的Web组件框架,支持信号驱动的响应式编程。它集成了Web Components、JSX、路由、Suspense等功能,同时兼容面向对象和数据驱动的编程范式。Omi提供丰富的模板和UI组件,便于快速构建现代Web应用。其小巧的体积、出色的性能以及灵活的样式管理,使其成为开发者的理想选择。

English | 简体中文

omi

Omi - Web Components Framework

import { render, signal, tag, Component, h } from 'omi'

const count = signal(0)

function add() {
  count.value++
}

function sub() {
  count.value--
}

@tag('counter-demo')
export class CounterDemo extends Component {
  static css = 'span { color: red; }'

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

Use this component:

import { h } from 'omi'
import './counter-demo'

render(<counter-demo />, document.body)

// or 
import { CounterDemo, Other } from './counter-demo'
// Prevent tree Shaking when importing other things
render(<CounterDemo />, document.body)

// or
document.body.appendChild(document.createElement('counter-demo'))

Install

npm i omi

To quickly create an Omi + Vite + TS/JS project:

$ npx omi-cli init my-app    # or create js project by: npx omi-cli init-js my-app
$ cd my-app           
$ npm start           # develop
$ npm run build       # release

To quickly create an Omi + Router + Signal + Suspense + Tailwindcss + Vite + TS project:

$ npx omi-cli init-spa my-app  
$ cd my-app           
$ npm start           # develop
$ npm run build       # release

Packages

  • Core packages
    • omi - Implementation of omi framework.
    • omi-form - Powerful, simple and cross frameworks form solution.
    • lucide-omi - Lucide icon collection for omi.
    • omiu - Hope to create the best web components. For example, the powerful vchart and vtable
    • omi-router - Create SPA of omi framework.
    • omi-cli - To quickly create an Omi + Vite + TS/JS project.
  • Starter kits (not published to npm)
    • omi-elements - Tailwind Element Omi UI KIT.
    • omi-starter-spa - A starter repo for building single page app using Omi + OmiRouter + Tailwindcss + TypeScript + Vite + Prettier.
    • omi-starter-ts - A starter repo for building web app or reusable components using Omi in TypeScript base on Vite.
    • omi-starter-tailwind - A starter repo for building web app or reusable components using Omi + Tailwindcss + TypeScript + Vite.
    • omi-starter-js - A starter repo for building web app or reusable components using Omi in JavaScript base on Vite.
    • omi-vue - Vue SFC + Vite + OMI + OMI-WeUI.
  • Components
  • Directives
    • omi-transition - Applying animations when an component is entering and leaving the DOM.
    • omi-ripple - A lightweight component for adding ripple effects to user interface elements.
  • Examples (not published to npm)

If you want to help the project grow, start by simply sharing it with your peers!

Thank you!

Usage

TodoApp with reactivity functions

Data oriented programming

In data-oriented programming, the focus is on the data itself and the operations on the data, rather than the objects or data structures that hold the data. This programming paradigm emphasizes the change and flow of data, and how to respond to these changes. The TodoApp with reactivity functions is a good example of this, using the concepts of reactive programming, where the UI automatically updates to reflect changes in the data (i.e., the to-do list).

import { render, signal, computed, tag, Component, h } from 'omi'

const todos = signal([
  { text: 'Learn OMI', completed: true },
  { text: 'Learn Web Components', completed: false },
  { text: 'Learn JSX', completed: false },
  { text: 'Learn Signal', completed: false }
])

const completedCount = computed(() => {
  return todos.value.filter(todo => todo.completed).length
})

const newItem = signal('')

function addTodo() {
  // api a
  todos.value.push({ text: newItem.value, completed: false })
  todos.update() // Trigger UI auto update
  
  // api b, same as api a
  // todos.value = [...todos.value, { text: newItem.value, completed: false }]

  newItem.value = '' // Changing the value type can automatically update the UI
}

function removeTodo(index: number) {
  todos.value.splice(index, 1)
  todos.update() // Trigger UI auto update
}

@tag('todo-list')
class TodoList extends Component {
  onInput = (event: Event) => {
    const target = event.target as HTMLInputElement
    newItem.value = target.value
  }

  render() {
    return (
      <>
        <input type="text" value={newItem.value} onInput={this.onInput} />
        <button onClick={addTodo}>Add</button>
        <ul>
          {todos.value.map((todo, index) => {
            return (
              <li>
                <label>
                  <input
                    type="checkbox"
                    checked={todo.completed}
                    onInput={() => {
                      todo.completed = !todo.completed
                      todos.update() // Trigger UI auto update
                    }}
                  />
                  {todo.completed ? <s>{todo.text}</s> : todo.text}
                </label>
                {' '}
                <button onClick={() => removeTodo(index)}>❌</button>
              </li>
            )
          })}
        </ul>
        <p>Completed count: {completedCount.value}</p>
      </>
    )
  }
}

render(<todo-list />, document.body)

TodoApp with Signal Class

Object oriented programming

In object-oriented programming, the focus is on the objects, which contain both data and methods to operate on the data. This programming paradigm emphasizes the interaction and cooperation between objects, and how to organize and manage code through object encapsulation, inheritance, and polymorphism. The TodoApp with reactivity functions can also be implemented in an object-oriented way, for example, by creating a TodoList class that contains the data of the to-do list and methods to operate on this data, as well as a update method to update the UI.

import { render, Signal, tag, Component, h, computed } from 'omi'

type Todo = { text: string, completed: boolean }

class TodoApp extends Signal<{ todos: Todo[], filter: string, newItem: string }> {
  completedCount: ReturnType<typeof computed>

  constructor(todos: Todo[] = []) {
    super({ todos, filter: 'all', newItem: '' })
    this.completedCount = computed(() => this.value.todos.filter(todo => todo.completed).length)
  }

  addTodo = () => {
    // api a
    this.value.todos.push({ text: this.value.newItem, completed: false })
    this.value.newItem = ''
    this.update()

    // api b, same as api a
    // this.update((value) => {
    //   value.todos.push({ text: value.newItem, completed: false })
    //   value.newItem = ''
    // })
  }

  toggleTodo = (index: number) => {
    const todo = this.value.todos[index]
    todo.completed = !todo.completed
    this.update()
  }

  removeTodo = (index: number) => {
    this.value.todos.splice(index, 1)
    this.update()
  }
}

const todoApp = new TodoApp([
  { text: 'Learn OMI', completed: true },
  { text: 'Learn Web Components', completed: false },
  { text: 'Learn JSX', completed: false },
  { text: 'Learn Signal', completed: false }
])

@tag('todo-list')
class TodoList extends Component {
  onInput = (event: Event) => {
    const target = event.target as HTMLInputElement
    todoApp.value.newItem = target.value
  }

  render() {
    const { todos } = todoApp.value
    const { completedCount, toggleTodo, addTodo, removeTodo } = todoApp
    return (
      <>
        <input type="text" value={todoApp.value.newItem} onInput={this.onInput} />
        <button onClick={addTodo}>Add</button>
        <ul>
          {todos.map((todo, index) => {
            return (
              <li>
                <label>
                  <input
                    type="checkbox"
                    checked={todo.completed}
                    onInput={() => toggleTodo(index)}
                  />
                  {todo.completed ? <s>{todo.text}</s> : todo.text}
                </label>
                {' '}
                <button onClick={() => removeTodo(index)}>❌</button>
              </li>
            )
          })}
        </ul>
        <p>Completed count: {completedCount.value}</p>
      </>
    )
  }
}

render(<todo-list />, document.body)

We won't discuss which method is good or bad here. You can choose either method using omi.

Auto Import h

vite.config.js:

import { defineConfig } from 'vite'

export default defineConfig({
  esbuild: {
    jsxInject: "import { h } from 'omi'",
    jsxFactory: "h",
    jsxFragment: "h.f"
  }
})

You can inject code during construction, so you don't have to manually export h.

Define Cross Framework Component

The case of using Omi component in Vue is as follows:

my-counter.tsx:

import { tag, Component, h, bind } from 'omi'

@tag('my-counter')
class MyCounter extends Component {
  static props = {
    count: {
      type: Number,
      default: 0,
      changed(newValue, oldValue) {
        this.state.count = newValue
        this.update()
      }
    }
  }

  state = {
    count: null
  }

  install() {
    this.state.count = this.props.count
  }

  @bind
  sub() {
    this.state.count--
    this.update()
    this.fire('change', this.state.count)
  }

  @bind
  add() {
   
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