@uni-component/core NPM

uni-component

中文

Unified Component: Write once component, Run in multiple lib/platform.

Depend on @uni-store.

Unified Component core parts:

setup, like vue setup, just define the component state. The state can be used to any platforms. This should be contained pure component state logic.
render, optional. This should be used when platform support render function, like : web platform or miniapp which supported runtime render.

Refactor vuetify@next with uni-component.

Or see components for more uni-component usage cases.

Installation

pnpm add @uni-component/core
# or with yarn
yarn add @uni-component/core
# or with npm
npm install @uni-component/core

Usage

More cases, see @uni-component/components.

Define a component

import {
  h,
  PropType,
  uniComponent,
  uni2Platform,
  computed,
  ref
} from '@uni-component/core'

// pure setup state
export const UniButton = uniComponent('uni-button', {
  type: {
    type: String as PropType<'button' | 'submit' | 'reset'>,
    default: 'button'
  },
  text: String,
  icon: String,
  primary: Boolean,
  onClick: Function as PropType<(e?: MouseEvent) => any>
}, (name, props) => {
  const n = ref(0)

  const rootClass = computed(() => {
    return {
      [`${name}-primary`]: props.primary
    }
  })

  const clickAction = (e?: MouseEvent) => {
    n.value += 1
    // do others
    props.onClick && props.onClick(e)
  }

  return {
    n,
    rootClass,
    clickAction
  }
})

// platform component with pure render function
export const CubeButton = uni2Platform(UniButton, (props, state, { renders }) => {
  const { type, text } = props
  // rootClass always contain Component name, like 'cube-button'
  const { rootClass, n, clickAction } = state
  const t = text ? text : (renders.defaultRender && renders.defaultRender())
  return (
    <button class={rootClass} type={type} onClick={clickAction}>
      <span>{ t } { n }</span>
    </button>
  )
})

With Vue 3

Install:

pnpm add @uni-component/vue
# or with yarn
yarn add @uni-component/vue
# or with npm
npm install @uni-component/vue

Use:

/// <reference types="@uni-component/vue/platform" />
import { h, Fragment } from '@uni-component/core'
import '@uni-component/vue'
import { createApp } from 'vue'

const App = () => {
  return (
    <>
      <CubeButton>child</CubeButton>
      <CubeButton primary={true} text='text'></CubeButton>
    </>
  )
}

createApp(App).mount('#root')

JSX with tsconfig: { "jsxFactory": "h", "jsxFragmentFactory": "Fragment" }

With React

Install:

pnpm add @uni-component/react
# or with yarn
yarn add @uni-component/react
# or with npm
npm install @uni-component/react

Use:

/// <reference types="@uni-component/react/platform" />
import { h, Fragment } from '@uni-component/core'
import '@uni-component/react'
import ReactDOM from 'react-dom'

const App = () => {
  return (
    <>
      <CubeButton>child</CubeButton>
      <CubeButton primary={true} text='text'></CubeButton>
    </>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))

JSX with tsconfig: { "jsxFactory": "h", "jsxFragmentFactory": "Fragment" }

Documentation

Define pure state - Headless Component

In my opinion, the pure state is a headless component.

Use uniComponent API.

Object props:

import { uniComponent, classNames, UniNode } from '@uni-component/core'

const UniXxYy = uniComponent('uni-xx-yy', {
  type: {
    type: String as PropType<'button' | 'submit' | 'reset'>,
    default: 'button'
  },
  text: String,
  icon: String,
  primary: Boolean,
  onClick: Function as PropType<(e?: MouseEvent) => any>,
  xxRender: Function as PropType<(param: {}) => UniNode | undefined>,
}, (name, props, context) => {
  // name is 'UniXxYy'
  const n = ref(0)

  const rootClass = computed(() => {
    return {
      [`${name}-primary`]: props.primary
    }
  })
  // other class you should always use classNames
  const otherClass = computed(() => {
    return classNames({
      [`${name}-child-xx`]: props.type === 'reset'
    })
  })

  const clickAction = (e?: MouseEvent) => {
    n.value += 1
    // do others
    props.onClick && props.onClick(e)
  }

  return {
    n,
    rootClass,
    clickAction
  }
})

Notice: xxRender prop will be treated as render function(React - render function, vue - scope slot)

Array props:

const UniXxYy = uniComponent('uni-xx-yy', ['a', 'b'], (name, props, context) => {
  // name is 'UniXxYy'
  // props.a and props.b can be any value
  // ...
  return {
    // ...
  }
})

No props:

const UniXxYy = uniComponent('uni-xx-yy', (name, props, context) => {
  // name is 'UniXxYy'
  // ...
  return {
    // ...
  }
})

About context param

{
  // renders contained all `xxRender` in props
  // renders.defaultRender() is used to replace `props.children` in react and `slots.default` in vue
  renders: Record<string, (...args: any[]) => any>
  // all element attrs, no ref and key
  attrs: Record<string, any>
  // element attrs without `class, style, id`
  $attrs: Record<string, any>
  // original props setted by usage case
  // without default props
  nodeProps?: Record<string, any> | null
}

Define platform component

This is optional.

Use uni2Platform(UniComponent, render: (props, state, context) => UniNode | undefined) API.

UniComponent headless component, the uniComponent() result

render() pure render function.

About state param

{
  rootClass: string,
  rootStyle: {[key: string]: 'string value'},
  rootId: string | undefined
  // other state with your custom state
  // n,
  // xxAction,
  //...
}

Demo:

// platform component with pure render function
const XxYy = uni2Platform(UniXxYy, (props, state, { renders }) => {
  const { type, text } = props
  // rootClass always contain Component name, like 'uni-xx-yy'
  const { rootClass, rootStyle, rootId, n, clickAction } = state
  const t = text ? text : (renders.defaultRender && renders.defaultRender())
  return (
    <button id={rootId} class={rootClass} style={rootStyle} type={type} onClick={clickAction}>
      <span>{ t } { n }</span>
    </button>
  )
})

Reference a DOM element or Component

Use useRef API and ref attribute.

import { useRef } from '@uni-component/core'
const UniXxYy = uniComponent('uni-xx-yy', (name) => {
  // name is 'UniXxYy'
  const ele = ref<HTMLElement>()
  const setEleRef = useRef(ele)

  // buttonComponent will be the state of CubeButton
  // defined in UniButton
  const buttonComponent = ref<{
    n: number,
    clickAction: (e?: MouseEvent) => void
  }>()
  const setButtonComponentRef = useRef(buttonComponent)
  return {
    setEleRef,
    setButtonComponentRef,
  }
})

render:

const XxYy = uni2Platform(UniXxYy, (props, state) => {
  const { setEleRef, setButtonComponentRef } = state
  return (
    <div ref={setEleRef}>
      <CubeButton ref={setButtonComponentRef}>xx</CubeButton>
    </div>
  )
})

Notice: The ref value will be this component's state result when referenced a component

Lifecycles

Only 3 lifecycles: mounted, updated and unmounted.

import { onMounted, onUpdated, onUnmounted } from '@uni-component/core'
const UniXxYy = uniComponent('uni-xx-yy', (name) => {
  onMounted(() => {
    console.log('mounted')
  })
  onUpdated(() => {
    console.log('updated')
  })
  onUnmounted(() => {
    console.log('unmounted')
  })
  return {
    // ...
  }
})

Provide and Inject

Like vue 3 Provide / Inject.

Provide:

// parent component
import { provide } from '@uni-component/core'

const UniXxYy = uniComponent('uni-xx-yy', (name) => {
  provide('xx-key', {
    // xx: xxValue
    // ...
  })
  return {
    // ...
  }
})

Inject:

// child component
import { inject } from '@uni-component/core'

const UniXxYyChild = uniComponent('uni-xx-yy-child', (name) => {
  // const xxProvide = inject('xx-key')
  // with default value
  const xxYyProvideValue = inject('xx-key', {
    // xx: defaultValue
    // ...
  })
  return {
    // ...
  }
})

Other API

classNames(), process element class names. Same as classnames.
const mergedStyle = mergeStyle(stringStyle, objectStyle, ...(string or object styles)), merge styles. mergedStyle is an object.