Function h()

Creates virtual DOM nodes (vnodes)

Type

// full signature
function h(
  type: string | Component,
  props?: object | null,
  children?: Children | Slot | Slots
): VNode

// omitting props
function h(type: string | Component, children?: Children | Slot): VNode

type Children = string | number | boolean | VNode | null | Children[]

type Slot = () => Children

type Slots = { [name: string]: Slot }

Example

Creating native elements:

import { h } from 'vue'

// all arguments except the type are optional
h('div')
h('div', { id: 'foo' })

// both attributes and properties can be used in props
// Vue automatically picks the right way to assign it
h('div', { class: 'bar', innerHTML: 'hello' })

// class and style have the same object / array
// value support like in templates
h('div', { class: [foo, { bar }], style: { color: 'red' } })

// event listeners should be passed as onXxx
h('div', { onClick: () => {} })

// children can be a string
h('div', { id: 'foo' }, 'hello')

// props can be omitted when there are no props
h('div', 'hello')
h('div', [h('span', 'hello')])

// children array can contain mixed vnodes and strings
h('div', ['hello', h('span', 'hello')])

Creating components:

import Foo from './Foo.vue'

// passing props
h(Foo, {
  // equivalent of some-prop="hello"
  someProp: 'hello',
  // equivalent of @update="() => {}"
  onUpdate: () => {}
})

// passing single default slot
h(Foo, () => 'default slot')

// passing named slots
// notice the `null` is required to avoid
// slots object being treated as props
h(MyComponent, null, {
  default: () => 'default slot',
  foo: () => h('div', 'foo'),
  bar: () => [h('span', 'one'), h('span', 'two')]
})