关于vue3:vue3-ts-获取组件-ref-实例

在 vue3 中获取组件的类型：

type EleForm = InstanceType<typeof ElForm>

在template中获取组件的ref

<template>
  <ElForm ref="$form"></ElForm>
</template>

<script lang="ts">
import { Options, Vue } from 'vue-class-component'
import { ElForm } from 'element-plus'

@Options<Home>({
  components: {
    ElForm,
  },

})
export default class Home extends Vue {
  $form = ref<InstanceType<typeof ElForm>>(null)
  
  mounted() {
      this.$form?.value // 类型正确
  }
}
</script>

tsx等render组件中获取的形式更简略

import { defineComponent, ref, onMounted } from '@vue/runtime-core'
import { ElForm } from 'element-plus'


export default defineComponent({

    setup() {
    
        const $form = ref<InstanceType<typeof ElForm>>(null)
        
        onMounted(() => {
            $form?.value // 类型正确
        })
        
        return () => 
            <ElForm ref={$form}></ElForm>
    }

})

须要留神的是，如果应用expose裸露办法进来，无奈获取到对应的类型，您须要自定义类型
https://github.com/vuejs/rfcs…

// 组件 MyForm
import { defineComponent, ref, onMounted } from '@vue/runtime-core'
import { ElForm } from 'element-plus'

type ELEForm = InstanceType<typeof ElForm>


// 在外界通过 ref 获取组件实例 请应用这个类型
export interface MyFormExpose {
  validate: ELEForm['validate'];
}

export default defineComponent({
    name: 'MyForm',

    setup(props, { expose }) {
    
        const $form = ref<InstanceType<typeof ElForm>>(null)
        
        expose({
          validate: (callback) => $form?.value?.validate(callback),
        } as MyFormExpose)
        
        return () => 
            <ElForm ref={$form}></ElForm>
    }

})

<!-- Home.vue -->
<template>
  <MyForm :ref="$form" />
</template>

<script>
import { defineComponent, ref, onMounted } from '@vue/runtime-core'
import MyForm, { MyFormExpose } from '@/components/MyForm'
export default defineComponent({
  components: { MyForm }
  
  setup(){
    const $form = ref<InstanceType<typeof MyForm> & MyFormExpose>(null)
    
    onMounted(() => {
       $form?.value.validate // 类型正确
    })
  }
})
</script>