An effective way to utilize the h() function in Vuejs to render a component instance

Question

An effective way to utilize the h() function in Vuejs to render a component instance

I'm currently working on a Vuejs component setup that resembles the following structure:

<template>
  <button @click="generateItem()">Add item</button>
  <div class="container"></div>
</template>

<script setup>
  import { h } from 'vue'
  import MyItem from '@/components/MyItem.vue'

  function generateItem(){
    return h(MyItem)
  }
</script>

My goal is to utilize the h() function to render an instance of MyItem within the div.container when executing the generateItem() function. However, despite referencing the official Vuejs documentation on the h() function, I'm unsure of how to achieve this. Any insights or suggestions on how I can accomplish this task?

javascript vue.js

Answer 1

Answer №1

Implement the use of v-for based on your requirements:

Custom Playground

<template>
  <button @click="generateItem()">Add item</button>
  <div class="container">
    <my-item v-for="item in items">{{ item }}</my-item>
  </div>
</template>

<script setup>
  import { reactive } from 'vue'
  import MyItem from './MyItem.vue'
  const items = reactive([]);
  let counter = 1;
  function generateItem(){
    items.push('Item ' + counter++)
  }
</script>

Answer 2

Implement the use of v-for based on your requirements:

Custom Playground

<template>
  <button @click="generateItem()">Add item</button>
  <div class="container">
    <my-item v-for="item in items">{{ item }}</my-item>
  </div>
</template>

<script setup>
  import { reactive } from 'vue'
  import MyItem from './MyItem.vue'
  const items = reactive([]);
  let counter = 1;
  function generateItem(){
    items.push('Item ' + counter++)
  }
</script>

Answer 3

Answer №2

It is my understanding that the render function should not be used in conjunction with <script setup>. Instead, it serves as a flexible option for programmatically declaring your render function, rather than utilizing a template within a Vue SFC.

That being said, you can render a dynamically generated item like this:

<script setup>
  import { h, ref, shallowRef } from 'vue'
  import MyItem from './MyItem.vue'

  const component = shallowRef(null)
  function generateItem(){
    component.value = MyItem
  }
</script>

<template>
  <button @click="generateItem()">Add item</button>
  <div class="container">
    <component v-if="component" :is="component" :testStr="'The test str from App.vue'"></component>
  </div>
</template>

(you can view this in action on the playground url: Vue SFC Playground)

You can also achieve the same result by wrapping it with h(), though I consider it to be unnecessary:

component.value = h(MyItem)

Answer 4

It is my understanding that the render function should not be used in conjunction with <script setup>. Instead, it serves as a flexible option for programmatically declaring your render function, rather than utilizing a template within a Vue SFC.

That being said, you can render a dynamically generated item like this:

<script setup>
  import { h, ref, shallowRef } from 'vue'
  import MyItem from './MyItem.vue'

  const component = shallowRef(null)
  function generateItem(){
    component.value = MyItem
  }
</script>

<template>
  <button @click="generateItem()">Add item</button>
  <div class="container">
    <component v-if="component" :is="component" :testStr="'The test str from App.vue'"></component>
  </div>
</template>

(you can view this in action on the playground url: Vue SFC Playground)

You can also achieve the same result by wrapping it with h(), though I consider it to be unnecessary:

component.value = h(MyItem)

An effective way to utilize the h() function in Vuejs to render a component instance

Answer №1

Answer №2

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