h function for creating vnodes in Vue - Mini Project: Build & Apply

Using the h Function to Create VNodes in Vue

📖 Scenario: You are building a simple Vue 3 component that displays a greeting message using the h function to create virtual nodes (vnodes).

🎯 Goal: Build a Vue 3 component using the h function to create a <div> element containing a <h1> heading with the text "Hello, Vue!".

📋 What You'll Learn

Create a Vue 3 component using `defineComponent`.

Use the h function from Vue to create virtual nodes.

Render a <div> element as the root with an <h1> child containing the text "Hello, Vue!".

Do not use template syntax; use only the h function for rendering.

💡 Why This Matters

🌍 Real World

Using the h function is useful when you want to create Vue components programmatically without templates, such as in render functions or JSX alternatives.

💼 Career

Understanding how to create virtual nodes with the h function helps you build flexible Vue components and is a key skill for advanced Vue development and custom render logic.

1

Setup Vue Component and Import h

Create a Vue 3 component by importing defineComponent and h from 'vue'. Then define a component named HelloVue using defineComponent.

Vue

import { defineComponent, h } from 'vue'

// Your code here

Hint

Start by importing defineComponent and h from 'vue'. Then create a component with defineComponent and give it the name HelloVue.

2

Add a Render Function Using h

Inside the HelloVue component, add a render function that returns a virtual node created by h. For now, return a <div> element with no children.

Vue

import { defineComponent, h } from 'vue'

export default defineComponent({
  name: 'HelloVue',
  render() {
    // Your code here
  }
})

Hint

Define a render method that returns h('div') to create an empty <div> element.

3

Add an <h1> Child with Text

Modify the render function to return a <div> element with one child: an <h1> element containing the text "Hello, Vue!". Use h to create both elements and nest the <h1> inside the <div>.

Vue

import { defineComponent, h } from 'vue'

export default defineComponent({
  name: 'HelloVue',
  render() {
    // Your code here
  }
})

Hint

Use h('div', [h('h1', 'Hello, Vue!')]) to create a <div> with an <h1> child containing the text.

4

Export the Component as Default

Ensure the HelloVue component is exported as the default export so it can be used in a Vue app.

Vue

import { defineComponent, h } from 'vue'

// Your code here

Hint

Make sure the component is exported with export default defineComponent.