Provide and inject for deep passing in Vue - Mini Project: Build & Apply

Provide and Inject for Deep Passing in Vue

📖 Scenario: You are building a Vue app with nested components. You want to share a message from the top-level component to a deeply nested child without passing props through every level.

🎯 Goal: Build a Vue app that uses provide in the top component and inject in a deeply nested child component to share a message.

📋 What You'll Learn

Create a top-level component that provides a message using provide

Create a nested child component inside the top component

Create a deeply nested child component inside the nested child

Use inject in the deeply nested child to receive the message

Display the injected message in the deeply nested child component

💡 Why This Matters

🌍 Real World

In real apps, provide/inject helps share data like themes, user info, or settings across many nested components without passing props at every level.

💼 Career

Understanding provide/inject is important for Vue developers to write clean, maintainable code and manage state efficiently in component trees.

1

Set up the top-level component with a message

Create a Vue component called App with a setup function that defines a constant message with the value 'Hello from top!'.

Vue

export default {
  setup() {
    // Your code here
  }
}

Need a hint?

Use const message = 'Hello from top!' inside the setup function.

2

Provide the message from the top-level component

In the setup function of App, use Vue's provide function to provide the message with the key 'message'.

Vue

import { provide } from 'vue'

export default {
  setup() {
    const message = 'Hello from top!'
    // Your code here
    return { message }
  }
}

Need a hint?

Import provide from 'vue' and call provide('message', message) inside setup.

3

Create nested and deeply nested child components

Create two components: NestedChild and DeepNestedChild. Inside NestedChild, include <DeepNestedChild /> in the template. Register both components in App and use <NestedChild /> inside App's template.

Vue

  



import { provide } from 'vue'

const DeepNestedChild = {
  template: 'Deep Nested Child'
}

const NestedChild = {
  components: { DeepNestedChild },
  template: 'Nested Child '
}

export default {
  components: { NestedChild },
  setup() {
    const message = 'Hello from top!'
    provide('message', message)
    return { message }
  }
}

Need a hint?

Define DeepNestedChild and NestedChild components with templates. Nest DeepNestedChild inside NestedChild. Use <NestedChild /> in App's template.

4

Inject the message in the deeply nested child and display it

In DeepNestedChild, use Vue's inject function to get the message provided by App. Display the injected message inside the template.

Vue

  



import { provide, inject } from 'vue'

const DeepNestedChild = {
  setup() {
    // Your code here
  },
  template: '{{ message }}'
}

const NestedChild = {
  components: { DeepNestedChild },
  template: 'Nested Child '
}

export default {
  components: { NestedChild },
  setup() {
    const message = 'Hello from top!'
    provide('message', message)
    return { message }
  }
}

Need a hint?

Import inject from 'vue'. Use const message = inject('message') inside DeepNestedChild's setup. Show {{ message }} in the template.