Sharing Data between Vue.js Components

There are two components in my project:

  • App.vue
  • Sidekick.vue

In the App.vue component, there is a property that needs to be accessed from Sidekick.vue

App.vue

<template>
  <div id="app">
    <p>{{ myData }}</p>
    <div class="sidebar">
      <router-view/> // The sidekick component appears here
    </div>
  </div>
</template>

<script>
export default {
  name: 'App',
  data () {
    return {
      myData: 'is just this string'
    }
  }
}
</script>

Sidekick.vue

<template>
  <div class="sidekick">
    {{ myData }}
  </div>
</template>

<script>
export default {
  name: 'Sidekick'
}
</script>

The goal is to access myData (defined in App.vue) from Sidekick.vue

An attempt was made to import App.vue within Sidekick.vue using:

Sidekick.vue (incorrect approach)

<script>
import App from '@/App'
export default {
  name: 'Sidekick',
  data () {
    return {
      myData: App.myData
    }
  }
}
</script>

Although props were considered as a solution, typically for child / parent components, the situation with Sidekick.vue being inside a div within App.vue raises questions of hierarchy. Should myData access be provided to <router-view/> somehow?

UPDATE: (illustrating relationship between App.vue and Sidekick.vue)

index.js (router configuration file)

import Vue from 'vue'
import Router from 'vue-router'
import Sidekick from '@/components/Sidekick',
import FakeComponent from '@/components/FakeComponent'

Vue.use(Router)

const router = new Router({
  routes: [
    {
      path: '/',
      redirect: '/fakecomponent'
    },
    {
      path: '/sidekick',
      name: 'Sidekick',
      component: Sidekick
    },
    {
      path: '/fakecomponent',
      name: 'FakeComponent',
      component: FakeComponent
    }
  ]
})

export default router

Sidekick.vue is rendered upon accessing /sidekick

Answer №1

Remember, it's important to follow the rule of using props for data flow in a one-way direction

Send props down, handle events up.
https://v2.vuejs.org/v2/guide/components.html#Composing-Components

Quick fix:

Implement a global event bus to communicate between your <App/> and <Sidekick/> components.

https://v2.vuejs.org/v2/guide/components.html#Non-Parent-Child-Communication

Long-term solution:

Utilize a state management library like vuex to centralize data in a global store and access it across your component tree with

import { mapState, mapMutations } from 'vuex'

Answer №2

When establishing communication between parent and child components, it is highly recommended to utilize props and events. For more information, refer to the Vue docs


If you need to manage shared state among multiple components, the preferred method is to make use of Vuex.


For simple data sharing purposes, consider using Vue observable.

Here's a basic example: Imagine you have a game where you want errors to be accessible and modifiable by various components.

errors.js

import Vue from "vue";

export const errors = Vue.observable({ count: 0 });

Component1.vue

import { errors } from 'path-of-errors.js'

export default {
  computed: {
    errors () {
      get () { return errors.count },
      set (val) { errors.count = val }
    }
  }
}

In Component1, the errors.count is reactive. So if in your template you have:

<template>
  <div>
    Errors: {{ errors }} 
    <button @click="errors++">Increase</button>
  </div>
</template>

Clicking the Increase button will result in the errors count increasing.


By importing the errors.js in another component, both components can manipulate the errors.count.


Important Note: While Vue observable API is suitable for simple data sharing, it is a powerful tool. Consider exploring its capabilities further in this article: Using Vue Observables as a State Store

Answer №3

MainComponent.vue:


<router-view data='passedData'/>

HelperComponent.vue:


export default {
  name: "HelperComponent",
  props: ["data"],
  created() {
    alert("passedData: "+this.data)
  }
}

Answer №4

When working with App.js as the Parent component and Sidekick as the Child component,

In App.js:

You will need to include Sidekick in the template and script like this:

In script:

import Sidekick from './Sidekick.vue';

In Sidekick.vue:

The 'myData' property is defined as a prop, allowing you to access it anywhere within Sidekick.

This means that you can use myData in both the template and scripts by referencing it as this.myData.

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