Ways to access a particular property of a child component object from the parent component

Is there a way to access a child component's "meta" property from the parent component without using the emit method?

I am aware of the solution involving an emit method, but I'm curious if there is a simpler approach to achieving this.

// Default.vue <-- parent component
<template>
  <h1>{{ pagetitle }}</h1>
  <router-view />
</template>

<script>
import { defineComponent } from 'vue'

export default defineComponent({
  name: 'LayoutDefault',
  
  computed: {
    pagetitle () {
      let title = this.$route.meta.title // <-- Looking to access the child component's meta here

      // If title is not provided, set to empty string
      if (!title) title = ''

      return title
    }
  }
})
</script>
// router/routes.js
const routes = [
  {
    path: '/',
    component: () => import('layouts/Default.vue'),
    children: [
      {
        path: 'dashboard',
        name: 'dashboard', 
        meta: { title: 'Dashboard', auth: true, fullscreen: false }, // <-- NEED THIS
        component: () => import('pages/dashboard.vue')
      }
    ]
  }
]
// pages/dashboard.vue <-- child component
<template>
  <div>
    dashboard content
  </div>
</template>

<script>
import { defineComponent } from 'vue'

export default defineComponent({
  name: 'Dashboard',
  meta: { // <-- Should be accessible from the parent component (Default.vue)
    title: 'Dashboard',
    auth: true,
    fullscreen: false
  }
})
</script>

Answer №1

If you need to access component information, you can utilize the $route.matched property.

Take a look at this Proof of Concept:

const Dashboard = Vue.defineComponent({
  template: "<div>Some dashboard</div>",
  meta: { title: "Dashboard" },
})

const router = new VueRouter({
  routes: [{ path: "/", component: Dashboard }],
})

const app = new Vue({
  router,

  computed: {
    // It's important to note that this retrieves the *last* matched component, as there may be multiple matches
    childComponent: (vm) => vm.$route.matched.at(-1).components.default,
  },
}).$mount('#app')
<div id="app">
  <h1>{{ childComponent.meta.title }}</h1>
  <router-view />
</div>

<script src="https://unpkg.com/vue@2/dist/vue.js"></script>
<script src="https://unpkg.com/vue-router@3/dist/vue-router.js"></script>


As Estus Flash suggested in a comment, instead of selecting the last matched component, we can choose the last one with defined meta. To achieve this, replace the following line:

vm.$route.matched.at(-1).components.default

with:

vm.$route.matched.findLast((r) => "meta" in r.components.default)
    .components.default

Answer №2

After researching online, I came across a few different methods for accessing data from child components in VueJS:

  1. One approach is to use ref and access the data using this.$refs.REF_NAME.$data (An example can be found here: )

  2. Another option is to utilize Vuex or duplicate the logic behind stores (An example of this can be seen here: )

Source: VueJS access child component's data from parent

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