What is the best way for a parent component to establish communication with a child component in a Vue.js application

Question

What is the best way for a parent component to establish communication with a child component in a Vue.js application

Here is the existing code snippet:

<div id='vnav-container'>
    <input type="text" v-model="searchTerm" v-on:keyup="search" class="vnav-input">
    <menu :items="menu"></menu>
</div>

The main component features a search input and a menu component.

When a user performs a search within the main component, I need to trigger a method in the menu component, or emit an event, or some other method of communication to instruct the menu component to filter itself based on the new criteria.

I have come across suggestions that directly calling methods on child components is discouraged, and instead events should be used. I am currently reviewing the documentation, but so far I have only found examples of parent-child communication, not the reverse.

What is the best approach for communicating with the menu component as the search criteria changes?

UPDATE

Some blog posts mention a now-missing $broadcast method designed for communicating with child components. However, information about this feature has seemingly disappeared from the documentation. The previous URL for reference was: http://vuejs.org/api/#vm-broadcast

javascript vue.js

Answer 1

Answer №1

The principle followed is "props down, events up". Information moves from parent components to child components using props. For example, you can include a prop in the menu component like this:

<menu :items="menu" :searchTerm="searchTerm"></menu>

The filtering mechanism (possibly computed) would rely on the searchTerm, updating whenever it changes.

In cases where a system of components grows complex, transmitting data through multiple layers can become cumbersome, leading to the use of a centralized store.

Answer 2

The principle followed is "props down, events up". Information moves from parent components to child components using props. For example, you can include a prop in the menu component like this:

<menu :items="menu" :searchTerm="searchTerm"></menu>

The filtering mechanism (possibly computed) would rely on the searchTerm, updating whenever it changes.

In cases where a system of components grows complex, transmitting data through multiple layers can become cumbersome, leading to the use of a centralized store.

Answer 3

Answer №2

A change in version 2.x led to the deprecation of $broadcast. Check out the Migration guide for suggestions on how to replace this functionality, such as using event hubs or the library Vuex.

Answer 4

A change in version 2.x led to the deprecation of $broadcast. Check out the Migration guide for suggestions on how to replace this functionality, such as using event hubs or the library Vuex.

Answer 5

Answer №3

If you're looking to set up a simple store, here's how you can do it.

To begin with, create a new file named searchStore.js. This file will consist of a VanillaJS Object like this:

export default {

    searchStore: { 
        searchTerm: '' 
    } 

}

Next, in the files where you intend to use this store, import it as follows:

import Store from '../storedir/searchStore'

In your component where data filtering is needed, initialize a data object referencing the shared store:

data() {
   return {
      shared: Store.searchStore
   }
}

Regarding methods, you can add a method in your store like so:

doFilter(param) {
  // Implement logic here
}

Then, within your component, you can call this method as shown below:

methods: {
   search() {
      Store.doFilter(param)
   }
}

It's worth noting that $broadcast and $dispatch are no longer supported in VueJS 2.0.

Answer 6

If you're looking to set up a simple store, here's how you can do it.

To begin with, create a new file named searchStore.js. This file will consist of a VanillaJS Object like this:

export default {

    searchStore: { 
        searchTerm: '' 
    } 

}

Next, in the files where you intend to use this store, import it as follows:

import Store from '../storedir/searchStore'

In your component where data filtering is needed, initialize a data object referencing the shared store:

data() {
   return {
      shared: Store.searchStore
   }
}

Regarding methods, you can add a method in your store like so:

doFilter(param) {
  // Implement logic here
}

Then, within your component, you can call this method as shown below:

methods: {
   search() {
      Store.doFilter(param)
   }
}

It's worth noting that $broadcast and $dispatch are no longer supported in VueJS 2.0.

What is the best way for a parent component to establish communication with a child component in a Vue.js application

Answer №1

Answer №2

Answer №3

Similar questions

Having trouble with button functionality following the implementation of jquery.min.js?

Shifting a div from side to side

"Utilizing multiple optional parameters in Expressjs can lead to the request handler being

Double Assignment in JavaScript

Retrieve the id of the anchor tag that was selected upon clicking, and then dynamically change the content of another div

The Checkbox generated by Javascript is failing to properly close the tag

Set a point at specific coordinates on a 3D object model using Three.js

Grouping JSON data in Javascript, such that multiple fields are returned within the parent object

Having trouble parsing multiple JSON rows in JavaScript

The Vue component appears to be missing from the HTML code

The margin persists despite the usage of the * selector and !important declaration

What distinguishes a WAV file recorded from a user's microphone versus a WAV file imported from a separate file? Identifying the unique characteristics that may be causing bugs

Issue with Jquery button click event not triggering

Converting information from one form to another using Typescript

The keyframes animation for the navigation bar will not restart from a different location

Deciphering arrays from javascript with PHP

Combating React SetState Race Conditions with the Power of Promise.all

Just starting out with Angular - facing issues with setting up in eclipse

Is my Laravel application experiencing caching issues preventing real-time updates?

The response from Ajax is being duplicated with each click