A component designed to capture and respond to events triggered by its child elements

Question

A component designed to capture and respond to events triggered by its child elements

I have recently delved into the world of vuejs and discovered that in order to send data from a child component back to its parent, we can use

this.$root.$emit('name-of-event', myobject);

The parent component can then receive this data by using this.$root.$on('name-of-event');

However, in another vuejs project I'm working on for comparison purposes, I noticed that the component listening to the event is not always the direct parent. The component triggering the event doesn't necessarily need to be rendered within the same component listening to it.

This made me wonder: does the listener for emitted events always have to be the direct parent? Is it possible for other components to listen to these events as well?

myAcomponent.vue :

    updateDate(value) {

 //body of updateDate method
            this.$root.$emit('date-updated', this.project);
          
    }

myBcomponent.vue :

<script>
      created() {
        this.$root.$on('date-updated', project => {
          this.updateproject(project);
        });
     }
</script>

<template>
//no call in template for myAcomponent
</template>

javascript vue.js events vuejs2

Answer 1

Answer №1

Does the direct parent always listen to the triggered event? - In most cases, yes. However, there are exceptions where other solutions may be necessary :

If you are dealing with a large application and need to share data among multiple components that are not directly related, utilizing a state management solution is recommended. One option is using Pinia, which is endorsed by the Vue core team.
If you only need to share data between sibling components under the same parent, consider this approach:
- Send data from one child component to the parent using an event emitter.
- In the parent component, capture the event and pass the data to another child component using props.

Answer 2

Does the direct parent always listen to the triggered event? - In most cases, yes. However, there are exceptions where other solutions may be necessary :

If you are dealing with a large application and need to share data among multiple components that are not directly related, utilizing a state management solution is recommended. One option is using Pinia, which is endorsed by the Vue core team.
If you only need to share data between sibling components under the same parent, consider this approach:
- Send data from one child component to the parent using an event emitter.
- In the parent component, capture the event and pass the data to another child component using props.

Answer 3

Answer №2

If you're looking to enhance event emission, there's a more efficient approach

Imagine you have components A and B that need to exchange data without a direct relationship

1. Create a JavaScript file and include the code below, then save it as FileName.js

 import Vue from 'vue';
    export const EventBus = new Vue();

2. In component A.vue, emit the event in methods or during an API call

import {EventBus} from "path/FIleName.js";

 update(data){
    EventBus.$emit("event-name",Data);
     }

3. Finally, listen for the event in component B.vue, where you want to receive the data and perform a specific action

import {EventBus} from "@/service/EventBus.js";
 created() {
    EventBus.$on("gallery-created",(Data) =>{
      this.MyFunction(Data);
    })
  },

This method using event bus allows you to easily pass events and data between components.

Answer 4

If you're looking to enhance event emission, there's a more efficient approach

Imagine you have components A and B that need to exchange data without a direct relationship

1. Create a JavaScript file and include the code below, then save it as FileName.js

 import Vue from 'vue';
    export const EventBus = new Vue();

2. In component A.vue, emit the event in methods or during an API call

import {EventBus} from "path/FIleName.js";

 update(data){
    EventBus.$emit("event-name",Data);
     }

3. Finally, listen for the event in component B.vue, where you want to receive the data and perform a specific action

import {EventBus} from "@/service/EventBus.js";
 created() {
    EventBus.$on("gallery-created",(Data) =>{
      this.MyFunction(Data);
    })
  },

This method using event bus allows you to easily pass events and data between components.

A component designed to capture and respond to events triggered by its child elements

Answer №1

Answer №2

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