How to implement non-parent-child component communication in Vue?

Vue is a popular JavaScript framework for building user interfaces. During the development of Vue, component communication is an important topic. Vue provides a variety of ways to implement communication between components, including parent-child component communication, sibling component communication, and non-parent-child component communication. This article will focus on how to implement non-parent-child component communication in Vue and provide corresponding code examples.

In Vue, non-parent-child component communication can be achieved through event bus, vuex and provide/inject. The implementation of each method will be introduced in detail below.

1. Event Bus(Event Bus)
   Event Bus is a way to implement component communication through a central event manager. In Vue, you can use a Vue instance as an event bus to send and receive events. The specific steps are as follows:

(1) Create an event bus instance:

// EventBus.js
import Vue from 'vue'
export const EventBus = new Vue()

(2) In the component that sends the event, use the $emit method to send the event:

// ComponentA.vue
import { EventBus } from './EventBus.js'
export default {
  methods: {
    handleClick() {
      EventBus.$emit('event-name', eventData)
    }
  }
}

(3) In the component that receives the event, use the $on method to listen for the event:

// ComponentB.vue
import { EventBus } from './EventBus.js'
export default {
  mounted() {
    EventBus.$on('event-name', (eventData) => {
      // 处理事件
    })
  }
}

2. vuex
   vuex is the official state management library of Vue, providing centralized storage management Mechanism for state of all components of an application. Components can share state and implement non-parent-child component communication through vuex. The specific steps are as follows:

(1) Install and configure vuex:

npm install vuex

// store.js
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    count: 0
  },
  mutations: {
    increment(state) {
      state.count++
    }
  },
  actions: {
    increment(context) {
      context.commit('increment')
    }
  }
})

(2) In components that need to share state, use mapState, mapMutations and mapActions to obtain and modify state ：

// ComponentA.vue
import { mapState, mapMutations } from 'vuex'
export default {
  computed: {
    ...mapState(['count'])
  },
  methods: {
    ...mapMutations(['increment'])
  }
}

// ComponentB.vue
import { mapState, mapActions } from 'vuex'
export default {
  computed: {
    ...mapState(['count'])
  },
  methods: {
    ...mapActions(['increment'])
  }
}

3. provide/inject
   provide/inject is a new non-parent-child component communication method introduced in Vue2.2.0 version. The purpose of passing data from the parent component to the descendant components is achieved through the provide option and the inject option. The specific steps are as follows:

(1) In the parent component, use the provide option to provide data:

// ParentComponent.vue
export default {
  provide() {
    return {
      dataName: this.data
    }
  },
  data() {
    return {
      data: 'some data'
    }
  }
}

(2) In the child component, use the inject option to inject data:

// ChildComponent.vue
export default {
  inject: ['dataName']
}

The above are several ways to implement non-parent-child component communication in Vue, and corresponding code examples are provided. Choosing the appropriate method to implement component communication based on actual needs can improve the maintainability and scalability of the code. I hope this article can help you understand and apply Vue component communication.

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