Event Bus

Introduction#

Event buses are a useful way of communicating between components which are not directly related, i.e. Have no parent-child relationship.

It is just an empty vue instance, which can be used to $emit events or listen $on the said events.

Syntax#

export default new Vue()

Remarks#

Use vuex if your application has a lot of components requiring the data of each other.

eventBus

// setup an event bus, do it in a separate js file
var bus = new Vue()

// imagine a component where you require to pass on a data property
// or a computed property or a method!

Vue.component('card', {
  template: `<div class='card'>
    Name: 
      <div class='margin-5'>
          <input v-model='name'>
    </div>
    <div class='margin-5'>
      <button @click='submit'>Save</button>
    </div>
  </div>`,
  data() {
    return {
      name: null
    }
  },
  methods: {
    submit() {
      bus.$emit('name-set', this.name)
    }
  }
})

// In another component that requires the emitted data.
var data = {
  message: 'Hello Vue.js!'
}

var demo = new Vue({
  el: '#demo',
  data: data,
  created() {
    console.log(bus)
    bus.$on('name-set', (name) => {
      this.message = name
    })
  }
})