Exploring the differences between this.$emit and this.$root.$emit in Vue.js: a guide to best practices

My Vue2 components are dynamically added and removed using v-if. Sometimes, I need to communicate between these components by using $emit in the sender and $on in the receiver.

I have been utilizing this.$root.$emit to broadcast custom events and this.$root.$on to manage these events. However, I recently discovered that using this.$root.$on necessitates calling this.$root.$off (usually from beforeDestroy) to prevent issues if the removed component attempts to handle the event.

These revelations have led me to two questions:

  1. What is the distinction between this.$root.$emit and this.$emit?
  2. If I utilize this.$on, must I also use this.$off, or will the handler automatically deactivate when the component is removed?

Answer №1

  1. Is there a difference between using this.$root.$emit and this.$emit in Vue.js?

this.$root accesses the root component instance, typically App.vue, allowing this.$root.emit to emit an event from the root component.

this.$emit specifically emits an event from the current component.

  1. When using this.$on, is it necessary to also use this.$off? Or does the handler automatically get deactivated when the component is removed?

No need for this.$off. The handler will be automatically removed once the component is destroyed.

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