vue-eventer

Vue.js tool known as event bus or even hub usefull for small projects. Vue 3.x has a lot of breaking changes including removed $on, $off and $once methods so goodbye native event bus. Using this tool you can have the same code for event bus in Vue 2.x and Vue 3.x projects.

Install

To install with npm or yarn, use

npm install --save vue-eventer

// or

yarn add vue-eventer

Methods

Methods are compatible with Vue 2.x methods so you can easily switch from native event bus Vue.prototype.$eventBus = new Vue() to this tool Vue.prototype.$eventBus = new VueEventer() with no additonal code changes. Later you can again easily switch from Vue 2.x to Vue 3.x.

$on(event, callback)

Adds listener for the event. The callback will receive all the additional arguments passed into $emit() method. You can also use alias method on(). Do no forget to always remove listeners in components which can be removed to avoid memory leaks!

$once(event, callback)

Adds one-time listener for the event. The callback will receive all the additional arguments passed into $emit() method. The listener will be removed once it triggers for the first time. You can also use alias method once(). Do not forget to always remove listeners in components which can be removed to avoid memory leaks!

$off(event, callback)

Removes listener for the event. You can also use alias method off().

$emit(event, [...args])

Emits event with or without any arguments. Any additional arguments will be passed into the listener’s callback function. You can also use alias method emit().

Usage

////////// JS for Vue 2.x \\\\\\\\\\

import Vue from 'vue';
import VueEventer from 'vue-eventer';

Vue.prototype.$eventBus = new VueEventer();

const App = new Vue({
    el: '#app',

    created() {
        this.$eventBus.$on('do-sth', this.waitForSomething);
    },

    beforeDestroy() {
        this.$eventBus.$off('do-sth', this.waitForSomething);
    },

    methods : {
        waitForSomething(a, b) {
            console.log(a, b);
        },

        triggerSomething() {
            // this.$eventBus.$emit('do-sth', 123);
            // this.$eventBus.$emit('do-sth', 123, 456);
            // this.$eventBus.$emit('do-sth', { x : 1, y : 2 });
        },
    },
});

////////// JS for Vue 3.x \\\\\\\\\\

import * as Vue from 'vue';
import VueEventer from 'vue-eventer';

const App = Vue.createApp({
    created() {
        this.$eventBus.$on('do-sth', this.waitForSomething);
    },

    beforeUnmount() {
        this.$eventBus.$off('do-sth', this.waitForSomething);
    },

    methods : {
        waitForSomething(a, b) {
            console.log(a, b);
        },

        triggerSomething() {
            // this.$eventBus.$emit('do-sth', 123);
            // this.$eventBus.$emit('do-sth', 123, 456);
            // this.$eventBus.$emit('do-sth', { x : 1, y : 2 });
        },
    },
});

App.config.globalProperties.$eventBus = new VueEventer();

App.mount('#app');