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Detailed explanation of event bus non-parent-child component communication in vue

小云云Original: 2018-01-02 10:16:062372browse

This article mainly introduces the communication analysis of event bus non-parent-child components in vue. The editor thinks it is quite good. Now I will share it with you and give it a reference. Let’s follow the editor to take a look, I hope it can help everyone.

Sometimes components with non-parent-child relationships also need to communicate. In simple scenarios, use an empty Vue instance as the central event bus:

var bus = new Vue()
// 触发组件 A 中的事件
bus.$emit(&#39;id-selected&#39;, 1)
// 在组件 B 创建的钩子中监听事件
bus.$on(&#39;id-selected&#39;, function (id) {
 // ...
})

In more complex cases, you should consider using a dedicated state management pattern .Is using vuex

eventBus is used as a communication intermediary between components in a sibling relationship.

Code example:

<!DOCTYPE html>
<html>
<head>
<title>eventBus</title>
<script src="http://cdn.jsdelivr.net/vue/1.0.28/vue.min.js"></script>
</head>
<body>
<p id="todo-app">
<h1>todo app</h1>
<new-todo></new-todo>
<todo-list></todo-list>
</p>
<script>
var eventHub = new Vue( {
data(){
return{
todos:[&#39;A&#39;,&#39;B&#39;,&#39;C&#39;]
}
},
created:function () {
this.$on(&#39;add&#39;, this.addTodo)
this.$on(&#39;delete&#39;, this.deleteTodo)
},
beforeDestroy:function () {
this.$off(&#39;add&#39;, this.addTodo)
this.$off(&#39;delete&#39;, this.deleteTodo)
},
methods: {
addTodo: function (newTodo) {
this.todos.push(newTodo)
},
deleteTodo: function (i) {
this.todos.splice(i,1)
}
}
})
var newTodo = {
template:`<p><input type="text" autofocus v-model="newtodo"/><button @click="add">add</button></p>`,
data(){
return{
newtodo:&#39;&#39;
}
},
methods:{
add:function(){
eventHub.$emit(&#39;add&#39;, this.newtodo)
this.newtodo = &#39;&#39;
}
}
}
var todoList = {
template:`<ul><li v-for="(index,item) in items">{{item}} \
     <button @click="rm(index)">X</button></li> \
     </ul>`,
     data(){
     return{
     items:eventHub.todos
     }
     },
     methods:{
     rm:function(i){
     eventHub.$emit(&#39;delete&#39;,i)
     }
     }
}
var app= new Vue({
el:&#39;#todo-app&#39;,
components:{
newTodo:newTodo,
todoList:todoList
}
})
</script>
</body>
</html>

The rendering is as follows:

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