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How event bus non-parent-child components communicate with each other

php中世界最好的语言Original: 2018-04-16 14:25:221323browse

This time I will show you how event bus non-parent and child components communicate with each other. What are the precautions for event bus non-parent and child components to communicate with each other? Here is a practical case, let’s take a look.

Sometimes components that are not in a parent-child relationship also need to communicate. In a simple scenario, use an empty Vue instance as the central Event bus:

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

In more complex cases, you should consider using a dedicated state management mode. That is using vuex

eventBus is a communication intermediary between components that act as brothers.

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:['A','B','C']
}
},
created:function () {
this.$on('add', this.addTodo)
this.$on('delete', this.deleteTodo)
},
beforeDestroy:function () {
this.$off('add', this.addTodo)
this.$off('delete', 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:''
}
},
methods:{
add:function(){
eventHub.$emit('add', this.newtodo)
this.newtodo = ''
}
}
}
var todoList = {
template:`<ul><li v-for="(index,item) in items">{{item}} \
     <button @click="rm(index)">X</button></li> \
     </ul>`,
     data(){
     return{
     items:eventHub.todos
     }
     },
     methods:{
     rm:function(i){
     eventHub.$emit('delete',i)
     }
     }
}
var app= new Vue({
el:'#todo-app',
components:{
newTodo:newTodo,
todoList:todoList
}
})
</script>
</body>
</html>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

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