在Vue.js中从父组件执行子方法 [英] Executing child method from parent component in Vue.js

问题描述

目前，我有一个Vue.js组件，其中包含其他组件的列表。我知道使用vue的常用方法是将数据传递给子节点，并从子节点向父节点发送事件。

Currently, I have a Vue.js components which contains a list of other components. I know that the common way of working with vue is passing data to children, and emitting events to parents from children.

但是，在这种情况下我想执行一个方法单击父级中的按钮时，在子组件中。这是最好的方法吗？

However, in this case I want to execute a method in the children components when a button in the parent is clicked. Which would be the best way to do it?

推荐答案

一种建议的方法是使用全球事件中心。这允许可以访问集线器的任何组件之间的通信。

One suggested way is to use a global event hub. This allows communication between any components that have access to the hub.

这是一个示例，显示如何使用事件中心来触发子组件上的方法。

Here is an example showing how an event hub can be used to fire a method on a child component.

var eventHub = new Vue();

Vue.component('child-component', {
  template: "<div>The 'clicked' event has been fired {{count}} times</div>",
  data: function() {
    return {
      count: 0
    };
  },
  methods: {
    clickHandler: function() {
      this.count++;
    }
  },
  created: function() {
    // We listen for the event on the eventHub
    eventHub.$on('clicked', this.clickHandler);
  }
});

new Vue({
  el: '#app',
  methods: {
    clickEvent: function() {
      // We emit the event on the event hub
      eventHub.$emit('clicked');
    }
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.1.3/vue.js"></script>

<div id="app">
  <button @click="clickEvent">Click me to emit an event on the hub!</button>
  <child-component></child-component>
</div>

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