vue 递归组件自定义事件问题

Question

递归组件，事件只执行一次

子组件

<template>
  <ul class="tree">
    <li>
      <span v-html="data.title" @click="nodeClick(data.title)"></span>
      <m-tree v-for="(item , idx) in data.children" :data="item" :key="idx"></m-tree>
    </li>
  </ul>
</template>

<script>
  export default {
    name: 'mTree',
    props: {
      data: {
        type: Object,
        default (){
          return {}
        }
      }
    },
    methods: {
      nodeClick(title){
        this.$emit('nodeClick',title);
      }
    }
  }
</script>

父组件

<template>
  <div id="app">
    <Tree :data="data" @nodeClick="nCllick"></Tree>
  </div>
</template>

<script>
  import Tree from './components/tree.vue'
  export default {
    components: {Tree},
    name: 'app',
    data(){
      return {
        data: {
          'title': '111',
          'children': [
            {
              'title': '111 - 1'
            }, {
              'title': '111 - 2',
              'children': [
                {'title': '111 - 2 - 1'}
              ]
            }
          ]
        }
      }
    },
    methods: {
      nCllick(title){
          console.log(title)
      }
    }

  }
</script>

运行截图

我想点击每一行，都打印出当前的内容，可是只执行一次；
看其他ui库的源码，是用了循环到根实例，parent.$emit.call(parent,par);不知道具体解决方法，请大神赐教！

Answer 1

在组件中调用一下事件

<template>
  <ul class="tree">
    <li>
      <span v-html="data.title" @click="nodeClick(data.title)"></span>
      <m-tree v-for="(item , idx) in data.children" :data="item" :key="idx" @nodeClick="outClick"></m-tree>
    </li>
  </ul>
</template>

<script>
  export default {
    name: 'mTree',
    props: {
      data: {
        type: Object,
        default (){
          return {}
        }
      }
    },
    methods: {
      nodeClick(title){
        this.$emit('nodeClick',title);
      },
      outClick(title){
          this.$emit('nodeClick',title);
      }
    }
  }
</script>

Answer 2

如何调用事件？

Answer 3

你需要在组件中也注册事件:

Vue.component('mTree', {
  name: 'mTree',
  props: {
    data: {
      type: Object,
      default (){
        return {}
      }
    }
  },
  methods: {
    nodeClick(title){
        console.log('child: ' + title)
      this.$emit('nodeClick',title);
    },
    nCllick(title){
      console.log(title)
    }
  },
  template: `
  <ul class="tree">
    <li>
      <span v-html="data.title" @click="nodeClick(data.title)"></span>
      <m-tree 
          v-for="(item , idx) in data.children" 
        :data="item" :key="idx"
        @nodeClick="nCllick"
            >
      </m-tree>
    </li>
  </ul>
  `
})

new Vue({
  el: '#app',
  name: 'app',
  data(){
    return {
      data: {
        'title': '111',
        'children': [
          {
            'title': '111 - 1'
          }, {
            'title': '111 - 2',
            'children': [
              {'title': '111 - 2 - 1'}
            ]
          }
        ]
      }
    }
  },
  methods: {
    nCllick(title){
        console.log('parent: ' + title)
    }
  }
})

<script src="https://unpkg.com/vue/dist/vue.js"></script>
<div id="app">
  <m-tree :data="data" @nodeClick="nCllick"></m-tree>
</div>