VueJs Tree递归元素发出给父对象 [英] VueJs Tree recursive elements emits to parent

问题描述

如何在递归子组件vuejs中发出事件

How do you emit event inside recursive child components vuejs

从vue网站 https://vuejs.org/v2/examples/tree-view.html

您如何将点击的每个ID传递给父级?

How would you transmit on click to the parent each clicked elements id?

推荐答案

对于递归元素，您可以创建事件总线在父母中，将其作为道具传递给孩子，然后让每个道具将其传递给他们产生的任何孩子.

In the case of recursive elements, you can create an event bus in the parent, pass it to the children as a prop, and have each prop pass it to any children they generate.

每个孩子都会在总线上发出事件，而父事件会处理这些事件.我复制了您链接的树状视图练习，并添加了总线功能.

Each child emits events on the bus, and the parent handles them. I copied the tree-view exercise you linked and added the bus functionality.

// demo data
var data = {
  name: 'My Tree',
  children: [{
      name: 'hello'
    },
    {
      name: 'wat'
    },
    {
      name: 'child folder',
      children: [{
          name: 'child folder',
          children: [{
              name: 'hello'
            },
            {
              name: 'wat'
            }
          ]
        },
        {
          name: 'hello'
        },
        {
          name: 'wat'
        },
        {
          name: 'child folder',
          children: [{
              name: 'hello'
            },
            {
              name: 'wat'
            }
          ]
        }
      ]
    }
  ]
};

var itemId = 0;

// define the item component
Vue.component('item', {
  template: '#item-template',
  props: {
    model: Object,
    bus: Object
  },
  data: function() {
    return {
      open: false,
      id: ++itemId
    }
  },
  computed: {
    isFolder: function() {
      return this.model.children &&
        this.model.children.length
    }
  },
  methods: {
    toggle: function() {
      if (this.isFolder) {
        this.open = !this.open;
        this.bus.$emit('toggled', this.id);
      }
    },
    changeType: function() {
      if (!this.isFolder) {
        Vue.set(this.model, 'children', [])
        this.addChild()
        this.open = true
      }
    },
    addChild: function() {
      this.model.children.push({
        name: 'new stuff'
      })
    }
  }
})

// boot up the demo
var demo = new Vue({
  el: '#demo',
  data: {
    treeData: data,
    bus: new Vue()
  },
  created() {
    this.bus.$on('toggled', (who) => {
      console.log("Toggled", who);
    });
  }
})

body {
  font-family: Menlo, Consolas, monospace;
  color: #444;
}

.item {
  cursor: pointer;
}

.bold {
  font-weight: bold;
}

ul {
  padding-left: 1em;
  line-height: 1.5em;
  list-style-type: dot;
}

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.min.js"></script>
<!-- item template -->
<script type="text/x-template" id="item-template">
  <li>
    <div :class="{bold: isFolder}" @click="toggle" @dblclick="changeType">
      {{model.name}}
      <span v-if="isFolder">[{{open ? '-' : '+'}}]</span>
    </div>
    <ul v-show="open" v-if="isFolder">
      <item class="item" :bus="bus" v-for="model in model.children" :model="model">
      </item>
      <li class="add" @click="addChild">+</li>
    </ul>
  </li>
</script>

<p>(You can double click on an item to turn it into a folder.)</p>

<!-- the demo root element -->
<ul id="demo">
  <item class="item" :bus="bus" :model="treeData">
  </item>
</ul>

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