JSFiddle - React, Tailwind, and code Playground

by cmaai

HTML

<script src="https://unpkg.com/vue@latest/dist/vue.js"></script>
<!-- item template -->
<script type="text/x-template" id="item-template">
    <li>
    <div
      :class="{bold: isFolder}"
      @click="toggle"
      @dblclick="changeType">
      <span v-if="isFolder">[{{ open ? '-' : '+' }}]</span>
       {{ model.name }}
    </div>
    <ul v-show="open" v-if="isFolder">
      <item
        class="item"
        v-for="(model, index) in model.children"
        :key="index"
        :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" class = "domtree">
  <item
    class="item"
    :model="treeData">
  </item>
</ul>

CSS

body {
  font-family: Menlo, Consolas, monospace;
  color: #444;
}
.item {
  cursor: pointer;
}
.bold {
  font-weight: bold;
}

ul.domtree, ul.domtree ul {
    margin: 0;
    padding: 0 0 0 2em;
}

ul.domtree li {
    list-style: none;
    position: relative;
}

ul.domtree li:before {
    position: absolute;
    content: '';
    top: -0.1em;
    left: -0.5em;
    width: 0.4em;
    height: 0.615em;
    border-style: none none solid dashed;
    border-width: 0.05em;
}

ul.domtree li:not(:last-child):after {
    position: absolute;
    content: '';
    top: 0;
    left: -0.5em;
    bottom: 0;
    border-style: none none none dashed;
    border-width: 0.05em;
}

JavaScript

// 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' }
          ]
        }
      ]
    }
  ]
}

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

// boot up the demo
var demo = new Vue({
  el: '#demo',
  data: {
    treeData: data
  }
})