How to implement circular references between components in Vue.js

Component is one of the most powerful features of Vue.js. Components can extend HTML elements and encapsulate reusable code. The following article mainly introduces you to the relevant information about circular references between Vue.js components. The article introduces it in detail through sample code. Friends in need can refer to it.

What is a component:

As we all know, components are one of the most powerful features of Vue.js. Components can extend HTML elements and encapsulate reusable code. At a high level, a component is a custom element to which Vue.js's compiler adds special functionality. In some cases, components can also be in the form of native HTML elements, extended with the is attribute. Not much to say below, let’s take a look at the main text of this article.

Introduction

I have written many large and small Vue-based projects, but I have basically never used the knowledge of component circular references.

In order to check for deficiencies, follow the official documentation to create a DEMO: Circular References between Components

My running version is vue-cli@2.8.1. After enabling the project, add the following js files and vue files are placed in the corresponding directories and run.

main.js

import Vue from 'vue'
import App from './App'
new Vue({
 el: '#app',
 template: &#39;<App/>&#39;,
 components: { App }
})

main.js Import the App component and register the App component in components.

App.vue

<template>
 <p id="app">
 <li v-for="folder in folders">
 <tree-folder v-bind:folder="folder"></tree-folder>
 </li>
 </p>
</template>
<script>
 import TreeFolder from &#39;./components/tree-folder&#39;
 export default {
 data: function () {
 return {
 folders: [
  {
  name: &#39;folder1&#39;,
  children: [{
  name: &#39;folder1 - folder1&#39;,
  children: [{
  name: &#39;folder1 - folder1 - folder1&#39;
  }]
  }, {
  name: &#39;folder1 - folder2&#39;,
  children: [{
  name: &#39;folder1 - folder2 - folder1&#39;
  }, {
  name: &#39;folder1 - folder2 - folder2&#39;
  }]
  }]
  },
  {
  name: &#39;folder 2&#39;,
  children: [{
  name: &#39;folder2 - folder1&#39;,
  children: [{
  name: &#39;folder2 - folder1 - folder1&#39;
  }]
  }, {
  name: &#39;folder2 - folder2&#39;,
  children: [{
  name: &#39;folder2-content1&#39;
  }]
  }]
  },
  {
  name: &#39;folder 3&#39;,
  children: [{
  name: &#39;folder3 - folder1&#39;,
  children: [{
  name: &#39;folder3 - folder1 - folder1&#39;
  }]
  }, {
  name: &#39;folder3 - folder2&#39;,
  children: [{
  name: &#39;folder3-content1&#39;
  }]
  }]
  }
 ]
 }
 },
 components: {
 TreeFolder
 }
 }
</script>

The App component imports the TreeFolder component and registers the TreeFolder component in components.

components/tree-folder.vue

<template>
 <p>
 <span>{{ folder.name }}</span>
 <tree-folder-contents :children="folder.children"></tree-folder-contents>
 </p>
</template>
<script>
 // 官方文档：「在我们的例子中，将 tree-folder 组件做为切入起点。我们知道制造矛盾的是 tree-folder-contents 子组件，所以我们在 tree-folder 组件的生命周期钩子函数 beforeCreate 中去注册 tree-folder-contents 组件」
 export default {
 props: [&#39;folder&#39;],
 data: function () {
  return {}
 },
 beforeCreate: function () {
 // 官方文档给出的是require
 // this.$options.components.TreeFolderContents = require(&#39;./tree-folder-contents.vue&#39;)
 // 在基于vue-cli@2.8.1按照上面的写法还是会报错
 // Failed to mount component: template or render function not defined.
 // 所以我们应该改为基于es6的写法异步加载一个组件如下
  this.$options.components.TreeFolderContents = () => import(&#39;./tree-folder-contents.vue&#39;)
 }
 }
</script>

The TreeFolder component imports the TreeFolderContents component and registers the TreeFolderContents component in components.

components/tree-folder-contents.vue

<template>
 <ul>
 <li v-for="child in children">
  <tree-folder v-if="child.children" :folder="child"></tree-folder>
  <span v-else>{{ child.name }}</span>
 </li>
 </ul>
</template>
<script>
 import TreeFolder from &#39;./tree-folder&#39;
 export default {
 props: [&#39;children&#39;],
 components: {
  TreeFolder
 }
 }
</script>

The TreeFolderContents component imports the TreeFolder component and registers the TreeFolder component in components to generate A circular reference.

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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