Introduction to the implementation method of recursive components in Vue (with examples: three-level menu)-Vue.js-php.cn

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Introduction to the implementation method of recursive components in Vue (with examples: three-level menu)

青灯夜游

Nov 04, 2020 pm 05:35 PM

vuerecursive components

The following Vue.js tutorial column uses examples to create a three-level menu to introduce the implementation method of recursive components in Vue. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Introduction to the implementation method of recursive components in Vue (with examples: three-level menu)

#There is a recursive algorithm in js. At the same time, we can also use props to implement recursive calls to vue templates, but the premise is that the component has the name attribute

Parent component: slotDemo.vue:

<template>
  <p>
    <!-----递归组件----->
    <ul>
      <simple3 :tree="item" v-for="item in tree"></simple3>
    </ul>

  </p>
</template>
<style lang="stylus" rel="stylesheet/stylus">
  li
   padding-left 30px
</style>
<script>
  import simple3 from "./simple/simple3.vue";
  export default{
    data(){
      return {
        tree: [{
          label: "一级菜单",
          test:1,
          children: [{
            label: "二级菜单",
            test:2,
            children: [{
              label: "三级菜单",
              test:3
            }]
          }]
        }]
      }
    },

    components: {
     
      simple3
    }
  }
</script>

Child component: simple3.vue

<template>
  <li>
    <a>{{tree.label}}</a>
    <simple3 v-if="tree.children" :tree="item" v-for="item in tree.children" :class="item.test==2?&#39;test2&#39;:&#39;test3&#39;"></simple3>

  </li>
</template>
<style rel="stylesheet/stylus" lang="stylus">
    .test2
      list-style disc

    .test3
      list-style decimal
</style>
<script>
  export default{
    name: "simple3",
    props: ["tree"]
  }
</script>

The above is a child component with the name defined as simple03. Then call itself in the template, combined with v-for to implement recursion

In order to prevent an infinite loop, v-if is added as a judgment condition when calling itself

When calling in the parent component, you need to pass in a tree through props;

In order to distinguish each level of menu, I added a test field to each sub-collection in the tree to distinguish Which level of menu then processes its different styles

The final effect:

##Related recommendations:

2020 Summary of front-end vue interview questions (with answers)

vue tutorial recommendation: 2020 latest 5 vue.js video tutorial selections

For more programming-related knowledge, please visit:

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