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vue.js+element-ui implements tree structure

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Release： 2018-04-27 14:31:08

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This time I will bring you vue.js element-ui to implement tree structure, vue.js element-ui to implement tree structure. What are the precautions?. Here are practical cases. Let’s take a look. one time.

Due to business needs, it is required to implement a tree menu, and the menu data is returned from the background. I found several articles on the Internet, and finally found a solution.

Scenario: According to business requirements, it is necessary to implement an active tree menu. The menu data is returned from the background. The final rendering is as follows:

Returned from the background The data format is like this:

data=[{
 pID:'1',//父ID
 name:'目录一',
menuID:'m1',//本身ID
　　　　　　　　　　　　　　isContent:false//判断是否是目录
},
 {
pID:'1',
 name:'目录二',
menuID:'m2',
　　　　　　　　　　　　　　isContent:false
 },
 {
 pID:'m1',
 name:'目录一--菜单一',
menuID:'m11',
　　　　　　　　　　　　　　isContent:true
 },
 {
 pID:'m1',
 name:'目录一--目录一',
menuID:'m12',
　　　　　　　　　　　　　　isContent:false
 },
　　　　　　　　　　　{
　　　　　　　　　　　　pID:'m12',
 name:'目录一--目录一--菜单一',
menuID:'m121',
　　　　　　　　　　　　 isContent:true
 },
 {
 pID:'m2',
 name:'目录二--菜单一',
menuID:'m21',
　　　　　　　　　　　　　　isContent:true
 },
 {
 pID:'m2',
 name:'目录二--菜单二',
menuID:'m22',
　　　　　　　　　　　　　　isContent:true
 },
 ]

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This is a string of data with a parent-child relationship. The first step is to convert this large string of data into a tree structure:

tree(){
        let data=[{
              pID:'1',//父ID
              name:'目录一',
              menuID:'m1',//本身ID
  　　　　　　　　　　　　　　isContent:false//判断是否是目录
            },
            {
              pID:'1',
              name:'目录二',
              menuID:'m2',
  　　　　　　　　　　　　　　isContent:false
            },
            {
              pID:'m1',
              name:'目录一--菜单一',
              menuID:'m11',
  　　　　　　　　　　　　　　isContent:true
            },
            {
              pID:'m1',
              name:'目录一--目录一',
              menuID:'m12',
  　　　　　　　　　　　　　　isContent:false
            },
  　　　　　　　　　　　{
    　　　　　　　　　　　　pID:'m12',
              name:'目录一--目录一--菜单一',
              menuID:'m121',
  　　　　　　　　　　　　 isContent:true
            },
            {
              pID:'m2',
              name:'目录二--菜单一',
              menuID:'m21',
  　　　　　　　　　　　　　　isContent:true
            },
            {
              pID:'m2',
              name:'目录二--菜单二',
              menuID:'m22',
  　　　　　　　　　　　　　　isContent:true
            },
          ]
        let tree = []
        for(let i=0;i<data.length;i++){
          if(data[i].pID == &#39;1&#39;){
            let obj = data[i]
            obj.list = []
            tree.push(obj)
            data.splice(i,1)
            i--
          }
        }
        menuList(tree)
        console.log(tree)
        function menuList(arr){
          if(data.length !=0){
            for(let i=0; i<arr.length;i++){
              for(let j=0;j<data.length;j++){
                if(data[j].pID == arr[i].menuID){
                  let obj = data[j]
                  obj.list = []
                  arr[i].list.push(obj)
                  data.splice(j,1)
                  j--
                }
              }
              menuList(arr[i].list)
            }
          }
        }
      }

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Returned after running The structure is like this:

[{"pID":"1","name":"目录一","menuID":"m1","isContent":false,"list":[{"pID":"m1","name":"目录一--菜单一","menuID":"m11","isContent":true,"list":[]},{"pID":"m1","name":"目录一--目录一","menuID":"m12","isContent":false,"list":[{"pID":"m12","name":"目录一--目录一--菜单一","menuID":"m121","isContent":true,"list":[]}]}]},{"pID":"1","name":"目录二","menuID":"m2","isContent":false,"list":[{"pID":"m2","name":"目录二--菜单一","menuID":"m21","isContent":true,"list":[]},{"pID":"m2","name":"目录二--菜单二","menuID":"m22","isContent":true,"list":[]}]}]

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Next, we will show the Navigationmenu component of element-ui used in the project. In order to achieve such a tree structure, each level The menu acts as a component alone, recursively by judging the value of isContent. I directly posted the code

<el-menu 
      theme="dark"
      :default-active="openMenuID"
      :default-openeds="openMenuArr"
      class="el-menu"
     @select="handleSelect">
      <template v-for="(item,index) in menuList">
         <el-submenu :index=item.menuID v-if="item.IsContent">
           <template slot="title">
          <i class="el-icon-menu"></i>
             {{item.name}}
           </template>
           <tree-menu :data="item.list"></tree-menu>
         </el-submenu>
         <el-menu-item :index=item.menuID v-else>{{item.name}}</el-menu-item>
      </template>
    </el-menu>

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The code of the tree-menu component:

<template v-for="(menu,index) in data">
      <el-submenu :index=menu.menuID v-if="menu.IsContent">
        <template slot="title">
          <i class="el-icon-plus"></i>
          {{menu.name}}</template>
        <tree-menu :data="menu.list"></tree-menu>
      </el-submenu>
      <el-menu-item v-else :index=menu.menuID>
        {{menu.name}}
      </el-menu-item>
    </template>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!