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vue用递归组件写树形控件的实例代码

前端林三哥 人气:0

最近在vue项目中遇到需要用树形控件的部分,比如导航目录是不确定的,所以必须要用树形结构,不管导航目录有几级,都可以自动显示出来,我一开始觉得element-ui有树形控件,不需要自己写,调用就可以了,后来才发现,调用完事之后,样式不可控,而且要加东西特别困难,无法满足项目需求,于是,一首《凉凉》送给自己,后来去翻vue官网,发现居然有递归组件,一开始我写了两个组件,互相调用,可以写出来,后来返现,如果项目要用到5棵树,我要写10个组件,而且样式控制起来超级恶心,于是我就各种查资料,原生的也试过了,原生js写的并不能在vue项目中使用,因为它用js创造的元素,违反了vue数据驱动视图的原则,所以pass,又听一遍《凉凉》,当然如果有小伙伴对原生js写的树形结构感兴趣我也可以贴出来,那么我们先来看看vue版的吧,后来,我就一直在默念“递归”这个词,递归不就是自己调自己吗,我可以只写一个组件,来调用自己啊,也许应该可以,后来,经过试验终于成功了,下面我贴上代码

vue版的树形控件

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>树形结构2</title>
</head>
<body>
  <div id = "app">
    <tree :folder = "trees" :select = "select"></tree>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vuehttps://img.qb5200.com/download-x/dist/vue.js"></script>
  <script>
    Vue.component('tree', {
      name:"tree",
      template:`<ul>
            <li v-for = "item in folder">
              <span @click = "select(item)">{{ item.label }}</span>
              <tree v-if = "item.children" :folder = "item.children" :select = "select"></tree>
            </li>
          </ul>`,
      props:["folder","select"],
    })
    // <tree v-if = "item.children" :folder = "item.children"></tree>
    var app = new Vue({
      el:"#app",
      data:{
        msg:"hello world",
        trees: [
          {
            id:1,
            label:"1级目录1",
            show:false,
            children:[
              {
                id:"1-1",
                label:"1.1目录"
              },
              {
                id:"1-2",
                label:"1.2目录"
              },
              {
                id:"1-3",
                label:"1.3目录"
              },
            ]
          },
          {
            id:2,
            label:"1级目录2",
            show:false
          },
          {
            id:3,
            label:"1级目录3",
            show:false,
            children:[
              {
                id:"3-1",
                label:"3.1目录"
              },
              {
                id:"3-2",
                label:"3.2目录",
                show:false,
                children:[
                  {
                    id:"3-2-1",
                    label:"3.2.1目录"
                  },
                  {
                    id:"3-2-2",
                    label:"3.2.2目录"
                  },
                  {
                    id:"3-2-3",
                    label:"3.2.3目录"
                  }
                ]
              }
            ]
          },
          {
            id:4,
            label:"1级目录4",
            show:false,
            children:[
              {
                id:"4-1",
                label:"4.1目录"
              },
              {
                id:"4-2",
                label:"4.2目录",
                show:false,
                children:[
                  {
                    id:"4-2-1",
                    label:"4.2.1目录"
                  }
                ]
              }
            ]
          },
          {
            id:5,
            label:"1级目录5",
            show:false,
            children:[
              {
                id:"5-1",
                label:"5.1目录",
                show:false,
                children:[
                  {
                    id:"5-1-1",
                    label:"5.1.1目录"
                  },
                  {
                    id:"5-1-2",
                    label:"5.1.2目录",
                    show:false,
                    children:[
                      {
                        id:"5-1-2-1",
                        label:"5.1.2.1目录"
                      },
                    ]
                  }
                ]
              },
              {
                id:"5-2",
                label:"5.2目录",
                show:false
              }
            ]
          },
        ]
      },
      methods:{
        clickHandler(){
          console.log(23333);
        },
        select(data){
          console.log(data);
        }
      },
      mounted(){
        console.log(this.trees);
      }
    })
  </script>
</body>
</html>

看下结果

这里写图片描述

当然我用的全局组件,如果用vue-cli搭建的环境是一样的,引入组件就可以了,但是一定要注意,组件内必须要用name属性,而且name的名称要和组件名称(组件标签名称)一致才可以

贴一个项目中用的模板吧,相当于做笔记了

<template>
  <ul class = "dataBaseTree">
    <li v-for = "(item,index) in folder" :key = "index">
      <span @click = "select(item)" :class = "{'active':currentId == item.id}">
        <i class = "folderIcon" v-if = "item.children">
          <icon :icon = "'xiala'" v-if = "item.show"></icon>
          <icon :icon = "'xiala2'" v-else></icon>
        </i>
        {{ item.label }}
      </span>
      <el-collapse-transition>
        <DatabaseTree v-if = "item.children && item.show" :folder = "item.children" :select = "select" :currentId = "currentId"></DatabaseTree>
      </el-collapse-transition>
    </li>
  </ul>
</template>

<script>
  import { mapGetters , mapActions} from 'vuex';
  export default{
    name:"DatabaseTree",
    props:["folder","select","currentId"],
    data(){
      return{
        addParams:{
          label:"",
          children:[]
        },
        noteData:{
          children:[]
        }
      }
    },
     computed:{
      ...mapGetters(["catalog"])
    },
    methods:{}
  }
</script>

<style lang="scss" scoped>
  .dataBaseTree{
    padding-left:12%;
    line-height:40px;
    ul{
      padding-left:12%;
      line-height:40px;
      li{
        span{
          display:inline-block;
          padding-left:23%;
          height:100%;
          width:120%;
          color:#ababab;
          font-size:14px;
          position: relative;
          cursor: pointer;
          &:hover{
            background: #EDF0F5;
          }
          .folderIcon{
            color:#BCBCBC;
            position: absolute;
            top:-1px;
            left:22px;
          }
        }
      }
    }
    li{
      position: relative;
      span{
        display:inline-block;
        padding-left:40px;
        font-size:14px;
        height:100%;
        width:120%;
        cursor: pointer;
        position: relative;
        right:25px;
        top:-2px;
        color:#ababab;
        &:hover{
          background: #EDF0F5;
        }
        .titleIcon{
          color:#C3C3C3;
          font-size:16px;
          position: absolute;
          top:12px;
          left:16px;
        }
        .folderIcon{
          color:#BCBCBC;
          position: absolute;
          top:-1px;
          left:22px;
        }
      }
      .active{
        background: #EDF0F5;
      }
    }
  }
</style>

vue版的就到这里了

 下面贴一个原生js版的,感兴趣的小伙伴可以继续往下看

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <script>
    var tree=[
        {
          id:1,
          label:"1级目录1",
          children:[
            {
              id:"1-1",
              label:"1.1目录"
            },
            {
              id:"1-2",
              label:"1.2目录"
            },
            {
              id:"1-3",
              label:"1.3目录"
            },
          ]
        },
        {
          id:2,
          label:"1级目录2",
        },
        {
          id:3,
          label:"1级目录3",
          children:[
            {
              id:"3-1",
              label:"3.1目录"
            },
            {
              id:"3-2",
              label:"3.2目录",
              children:[
                {
                  id:"3-2-1",
                  label:"3.2.1目录"
                },
                {
                  id:"3-2-2",
                  label:"3.2.2目录"
                },
                {
                  id:"3-2-3",
                  label:"3.2.3目录"
                }
              ]
            }
          ]
        },
        {
          id:4,
          label:"1级目录4",
          children:[
            {
              id:"4-1",
              label:"4.1目录"
            },
            {
              id:"4-2",
              label:"4.2目录",
              children:[
                {
                  id:"4-2-1",
                  label:"4.2.1目录"
                }
              ]
            }
          ]
        },
        {
          id:5,
          label:"1级目录5",
          children:[
            {
              id:"5-1",
              label:"5.1目录",
              children:[
                {
                  id:"5-1-1",
                  label:"5.1.1目录"
                },
                {
                  id:"5-1-2",
                  label:"5.1.2目录",

                  children:[
                    {
                      id:"5-1-2-1",
                      label:"5.1.2.1目录"
                    },
                  ]
                }
              ]
            },
            {
              id:"5-2",
              label:"5.2目录"
            }
          ]
        },
      ];
    var render = function(tree) {
      if (!tree) return null
      var ul = document.createElement('ul');
      for(var i = 0; i < tree.length;i++){
        var li = document.createElement('li')
        // 创建span标签
        var span = document.createElement('span'); span.innerText = tree[i].label;
        li.appendChild(span);
        if(tree[i].children){
          var sub = render(tree[i].children);
          li.appendChild(sub);
        }
        ul.appendChild(li);
      }
      return ul
    };
    document.body.innerHTML = '';
    document.body.appendChild(render(tree)); 
  </script>
</body>
</html>

看下结果

这里写图片描述

总结

以上所述是小编给大家介绍的vue用递归组件写树形控件的实例代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!

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