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vue+elementUI組件遞歸實(shí)現(xiàn)可折疊動態(tài)渲染多級側(cè)邊欄導(dǎo)航

更新時(shí)間：2021年04月22日 15:02:15 作者：是日前端

這篇文章主要介紹了vue+elementUI組件遞歸實(shí)現(xiàn)可折疊動態(tài)渲染多級側(cè)邊欄導(dǎo)航，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

早就實(shí)現(xiàn)了功能，但是發(fā)現(xiàn)點(diǎn)擊的時(shí)候，選中的菜單項(xiàng)背景色會變白，周五時(shí)候仔細(xì)觀察了一下，發(fā)現(xiàn)并不是調(diào)整樣式的問題，而是選項(xiàng)沒有被選中，于是好好研究了一下組件遞歸這塊，總結(jié)記錄一下心路歷程

一、概念

遞歸：遞歸其實(shí)說白了，就是自己調(diào)用自己，樣子就像是套娃一個(gè)套一個(gè)的，小時(shí)候玩過一個(gè)游戲漢諾塔就是利用的遞歸原理：

在這里插入圖片描述

函數(shù)遞歸：函數(shù)利用函數(shù)名還調(diào)用自己
組件遞歸：所以組件遞歸利用的是vue組件中的name屬性來實(shí)現(xiàn)的

二、需求

實(shí)現(xiàn)可折疊動態(tài)渲染多級側(cè)邊欄導(dǎo)航

三、分析

在這里插入圖片描述

1、觀察到側(cè)邊欄導(dǎo)航是一級一級的，第二級就相當(dāng)于再重復(fù)一遍第一級 2、有一個(gè)特點(diǎn)，有的菜單有下級，有的沒有下一級 3、動態(tài)渲染，說明是從后臺接口獲取的樹類型數(shù)據(jù)，動態(tài)的渲染上去四、代碼實(shí)現(xiàn) 1、首先先執(zhí)行一下文檔里的demo試一下：

文檔：element文檔

2、改成自己需要的樣式，第一次是這么寫的

父組件SideBar

<template>
  <el-menu class="menu-wrap" :default-active="menuActiveName || 'home'" :active="menuActiveName || 'home'"
           :collapse="sidebarFold" :collapseTransition="false" :unique-opened="true" @select="selectItem">
    <template>
      <el-menu-item @click="sidebarFold = !sidebarFold">
        <i v-show="!sidebarFold" class="el-icon-s-fold"></i>
        <i v-show="sidebarFold" class="el-icon-s-unfold"></i>
        <span slot="title" class="sidebar-one">導(dǎo)航列表</span>
      </el-menu-item>
    </template>
<!--    <side-bar-item :list="menuList"></side-bar-item>-->
    <template v-for="(item,index) in menuList" class="menu">
      <!-- 標(biāo)題 -->
      <template v-if="item.children.length" >
        <el-submenu :key="index" :index="item.id" class="sub-menu-item">
          <template :index="item.index" slot="title">
            <!--            <i :class="item.icon"></i>-->
            <i class="iconfont icon-danganjianying"></i>
            <span>{{item.name}}</span>
          </template>
          <el-menu-item-group class="menu-item-group">
            <side-bar-item :list="item.children"></side-bar-item>
          </el-menu-item-group>
        </el-submenu>
      </template>
      <!-- 選項(xiàng) -->
      <template v-else>
        <el-menu-item :key="index" :index="item.id" class="menu-item">
          <!--          <i :class="item.icon"></i>-->
          <i class="iconfont icon-danganjianying"></i>
          <span>{{item.name}}</span>
        </el-menu-item>
      </template>
    </template>
  </el-menu>
</template>

<script>

export default {
  name: 'SideBar',
  components: {
    SideBarItem: () => import('@/components/common/SideBarItem')
  },
  data () {
    return {

    }
  },
  mounted () {
  },
  methods: {
    selectItem(name, path){
      // alert(name)
      this.$router.push(path)
      this.$store.commit('common/updateMenuActiveName', name)
    }
  },
  computed: {
    menuList: {
      get () {
        return this.$store.state.common.menuList
      },
      set (val) {
        this.$store.commit('common/updateMenuList', val)
      }
    },
    menuActiveName: {
      get () { return this.$store.state.common.menuActiveName },
      set (val) { this.$store.commit('common/updateMenuActiveName', val) }
    },
    sidebarFold: {
      get() {return this.$store.state.common.sidebarFold;},
      set(val) {this.$store.commit("common/updateSidebarFold", val);}
    },
  },
}
</script>
<style lang="less" scoped>
.menu-wrap{
  width: 200px;
  min-height: 1020px;
  background: url('../../assets/img/sidebar_bg.png') no-repeat;
  background-size: 100% 100%;
}

/deep/ .el-menu{
  background-color: transparent !important;
  .iconfont {
    font-size: 18px;
    vertical-align: sub;
    margin-right: 5px;
    display: inline-block;
    width: 20px;
    text-align: center;
  }
}

/deep/ .el-menu-item,
/deep/ .el-submenu__title{
  color: #fff;

  .iconfont{
    color: #fff;
  }
}

/deep/ .el-menu-item span,
/deep/ .el-submenu__title span{
  padding-left: 10px;
}

/deep/ .el-menu-item.is-active {
  -webkit-box-shadow: inset 5px 100px 0px -2px #0064B6;
  box-shadow: inset 5px 100px 0px -2px #0064B6;
}

/deep/ .el-submenu__title:hover,
/deep/ .el-menu-item:hover{
  background: #0064B6;
}

/deep/ .el-menu-item-group__title{
  padding: 0;
}

</style>

子組件SideBarItem

<template>
  <div class="menu">
    <template v-for="(item,index) in list">
      <!-- 標(biāo)題 -->
      <template v-if="item.children.length" >
        <el-submenu :key="index" :index="item.id" class="sub-menu-item">
          <template :index="item.index" slot="title">
<!--            <i :class="item.icon"></i>-->
            <i class="iconfont icon-danganjianying"></i>
            <span>{{item.name}}</span>
          </template>
          <el-menu-item-group class="menu-item-group">
            <side-bar-item :list="item.children"></side-bar-item>
          </el-menu-item-group>
        </el-submenu>
      </template>
      <!-- 選項(xiàng) -->
      <template v-else>
        <el-menu-item :key="index" :index="item.id" class="menu-item" @click="selectItem(item.name, item.path)">
<!--          <i :class="item.icon"></i>-->
          <i class="iconfont icon-danganjianying"></i>
          <span>{{item.name}}</span>
        </el-menu-item>
      </template>
    </template>
  </div>
</template>
<script>

export default {
  name: 'SideBarItem',
  // props: ['list'],
  props: {
    list: {
      type: Array || ''
    }
  },
  data () {
    return {
      treeData: [{
        label: '某某省',
        children: [{
          label: '中共某某省委員會'
          // children: [{
          // label: '三級 1-1-1'
          // }]
        }, {
          label: '中共某某省辦公室'
        }, {
          label: '中共某某省組織部'
        }
        ]
      }
      ],
      isShow: false
      // menuList: []
    }
  },
  mounted () {
    this.loadSysMenu()
  },
  methods: {
    loadSysMenu () {
      // console.log('menu', this.menuList)
    },
    // personManage (name) {
    //   if (name === '人員管理') {
    //     this.isShow = !this.$store.state.common.rbflag
    //     // alert('111' + this.isShow)
    //     this.$store.commit('common/updateShowRbox', this.isShow)
    //   }
    // },
    selectItem(name, path){
      // alert(name)
      this.$router.push(path)
      this.$store.commit('common/updateMenuActiveName', name)
    }
  },
}
</script>
<style lang="less" scoped>
.menu{
  width: 100%;

  .sub-menu-item /deep/ .el-submenu__title,
  .menu-item{
    height: 60px;
    line-height: 60px;
    text-align: left;
    //padding-left: 30px !important;
    //border-bottom: 1px solid #000;
    //border-right: 1px solid #000;
    color: #fff;
  }

  .sub-menu-item .el-menu-item{
    padding-right: 0;
  }

 /deep/ .el-menu-item .is-active{
    background-color: #0087df;
  }

  .menu-item:hover,
  /deep/ .el-submenu__title:hover{
    background-color: #0087df;
  }

  .menu-item span,
  .sub-menu-item /deep/ .el-submenu__title>span{
    font-weight: 700;
  }

  .menu-item-group /deep/ .el-menu-item-group__title{
    padding: 0 !important;
  }

  .menu-item-group .menu-item{
    background: url('../../assets/img/sidebar_bg.png') no-repeat;
  }

  .el-menu-item-group span{
    font-weight: normal;
  }

}

</style>

后來發(fā)現(xiàn)折疊不成功，而且選中之后選中項(xiàng)樣式?jīng)]變，后來發(fā)現(xiàn)是沒選中，研究發(fā)現(xiàn)是因?yàn)槎嗲短琢艘粚觗iv，而且用了el-menu-item-group項(xiàng)目中并不需要這個(gè)，于是改進(jìn)如下：

父組件SideBar

<template>
  <el-menu class="menu-wrap" :default-active="menuActiveName" :collapse="sidebarFold" :collapseTransition="false" :unique-opened="true">
    <template>
      <el-menu-item @click="foldSideBar">
        <i v-show="!sidebarFold" class="el-icon-s-fold"></i>
        <i v-show="sidebarFold" class="el-icon-s-unfold"></i>
        <span slot="title" class="sidebar-one">導(dǎo)航列表</span>
      </el-menu-item>
    </template>
    <side-bar-item v-for="menu in menuList" :key="menu.id" :menu="menu"></side-bar-item>
  </el-menu>
</template>

<script>

export default {
  name: 'SideBar',
  components: {
    SideBarItem: () => import('@/components/common/SideBarItem')
  },
  data () {
    return {
    }
  },
  mounted () {
  },
  methods: {
    foldSideBar(){
      this.sidebarFold = !this.sidebarFold
      this.menuActiveName = 'NAV'
    }
  },
  computed: {
    menuList: {
      get () {
        return this.$store.state.common.menuList
      },
      set (val) {
        this.$store.commit('common/updateMenuList', val)
      }
    },
    menuActiveName: {
      get () {
        console.log(this.$store.state.common.menuActiveName)
        return this.$store.state.common.menuActiveName
      },
      set (val) {
        this.$store.commit('common/updateMenuActiveName', val)
      }
    },
    sidebarFold: {
      get() {return this.$store.state.common.sidebarFold;},
      set(val) {this.$store.commit("common/updateSidebarFold", val);}
    },
  },
}
</script>
<style lang="less" scoped>
.menu-wrap{
  width: 200px;
  min-height: 1020px;
  background: url('../../assets/img/sidebar_bg.png') no-repeat;
  background-size: 100% 100%;
}

/deep/ .el-menu{
  background-color: transparent !important;
  .iconfont {
    font-size: 18px;
    vertical-align: sub;
    margin-right: 5px;
    display: inline-block;
    width: 20px;
    text-align: center;
  }
}

/deep/ .el-menu-item,
/deep/ .el-submenu__title{
  color: #fff;

  .iconfont{
    color: #fff;
  }
}

/deep/ .el-menu-item span,
/deep/ .el-submenu__title span{
  padding-left: 10px;
}

/deep/ .el-menu-item.is-active {
  -webkit-box-shadow: inset 5px 100px 0px -2px #0064B6;
  box-shadow: inset 5px 100px 0px -2px #0064B6;
}

/deep/ .el-submenu__title:hover,
/deep/ .el-menu-item:hover{
  background: #0064B6;
}

</style>

子組件SideBarItem

<template>
    <!--    該菜單下還有子菜單-->
    <el-submenu v-if="menu.children.length" :index="menu.code" :popper-append-to-body=false>
        <template slot="title">
            <i class="iconfont icon-danganjianying"></i>
            <span>{{ menu.name }}</span>
        </template>
        <side-bar-item v-for="item in menu.children" :key="item.id" :menu="item"></side-bar-item>
    </el-submenu>
    <!--    該菜單下無子菜單-->
    <el-menu-item v-else :index="menu.code" @click="selectItem(menu.code, menu.path)">
        <i class="iconfont icon-danganjianying"></i>
        <span>{{ menu.name }}</span>
    </el-menu-item>
</template>
<script>

export default {
  name: 'SideBarItem',
  // props: ['menu'],
  props: {
      menu: {
      type: Object || {}
    }
  },
  data () {
    return {

    }
  },
  mounted () {
  },
  methods: {
    selectItem(code, path){
      // alert(name)
      console.log(code, path)
      this.$router.push(path)
      this.$store.commit('common/updateMenuActiveName', code)
    }
  },
}
</script>
<style lang="less" scoped>
.menu{
  width: 100%;

  .menu-item{
    height: 60px;
    line-height: 60px;
    text-align: left;
    color: #fff;
  }

  .sub-menu-item .el-menu-item{
    padding-right: 0;
  }

 /deep/ .el-menu-item .is-active{
    background-color: #0087df;
  }

  .menu-item:hover{
    background-color: #0087df;
  }

  .menu-item span{
    font-weight: 700;
  }

}

</style>

功能基本實(shí)現(xiàn)，但是出現(xiàn)一個(gè)bug，當(dāng)鼠標(biāo)點(diǎn)折疊時(shí)，會出現(xiàn)循環(huán)調(diào)用某個(gè)事件，導(dǎo)致棧溢出報(bào)錯(cuò)，查看文章只需對子菜單設(shè)置屬性 :popper-append-to-body=“false” 即可
參考文章：Element-ui NavMenu子菜單使用遞歸生成時(shí)使用報(bào)錯(cuò)

最后附上簡單的測試數(shù)據(jù)：

testData: [
            {"id":"34161C2E8-7348-4439-8899-9A8039AE6AE4","pid":"0","code":"HOME","name":"首頁","path":"/home","type":null,"icon":null,"sysId":"2761C2E8-7348-4439-8899-9A8039AE6AE3","orderNo":0,"isCheck":null,"children":[]},
            {"id":"703DBEBD-F92C-4347-9203-F60A73153C3F","pid":"0","code":"WD","name":"溫度","path":"/temperature","type":null,"icon":null,"sysId":"2AB00274-73DF-459A-A02E-C79A4D8A8929","orderNo":0,"isCheck":null,"children":[]},
            {"id":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","pid":"0","code":"BJ","name":"報(bào)警","path":"/alarm","type":null,"icon":null,"sysId":"2AB00274-73DF-459A-A02E-C79A4D8A8929","orderNo":0,"isCheck":null,
              "children":[
                {"id":"1C99333D-886F-4AD6-93C4-7C5244E48247","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"FD","name":"防盜","path":"/burg","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
                {"id":"1DBDF678-F51F-444A-B995-61E5D9CCA5AF","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"JL","name":"警鈴","path":"/bell","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
                {"id":"BFC8C2E1-0E5B-4EEE-B91D-3DABC63FF481","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"JS","name":"浸水","path":"/immersion","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
                {"id":"BFC8C2E1-0E5B-4EEE-B91D-3DABC63FF482","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"MJ","name":"門禁","path":"/punch","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
                {"id":"BFC8C2E1-0E5B-4EEE-B91D-3DABC63FF483","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"ZT","name":"狀態(tài)","path":"/state","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]}
              ]
            },
            {"id":"34161C2E8-7348-4439-8899-9A8039AE6AE5","pid":"0","code":"GZ","name":"工作","path":"/work","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,
              "children":[]
            },
            {"id":"0CD6B09A-AA43-4AE9-9AC7-29BC5AC83495","pid":"0","code":"SJ","name":"數(shù)據(jù)","path":"/data","type":null,"icon":null,"sysId":"2AB00274-73DF-459A-A02E-C79A4D8A8929","orderNo":0,"isCheck":null,
              "children":[]
            },
            {"id":"049C670D-A33E-4188-9206-B3F3B5DDE77B","pid":"0","code":"SP","name":"視頻","path":"/video","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
            {"id":"0A15DBB6-3241-4C7F-AAD4-5417E7BBECAA","pid":"0","code":"RZ","name":"日志","path":"/log","type":null,"icon":null,"sysId":"2AB00274-73DF-459A-A02E-C79A4D8A8929","orderNo":0,"isCheck":null,
              "children":[]
            }
          ]

效果如圖：

在這里插入圖片描述

折疊后如圖：

在這里插入圖片描述

到此這篇關(guān)于vue+elementUI組件遞歸實(shí)現(xiàn)可折疊動態(tài)渲染多級側(cè)邊欄導(dǎo)航的文章就介紹到這了,更多相關(guān)elementUI可折疊動態(tài)側(cè)邊欄導(dǎo)航內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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