vue element 生成无线级左侧菜单的实现代码

2019-11-19 11:00:05

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来源：转载

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首先来总结element ui 官方文档的左侧菜单结构,带有el-submenu为子级节点,el-menu-item表示没有下级。当然,菜单不能写死，因为菜单也许不止两级,所以我们需要递归来实现。根据当前节点是否有下级去判断,如果有下级,则继续调用子级,直到没有下级为止,下面我贴上左侧菜单所有的代码:

请求数据格式

[   {    name: "首页",    id: -1,    icon: "el-icon-picture-outline-round",    url: "/index",    children: []   },   {    name: "按钮",    id: 20,    icon: "el-icon-message-solid",    url: "/button",    children: []   },   {    name: "测试1",    id: 1,    icon: "el-icon-s-claim",    url: "",    children: [     {      id: 4,      parentid: 1,      name: "测试1-1",      icon: "el-icon-chat-dot-round",      url: "",      children: [       {        id: 8,        parentid: 1,        name: "测试1-1-1",        icon: "el-icon-cloudy",        url: "/test",        children: []       },       {        id: 9,        parentid: 1,        name: "测试1-1-2",        icon: "el-icon-files",        url: "/test1",        children: []       }      ]     },     {      id: 5,      parentid: 1,      name: "测试1-2",      icon: "el-icon-shopping-cart-1",      url: "/test3",      children: []     }    ]   },   {    name: "测试2",    id: 2,    icon: "el-icon-menu",    url: "",    children: [     {      id: 6,      parentid: 2,      name: "测试2-1",      icon: "el-icon-folder-checked",      url: "",      children: []     },     {      id: 7,      parentid: 2,      name: "测试2-2",      icon: "el-icon-folder-remove",      url: "",      children: []     }    ]   },   {    name: "测试3",    id: 3,    icon: "el-icon-monitor",    url: "",    children: []   }  ]

menu.vue

<template> <div class="menu">  <div class="logo-con">   <div class="title" v-show="!collapse">    <span class="title__sider-title is-active">{{logo}}</span>   </div>   <div class="title" v-show="collapse">    <span class="title__sider-title el-tag--mini">LG</span>   </div>  </div>  <el-menu   :background-color="backgroundColor"   :text-color="textColor"   :default-active="$route.meta.pageId"   :collapse="collapse"  >   <template v-for="item in list">    <router-link :to="item.url" :key="item.id" v-if="item.children.length===0">     <el-menu-item :index="item.id.toString()">      <i :class="item.icon"></i>      <span slot="title">{{item.name}}</span>     </el-menu-item>    </router-link>    <subMenu v-else :data="item" :key="item.id"></subMenu>   </template>  </el-menu> </div></template><script>import subMenu from "./subMenu";export default { name: "menuList", components: {  subMenu }, data() {  return {   collapse: false, //是否折叠   list: [], //当行菜单数据源   backgroundColor: "#304156", //导航菜单背景颜色   textColor: "#BFCBD9", //导航菜单文字颜色   logo: "LOGO" //logo  }; }};</script><style lang="scss" scoped>.el-menu { border-right: none; a {  text-decoration: none; }}.logo-con { height: 64px; padding: 10px; .title {  position: relative;  text-align: center;  font-size: 20px;  height: 64px;  line-height: 64px;  span {   padding: 0 5px 0 0;   color: #409eff;   font-size: 20px;  } }}</style>

submenu.vue

　　这里有个知识点functional,不懂自行百度,文档地址: https://cn.vuejs.org/v2/guide/render-function.html#search-query-sidebar

5 <!-- * @Description:  * @Author: PengYH * @Date: 2019-08-06 --><template functional> <el-submenu :index="props.data.id.toString()">  <template slot="title">   <i :class="props.data.icon"></i>   <span>{{props.data.name}}</span>  </template>  <template v-for="item in props.data.children">   <router-link :to="item.url" :key="item.id" v-if="item.children.length===0">    <el-menu-item class="subitem" :index="item.id.toString()">     <i :class="item.icon"></i>     <span slot="title">{{item.name}}</span>    </el-menu-item>   </router-link>   <sub-menu v-else :data="item" :key="item.id"></sub-menu>  </template> </el-submenu></template><script>export default { name: "submenu", props: {  data: [Array, Object] }};</script><style lang="scss" scoped>.el-submenu { .el-menu-item {  padding: 0; }}</style>

效果图