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引言

在前端开发中，动态树和动态表格是常见的功能需求。ElementUI是一套基于Vue.js的组件库，提供了丰富的UI组件和交互功能，方便开发者快速构建前端界面。本文将介绍如何使用ElementUI实现动态树和动态表格的综合应用，以满足实际项目中的需求。

1. ElementUI树

1.1 树的基本概念

树是一种非线性的数据结构，由节点和边组成。每个节点可以有多个子节点，但只能有一个父节点（除了根节点）。树的层次结构使得它非常适合表示具有层次关系的数据。

1.2 示例代码和效果展示

以下是使用ElementUI实现动态树的示例代码：

<template><el-menu  router :default-active="$route.path" default-active="2" class="el-menu-vertical-demo" background-color="#334157" text-color="#fff"active-text-color="#ffd04b" :collapse="collapsed"><!-- <el-menu default-active="2" :collapse="collapsed" collapse-transition router :default-active="$route.path" unique-opened class="el-menu-vertical-demo" background-color="#334157" text-color="#fff" active-text-color="#ffd04b"> --><div class="logobox"><img class="logoimg" src="../assets/img/logo.png" alt=""></div><el-submenu v-for="m in menus" :index="'i_'+m.id" :key="'k_'+m.id"><template slot="title"><i :class="m.icon"></i><span>{{m.text}}</span></template><el-menu-item v-for="n in m.modules" :index="n.url" :key="'k_'+n.id"><i :class="n.icon"></i><span>{{n.text}}</span></el-menu-item></el-submenu></el-menu>
</template>
<script>export default {data() {return {collapsed: false,menus:[]}},created() {this.$root.Bus.$on('a', v => {this.collapsed = v;});let url = this.axios.urls.SYSTEM_MENUSthis.axios.get(url,{}).then(r => {this.menus = r.data.rows;}).catch(e => {})}}
</script>
<style>.el-menu-vertical-demo:not(.el-menu--collapse) {width: 240px;min-height: 400px;}.el-menu-vertical-demo:not(.el-menu--collapse) {border: none;text-align: left;}.el-menu-item-group__title {padding: 0px;}.el-menu-bg {background-color: #1f2d3d !important;}.el-menu {border: none;}.logobox {height: 40px;line-height: 40px;color: #9d9d9d;font-size: 20px;text-align: center;padding: 20px 0px;}.logoimg {height: 40px;}
</style>

• 路径配置

/*** 对后台请求的地址的封装，URL格式如下：* 模块名_实体名_操作*/
export default {'SERVER': 'http://localhost:8080', //服务器'SYSTEM_USER_DOLOGIN': '/user/userLogin', //登陆'SYSTEM_USER_DOREG': '/user/userRegister ', //注册'SYSTEM_MENUS': '/module/queryRootNode ', //左侧菜单树'Book_List': '/book/queryBookPager', //书籍列表'getFullPath': k => { //获得请求的完整地址，用于mockjs测试时使用return this.SERVER + this[k];}
}

• 路由配置

import Vue from 'vue'
import Router from 'vue-router'
import HelloWorld from '@/components/HelloWorld'
import Login from '@/views/Login'
import Register from '@/views/Register'
import AppMain from '@/components/AppMain'
import LeftNav from '@/components/LeftNav'
import TopNav from '@/components/TopNav'
import AddBook from '@/views/book/AddBook'
import BookList from '@/views/book/BookList'Vue.use(Router)export default new Router({routes: [{path: '/',name: 'Login',component: Login},{path: '/Register',name: 'Register',component: Register},{path: '/AppMain',name: 'AppMain',component: AppMain,children:[{path: 'LeftNav',name: 'LeftNav',component: LeftNav},{path: 'TopNav',name: 'TopNav',component: TopNav},{path: '/book/AddBook',name: 'AddBook',component: AddBook},{path: '/book/BookList',name: 'BookList',component: BookList}]}]
})

AppMain

<template><el-container class="main-container"><el-aside v-bind:class="asideClass"><LeftNav></LeftNav></el-aside><el-container><el-header class="main-header"><TopNav></TopNav></el-header><el-main class="main-center"><router-view></router-view></el-main></el-container></el-container>
</template><script>// 导入组件import TopNav from '@/components/TopNav.vue'import LeftNav from '@/components/LeftNav.vue'// 导出模块export default {components:{TopNav,LeftNav},data(){return{asideClass:'main-aside'}},created(){this.$root.Bus.$on('a',v=>{this.asideClass = v?'main-aside-collapsed':'main-aside'})}};
</script>
<style scoped>.main-container {height: 100%;width: 100%;box-sizing: border-box;}.main-aside-collapsed {/* 在CSS中，通过对某一样式声明! important ，可以更改默认的CSS样式优先级规则，使该条样式属性声明具有最高优先级 */width: 64px !important;height: 100%;background-color: #334157;margin: 0px;}.main-aside {width: 240px !important;height: 100%;background-color: #334157;margin: 0px;}.main-header,.main-center {padding: 0px;border-left: 2px solid #333;}
</style>

• 后台方法映射

 @Autowiredprivate IModuleService moduleService;@RequestMapping("/queryRootNode")@ResponseBodypublic JsonResponseBody<List<Module>> queryRootNode(){try {List<Module> modules = moduleService.queryRootNode(-1);return new JsonResponseBody<>("OK",true,0,modules);} catch (Exception e) {e.printStackTrace();return new JsonResponseBody<>("初始化首页菜单错误",false,0,null);}}

2. ElementUI实现动态表格

2.1 表格的基本概念

表格是一种以行和列的形式组织数据的结构。在前端开发中，表格常用于展示和编辑大量的数据，提供了排序、筛选、分页等功能，方便用户对数据进行操作。

2.2 示例代码和效果展示

以下是使用ElementUI实现动态表格的示例代码：

<template><div class="books" style="padding: 20px;"><el-form :inline="true" class="demo-form-inline"><el-form-item label="书籍名称"><el-input v-model="bookname" placeholder="书籍名称"></el-input></el-form-item><el-form-item><el-button type="primary" @click="onSubmit">查询</el-button></el-form-item></el-form><el-table :data="tableData" stripe style="width: 100%"><el-table-column prop="id" label="书籍编号" width="180"></el-table-column><el-table-column prop="bookname" label="书籍名称" width="180"></el-table-column><el-table-column prop="price" label="书籍价格"></el-table-column><el-table-column prop="booktype" label="书籍类别"></el-table-column></el-table><div class="block"><span class="demonstration">完整功能</span><el-pagination@size-change="handleSizeChange"@current-change="handleCurrentChange":current-page="page":page-sizes="[10, 20, 30, 40]":page-size="rows"layout="total, sizes, prev, pager, next, jumper":total="total"></el-pagination></div></div>
</template><script>export default {data() {return {bookname: '',tableData: [],page:1,rows:10,total:0}},methods: {onSubmit() {let params = {bookname: this.bookname}this.query(params);},query(params) {let url = this.axios.urls.Book_List;this.axios.get(url, {params: params}).then(r => {this.tableData = r.data.rows;this.total = r.data.total}).catch(e => {})},handleSizeChange(ydx){let params = {bookname: this.bookname,rows:ydx,page:this.page}this.query(params);},handleCurrentChange(y){let params = {bookname: this.bookname,rows : this.rows,page : y}this.query(params);}},created() {let params = {bookname: this.bookname}this.query({});}}
</script><style>
</style>

• 后台方法映射

 @RequestMapping("/queryBookPager")@ResponseBodypublic JsonResponseBody<List<Book>> queryBookPager(Book book, HttpServletRequest req){try {PageBean pageBean=new PageBean();pageBean.setRequest(req);List<Book> books = bookService.queryBookPager(book, pageBean);return new JsonResponseBody<>("OK",true,pageBean.getTotal(),books);} catch (Exception e) {e.printStackTrace();return new JsonResponseBody<>("分页查询书本失败",false,0,null);}}

• 效果展示
  

总结

本文介绍了如何使用ElementUI实现动态树和动态表格的综合应用。通过Tree组件和Table组件，我们可以方便地展示和交互树形数据和表格数据。同时，通过动态加载数据的方式，我们可以实现树节点和表格数据的动态更新，提升用户体验。在实际项目中，可以根据具体需求进行进一步的定制和扩展，以满足项目的需求。